services/core/java/com/android/server/InputMethodManagerService.java

/*
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.android.server;

import static android.view.Display.DEFAULT_DISPLAY;
import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_SHOW_FOR_ALL_USERS;
import static android.view.WindowManager.LayoutParams.TYPE_INPUT_METHOD;
import static android.view.WindowManager.LayoutParams.TYPE_INPUT_METHOD_DIALOG;
import static java.lang.annotation.RetentionPolicy.SOURCE;

import com.android.internal.annotations.GuardedBy;
import com.android.internal.content.PackageMonitor;
import com.android.internal.inputmethod.IInputContentUriToken;
import com.android.internal.inputmethod.InputMethodSubtypeSwitchingController;
import com.android.internal.inputmethod.InputMethodSubtypeSwitchingController.ImeSubtypeListItem;
import com.android.internal.inputmethod.InputMethodUtils;
import com.android.internal.inputmethod.InputMethodUtils.InputMethodSettings;
import com.android.internal.os.HandlerCaller;
import com.android.internal.os.SomeArgs;
import com.android.internal.os.TransferPipe;
import com.android.internal.util.FastXmlSerializer;
import com.android.internal.view.IInputContext;
import com.android.internal.view.IInputMethod;
import com.android.internal.view.IInputMethodClient;
import com.android.internal.view.IInputMethodManager;
import com.android.internal.view.IInputMethodSession;
import com.android.internal.view.IInputSessionCallback;
import com.android.internal.view.InputBindResult;
import com.android.internal.view.InputMethodClient;
import com.android.server.statusbar.StatusBarManagerService;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlSerializer;

import android.annotation.IntDef;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.UserIdInt;
import android.app.ActivityManager;
import android.app.ActivityManagerInternal;
import android.app.AlertDialog;
import android.app.AppGlobals;
import android.app.AppOpsManager;
import android.app.KeyguardManager;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.ContentProvider;
import android.content.ContentResolver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnCancelListener;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.ServiceConnection;
import android.content.pm.ApplicationInfo;
import android.content.pm.IPackageManager;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.content.pm.ServiceInfo;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.database.ContentObserver;
import android.graphics.drawable.Drawable;
import android.hardware.input.InputManagerInternal;
import android.inputmethodservice.InputMethodService;
import android.net.Uri;
import android.os.Binder;
import android.os.Bundle;
import android.os.Debug;
import android.os.Environment;
import android.os.Handler;
import android.os.IBinder;
import android.os.IInterface;
import android.os.Message;
import android.os.LocaleList;
import android.os.Parcel;
import android.os.Process;
import android.os.RemoteException;
import android.os.ResultReceiver;
import android.os.ServiceManager;
import android.os.SystemClock;
import android.os.UserHandle;
import android.os.UserManager;
import android.provider.Settings;
import android.text.TextUtils;
import android.text.style.SuggestionSpan;
import android.util.ArrayMap;
import android.util.ArraySet;
import android.util.AtomicFile;
import android.util.EventLog;
import android.util.LruCache;
import android.util.Pair;
import android.util.PrintWriterPrinter;
import android.util.Printer;
import android.util.Slog;
import android.util.Xml;
import android.view.ContextThemeWrapper;
import android.view.IWindowManager;
import android.view.InputChannel;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.view.WindowManagerInternal;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputBinding;
import android.view.inputmethod.InputConnection;
import android.view.inputmethod.InputConnectionInspector;
import android.view.inputmethod.InputMethod;
import android.view.inputmethod.InputMethodInfo;
import android.view.inputmethod.InputMethodManager;
import android.view.inputmethod.InputMethodManagerInternal;
import android.view.inputmethod.InputMethodSubtype;
import android.view.inputmethod.InputMethodSubtype.InputMethodSubtypeBuilder;
import android.widget.ArrayAdapter;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.RadioButton;
import android.widget.Switch;
import android.widget.TextView;
import android.widget.Toast;

import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.lang.annotation.Retention;
import java.nio.charset.StandardCharsets;
import java.security.InvalidParameterException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.WeakHashMap;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * This class provides a system service that manages input methods.
 */
public class InputMethodManagerService extends IInputMethodManager.Stub
        implements ServiceConnection, Handler.Callback {
    static final boolean DEBUG = false;
    static final boolean DEBUG_RESTORE = DEBUG || false;
    static final String TAG = "InputMethodManagerService";

    static final int MSG_SHOW_IM_SUBTYPE_PICKER = 1;
    static final int MSG_SHOW_IM_SUBTYPE_ENABLER = 2;
    static final int MSG_SHOW_IM_CONFIG = 3;

    static final int MSG_UNBIND_INPUT = 1000;
    static final int MSG_BIND_INPUT = 1010;
    static final int MSG_SHOW_SOFT_INPUT = 1020;
    static final int MSG_HIDE_SOFT_INPUT = 1030;
    static final int MSG_HIDE_CURRENT_INPUT_METHOD = 1035;
    static final int MSG_ATTACH_TOKEN = 1040;
    static final int MSG_CREATE_SESSION = 1050;

    static final int MSG_START_INPUT = 2000;

    static final int MSG_UNBIND_CLIENT = 3000;
    static final int MSG_BIND_CLIENT = 3010;
    static final int MSG_SET_ACTIVE = 3020;
    static final int MSG_SET_INTERACTIVE = 3030;
    static final int MSG_SET_USER_ACTION_NOTIFICATION_SEQUENCE_NUMBER = 3040;
    static final int MSG_REPORT_FULLSCREEN_MODE = 3045;
    static final int MSG_SWITCH_IME = 3050;

    static final int MSG_HARD_KEYBOARD_SWITCH_CHANGED = 4000;

    static final int MSG_SYSTEM_UNLOCK_USER = 5000;

    static final long TIME_TO_RECONNECT = 3 * 1000;

    static final int SECURE_SUGGESTION_SPANS_MAX_SIZE = 20;

    private static final int NOT_A_SUBTYPE_ID = InputMethodUtils.NOT_A_SUBTYPE_ID;
    private static final String TAG_TRY_SUPPRESSING_IME_SWITCHER = "TrySuppressingImeSwitcher";

    @Retention(SOURCE)
    @IntDef({HardKeyboardBehavior.WIRELESS_AFFORDANCE, HardKeyboardBehavior.WIRED_AFFORDANCE})
    private @interface  HardKeyboardBehavior {
        int WIRELESS_AFFORDANCE = 0;
        int WIRED_AFFORDANCE = 1;
    }

    final Context mContext;
    final Resources mRes;
    final Handler mHandler;
    final InputMethodSettings mSettings;
    final SettingsObserver mSettingsObserver;
    final IWindowManager mIWindowManager;
    final WindowManagerInternal mWindowManagerInternal;
    final HandlerCaller mCaller;
    final boolean mHasFeature;
    private InputMethodFileManager mFileManager;
    private final HardKeyboardListener mHardKeyboardListener;
    private final AppOpsManager mAppOpsManager;
    private final UserManager mUserManager;

    final InputBindResult mNoBinding = new InputBindResult(null, null, null, -1, -1);

    // All known input methods.  mMethodMap also serves as the global
    // lock for this class.
    final ArrayList<InputMethodInfo> mMethodList = new ArrayList<>();
    final HashMap<String, InputMethodInfo> mMethodMap = new HashMap<>();
    private final LruCache<SuggestionSpan, InputMethodInfo> mSecureSuggestionSpans =
            new LruCache<>(SECURE_SUGGESTION_SPANS_MAX_SIZE);
    private final InputMethodSubtypeSwitchingController mSwitchingController;

    /**
     * Tracks how many times {@link #mMethodMap} was updated.
     */
    @GuardedBy("mMethodMap")
    private int mMethodMapUpdateCount = 0;

    // Used to bring IME service up to visible adjustment while it is being shown.
    final ServiceConnection mVisibleConnection = new ServiceConnection() {
        @Override public void onServiceConnected(ComponentName name, IBinder service) {
        }

        @Override public void onServiceDisconnected(ComponentName name) {
        }
    };
    boolean mVisibleBound = false;

    // Ongoing notification
    private NotificationManager mNotificationManager;
    private KeyguardManager mKeyguardManager;
    private @Nullable StatusBarManagerService mStatusBar;
    private Notification.Builder mImeSwitcherNotification;
    private PendingIntent mImeSwitchPendingIntent;
    private boolean mShowOngoingImeSwitcherForPhones;
    private boolean mNotificationShown;

    static class SessionState {
        final ClientState client;
        final IInputMethod method;

        IInputMethodSession session;
        InputChannel channel;

        @Override
        public String toString() {
            return "SessionState{uid " + client.uid + " pid " + client.pid
                    + " method " + Integer.toHexString(
                            System.identityHashCode(method))
                    + " session " + Integer.toHexString(
                            System.identityHashCode(session))
                    + " channel " + channel
                    + "}";
        }

        SessionState(ClientState _client, IInputMethod _method,
                IInputMethodSession _session, InputChannel _channel) {
            client = _client;
            method = _method;
            session = _session;
            channel = _channel;
        }
    }

    static final class ClientState {
        final IInputMethodClient client;
        final IInputContext inputContext;
        final int uid;
        final int pid;
        final InputBinding binding;

        boolean sessionRequested;
        SessionState curSession;

        @Override
        public String toString() {
            return "ClientState{" + Integer.toHexString(
                    System.identityHashCode(this)) + " uid " + uid
                    + " pid " + pid + "}";
        }

        ClientState(IInputMethodClient _client, IInputContext _inputContext,
                int _uid, int _pid) {
            client = _client;
            inputContext = _inputContext;
            uid = _uid;
            pid = _pid;
            binding = new InputBinding(null, inputContext.asBinder(), uid, pid);
        }
    }

    final HashMap<IBinder, ClientState> mClients = new HashMap<>();

    /**
     * Set once the system is ready to run third party code.
     */
    boolean mSystemReady;

    /**
     * Id obtained with {@link InputMethodInfo#getId()} for the currently selected input method.
     * method.  This is to be synchronized with the secure settings keyed with
     * {@link Settings.Secure#DEFAULT_INPUT_METHOD}.
     *
     * <p>This can be transiently {@code null} when the system is re-initializing input method
     * settings, e.g., the system locale is just changed.</p>
     *
     * <p>Note that {@link #mCurId} is used to track which IME is being connected to
     * {@link InputMethodManagerService}.</p>
     *
     * @see #mCurId
     */
    @Nullable
    String mCurMethodId;

    /**
     * The current binding sequence number, incremented every time there is
     * a new bind performed.
     */
    int mCurSeq;

    /**
     * The client that is currently bound to an input method.
     */
    ClientState mCurClient;

    /**
     * The last window token that we confirmed to be focused.  This is always updated upon reports
     * from the input method client.  If the window state is already changed before the report is
     * handled, this field just keeps the last value.
     */
    IBinder mCurFocusedWindow;

    /**
     * {@link WindowManager.LayoutParams#softInputMode} of {@link #mCurFocusedWindow}.
     *
     * @see #mCurFocusedWindow
     */
    int mCurFocusedWindowSoftInputMode;

    /**
     * The client by which {@link #mCurFocusedWindow} was reported.  Used only for debugging.
     */
    ClientState mCurFocusedWindowClient;

    /**
     * The input context last provided by the current client.
     */
    IInputContext mCurInputContext;

    /**
     * The missing method flags for the input context last provided by the current client.
     *
     * @see android.view.inputmethod.InputConnectionInspector.MissingMethodFlags
     */
    int mCurInputContextMissingMethods;

    /**
     * The attributes last provided by the current client.
     */
    EditorInfo mCurAttribute;

    /**
     * Id obtained with {@link InputMethodInfo#getId()} for the input method that we are currently
     * connected to or in the process of connecting to.
     *
     * <p>This can be {@code null} when no input method is connected.</p>
     *
     * @see #mCurMethodId
     */
    @Nullable
    String mCurId;

    /**
     * The current subtype of the current input method.
     */
    private InputMethodSubtype mCurrentSubtype;

    // This list contains the pairs of InputMethodInfo and InputMethodSubtype.
    private final HashMap<InputMethodInfo, ArrayList<InputMethodSubtype>>
            mShortcutInputMethodsAndSubtypes = new HashMap<>();

    // Was the keyguard locked when this client became current?
    private boolean mCurClientInKeyguard;

    /**
     * Set to true if our ServiceConnection is currently actively bound to
     * a service (whether or not we have gotten its IBinder back yet).
     */
    boolean mHaveConnection;

    /**
     * Set if the client has asked for the input method to be shown.
     */
    boolean mShowRequested;

    /**
     * Set if we were explicitly told to show the input method.
     */
    boolean mShowExplicitlyRequested;

    /**
     * Set if we were forced to be shown.
     */
    boolean mShowForced;

    /**
     * Set if we last told the input method to show itself.
     */
    boolean mInputShown;

    /**
     * {@code true} if the current input method is in fullscreen mode.
     */
    boolean mInFullscreenMode;

    /**
     * The Intent used to connect to the current input method.
     */
    Intent mCurIntent;

    /**
     * The token we have made for the currently active input method, to
     * identify it in the future.
     */
    IBinder mCurToken;

    /**
     * If non-null, this is the input method service we are currently connected
     * to.
     */
    IInputMethod mCurMethod;

    /**
     * Time that we last initiated a bind to the input method, to determine
     * if we should try to disconnect and reconnect to it.
     */
    long mLastBindTime;

    /**
     * Have we called mCurMethod.bindInput()?
     */
    boolean mBoundToMethod;

    /**
     * Currently enabled session.  Only touched by service thread, not
     * protected by a lock.
     */
    SessionState mEnabledSession;

    /**
     * True if the device is currently interactive with user.  The value is true initially.
     */
    boolean mIsInteractive = true;

    int mCurUserActionNotificationSequenceNumber = 0;

    int mBackDisposition = InputMethodService.BACK_DISPOSITION_DEFAULT;

    /**
     * A set of status bits regarding the active IME.
     *
     * <p>This value is a combination of following two bits:</p>
     * <dl>
     * <dt>{@link InputMethodService#IME_ACTIVE}</dt>
     * <dd>
     *   If this bit is ON, connected IME is ready to accept touch/key events.
     * </dd>
     * <dt>{@link InputMethodService#IME_VISIBLE}</dt>
     * <dd>
     *   If this bit is ON, some of IME view, e.g. software input, candidate view, is visible.
     * </dd>
     * </dl>
     * <em>Do not update this value outside of setImeWindowStatus.</em>
     */
    int mImeWindowVis;

    private AlertDialog.Builder mDialogBuilder;
    private AlertDialog mSwitchingDialog;
    private IBinder mSwitchingDialogToken = new Binder();
    private View mSwitchingDialogTitleView;
    private Toast mSubtypeSwitchedByShortCutToast;
    private InputMethodInfo[] mIms;
    private int[] mSubtypeIds;
    private LocaleList mLastSystemLocales;
    private boolean mShowImeWithHardKeyboard;
    private boolean mAccessibilityRequestingNoSoftKeyboard;
    private final MyPackageMonitor mMyPackageMonitor = new MyPackageMonitor();
    private final IPackageManager mIPackageManager;
    private final String mSlotIme;
    @HardKeyboardBehavior
    private final int mHardKeyboardBehavior;

    /**
     * Internal state snapshot when {@link #MSG_START_INPUT} message is about to be posted to the
     * internal message queue. Any subsequent state change inside {@link InputMethodManagerService}
     * will not affect those tasks that are already posted.
     *
     * <p>Posting {@link #MSG_START_INPUT} message basically means that
     * {@link InputMethodService#doStartInput(InputConnection, EditorInfo, boolean)} will be called
     * back in the current IME process shortly, which will also affect what the current IME starts
     * receiving from {@link InputMethodService#getCurrentInputConnection()}. In other words, this
     * snapshot will be taken every time when {@link InputMethodManagerService} is initiating a new
     * logical input session between the client application and the current IME.</p>
     *
     * <p>Be careful to not keep strong references to this object forever, which can prevent
     * {@link StartInputInfo#mImeToken} and {@link StartInputInfo#mTargetWindow} from being GC-ed.
     * </p>
     */
    private static class StartInputInfo {
        private static final AtomicInteger sSequenceNumber = new AtomicInteger(0);

        final int mSequenceNumber;
        final long mTimestamp;
        final long mWallTime;
        @NonNull
        final IBinder mImeToken;
        @NonNull
        final String mImeId;
        // @InputMethodClient.StartInputReason
        final int mStartInputReason;
        final boolean mRestarting;
        @Nullable
        final IBinder mTargetWindow;
        @NonNull
        final EditorInfo mEditorInfo;
        final int mTargetWindowSoftInputMode;
        final int mClientBindSequenceNumber;

        StartInputInfo(@NonNull IBinder imeToken, @NonNull String imeId,
                /* @InputMethodClient.StartInputReason */ int startInputReason, boolean restarting,
                @Nullable IBinder targetWindow, @NonNull EditorInfo editorInfo,
                int targetWindowSoftInputMode, int clientBindSequenceNumber) {
            mSequenceNumber = sSequenceNumber.getAndIncrement();
            mTimestamp = SystemClock.uptimeMillis();
            mWallTime = System.currentTimeMillis();
            mImeToken = imeToken;
            mImeId = imeId;
            mStartInputReason = startInputReason;
            mRestarting = restarting;
            mTargetWindow = targetWindow;
            mEditorInfo = editorInfo;
            mTargetWindowSoftInputMode = targetWindowSoftInputMode;
            mClientBindSequenceNumber = clientBindSequenceNumber;
        }
    }

    @GuardedBy("mMethodMap")
    private final WeakHashMap<IBinder, StartInputInfo> mStartInputMap = new WeakHashMap<>();

    /**
     * A ring buffer to store the history of {@link StartInputInfo}.
     */
    private static final class StartInputHistory {
        /**
         * Entry size for non low-RAM devices.
         *
         * <p>TODO: Consider to follow what other system services have been doing to manage
         * constants (e.g. {@link android.provider.Settings.Global#ACTIVITY_MANAGER_CONSTANTS}).</p>
         */
        private final static int ENTRY_SIZE_FOR_HIGH_RAM_DEVICE = 16;

        /**
         * Entry size for non low-RAM devices.
         *
         * <p>TODO: Consider to follow what other system services have been doing to manage
         * constants (e.g. {@link android.provider.Settings.Global#ACTIVITY_MANAGER_CONSTANTS}).</p>
         */
        private final static int ENTRY_SIZE_FOR_LOW_RAM_DEVICE = 5;

        private static int getEntrySize() {
            if (ActivityManager.isLowRamDeviceStatic()) {
                return ENTRY_SIZE_FOR_LOW_RAM_DEVICE;
            } else {
                return ENTRY_SIZE_FOR_HIGH_RAM_DEVICE;
            }
        }

        /**
         * Backing store for the ring bugger.
         */
        private final Entry[] mEntries = new Entry[getEntrySize()];

        /**
         * An index of {@link #mEntries}, to which next {@link #addEntry(StartInputInfo)} should
         * write.
         */
        private int mNextIndex = 0;

        /**
         * Recyclable entry to store the information in {@link StartInputInfo}.
         */
        private static final class Entry {
            int mSequenceNumber;
            long mTimestamp;
            long mWallTime;
            @NonNull
            String mImeTokenString;
            @NonNull
            String mImeId;
            /* @InputMethodClient.StartInputReason */
            int mStartInputReason;
            boolean mRestarting;
            @NonNull
            String mTargetWindowString;
            @NonNull
            EditorInfo mEditorInfo;
            int mTargetWindowSoftInputMode;
            int mClientBindSequenceNumber;

            Entry(@NonNull StartInputInfo original) {
                set(original);
            }

            void set(@NonNull StartInputInfo original) {
                mSequenceNumber = original.mSequenceNumber;
                mTimestamp = original.mTimestamp;
                mWallTime = original.mWallTime;
                // Intentionally convert to String so as not to keep a strong reference to a Binder
                // object.
                mImeTokenString = String.valueOf(original.mImeToken);
                mImeId = original.mImeId;
                mStartInputReason = original.mStartInputReason;
                mRestarting = original.mRestarting;
                // Intentionally convert to String so as not to keep a strong reference to a Binder
                // object.
                mTargetWindowString = String.valueOf(original.mTargetWindow);
                mEditorInfo = original.mEditorInfo;
                mTargetWindowSoftInputMode = original.mTargetWindowSoftInputMode;
                mClientBindSequenceNumber = original.mClientBindSequenceNumber;
            }
        }

        /**
         * Add a new entry and discard the oldest entry as needed.
         * @param info {@lin StartInputInfo} to be added.
         */
        void addEntry(@NonNull StartInputInfo info) {
            final int index = mNextIndex;
            if (mEntries[index] == null) {
                mEntries[index] = new Entry(info);
            } else {
                mEntries[index].set(info);
            }
            mNextIndex = (mNextIndex + 1) % mEntries.length;
        }

        void dump(@NonNull PrintWriter pw, @NonNull String prefix) {
            final SimpleDateFormat dataFormat =
                    new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS", Locale.US);

            for (int i = 0; i < mEntries.length; ++i) {
                final Entry entry = mEntries[(i + mNextIndex) % mEntries.length];
                if (entry == null) {
                    continue;
                }
                pw.print(prefix);
                pw.println("StartInput #" + entry.mSequenceNumber + ":");

                pw.print(prefix);
                pw.println(" time=" + dataFormat.format(new Date(entry.mWallTime))
                        + " (timestamp=" + entry.mTimestamp + ")"
                        + " reason="
                        + InputMethodClient.getStartInputReason(entry.mStartInputReason)
                        + " restarting=" + entry.mRestarting);

                pw.print(prefix);
                pw.println(" imeToken=" + entry.mImeTokenString + " [" + entry.mImeId + "]");

                pw.print(prefix);
                pw.println(" targetWin=" + entry.mTargetWindowString
                        + " [" + entry.mEditorInfo.packageName + "]"
                        + " clientBindSeq=" + entry.mClientBindSequenceNumber);

                pw.print(prefix);
                pw.println(" softInputMode=" + InputMethodClient.softInputModeToString(
                                entry.mTargetWindowSoftInputMode));

                pw.print(prefix);
                pw.println(" inputType=0x" + Integer.toHexString(entry.mEditorInfo.inputType)
                        + " imeOptions=0x" + Integer.toHexString(entry.mEditorInfo.imeOptions)
                        + " fieldId=0x" + Integer.toHexString(entry.mEditorInfo.fieldId)
                        + " fieldName=" + entry.mEditorInfo.fieldName
                        + " actionId=" + entry.mEditorInfo.actionId
                        + " actionLabel=" + entry.mEditorInfo.actionLabel);
            }
        }
    }

    @GuardedBy("mMethodMap")
    @NonNull
    private final StartInputHistory mStartInputHistory = new StartInputHistory();

    class SettingsObserver extends ContentObserver {
        int mUserId;
        boolean mRegistered = false;
        @NonNull
        String mLastEnabled = "";

        /**
         * <em>This constructor must be called within the lock.</em>
         */
        SettingsObserver(Handler handler) {
            super(handler);
        }

        public void registerContentObserverLocked(@UserIdInt int userId) {
            if (mRegistered && mUserId == userId) {
                return;
            }
            ContentResolver resolver = mContext.getContentResolver();
            if (mRegistered) {
                mContext.getContentResolver().unregisterContentObserver(this);
                mRegistered = false;
            }
            if (mUserId != userId) {
                mLastEnabled = "";
                mUserId = userId;
            }
            resolver.registerContentObserver(Settings.Secure.getUriFor(
                    Settings.Secure.DEFAULT_INPUT_METHOD), false, this, userId);
            resolver.registerContentObserver(Settings.Secure.getUriFor(
                    Settings.Secure.ENABLED_INPUT_METHODS), false, this, userId);
            resolver.registerContentObserver(Settings.Secure.getUriFor(
                    Settings.Secure.SELECTED_INPUT_METHOD_SUBTYPE), false, this, userId);
            resolver.registerContentObserver(Settings.Secure.getUriFor(
                    Settings.Secure.SHOW_IME_WITH_HARD_KEYBOARD), false, this, userId);
            resolver.registerContentObserver(Settings.Secure.getUriFor(
                    Settings.Secure.ACCESSIBILITY_SOFT_KEYBOARD_MODE), false, this, userId);
            mRegistered = true;
        }

        @Override public void onChange(boolean selfChange, Uri uri) {
            final Uri showImeUri = Settings.Secure.getUriFor(
                    Settings.Secure.SHOW_IME_WITH_HARD_KEYBOARD);
            final Uri accessibilityRequestingNoImeUri = Settings.Secure.getUriFor(
                    Settings.Secure.ACCESSIBILITY_SOFT_KEYBOARD_MODE);
            synchronized (mMethodMap) {
                if (showImeUri.equals(uri)) {
                    updateKeyboardFromSettingsLocked();
                } else if (accessibilityRequestingNoImeUri.equals(uri)) {
                    mAccessibilityRequestingNoSoftKeyboard = Settings.Secure.getIntForUser(
                            mContext.getContentResolver(),
                            Settings.Secure.ACCESSIBILITY_SOFT_KEYBOARD_MODE,
                            0, mUserId) == 1;
                    if (mAccessibilityRequestingNoSoftKeyboard) {
                        final boolean showRequested = mShowRequested;
                        hideCurrentInputLocked(0, null);
                        mShowRequested = showRequested;
                    } else if (mShowRequested) {
                        showCurrentInputLocked(InputMethodManager.SHOW_IMPLICIT, null);
                    }
                } else {
                    boolean enabledChanged = false;
                    String newEnabled = mSettings.getEnabledInputMethodsStr();
                    if (!mLastEnabled.equals(newEnabled)) {
                        mLastEnabled = newEnabled;
                        enabledChanged = true;
                    }
                    updateInputMethodsFromSettingsLocked(enabledChanged);
                }
            }
        }

        @Override
        public String toString() {
            return "SettingsObserver{mUserId=" + mUserId + " mRegistered=" + mRegistered
                    + " mLastEnabled=" + mLastEnabled + "}";
        }
    }

    class ImmsBroadcastReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            final String action = intent.getAction();
            if (Intent.ACTION_CLOSE_SYSTEM_DIALOGS.equals(action)) {
                hideInputMethodMenu();
                // No need to update mIsInteractive
                return;
            } else if (Intent.ACTION_USER_ADDED.equals(action)
                    || Intent.ACTION_USER_REMOVED.equals(action)) {
                updateCurrentProfileIds();
                return;
            } else if (Intent.ACTION_SETTING_RESTORED.equals(action)) {
                final String name = intent.getStringExtra(Intent.EXTRA_SETTING_NAME);
                if (Settings.Secure.ENABLED_INPUT_METHODS.equals(name)) {
                    final String prevValue = intent.getStringExtra(
                            Intent.EXTRA_SETTING_PREVIOUS_VALUE);
                    final String newValue = intent.getStringExtra(
                            Intent.EXTRA_SETTING_NEW_VALUE);
                    restoreEnabledInputMethods(mContext, prevValue, newValue);
                }
            } else if (Intent.ACTION_LOCALE_CHANGED.equals(action)) {
                onActionLocaleChanged();
            } else {
                Slog.w(TAG, "Unexpected intent " + intent);
            }
        }
    }

    /**
     * Handles {@link Intent#ACTION_LOCALE_CHANGED}.
     *
     * <p>Note: For historical reasons, {@link Intent#ACTION_LOCALE_CHANGED} has been sent to all
     * the users. We should ignore this event if this is about any background user's locale.</p>
     *
     * <p>Caution: This method must not be called when system is not ready.</p>
     */
    void onActionLocaleChanged() {
        synchronized (mMethodMap) {
            final LocaleList possibleNewLocale = mRes.getConfiguration().getLocales();
            if (possibleNewLocale != null && possibleNewLocale.equals(mLastSystemLocales)) {
                return;
            }
            buildInputMethodListLocked(true);
            // If the locale is changed, needs to reset the default ime
            resetDefaultImeLocked(mContext);
            updateFromSettingsLocked(true);
            mLastSystemLocales = possibleNewLocale;
        }
    }

    // Apply the results of a restore operation to the set of enabled IMEs.  Note that this
    // does not attempt to validate on the fly with any installed device policy, so must only
    // be run in the context of initial device setup.
    //
    // TODO: Move this method to InputMethodUtils with adding unit tests.
    static void restoreEnabledInputMethods(Context context, String prevValue, String newValue) {
        if (DEBUG_RESTORE) {
            Slog.i(TAG, "Restoring enabled input methods:");
            Slog.i(TAG, "prev=" + prevValue);
            Slog.i(TAG, " new=" + newValue);
        }
        // 'new' is the just-restored state, 'prev' is what was in settings prior to the restore
        ArrayMap<String, ArraySet<String>> prevMap =
                InputMethodUtils.parseInputMethodsAndSubtypesString(prevValue);
        ArrayMap<String, ArraySet<String>> newMap =
                InputMethodUtils.parseInputMethodsAndSubtypesString(newValue);

        // Merge the restored ime+subtype enabled states into the live state
        for (ArrayMap.Entry<String, ArraySet<String>> entry : newMap.entrySet()) {
            final String imeId = entry.getKey();
            ArraySet<String> prevSubtypes = prevMap.get(imeId);
            if (prevSubtypes == null) {
                prevSubtypes = new ArraySet<>(2);
                prevMap.put(imeId, prevSubtypes);
            }
            prevSubtypes.addAll(entry.getValue());
        }

        final String mergedImesAndSubtypesString =
                InputMethodUtils.buildInputMethodsAndSubtypesString(prevMap);
        if (DEBUG_RESTORE) {
            Slog.i(TAG, "Merged IME string:");
            Slog.i(TAG, "     " + mergedImesAndSubtypesString);
        }
        Settings.Secure.putString(context.getContentResolver(),
                Settings.Secure.ENABLED_INPUT_METHODS, mergedImesAndSubtypesString);
    }

    final class MyPackageMonitor extends PackageMonitor {
        /**
         * Set of packages to be monitored.
         *
         * <p>No need to include packages because of direct-boot unaware IMEs since we always rescan
         * all the packages when the user is unlocked, and direct-boot awareness will not be changed
         * dynamically unless the entire package is updated, which also always triggers package
         * rescanning.</p>
         */
        @GuardedBy("mMethodMap")
        private ArraySet<String> mPackagesToMonitorComponentChange = new ArraySet<>();

        @GuardedBy("mMethodMap")
        void clearPackagesToMonitorComponentChangeLocked() {
            mPackagesToMonitorComponentChange.clear();
        }

        @GuardedBy("mMethodMap")
        final void addPackageToMonitorComponentChangeLocked(@NonNull String packageName) {
            mPackagesToMonitorComponentChange.add(packageName);
        }

        private boolean isChangingPackagesOfCurrentUser() {
            final int userId = getChangingUserId();
            final boolean retval = userId == mSettings.getCurrentUserId();
            if (DEBUG) {
                if (!retval) {
                    Slog.d(TAG, "--- ignore this call back from a background user: " + userId);
                }
            }
            return retval;
        }

        @Override
        public boolean onHandleForceStop(Intent intent, String[] packages, int uid, boolean doit) {
            if (!isChangingPackagesOfCurrentUser()) {
                return false;
            }
            synchronized (mMethodMap) {
                String curInputMethodId = mSettings.getSelectedInputMethod();
                final int N = mMethodList.size();
                if (curInputMethodId != null) {
                    for (int i=0; i<N; i++) {
                        InputMethodInfo imi = mMethodList.get(i);
                        if (imi.getId().equals(curInputMethodId)) {
                            for (String pkg : packages) {
                                if (imi.getPackageName().equals(pkg)) {
                                    if (!doit) {
                                        return true;
                                    }
                                    resetSelectedInputMethodAndSubtypeLocked("");
                                    chooseNewDefaultIMELocked();
                                    return true;
                                }
                            }
                        }
                    }
                }
            }
            return false;
        }

        @Override
        public boolean onPackageChanged(String packageName, int uid, String[] components) {
            // If this package is in the watch list, we want to check it.
            synchronized (mMethodMap) {
                return mPackagesToMonitorComponentChange.contains(packageName);
            }
        }

        @Override
        public void onSomePackagesChanged() {
            if (!isChangingPackagesOfCurrentUser()) {
                return;
            }
            synchronized (mMethodMap) {
                InputMethodInfo curIm = null;
                String curInputMethodId = mSettings.getSelectedInputMethod();
                final int N = mMethodList.size();
                if (curInputMethodId != null) {
                    for (int i=0; i<N; i++) {
                        InputMethodInfo imi = mMethodList.get(i);
                        final String imiId = imi.getId();
                        if (imiId.equals(curInputMethodId)) {
                            curIm = imi;
                        }

                        int change = isPackageDisappearing(imi.getPackageName());
                        if (isPackageModified(imi.getPackageName())) {
                            mFileManager.deleteAllInputMethodSubtypes(imiId);
                        }
                        if (change == PACKAGE_TEMPORARY_CHANGE
                                || change == PACKAGE_PERMANENT_CHANGE) {
                            Slog.i(TAG, "Input method uninstalled, disabling: "
                                    + imi.getComponent());
                            setInputMethodEnabledLocked(imi.getId(), false);
                        }
                    }
                }

                buildInputMethodListLocked(false /* resetDefaultEnabledIme */);

                boolean changed = false;

                if (curIm != null) {
                    int change = isPackageDisappearing(curIm.getPackageName());
                    if (change == PACKAGE_TEMPORARY_CHANGE
                            || change == PACKAGE_PERMANENT_CHANGE) {
                        ServiceInfo si = null;
                        try {
                            si = mIPackageManager.getServiceInfo(
                                    curIm.getComponent(), 0, mSettings.getCurrentUserId());
                        } catch (RemoteException ex) {
                        }
                        if (si == null) {
                            // Uh oh, current input method is no longer around!
                            // Pick another one...
                            Slog.i(TAG, "Current input method removed: " + curInputMethodId);
                            updateSystemUiLocked(mCurToken, 0 /* vis */, mBackDisposition);
                            if (!chooseNewDefaultIMELocked()) {
                                changed = true;
                                curIm = null;
                                Slog.i(TAG, "Unsetting current input method");
                                resetSelectedInputMethodAndSubtypeLocked("");
                            }
                        }
                    }
                }

                if (curIm == null) {
                    // We currently don't have a default input method... is
                    // one now available?
                    changed = chooseNewDefaultIMELocked();
                } else if (!changed && isPackageModified(curIm.getPackageName())) {
                    // Even if the current input method is still available, mCurrentSubtype could
                    // be obsolete when the package is modified in practice.
                    changed = true;
                }

                if (changed) {
                    updateFromSettingsLocked(false);
                }
            }
        }
    }

    private static final class MethodCallback extends IInputSessionCallback.Stub {
        private final InputMethodManagerService mParentIMMS;
        private final IInputMethod mMethod;
        private final InputChannel mChannel;

        MethodCallback(InputMethodManagerService imms, IInputMethod method,
                InputChannel channel) {
            mParentIMMS = imms;
            mMethod = method;
            mChannel = channel;
        }

        @Override
        public void sessionCreated(IInputMethodSession session) {
            long ident = Binder.clearCallingIdentity();
            try {
                mParentIMMS.onSessionCreated(mMethod, session, mChannel);
            } finally {
                Binder.restoreCallingIdentity(ident);
            }
        }
    }

    private class HardKeyboardListener
            implements WindowManagerInternal.OnHardKeyboardStatusChangeListener {
        @Override
        public void onHardKeyboardStatusChange(boolean available) {
            mHandler.sendMessage(mHandler.obtainMessage(MSG_HARD_KEYBOARD_SWITCH_CHANGED,
                        available ? 1 : 0));
        }

        public void handleHardKeyboardStatusChange(boolean available) {
            if (DEBUG) {
                Slog.w(TAG, "HardKeyboardStatusChanged: available=" + available);
            }
            synchronized(mMethodMap) {
                if (mSwitchingDialog != null && mSwitchingDialogTitleView != null
                        && mSwitchingDialog.isShowing()) {
                    mSwitchingDialogTitleView.findViewById(
                            com.android.internal.R.id.hard_keyboard_section).setVisibility(
                                    available ? View.VISIBLE : View.GONE);
                }
            }
        }
    }

    public static final class Lifecycle extends SystemService {
        private InputMethodManagerService mService;

        public Lifecycle(Context context) {
            super(context);
            mService = new InputMethodManagerService(context);
        }

        @Override
        public void onStart() {
            LocalServices.addService(InputMethodManagerInternal.class,
                    new LocalServiceImpl(mService.mHandler));
            publishBinderService(Context.INPUT_METHOD_SERVICE, mService);
        }

        @Override
        public void onSwitchUser(@UserIdInt int userHandle) {
            // Called on ActivityManager thread.
            // TODO: Dispatch this to a worker thread as needed.
            mService.onSwitchUser(userHandle);
        }

        @Override
        public void onBootPhase(int phase) {
            // Called on ActivityManager thread.
            // TODO: Dispatch this to a worker thread as needed.
            if (phase == SystemService.PHASE_ACTIVITY_MANAGER_READY) {
                StatusBarManagerService statusBarService = (StatusBarManagerService) ServiceManager
                        .getService(Context.STATUS_BAR_SERVICE);
                mService.systemRunning(statusBarService);
            }
        }

        @Override
        public void onUnlockUser(final @UserIdInt int userHandle) {
            // Called on ActivityManager thread.
            mService.mHandler.sendMessage(mService.mHandler.obtainMessage(MSG_SYSTEM_UNLOCK_USER,
                    userHandle /* arg1 */, 0 /* arg2 */));
        }
    }

    void onUnlockUser(@UserIdInt int userId) {
        synchronized(mMethodMap) {
            final int currentUserId = mSettings.getCurrentUserId();
            if (DEBUG) {
                Slog.d(TAG, "onUnlockUser: userId=" + userId + " curUserId=" + currentUserId);
            }
            if (userId != currentUserId) {
                return;
            }
            mSettings.switchCurrentUser(currentUserId, !mSystemReady);
            if (mSystemReady) {
                // We need to rebuild IMEs.
                buildInputMethodListLocked(false /* resetDefaultEnabledIme */);
                updateInputMethodsFromSettingsLocked(true /* enabledChanged */);
            }
        }
    }

    void onSwitchUser(@UserIdInt int userId) {
        synchronized (mMethodMap) {
            switchUserLocked(userId);
        }
    }

    public InputMethodManagerService(Context context) {
        mIPackageManager = AppGlobals.getPackageManager();
        mContext = context;
        mRes = context.getResources();
        mHandler = new Handler(this);
        // Note: SettingsObserver doesn't register observers in its constructor.
        mSettingsObserver = new SettingsObserver(mHandler);
        mIWindowManager = IWindowManager.Stub.asInterface(
                ServiceManager.getService(Context.WINDOW_SERVICE));
        mWindowManagerInternal = LocalServices.getService(WindowManagerInternal.class);
        mCaller = new HandlerCaller(context, null, new HandlerCaller.Callback() {
            @Override
            public void executeMessage(Message msg) {
                handleMessage(msg);
            }
        }, true /*asyncHandler*/);
        mAppOpsManager = mContext.getSystemService(AppOpsManager.class);
        mUserManager = mContext.getSystemService(UserManager.class);
        mHardKeyboardListener = new HardKeyboardListener();
        mHasFeature = context.getPackageManager().hasSystemFeature(
                PackageManager.FEATURE_INPUT_METHODS);
        mSlotIme = mContext.getString(com.android.internal.R.string.status_bar_ime);
        mHardKeyboardBehavior = mContext.getResources().getInteger(
                com.android.internal.R.integer.config_externalHardKeyboardBehavior);

        Bundle extras = new Bundle();
        extras.putBoolean(Notification.EXTRA_ALLOW_DURING_SETUP, true);
        mImeSwitcherNotification = new Notification.Builder(mContext)
            .setSmallIcon(com.android.internal.R.drawable.ic_notification_ime_default)
            .setWhen(0)
            .setOngoing(true)
            .addExtras(extras)
            .setCategory(Notification.CATEGORY_SYSTEM)
            .setColor(com.android.internal.R.color.system_notification_accent_color);

        Intent intent = new Intent(Settings.ACTION_SHOW_INPUT_METHOD_PICKER);
        mImeSwitchPendingIntent = PendingIntent.getBroadcast(mContext, 0, intent, 0);

        mShowOngoingImeSwitcherForPhones = false;

        mNotificationShown = false;
        int userId = 0;
        try {
            userId = ActivityManager.getService().getCurrentUser().id;
        } catch (RemoteException e) {
            Slog.w(TAG, "Couldn't get current user ID; guessing it's 0", e);
        }

        // mSettings should be created before buildInputMethodListLocked
        mSettings = new InputMethodSettings(
                mRes, context.getContentResolver(), mMethodMap, mMethodList, userId, !mSystemReady);

        updateCurrentProfileIds();
        mFileManager = new InputMethodFileManager(mMethodMap, userId);
        mSwitchingController = InputMethodSubtypeSwitchingController.createInstanceLocked(
                mSettings, context);
    }

    private void resetDefaultImeLocked(Context context) {
        // Do not reset the default (current) IME when it is a 3rd-party IME
        if (mCurMethodId != null && !InputMethodUtils.isSystemIme(mMethodMap.get(mCurMethodId))) {
            return;
        }
        final List<InputMethodInfo> suitableImes = InputMethodUtils.getDefaultEnabledImes(
                context, mSettings.getEnabledInputMethodListLocked());
        if (suitableImes.isEmpty()) {
            Slog.i(TAG, "No default found");
            return;
        }
        final InputMethodInfo defIm = suitableImes.get(0);
        if (DEBUG) {
            Slog.i(TAG, "Default found, using " + defIm.getId());
        }
        setSelectedInputMethodAndSubtypeLocked(defIm, NOT_A_SUBTYPE_ID, false);
    }

    private void switchUserLocked(int newUserId) {
        if (DEBUG) Slog.d(TAG, "Switching user stage 1/3. newUserId=" + newUserId
                + " currentUserId=" + mSettings.getCurrentUserId());

        // ContentObserver should be registered again when the user is changed
        mSettingsObserver.registerContentObserverLocked(newUserId);

        // If the system is not ready or the device is not yed unlocked by the user, then we use
        // copy-on-write settings.
        final boolean useCopyOnWriteSettings =
                !mSystemReady || !mUserManager.isUserUnlockingOrUnlocked(newUserId);
        mSettings.switchCurrentUser(newUserId, useCopyOnWriteSettings);
        updateCurrentProfileIds();
        // InputMethodFileManager should be reset when the user is changed
        mFileManager = new InputMethodFileManager(mMethodMap, newUserId);
        final String defaultImiId = mSettings.getSelectedInputMethod();

        if (DEBUG) Slog.d(TAG, "Switching user stage 2/3. newUserId=" + newUserId
                + " defaultImiId=" + defaultImiId);

        // For secondary users, the list of enabled IMEs may not have been updated since the
        // callbacks to PackageMonitor are ignored for the secondary user. Here, defaultImiId may
        // not be empty even if the IME has been uninstalled by the primary user.
        // Even in such cases, IMMS works fine because it will find the most applicable
        // IME for that user.
        final boolean initialUserSwitch = TextUtils.isEmpty(defaultImiId);
        mLastSystemLocales = mRes.getConfiguration().getLocales();

        // TODO: Is it really possible that switchUserLocked() happens before system ready?
        if (mSystemReady) {
            hideCurrentInputLocked(0, null);
            resetCurrentMethodAndClient(InputMethodClient.UNBIND_REASON_SWITCH_USER);
            buildInputMethodListLocked(initialUserSwitch);
            if (TextUtils.isEmpty(mSettings.getSelectedInputMethod())) {
                // This is the first time of the user switch and
                // set the current ime to the proper one.
                resetDefaultImeLocked(mContext);
            }
            updateFromSettingsLocked(true);
            try {
                startInputInnerLocked();
            } catch (RuntimeException e) {
                Slog.w(TAG, "Unexpected exception", e);
            }
        }

        if (initialUserSwitch) {
            InputMethodUtils.setNonSelectedSystemImesDisabledUntilUsed(mIPackageManager,
                    mSettings.getEnabledInputMethodListLocked(), newUserId,
                    mContext.getBasePackageName());
        }

        if (DEBUG) Slog.d(TAG, "Switching user stage 3/3. newUserId=" + newUserId
                + " selectedIme=" + mSettings.getSelectedInputMethod());
    }

    void updateCurrentProfileIds() {
        mSettings.setCurrentProfileIds(
                mUserManager.getProfileIdsWithDisabled(mSettings.getCurrentUserId()));
    }

    @Override
    public boolean onTransact(int code, Parcel data, Parcel reply, int flags)
            throws RemoteException {
        try {
            return super.onTransact(code, data, reply, flags);
        } catch (RuntimeException e) {
            // The input method manager only throws security exceptions, so let's
            // log all others.
            if (!(e instanceof SecurityException)) {
                Slog.wtf(TAG, "Input Method Manager Crash", e);
            }
            throw e;
        }
    }

    public void systemRunning(StatusBarManagerService statusBar) {
        synchronized (mMethodMap) {
            if (DEBUG) {
                Slog.d(TAG, "--- systemReady");
            }
            if (!mSystemReady) {
                mSystemReady = true;
                mLastSystemLocales = mRes.getConfiguration().getLocales();
                final int currentUserId = mSettings.getCurrentUserId();
                mSettings.switchCurrentUser(currentUserId,
                        !mUserManager.isUserUnlockingOrUnlocked(currentUserId));
                mKeyguardManager = mContext.getSystemService(KeyguardManager.class);
                mNotificationManager = mContext.getSystemService(NotificationManager.class);
                mStatusBar = statusBar;
                if (mStatusBar != null) {
                    mStatusBar.setIconVisibility(mSlotIme, false);
                }
                updateSystemUiLocked(mCurToken, mImeWindowVis, mBackDisposition);
                mShowOngoingImeSwitcherForPhones = mRes.getBoolean(
                        com.android.internal.R.bool.show_ongoing_ime_switcher);
                if (mShowOngoingImeSwitcherForPhones) {
                    mWindowManagerInternal.setOnHardKeyboardStatusChangeListener(
                            mHardKeyboardListener);
                }

                mMyPackageMonitor.register(mContext, null, UserHandle.ALL, true);
                mSettingsObserver.registerContentObserverLocked(currentUserId);

                final IntentFilter broadcastFilter = new IntentFilter();
                broadcastFilter.addAction(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
                broadcastFilter.addAction(Intent.ACTION_USER_ADDED);
                broadcastFilter.addAction(Intent.ACTION_USER_REMOVED);
                broadcastFilter.addAction(Intent.ACTION_SETTING_RESTORED);
                broadcastFilter.addAction(Intent.ACTION_LOCALE_CHANGED);
                mContext.registerReceiver(new ImmsBroadcastReceiver(), broadcastFilter);

                buildInputMethodListLocked(true /* resetDefaultEnabledIme */);
                resetDefaultImeLocked(mContext);
                updateFromSettingsLocked(true);
                InputMethodUtils.setNonSelectedSystemImesDisabledUntilUsed(mIPackageManager,
                        mSettings.getEnabledInputMethodListLocked(), currentUserId,
                        mContext.getBasePackageName());

                try {
                    startInputInnerLocked();
                } catch (RuntimeException e) {
                    Slog.w(TAG, "Unexpected exception", e);
                }
            }
        }
    }

    // ---------------------------------------------------------------------------------------
    // Check whether or not this is a valid IPC. Assumes an IPC is valid when either
    // 1) it comes from the system process
    // 2) the calling process' user id is identical to the current user id IMMS thinks.
    private boolean calledFromValidUser() {
        final int uid = Binder.getCallingUid();
        final int userId = UserHandle.getUserId(uid);
        if (DEBUG) {
            Slog.d(TAG, "--- calledFromForegroundUserOrSystemProcess ? "
                    + "calling uid = " + uid + " system uid = " + Process.SYSTEM_UID
                    + " calling userId = " + userId + ", foreground user id = "
                    + mSettings.getCurrentUserId() + ", calling pid = " + Binder.getCallingPid()
                    + InputMethodUtils.getApiCallStack());
        }
        if (uid == Process.SYSTEM_UID || mSettings.isCurrentProfile(userId)) {
            return true;
        }

        // Caveat: A process which has INTERACT_ACROSS_USERS_FULL gets results for the
        // foreground user, not for the user of that process. Accordingly InputMethodManagerService
        // must not manage background users' states in any functions.
        // Note that privacy-sensitive IPCs, such as setInputMethod, are still securely guarded
        // by a token.
        if (mContext.checkCallingOrSelfPermission(
                android.Manifest.permission.INTERACT_ACROSS_USERS_FULL)
                        == PackageManager.PERMISSION_GRANTED) {
            if (DEBUG) {
                Slog.d(TAG, "--- Access granted because the calling process has "
                        + "the INTERACT_ACROSS_USERS_FULL permission");
            }
            return true;
        }
        // TODO(b/34886274): The semantics of this verification is actually not well-defined.
        Slog.w(TAG, "--- IPC called from background users. Ignore. callers="
                + Debug.getCallers(10));
        return false;
    }


    /**
     * Returns true iff the caller is identified to be the current input method with the token.
     * @param token The window token given to the input method when it was started.
     * @return true if and only if non-null valid token is specified.
     */
    private boolean calledWithValidToken(@Nullable IBinder token) {
        if (token == null && Binder.getCallingPid() == Process.myPid()) {
            if (DEBUG) {
                // TODO(b/34851776): Basically it's the caller's fault if we reach here.
                Slog.d(TAG, "Bug 34851776 is detected callers=" + Debug.getCallers(10));
            }
            return false;
        }
        if (token == null || token != mCurToken) {
            // TODO(b/34886274): The semantics of this verification is actually not well-defined.
            Slog.e(TAG, "Ignoring " + Debug.getCaller() + " due to an invalid token."
                    + " uid:" + Binder.getCallingUid() + " token:" + token);
            return false;
        }
        return true;
    }

    private boolean bindCurrentInputMethodService(
            Intent service, ServiceConnection conn, int flags) {
        if (service == null || conn == null) {
            Slog.e(TAG, "--- bind failed: service = " + service + ", conn = " + conn);
            return false;
        }
        return mContext.bindServiceAsUser(service, conn, flags,
                new UserHandle(mSettings.getCurrentUserId()));
    }

    @Override
    public List<InputMethodInfo> getInputMethodList() {
        // TODO: Make this work even for non-current users?
        if (!calledFromValidUser()) {
            return Collections.emptyList();
        }
        synchronized (mMethodMap) {
            return new ArrayList<>(mMethodList);
        }
    }

    @Override
    public List<InputMethodInfo> getEnabledInputMethodList() {
        // TODO: Make this work even for non-current users?
        if (!calledFromValidUser()) {
            return Collections.emptyList();
        }
        synchronized (mMethodMap) {
            return mSettings.getEnabledInputMethodListLocked();
        }
    }

    /**
     * @param imiId if null, returns enabled subtypes for the current imi
     * @return enabled subtypes of the specified imi
     */
    @Override
    public List<InputMethodSubtype> getEnabledInputMethodSubtypeList(String imiId,
            boolean allowsImplicitlySelectedSubtypes) {
        // TODO: Make this work even for non-current users?
        if (!calledFromValidUser()) {
            return Collections.emptyList();
        }
        synchronized (mMethodMap) {
            final InputMethodInfo imi;
            if (imiId == null && mCurMethodId != null) {
                imi = mMethodMap.get(mCurMethodId);
            } else {
                imi = mMethodMap.get(imiId);
            }
            if (imi == null) {
                return Collections.emptyList();
            }
            return mSettings.getEnabledInputMethodSubtypeListLocked(
                    mContext, imi, allowsImplicitlySelectedSubtypes);
        }
    }

    @Override
    public void addClient(IInputMethodClient client,
            IInputContext inputContext, int uid, int pid) {
        if (!calledFromValidUser()) {
            return;
        }
        synchronized (mMethodMap) {
            mClients.put(client.asBinder(), new ClientState(client,
                    inputContext, uid, pid));
        }
    }

    @Override
    public void removeClient(IInputMethodClient client) {
        if (!calledFromValidUser()) {
            return;
        }
        synchronized (mMethodMap) {
            ClientState cs = mClients.remove(client.asBinder());
            if (cs != null) {
                clearClientSessionLocked(cs);
                if (mCurClient == cs) {
                    mCurClient = null;
                }
                if (mCurFocusedWindowClient == cs) {
                    mCurFocusedWindowClient = null;
                }
            }
        }
    }

    void executeOrSendMessage(IInterface target, Message msg) {
         if (target.asBinder() instanceof Binder) {
             mCaller.sendMessage(msg);
         } else {
             handleMessage(msg);
             msg.recycle();
         }
    }

    void unbindCurrentClientLocked(
            /* @InputMethodClient.UnbindReason */ final int unbindClientReason) {
        if (mCurClient != null) {
            if (DEBUG) Slog.v(TAG, "unbindCurrentInputLocked: client="
                    + mCurClient.client.asBinder());
            if (mBoundToMethod) {
                mBoundToMethod = false;
                if (mCurMethod != null) {
                    executeOrSendMessage(mCurMethod, mCaller.obtainMessageO(
                            MSG_UNBIND_INPUT, mCurMethod));
                }
            }

            executeOrSendMessage(mCurClient.client, mCaller.obtainMessageIIO(
                    MSG_SET_ACTIVE, 0, 0, mCurClient));
            executeOrSendMessage(mCurClient.client, mCaller.obtainMessageIIO(
                    MSG_UNBIND_CLIENT, mCurSeq, unbindClientReason, mCurClient.client));
            mCurClient.sessionRequested = false;
            mCurClient = null;

            hideInputMethodMenuLocked();
        }
    }

    private int getImeShowFlags() {
        int flags = 0;
        if (mShowForced) {
            flags |= InputMethod.SHOW_FORCED
                    | InputMethod.SHOW_EXPLICIT;
        } else if (mShowExplicitlyRequested) {
            flags |= InputMethod.SHOW_EXPLICIT;
        }
        return flags;
    }

    private int getAppShowFlags() {
        int flags = 0;
        if (mShowForced) {
            flags |= InputMethodManager.SHOW_FORCED;
        } else if (!mShowExplicitlyRequested) {
            flags |= InputMethodManager.SHOW_IMPLICIT;
        }
        return flags;
    }

    InputBindResult attachNewInputLocked(
            /* @InputMethodClient.StartInputReason */ final int startInputReason, boolean initial) {
        if (!mBoundToMethod) {
            executeOrSendMessage(mCurMethod, mCaller.obtainMessageOO(
                    MSG_BIND_INPUT, mCurMethod, mCurClient.binding));
            mBoundToMethod = true;
        }

        final Binder startInputToken = new Binder();
        final StartInputInfo info = new StartInputInfo(mCurToken, mCurId, startInputReason,
                !initial, mCurFocusedWindow, mCurAttribute, mCurFocusedWindowSoftInputMode,
                mCurSeq);
        mStartInputMap.put(startInputToken, info);
        mStartInputHistory.addEntry(info);

        final SessionState session = mCurClient.curSession;
        executeOrSendMessage(session.method, mCaller.obtainMessageIIOOOO(
                MSG_START_INPUT, mCurInputContextMissingMethods, initial ? 0 : 1 /* restarting */,
                startInputToken, session, mCurInputContext, mCurAttribute));
        if (mShowRequested) {
            if (DEBUG) Slog.v(TAG, "Attach new input asks to show input");
            showCurrentInputLocked(getAppShowFlags(), null);
        }
        return new InputBindResult(session.session,
                (session.channel != null ? session.channel.dup() : null),
                mCurId, mCurSeq, mCurUserActionNotificationSequenceNumber);
    }

    InputBindResult startInputLocked(
            /* @InputMethodClient.StartInputReason */ final int startInputReason,
            IInputMethodClient client, IInputContext inputContext,
            /* @InputConnectionInspector.missingMethods */ final int missingMethods,
            @Nullable EditorInfo attribute, int controlFlags) {
        // If no method is currently selected, do nothing.
        if (mCurMethodId == null) {
            return mNoBinding;
        }

        ClientState cs = mClients.get(client.asBinder());
        if (cs == null) {
            throw new IllegalArgumentException("unknown client "
                    + client.asBinder());
        }

        if (attribute == null) {
            Slog.w(TAG, "Ignoring startInput with null EditorInfo."
                    + " uid=" + cs.uid + " pid=" + cs.pid);
            return null;
        }

        try {
            if (!mIWindowManager.inputMethodClientHasFocus(cs.client)) {
                // Check with the window manager to make sure this client actually
                // has a window with focus.  If not, reject.  This is thread safe
                // because if the focus changes some time before or after, the
                // next client receiving focus that has any interest in input will
                // be calling through here after that change happens.
                if (DEBUG) {
                    Slog.w(TAG, "Starting input on non-focused client " + cs.client
                            + " (uid=" + cs.uid + " pid=" + cs.pid + ")");
                }
                return null;
            }
        } catch (RemoteException e) {
        }

        return startInputUncheckedLocked(cs, inputContext, missingMethods, attribute,
                controlFlags, startInputReason);
    }

    InputBindResult startInputUncheckedLocked(@NonNull ClientState cs, IInputContext inputContext,
            /* @InputConnectionInspector.missingMethods */ final int missingMethods,
            @NonNull EditorInfo attribute, int controlFlags,
            /* @InputMethodClient.StartInputReason */ final int startInputReason) {
        // If no method is currently selected, do nothing.
        if (mCurMethodId == null) {
            return mNoBinding;
        }

        if (!InputMethodUtils.checkIfPackageBelongsToUid(mAppOpsManager, cs.uid,
                attribute.packageName)) {
            Slog.e(TAG, "Rejecting this client as it reported an invalid package name."
                    + " uid=" + cs.uid + " package=" + attribute.packageName);
            return mNoBinding;
        }

        if (mCurClient != cs) {
            // Was the keyguard locked when switching over to the new client?
            mCurClientInKeyguard = isKeyguardLocked();
            // If the client is changing, we need to switch over to the new
            // one.
            unbindCurrentClientLocked(InputMethodClient.UNBIND_REASON_SWITCH_CLIENT);
            if (DEBUG) Slog.v(TAG, "switching to client: client="
                    + cs.client.asBinder() + " keyguard=" + mCurClientInKeyguard);

            // If the screen is on, inform the new client it is active
            if (mIsInteractive) {
                executeOrSendMessage(cs.client, mCaller.obtainMessageIO(
                        MSG_SET_ACTIVE, mIsInteractive ? 1 : 0, cs));
            }
        }

        // Bump up the sequence for this client and attach it.
        mCurSeq++;
        if (mCurSeq <= 0) mCurSeq = 1;
        mCurClient = cs;
        mCurInputContext = inputContext;
        mCurInputContextMissingMethods = missingMethods;
        mCurAttribute = attribute;

        // Check if the input method is changing.
        if (mCurId != null && mCurId.equals(mCurMethodId)) {
            if (cs.curSession != null) {
                // Fast case: if we are already connected to the input method,
                // then just return it.
                return attachNewInputLocked(startInputReason,
                        (controlFlags&InputMethodManager.CONTROL_START_INITIAL) != 0);
            }
            if (mHaveConnection) {
                if (mCurMethod != null) {
                    // Return to client, and we will get back with it when
                    // we have had a session made for it.
                    requestClientSessionLocked(cs);
                    return new InputBindResult(null, null, mCurId, mCurSeq,
                            mCurUserActionNotificationSequenceNumber);
                } else if (SystemClock.uptimeMillis()
                        < (mLastBindTime+TIME_TO_RECONNECT)) {
                    // In this case we have connected to the service, but
                    // don't yet have its interface.  If it hasn't been too
                    // long since we did the connection, we'll return to
                    // the client and wait to get the service interface so
                    // we can report back.  If it has been too long, we want
                    // to fall through so we can try a disconnect/reconnect
                    // to see if we can get back in touch with the service.
                    return new InputBindResult(null, null, mCurId, mCurSeq,
                            mCurUserActionNotificationSequenceNumber);
                } else {
                    EventLog.writeEvent(EventLogTags.IMF_FORCE_RECONNECT_IME,
                            mCurMethodId, SystemClock.uptimeMillis()-mLastBindTime, 0);
                }
            }
        }

        return startInputInnerLocked();
    }

    InputBindResult startInputInnerLocked() {
        if (mCurMethodId == null) {
            return mNoBinding;
        }

        if (!mSystemReady) {
            // If the system is not yet ready, we shouldn't be running third
            // party code.
            return new InputBindResult(null, null, mCurMethodId, mCurSeq,
                    mCurUserActionNotificationSequenceNumber);
        }

        InputMethodInfo info = mMethodMap.get(mCurMethodId);
        if (info == null) {
            throw new IllegalArgumentException("Unknown id: " + mCurMethodId);
        }

        unbindCurrentMethodLocked(true);

        mCurIntent = new Intent(InputMethod.SERVICE_INTERFACE);
        mCurIntent.setComponent(info.getComponent());
        mCurIntent.putExtra(Intent.EXTRA_CLIENT_LABEL,
                com.android.internal.R.string.input_method_binding_label);
        mCurIntent.putExtra(Intent.EXTRA_CLIENT_INTENT, PendingIntent.getActivity(
                mContext, 0, new Intent(Settings.ACTION_INPUT_METHOD_SETTINGS), 0));
        if (bindCurrentInputMethodService(mCurIntent, this, Context.BIND_AUTO_CREATE
                | Context.BIND_NOT_VISIBLE | Context.BIND_NOT_FOREGROUND
                | Context.BIND_SHOWING_UI)) {
            mLastBindTime = SystemClock.uptimeMillis();
            mHaveConnection = true;
            mCurId = info.getId();
            mCurToken = new Binder();
            try {
                if (DEBUG) Slog.v(TAG, "Adding window token: " + mCurToken);
                mIWindowManager.addWindowToken(mCurToken, TYPE_INPUT_METHOD, DEFAULT_DISPLAY);
            } catch (RemoteException e) {
            }
            return new InputBindResult(null, null, mCurId, mCurSeq,
                    mCurUserActionNotificationSequenceNumber);
        } else {
            mCurIntent = null;
            Slog.w(TAG, "Failure connecting to input method service: "
                    + mCurIntent);
        }
        return null;
    }

    private InputBindResult startInput(
            /* @InputMethodClient.StartInputReason */ final int startInputReason,
            IInputMethodClient client, IInputContext inputContext,
            /* @InputConnectionInspector.missingMethods */ final int missingMethods,
            @Nullable EditorInfo attribute, int controlFlags) {
        if (!calledFromValidUser()) {
            return null;
        }
        synchronized (mMethodMap) {
            if (DEBUG) {
                Slog.v(TAG, "startInput: reason="
                        + InputMethodClient.getStartInputReason(startInputReason)
                        + " client = " + client.asBinder()
                        + " inputContext=" + inputContext
                        + " missingMethods="
                        + InputConnectionInspector.getMissingMethodFlagsAsString(missingMethods)
                        + " attribute=" + attribute
                        + " controlFlags=#" + Integer.toHexString(controlFlags));
            }
            final long ident = Binder.clearCallingIdentity();
            try {
                return startInputLocked(startInputReason, client, inputContext, missingMethods,
                        attribute, controlFlags);
            } finally {
                Binder.restoreCallingIdentity(ident);
            }
        }
    }

    @Override
    public void finishInput(IInputMethodClient client) {
    }

    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        synchronized (mMethodMap) {
            if (mCurIntent != null && name.equals(mCurIntent.getComponent())) {
                mCurMethod = IInputMethod.Stub.asInterface(service);
                if (mCurToken == null) {
                    Slog.w(TAG, "Service connected without a token!");
                    unbindCurrentMethodLocked(false);
                    return;
                }
                if (DEBUG) Slog.v(TAG, "Initiating attach with token: " + mCurToken);
                executeOrSendMessage(mCurMethod, mCaller.obtainMessageOO(
                        MSG_ATTACH_TOKEN, mCurMethod, mCurToken));
                if (mCurClient != null) {
                    clearClientSessionLocked(mCurClient);
                    requestClientSessionLocked(mCurClient);
                }
            }
        }
    }

    void onSessionCreated(IInputMethod method, IInputMethodSession session,
            InputChannel channel) {
        synchronized (mMethodMap) {
            if (mCurMethod != null && method != null
                    && mCurMethod.asBinder() == method.asBinder()) {
                if (mCurClient != null) {
                    clearClientSessionLocked(mCurClient);
                    mCurClient.curSession = new SessionState(mCurClient,
                            method, session, channel);
                    InputBindResult res = attachNewInputLocked(
                            InputMethodClient.START_INPUT_REASON_SESSION_CREATED_BY_IME, true);
                    if (res.method != null) {
                        executeOrSendMessage(mCurClient.client, mCaller.obtainMessageOO(
                                MSG_BIND_CLIENT, mCurClient.client, res));
                    }
                    return;
                }
            }
        }

        // Session abandoned.  Close its associated input channel.
        channel.dispose();
    }

    void unbindCurrentMethodLocked(boolean savePosition) {
        if (mVisibleBound) {
            mContext.unbindService(mVisibleConnection);
            mVisibleBound = false;
        }

        if (mHaveConnection) {
            mContext.unbindService(this);
            mHaveConnection = false;
        }

        if (mCurToken != null) {
            try {
                if (DEBUG) Slog.v(TAG, "Removing window token: " + mCurToken);
                if ((mImeWindowVis & InputMethodService.IME_ACTIVE) != 0 && savePosition) {
                    // The current IME is shown. Hence an IME switch (transition) is happening.
                    mWindowManagerInternal.saveLastInputMethodWindowForTransition();
                }
                mIWindowManager.removeWindowToken(mCurToken, DEFAULT_DISPLAY);
            } catch (RemoteException e) {
            }
            mCurToken = null;
        }

        mCurId = null;
        clearCurMethodLocked();
    }

    void resetCurrentMethodAndClient(
            /* @InputMethodClient.UnbindReason */ final int unbindClientReason) {
        mCurMethodId = null;
        unbindCurrentMethodLocked(false);
        unbindCurrentClientLocked(unbindClientReason);
    }

    void requestClientSessionLocked(ClientState cs) {
        if (!cs.sessionRequested) {
            if (DEBUG) Slog.v(TAG, "Creating new session for client " + cs);
            InputChannel[] channels = InputChannel.openInputChannelPair(cs.toString());
            cs.sessionRequested = true;
            executeOrSendMessage(mCurMethod, mCaller.obtainMessageOOO(
                    MSG_CREATE_SESSION, mCurMethod, channels[1],
                    new MethodCallback(this, mCurMethod, channels[0])));
        }
    }

    void clearClientSessionLocked(ClientState cs) {
        finishSessionLocked(cs.curSession);
        cs.curSession = null;
        cs.sessionRequested = false;
    }

    private void finishSessionLocked(SessionState sessionState) {
        if (sessionState != null) {
            if (sessionState.session != null) {
                try {
                    sessionState.session.finishSession();
                } catch (RemoteException e) {
                    Slog.w(TAG, "Session failed to close due to remote exception", e);
                    updateSystemUiLocked(mCurToken, 0 /* vis */, mBackDisposition);
                }
                sessionState.session = null;
            }
            if (sessionState.channel != null) {
                sessionState.channel.dispose();
                sessionState.channel = null;
            }
        }
    }

    void clearCurMethodLocked() {
        if (mCurMethod != null) {
            for (ClientState cs : mClients.values()) {
                clearClientSessionLocked(cs);
            }

            finishSessionLocked(mEnabledSession);
            mEnabledSession = null;
            mCurMethod = null;
        }
        if (mStatusBar != null) {
            mStatusBar.setIconVisibility(mSlotIme, false);
        }
        mInFullscreenMode = false;
    }

    @Override
    public void onServiceDisconnected(ComponentName name) {
        // Note that mContext.unbindService(this) does not trigger this.  Hence if we are here the
        // disconnection is not intended by IMMS (e.g. triggered because the current IMS crashed),
        // which is irregular but can eventually happen for everyone just by continuing using the
        // device.  Thus it is important to make sure that all the internal states are properly
        // refreshed when this method is called back.  Running
        //    adb install -r <APK that implements the current IME>
        // would be a good way to trigger such a situation.
        synchronized (mMethodMap) {
            if (DEBUG) Slog.v(TAG, "Service disconnected: " + name
                    + " mCurIntent=" + mCurIntent);
            if (mCurMethod != null && mCurIntent != null
                    && name.equals(mCurIntent.getComponent())) {
                clearCurMethodLocked();
                // We consider this to be a new bind attempt, since the system
                // should now try to restart the service for us.
                mLastBindTime = SystemClock.uptimeMillis();
                mShowRequested = mInputShown;
                mInputShown = false;
                unbindCurrentClientLocked(InputMethodClient.UNBIND_REASON_DISCONNECT_IME);
            }
        }
    }

    @Override
    public void updateStatusIcon(IBinder token, String packageName, int iconId) {
        synchronized (mMethodMap) {
            if (!calledWithValidToken(token)) {
                return;
            }
            final long ident = Binder.clearCallingIdentity();
            try {
                if (iconId == 0) {
                    if (DEBUG) Slog.d(TAG, "hide the small icon for the input method");
                    if (mStatusBar != null) {
                        mStatusBar.setIconVisibility(mSlotIme, false);
                    }
                } else if (packageName != null) {
                    if (DEBUG) Slog.d(TAG, "show a small icon for the input method");
                    CharSequence contentDescription = null;
                    try {
                        // Use PackageManager to load label
                        final PackageManager packageManager = mContext.getPackageManager();
                        contentDescription = packageManager.getApplicationLabel(
                                mIPackageManager.getApplicationInfo(packageName, 0,
                                        mSettings.getCurrentUserId()));
                    } catch (RemoteException e) {
                        /* ignore */
                    }
                    if (mStatusBar != null) {
                        mStatusBar.setIcon(mSlotIme, packageName, iconId, 0,
                                contentDescription  != null
                                        ? contentDescription.toString() : null);
                        mStatusBar.setIconVisibility(mSlotIme, true);
                    }
                }
            } finally {
                Binder.restoreCallingIdentity(ident);
            }
        }
    }

    private boolean shouldShowImeSwitcherLocked(int visibility) {
        if (!mShowOngoingImeSwitcherForPhones) return false;
        if (mSwitchingDialog != null) return false;
        if (isScreenLocked()) return false;
        if ((visibility & InputMethodService.IME_ACTIVE) == 0) return false;
        if (mWindowManagerInternal.isHardKeyboardAvailable()) {
            if (mHardKeyboardBehavior == HardKeyboardBehavior.WIRELESS_AFFORDANCE) {
                // When physical keyboard is attached, we show the ime switcher (or notification if
                // NavBar is not available) because SHOW_IME_WITH_HARD_KEYBOARD settings currently
                // exists in the IME switcher dialog.  Might be OK to remove this condition once
                // SHOW_IME_WITH_HARD_KEYBOARD settings finds a good place to live.
                return true;
            }
        } else if ((visibility & InputMethodService.IME_VISIBLE) == 0) {
            return false;
        }

        List<InputMethodInfo> imis = mSettings.getEnabledInputMethodListLocked();
        final int N = imis.size();
        if (N > 2) return true;
        if (N < 1) return false;
        int nonAuxCount = 0;
        int auxCount = 0;
        InputMethodSubtype nonAuxSubtype = null;
        InputMethodSubtype auxSubtype = null;
        for(int i = 0; i < N; ++i) {
            final InputMethodInfo imi = imis.get(i);
            final List<InputMethodSubtype> subtypes =
                    mSettings.getEnabledInputMethodSubtypeListLocked(mContext, imi, true);
            final int subtypeCount = subtypes.size();
            if (subtypeCount == 0) {
                ++nonAuxCount;
            } else {
                for (int j = 0; j < subtypeCount; ++j) {
                    final InputMethodSubtype subtype = subtypes.get(j);
                    if (!subtype.isAuxiliary()) {
                        ++nonAuxCount;
                        nonAuxSubtype = subtype;
                    } else {
                        ++auxCount;
                        auxSubtype = subtype;
                    }
                }
            }
        }
        if (nonAuxCount > 1 || auxCount > 1) {
            return true;
        } else if (nonAuxCount == 1 && auxCount == 1) {
            if (nonAuxSubtype != null && auxSubtype != null
                    && (nonAuxSubtype.getLocale().equals(auxSubtype.getLocale())
                            || auxSubtype.overridesImplicitlyEnabledSubtype()
                            || nonAuxSubtype.overridesImplicitlyEnabledSubtype())
                    && nonAuxSubtype.containsExtraValueKey(TAG_TRY_SUPPRESSING_IME_SWITCHER)) {
                return false;
            }
            return true;
        }
        return false;
    }

    private boolean isKeyguardLocked() {
        return mKeyguardManager != null && mKeyguardManager.isKeyguardLocked();
    }

    @SuppressWarnings("deprecation")
    @Override
    public void setImeWindowStatus(IBinder token, IBinder startInputToken, int vis,
            int backDisposition) {
        if (startInputToken == null) {
            throw new InvalidParameterException("startInputToken cannot be null");
        }

        if (!calledWithValidToken(token)) {
            return;
        }

        final StartInputInfo info;
        synchronized (mMethodMap) {
            info = mStartInputMap.get(startInputToken);
            if (info == null) {
                throw new InvalidParameterException("Unknown startInputToken=" + startInputToken);
            }
            mImeWindowVis = vis;
            mBackDisposition = backDisposition;
            updateSystemUiLocked(token, vis, backDisposition);
        }
        mWindowManagerInternal.updateInputMethodWindowStatus(info.mImeToken,
                (vis & InputMethodService.IME_VISIBLE) != 0, info.mTargetWindow);
    }

    private void updateSystemUi(IBinder token, int vis, int backDisposition) {
        synchronized (mMethodMap) {
            updateSystemUiLocked(token, vis, backDisposition);
        }
    }

    // Caution! This method is called in this class. Handle multi-user carefully
    private void updateSystemUiLocked(IBinder token, int vis, int backDisposition) {
        if (!calledWithValidToken(token)) {
            return;
        }

        // TODO: Move this clearing calling identity block to setImeWindowStatus after making sure
        // all updateSystemUi happens on system previlege.
        final long ident = Binder.clearCallingIdentity();
        try {
            // apply policy for binder calls
            if (vis != 0 && isKeyguardLocked() && !mCurClientInKeyguard) {
                vis = 0;
            }
            // mImeWindowVis should be updated before calling shouldShowImeSwitcherLocked().
            final boolean needsToShowImeSwitcher = shouldShowImeSwitcherLocked(vis);
            if (mStatusBar != null) {
                mStatusBar.setImeWindowStatus(token, vis, backDisposition,
                        needsToShowImeSwitcher);
            }
            final InputMethodInfo imi = mMethodMap.get(mCurMethodId);
            if (imi != null && needsToShowImeSwitcher) {
                // Used to load label
                final CharSequence title = mRes.getText(
                        com.android.internal.R.string.select_input_method);
                final CharSequence summary = InputMethodUtils.getImeAndSubtypeDisplayName(
                        mContext, imi, mCurrentSubtype);
                mImeSwitcherNotification.setContentTitle(title)
                        .setContentText(summary)
                        .setContentIntent(mImeSwitchPendingIntent);
                try {
                    if ((mNotificationManager != null)
                            && !mIWindowManager.hasNavigationBar()) {
                        if (DEBUG) {
                            Slog.d(TAG, "--- show notification: label =  " + summary);
                        }
                        mNotificationManager.notifyAsUser(null,
                                com.android.internal.R.string.select_input_method,
                                mImeSwitcherNotification.build(), UserHandle.ALL);
                        mNotificationShown = true;
                    }
                } catch (RemoteException e) {
                }
            } else {
                if (mNotificationShown && mNotificationManager != null) {
                    if (DEBUG) {
                        Slog.d(TAG, "--- hide notification");
                    }
                    mNotificationManager.cancelAsUser(null,
                            com.android.internal.R.string.select_input_method, UserHandle.ALL);
                    mNotificationShown = false;
                }
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    @Override
    public void registerSuggestionSpansForNotification(SuggestionSpan[] spans) {
        if (!calledFromValidUser()) {
            return;
        }
        synchronized (mMethodMap) {
            final InputMethodInfo currentImi = mMethodMap.get(mCurMethodId);
            for (int i = 0; i < spans.length; ++i) {
                SuggestionSpan ss = spans[i];
                if (!TextUtils.isEmpty(ss.getNotificationTargetClassName())) {
                    mSecureSuggestionSpans.put(ss, currentImi);
                }
            }
        }
    }

    @Override
    public boolean notifySuggestionPicked(SuggestionSpan span, String originalString, int index) {
        if (!calledFromValidUser()) {
            return false;
        }
        synchronized (mMethodMap) {
            final InputMethodInfo targetImi = mSecureSuggestionSpans.get(span);
            // TODO: Do not send the intent if the process of the targetImi is already dead.
            if (targetImi != null) {
                final String[] suggestions = span.getSuggestions();
                if (index < 0 || index >= suggestions.length) return false;
                final String className = span.getNotificationTargetClassName();
                final Intent intent = new Intent();
                // Ensures that only a class in the original IME package will receive the
                // notification.
                intent.setClassName(targetImi.getPackageName(), className);
                intent.setAction(SuggestionSpan.ACTION_SUGGESTION_PICKED);
                intent.putExtra(SuggestionSpan.SUGGESTION_SPAN_PICKED_BEFORE, originalString);
                intent.putExtra(SuggestionSpan.SUGGESTION_SPAN_PICKED_AFTER, suggestions[index]);
                intent.putExtra(SuggestionSpan.SUGGESTION_SPAN_PICKED_HASHCODE, span.hashCode());
                final long ident = Binder.clearCallingIdentity();
                try {
                    mContext.sendBroadcastAsUser(intent, UserHandle.CURRENT);
                } finally {
                    Binder.restoreCallingIdentity(ident);
                }
                return true;
            }
        }
        return false;
    }

    void updateFromSettingsLocked(boolean enabledMayChange) {
        updateInputMethodsFromSettingsLocked(enabledMayChange);
        updateKeyboardFromSettingsLocked();
    }

    void updateInputMethodsFromSettingsLocked(boolean enabledMayChange) {
        if (enabledMayChange) {
            List<InputMethodInfo> enabled = mSettings.getEnabledInputMethodListLocked();
            for (int i=0; i<enabled.size(); i++) {
                // We allow the user to select "disabled until used" apps, so if they
                // are enabling one of those here we now need to make it enabled.
                InputMethodInfo imm = enabled.get(i);
                try {
                    ApplicationInfo ai = mIPackageManager.getApplicationInfo(imm.getPackageName(),
                            PackageManager.GET_DISABLED_UNTIL_USED_COMPONENTS,
                            mSettings.getCurrentUserId());
                    if (ai != null && ai.enabledSetting
                            == PackageManager.COMPONENT_ENABLED_STATE_DISABLED_UNTIL_USED) {
                        if (DEBUG) {
                            Slog.d(TAG, "Update state(" + imm.getId()
                                    + "): DISABLED_UNTIL_USED -> DEFAULT");
                        }
                        mIPackageManager.setApplicationEnabledSetting(imm.getPackageName(),
                                PackageManager.COMPONENT_ENABLED_STATE_DEFAULT,
                                PackageManager.DONT_KILL_APP, mSettings.getCurrentUserId(),
                                mContext.getBasePackageName());
                    }
                } catch (RemoteException e) {
                }
            }
        }
        // We are assuming that whoever is changing DEFAULT_INPUT_METHOD and
        // ENABLED_INPUT_METHODS is taking care of keeping them correctly in
        // sync, so we will never have a DEFAULT_INPUT_METHOD that is not
        // enabled.
        String id = mSettings.getSelectedInputMethod();
        // There is no input method selected, try to choose new applicable input method.
        if (TextUtils.isEmpty(id) && chooseNewDefaultIMELocked()) {
            id = mSettings.getSelectedInputMethod();
        }
        if (!TextUtils.isEmpty(id)) {
            try {
                setInputMethodLocked(id, mSettings.getSelectedInputMethodSubtypeId(id));
            } catch (IllegalArgumentException e) {
                Slog.w(TAG, "Unknown input method from prefs: " + id, e);
                resetCurrentMethodAndClient(InputMethodClient.UNBIND_REASON_SWITCH_IME_FAILED);
            }
            mShortcutInputMethodsAndSubtypes.clear();
        } else {
            // There is no longer an input method set, so stop any current one.
            resetCurrentMethodAndClient(InputMethodClient.UNBIND_REASON_NO_IME);
        }
        // Here is not the perfect place to reset the switching controller. Ideally
        // mSwitchingController and mSettings should be able to share the same state.
        // TODO: Make sure that mSwitchingController and mSettings are sharing the
        // the same enabled IMEs list.
        mSwitchingController.resetCircularListLocked(mContext);

    }

    public void updateKeyboardFromSettingsLocked() {
        mShowImeWithHardKeyboard = mSettings.isShowImeWithHardKeyboardEnabled();
        if (mSwitchingDialog != null
                && mSwitchingDialogTitleView != null
                && mSwitchingDialog.isShowing()) {
            final Switch hardKeySwitch = (Switch)mSwitchingDialogTitleView.findViewById(
                    com.android.internal.R.id.hard_keyboard_switch);
            hardKeySwitch.setChecked(mShowImeWithHardKeyboard);
        }
    }

    private void notifyInputMethodSubtypeChanged(final int userId,
            @Nullable final InputMethodInfo inputMethodInfo,
            @Nullable final InputMethodSubtype subtype) {
        final InputManagerInternal inputManagerInternal =
                LocalServices.getService(InputManagerInternal.class);
        if (inputManagerInternal != null) {
            inputManagerInternal.onInputMethodSubtypeChanged(userId, inputMethodInfo, subtype);
        }
    }

    /* package */ void setInputMethodLocked(String id, int subtypeId) {
        InputMethodInfo info = mMethodMap.get(id);
        if (info == null) {
            throw new IllegalArgumentException("Unknown id: " + id);
        }

        // See if we need to notify a subtype change within the same IME.
        if (id.equals(mCurMethodId)) {
            final int subtypeCount = info.getSubtypeCount();
            if (subtypeCount <= 0) {
                return;
            }
            final InputMethodSubtype oldSubtype = mCurrentSubtype;
            final InputMethodSubtype newSubtype;
            if (subtypeId >= 0 && subtypeId < subtypeCount) {
                newSubtype = info.getSubtypeAt(subtypeId);
            } else {
                // If subtype is null, try to find the most applicable one from
                // getCurrentInputMethodSubtype.
                newSubtype = getCurrentInputMethodSubtypeLocked();
            }
            if (newSubtype == null || oldSubtype == null) {
                Slog.w(TAG, "Illegal subtype state: old subtype = " + oldSubtype
                        + ", new subtype = " + newSubtype);
                return;
            }
            if (newSubtype != oldSubtype) {
                setSelectedInputMethodAndSubtypeLocked(info, subtypeId, true);
                if (mCurMethod != null) {
                    try {
                        updateSystemUiLocked(mCurToken, mImeWindowVis, mBackDisposition);
                        mCurMethod.changeInputMethodSubtype(newSubtype);
                    } catch (RemoteException e) {
                        Slog.w(TAG, "Failed to call changeInputMethodSubtype");
                        return;
                    }
                }
                notifyInputMethodSubtypeChanged(mSettings.getCurrentUserId(), info, newSubtype);
            }
            return;
        }

        // Changing to a different IME.
        final long ident = Binder.clearCallingIdentity();
        try {
            // Set a subtype to this input method.
            // subtypeId the name of a subtype which will be set.
            setSelectedInputMethodAndSubtypeLocked(info, subtypeId, false);
            // mCurMethodId should be updated after setSelectedInputMethodAndSubtypeLocked()
            // because mCurMethodId is stored as a history in
            // setSelectedInputMethodAndSubtypeLocked().
            mCurMethodId = id;

            if (LocalServices.getService(ActivityManagerInternal.class).isSystemReady()) {
                Intent intent = new Intent(Intent.ACTION_INPUT_METHOD_CHANGED);
                intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);
                intent.putExtra("input_method_id", id);
                mContext.sendBroadcastAsUser(intent, UserHandle.CURRENT);
            }
            unbindCurrentClientLocked(InputMethodClient.UNBIND_REASON_SWITCH_IME);
        } finally {
            Binder.restoreCallingIdentity(ident);
        }

        notifyInputMethodSubtypeChanged(mSettings.getCurrentUserId(), info,
                getCurrentInputMethodSubtypeLocked());
    }

    @Override
    public boolean showSoftInput(IInputMethodClient client, int flags,
            ResultReceiver resultReceiver) {
        if (!calledFromValidUser()) {
            return false;
        }
        int uid = Binder.getCallingUid();
        long ident = Binder.clearCallingIdentity();
        try {
            synchronized (mMethodMap) {
                if (mCurClient == null || client == null
                        || mCurClient.client.asBinder() != client.asBinder()) {
                    try {
                        // We need to check if this is the current client with
                        // focus in the window manager, to allow this call to
                        // be made before input is started in it.
                        if (!mIWindowManager.inputMethodClientHasFocus(client)) {
                            Slog.w(TAG, "Ignoring showSoftInput of uid " + uid + ": " + client);
                            return false;
                        }
                    } catch (RemoteException e) {
                        return false;
                    }
                }

                if (DEBUG) Slog.v(TAG, "Client requesting input be shown");
                return showCurrentInputLocked(flags, resultReceiver);
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    boolean showCurrentInputLocked(int flags, ResultReceiver resultReceiver) {
        mShowRequested = true;
        if (mAccessibilityRequestingNoSoftKeyboard) {
            return false;
        }

        if ((flags&InputMethodManager.SHOW_FORCED) != 0) {
            mShowExplicitlyRequested = true;
            mShowForced = true;
        } else if ((flags&InputMethodManager.SHOW_IMPLICIT) == 0) {
            mShowExplicitlyRequested = true;
        }

        if (!mSystemReady) {
            return false;
        }

        boolean res = false;
        if (mCurMethod != null) {
            if (DEBUG) Slog.d(TAG, "showCurrentInputLocked: mCurToken=" + mCurToken);
            executeOrSendMessage(mCurMethod, mCaller.obtainMessageIOO(
                    MSG_SHOW_SOFT_INPUT, getImeShowFlags(), mCurMethod,
                    resultReceiver));
            mInputShown = true;
            if (mHaveConnection && !mVisibleBound) {
                bindCurrentInputMethodService(
                        mCurIntent, mVisibleConnection, Context.BIND_AUTO_CREATE
                                | Context.BIND_TREAT_LIKE_ACTIVITY
                                | Context.BIND_FOREGROUND_SERVICE);
                mVisibleBound = true;
            }
            res = true;
        } else if (mHaveConnection && SystemClock.uptimeMillis()
                >= (mLastBindTime+TIME_TO_RECONNECT)) {
            // The client has asked to have the input method shown, but
            // we have been sitting here too long with a connection to the
            // service and no interface received, so let's disconnect/connect
            // to try to prod things along.
            EventLog.writeEvent(EventLogTags.IMF_FORCE_RECONNECT_IME, mCurMethodId,
                    SystemClock.uptimeMillis()-mLastBindTime,1);
            Slog.w(TAG, "Force disconnect/connect to the IME in showCurrentInputLocked()");
            mContext.unbindService(this);
            bindCurrentInputMethodService(mCurIntent, this, Context.BIND_AUTO_CREATE
                    | Context.BIND_NOT_VISIBLE);
        } else {
            if (DEBUG) {
                Slog.d(TAG, "Can't show input: connection = " + mHaveConnection + ", time = "
                        + ((mLastBindTime+TIME_TO_RECONNECT) - SystemClock.uptimeMillis()));
            }
        }

        return res;
    }

    @Override
    public boolean hideSoftInput(IInputMethodClient client, int flags,
            ResultReceiver resultReceiver) {
        if (!calledFromValidUser()) {
            return false;
        }
        int uid = Binder.getCallingUid();
        long ident = Binder.clearCallingIdentity();
        try {
            synchronized (mMethodMap) {
                if (mCurClient == null || client == null
                        || mCurClient.client.asBinder() != client.asBinder()) {
                    try {
                        // We need to check if this is the current client with
                        // focus in the window manager, to allow this call to
                        // be made before input is started in it.
                        if (!mIWindowManager.inputMethodClientHasFocus(client)) {
                            if (DEBUG) Slog.w(TAG, "Ignoring hideSoftInput of uid "
                                    + uid + ": " + client);
                            return false;
                        }
                    } catch (RemoteException e) {
                        return false;
                    }
                }

                if (DEBUG) Slog.v(TAG, "Client requesting input be hidden");
                return hideCurrentInputLocked(flags, resultReceiver);
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    boolean hideCurrentInputLocked(int flags, ResultReceiver resultReceiver) {
        if ((flags&InputMethodManager.HIDE_IMPLICIT_ONLY) != 0
                && (mShowExplicitlyRequested || mShowForced)) {
            if (DEBUG) Slog.v(TAG, "Not hiding: explicit show not cancelled by non-explicit hide");
            return false;
        }
        if (mShowForced && (flags&InputMethodManager.HIDE_NOT_ALWAYS) != 0) {
            if (DEBUG) Slog.v(TAG, "Not hiding: forced show not cancelled by not-always hide");
            return false;
        }

        // There is a chance that IMM#hideSoftInput() is called in a transient state where
        // IMMS#InputShown is already updated to be true whereas IMMS#mImeWindowVis is still waiting
        // to be updated with the new value sent from IME process.  Even in such a transient state
        // historically we have accepted an incoming call of IMM#hideSoftInput() from the
        // application process as a valid request, and have even promised such a behavior with CTS
        // since Android Eclair.  That's why we need to accept IMM#hideSoftInput() even when only
        // IMMS#InputShown indicates that the software keyboard is shown.
        // TODO: Clean up, IMMS#mInputShown, IMMS#mImeWindowVis and mShowRequested.
        final boolean shouldHideSoftInput = (mCurMethod != null) && (mInputShown ||
                (mImeWindowVis & InputMethodService.IME_ACTIVE) != 0);
        boolean res;
        if (shouldHideSoftInput) {
            // The IME will report its visible state again after the following message finally
            // delivered to the IME process as an IPC.  Hence the inconsistency between
            // IMMS#mInputShown and IMMS#mImeWindowVis should be resolved spontaneously in
            // the final state.
            executeOrSendMessage(mCurMethod, mCaller.obtainMessageOO(
                    MSG_HIDE_SOFT_INPUT, mCurMethod, resultReceiver));
            res = true;
        } else {
            res = false;
        }
        if (mHaveConnection && mVisibleBound) {
            mContext.unbindService(mVisibleConnection);
            mVisibleBound = false;
        }
        mInputShown = false;
        mShowRequested = false;
        mShowExplicitlyRequested = false;
        mShowForced = false;
        return res;
    }

    @Override
    public InputBindResult startInputOrWindowGainedFocus(
            /* @InputMethodClient.StartInputReason */ final int startInputReason,
            IInputMethodClient client, IBinder windowToken, int controlFlags, int softInputMode,
            int windowFlags, @Nullable EditorInfo attribute, IInputContext inputContext,
            /* @InputConnectionInspector.missingMethods */ final int missingMethods) {
        if (windowToken != null) {
            return windowGainedFocus(startInputReason, client, windowToken, controlFlags,
                    softInputMode, windowFlags, attribute, inputContext, missingMethods);
        } else {
            return startInput(startInputReason, client, inputContext, missingMethods, attribute,
                    controlFlags);
        }
    }

    private InputBindResult windowGainedFocus(
            /* @InputMethodClient.StartInputReason */ final int startInputReason,
            IInputMethodClient client, IBinder windowToken, int controlFlags,
            /* @android.view.WindowManager.LayoutParams.SoftInputModeFlags */ int softInputMode,
            int windowFlags, EditorInfo attribute, IInputContext inputContext,
            /* @InputConnectionInspector.missingMethods */  final int missingMethods) {
        // Needs to check the validity before clearing calling identity
        final boolean calledFromValidUser = calledFromValidUser();
        InputBindResult res = null;
        long ident = Binder.clearCallingIdentity();
        try {
            synchronized (mMethodMap) {
                if (DEBUG) Slog.v(TAG, "windowGainedFocus: reason="
                        + InputMethodClient.getStartInputReason(startInputReason)
                        + " client=" + client.asBinder()
                        + " inputContext=" + inputContext
                        + " missingMethods="
                        + InputConnectionInspector.getMissingMethodFlagsAsString(missingMethods)
                        + " attribute=" + attribute
                        + " controlFlags=#" + Integer.toHexString(controlFlags)
                        + " softInputMode=" + InputMethodClient.softInputModeToString(softInputMode)
                        + " windowFlags=#" + Integer.toHexString(windowFlags));

                ClientState cs = mClients.get(client.asBinder());
                if (cs == null) {
                    throw new IllegalArgumentException("unknown client "
                            + client.asBinder());
                }

                try {
                    if (!mIWindowManager.inputMethodClientHasFocus(cs.client)) {
                        // Check with the window manager to make sure this client actually
                        // has a window with focus.  If not, reject.  This is thread safe
                        // because if the focus changes some time before or after, the
                        // next client receiving focus that has any interest in input will
                        // be calling through here after that change happens.
                        if (DEBUG) {
                            Slog.w(TAG, "Focus gain on non-focused client " + cs.client
                                    + " (uid=" + cs.uid + " pid=" + cs.pid + ")");
                        }
                        return null;
                    }
                } catch (RemoteException e) {
                }

                if (!calledFromValidUser) {
                    Slog.w(TAG, "A background user is requesting window. Hiding IME.");
                    Slog.w(TAG, "If you want to interect with IME, you need "
                            + "android.permission.INTERACT_ACROSS_USERS_FULL");
                    hideCurrentInputLocked(0, null);
                    return null;
                }

                if (mCurFocusedWindow == windowToken) {
                    if (DEBUG) {
                        Slog.w(TAG, "Window already focused, ignoring focus gain of: " + client
                                + " attribute=" + attribute + ", token = " + windowToken);
                    }
                    if (attribute != null) {
                        return startInputUncheckedLocked(cs, inputContext, missingMethods,
                                attribute, controlFlags, startInputReason);
                    }
                    return null;
                }
                mCurFocusedWindow = windowToken;
                mCurFocusedWindowSoftInputMode = softInputMode;
                mCurFocusedWindowClient = cs;

                // Should we auto-show the IME even if the caller has not
                // specified what should be done with it?
                // We only do this automatically if the window can resize
                // to accommodate the IME (so what the user sees will give
                // them good context without input information being obscured
                // by the IME) or if running on a large screen where there
                // is more room for the target window + IME.
                final boolean doAutoShow =
                        (softInputMode & WindowManager.LayoutParams.SOFT_INPUT_MASK_ADJUST)
                                == WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE
                        || mRes.getConfiguration().isLayoutSizeAtLeast(
                                Configuration.SCREENLAYOUT_SIZE_LARGE);
                final boolean isTextEditor =
                        (controlFlags&InputMethodManager.CONTROL_WINDOW_IS_TEXT_EDITOR) != 0;

                // We want to start input before showing the IME, but after closing
                // it.  We want to do this after closing it to help the IME disappear
                // more quickly (not get stuck behind it initializing itself for the
                // new focused input, even if its window wants to hide the IME).
                boolean didStart = false;

                switch (softInputMode&WindowManager.LayoutParams.SOFT_INPUT_MASK_STATE) {
                    case WindowManager.LayoutParams.SOFT_INPUT_STATE_UNSPECIFIED:
                        if (!isTextEditor || !doAutoShow) {
                            if (WindowManager.LayoutParams.mayUseInputMethod(windowFlags)) {
                                // There is no focus view, and this window will
                                // be behind any soft input window, so hide the
                                // soft input window if it is shown.
                                if (DEBUG) Slog.v(TAG, "Unspecified window will hide input");
                                hideCurrentInputLocked(InputMethodManager.HIDE_NOT_ALWAYS, null);
                            }
                        } else if (isTextEditor && doAutoShow && (softInputMode &
                                WindowManager.LayoutParams.SOFT_INPUT_IS_FORWARD_NAVIGATION) != 0) {
                            // There is a focus view, and we are navigating forward
                            // into the window, so show the input window for the user.
                            // We only do this automatically if the window can resize
                            // to accommodate the IME (so what the user sees will give
                            // them good context without input information being obscured
                            // by the IME) or if running on a large screen where there
                            // is more room for the target window + IME.
                            if (DEBUG) Slog.v(TAG, "Unspecified window will show input");
                            if (attribute != null) {
                                res = startInputUncheckedLocked(cs, inputContext,
                                        missingMethods, attribute, controlFlags, startInputReason);
                                didStart = true;
                            }
                            showCurrentInputLocked(InputMethodManager.SHOW_IMPLICIT, null);
                        }
                        break;
                    case WindowManager.LayoutParams.SOFT_INPUT_STATE_UNCHANGED:
                        // Do nothing.
                        break;
                    case WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN:
                        if ((softInputMode &
                                WindowManager.LayoutParams.SOFT_INPUT_IS_FORWARD_NAVIGATION) != 0) {
                            if (DEBUG) Slog.v(TAG, "Window asks to hide input going forward");
                            hideCurrentInputLocked(0, null);
                        }
                        break;
                    case WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN:
                        if (DEBUG) Slog.v(TAG, "Window asks to hide input");
                        hideCurrentInputLocked(0, null);
                        break;
                    case WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE:
                        if ((softInputMode &
                                WindowManager.LayoutParams.SOFT_INPUT_IS_FORWARD_NAVIGATION) != 0) {
                            if (DEBUG) Slog.v(TAG, "Window asks to show input going forward");
                            if (attribute != null) {
                                res = startInputUncheckedLocked(cs, inputContext,
                                        missingMethods, attribute, controlFlags, startInputReason);
                                didStart = true;
                            }
                            showCurrentInputLocked(InputMethodManager.SHOW_IMPLICIT, null);
                        }
                        break;
                    case WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE:
                        if (DEBUG) Slog.v(TAG, "Window asks to always show input");
                        if (attribute != null) {
                            res = startInputUncheckedLocked(cs, inputContext, missingMethods,
                                    attribute, controlFlags, startInputReason);
                            didStart = true;
                        }
                        showCurrentInputLocked(InputMethodManager.SHOW_IMPLICIT, null);
                        break;
                }

                if (!didStart && attribute != null) {
                    res = startInputUncheckedLocked(cs, inputContext, missingMethods, attribute,
                            controlFlags, startInputReason);
                }
            }
        } finally {
            Binder.restoreCallingIdentity(ident);
        }

        return res;
    }

    @Override
    public void showInputMethodPickerFromClient(
            IInputMethodClient client, int auxiliarySubtypeMode) {
        if (!calledFromValidUser()) {
            return;
        }
        synchronized (mMethodMap) {
            if (mCurClient == null || client == null
                    || mCurClient.client.asBinder() != client.asBinder()) {
                Slog.w(TAG, "Ignoring showInputMethodPickerFromClient of uid "
                        + Binder.getCallingUid() + ": " + client);
            }

            // Always call subtype picker, because subtype picker is a superset of input method
            // picker.
            mHandler.sendMessage(mCaller.obtainMessageI(
                    MSG_SHOW_IM_SUBTYPE_PICKER, auxiliarySubtypeMode));
        }
    }

    @Override
    public void setInputMethod(IBinder token, String id) {
        if (!calledFromValidUser()) {
            return;
        }
        setInputMethodWithSubtypeId(token, id, NOT_A_SUBTYPE_ID);
    }

    @Override
    public void setInputMethodAndSubtype(IBinder token, String id, InputMethodSubtype subtype) {
        if (!calledFromValidUser()) {
            return;
        }
        synchronized (mMethodMap) {
            if (subtype != null) {
                setInputMethodWithSubtypeIdLocked(token, id,
                        InputMethodUtils.getSubtypeIdFromHashCode(mMethodMap.get(id),
                                subtype.hashCode()));
            } else {
                setInputMethod(token, id);
            }
        }
    }

    @Override
    public void showInputMethodAndSubtypeEnablerFromClient(
            IInputMethodClient client, String inputMethodId) {
        if (!calledFromValidUser()) {
            return;
        }
        synchronized (mMethodMap) {
            executeOrSendMessage(mCurMethod, mCaller.obtainMessageO(
                    MSG_SHOW_IM_SUBTYPE_ENABLER, inputMethodId));
        }
    }

    @Override
    public boolean switchToLastInputMethod(IBinder token) {
        if (!calledFromValidUser()) {
            return false;
        }
        synchronized (mMethodMap) {
            final Pair<String, String> lastIme = mSettings.getLastInputMethodAndSubtypeLocked();
            final InputMethodInfo lastImi;
            if (lastIme != null) {
                lastImi = mMethodMap.get(lastIme.first);
            } else {
                lastImi = null;
            }
            String targetLastImiId = null;
            int subtypeId = NOT_A_SUBTYPE_ID;
            if (lastIme != null && lastImi != null) {
                final boolean imiIdIsSame = lastImi.getId().equals(mCurMethodId);
                final int lastSubtypeHash = Integer.parseInt(lastIme.second);
                final int currentSubtypeHash = mCurrentSubtype == null ? NOT_A_SUBTYPE_ID
                        : mCurrentSubtype.hashCode();
                // If the last IME is the same as the current IME and the last subtype is not
                // defined, there is no need to switch to the last IME.
                if (!imiIdIsSame || lastSubtypeHash != currentSubtypeHash) {
                    targetLastImiId = lastIme.first;
                    subtypeId = InputMethodUtils.getSubtypeIdFromHashCode(lastImi, lastSubtypeHash);
                }
            }

            if (TextUtils.isEmpty(targetLastImiId)
                    && !InputMethodUtils.canAddToLastInputMethod(mCurrentSubtype)) {
                // This is a safety net. If the currentSubtype can't be added to the history
                // and the framework couldn't find the last ime, we will make the last ime be
                // the most applicable enabled keyboard subtype of the system imes.
                final List<InputMethodInfo> enabled = mSettings.getEnabledInputMethodListLocked();
                if (enabled != null) {
                    final int N = enabled.size();
                    final String locale = mCurrentSubtype == null
                            ? mRes.getConfiguration().locale.toString()
                            : mCurrentSubtype.getLocale();
                    for (int i = 0; i < N; ++i) {
                        final InputMethodInfo imi = enabled.get(i);
                        if (imi.getSubtypeCount() > 0 && InputMethodUtils.isSystemIme(imi)) {
                            InputMethodSubtype keyboardSubtype =
                                    InputMethodUtils.findLastResortApplicableSubtypeLocked(mRes,
                                            InputMethodUtils.getSubtypes(imi),
                                            InputMethodUtils.SUBTYPE_MODE_KEYBOARD, locale, true);
                            if (keyboardSubtype != null) {
                                targetLastImiId = imi.getId();
                                subtypeId = InputMethodUtils.getSubtypeIdFromHashCode(
                                        imi, keyboardSubtype.hashCode());
                                if(keyboardSubtype.getLocale().equals(locale)) {
                                    break;
                                }
                            }
                        }
                    }
                }
            }

            if (!TextUtils.isEmpty(targetLastImiId)) {
                if (DEBUG) {
                    Slog.d(TAG, "Switch to: " + lastImi.getId() + ", " + lastIme.second
                            + ", from: " + mCurMethodId + ", " + subtypeId);
                }
                setInputMethodWithSubtypeIdLocked(token, targetLastImiId, subtypeId);
                return true;
            } else {
                return false;
            }
        }
    }

    @Override
    public boolean switchToNextInputMethod(IBinder token, boolean onlyCurrentIme) {
        if (!calledFromValidUser()) {
            return false;
        }
        synchronized (mMethodMap) {
            if (!calledWithValidToken(token)) {
                return false;
            }
            final ImeSubtypeListItem nextSubtype = mSwitchingController.getNextInputMethodLocked(
                    onlyCurrentIme, mMethodMap.get(mCurMethodId), mCurrentSubtype,
                    true /* forward */);
            if (nextSubtype == null) {
                return false;
            }
            setInputMethodWithSubtypeIdLocked(token, nextSubtype.mImi.getId(),
                    nextSubtype.mSubtypeId);
            return true;
        }
    }

    @Override
    public boolean shouldOfferSwitchingToNextInputMethod(IBinder token) {
        if (!calledFromValidUser()) {
            return false;
        }
        synchronized (mMethodMap) {
            if (!calledWithValidToken(token)) {
                return false;
            }
            final ImeSubtypeListItem nextSubtype = mSwitchingController.getNextInputMethodLocked(
                    false /* onlyCurrentIme */, mMethodMap.get(mCurMethodId), mCurrentSubtype,
                    true /* forward */);
            if (nextSubtype == null) {
                return false;
            }
            return true;
        }
    }

    @Override
    public InputMethodSubtype getLastInputMethodSubtype() {
        if (!calledFromValidUser()) {
            return null;
        }
        synchronized (mMethodMap) {
            final Pair<String, String> lastIme = mSettings.getLastInputMethodAndSubtypeLocked();
            // TODO: Handle the case of the last IME with no subtypes
            if (lastIme == null || TextUtils.isEmpty(lastIme.first)
                    || TextUtils.isEmpty(lastIme.second)) return null;
            final InputMethodInfo lastImi = mMethodMap.get(lastIme.first);
            if (lastImi == null) return null;
            try {
                final int lastSubtypeHash = Integer.parseInt(lastIme.second);
                final int lastSubtypeId =
                        InputMethodUtils.getSubtypeIdFromHashCode(lastImi, lastSubtypeHash);
                if (lastSubtypeId < 0 || lastSubtypeId >= lastImi.getSubtypeCount()) {
                    return null;
                }
                return lastImi.getSubtypeAt(lastSubtypeId);
            } catch (NumberFormatException e) {
                return null;
            }
        }
    }

    @Override
    public void setAdditionalInputMethodSubtypes(String imiId, InputMethodSubtype[] subtypes) {
        if (!calledFromValidUser()) {
            return;
        }
        // By this IPC call, only a process which shares the same uid with the IME can add
        // additional input method subtypes to the IME.
        if (TextUtils.isEmpty(imiId) || subtypes == null) return;
        synchronized (mMethodMap) {
            if (!mSystemReady) {
                return;
            }
            final InputMethodInfo imi = mMethodMap.get(imiId);
            if (imi == null) return;
            final String[] packageInfos;
            try {
                packageInfos = mIPackageManager.getPackagesForUid(Binder.getCallingUid());
            } catch (RemoteException e) {
                Slog.e(TAG, "Failed to get package infos");
                return;
            }
            if (packageInfos != null) {
                final int packageNum = packageInfos.length;
                for (int i = 0; i < packageNum; ++i) {
                    if (packageInfos[i].equals(imi.getPackageName())) {
                        mFileManager.addInputMethodSubtypes(imi, subtypes);
                        final long ident = Binder.clearCallingIdentity();
                        try {
                            buildInputMethodListLocked(false /* resetDefaultEnabledIme */);
                        } finally {
                            Binder.restoreCallingIdentity(ident);
                        }
                        return;
                    }
                }
            }
        }
        return;
    }

    @Override
    public int getInputMethodWindowVisibleHeight() {
        return mWindowManagerInternal.getInputMethodWindowVisibleHeight();
    }

    @Override
    public void clearLastInputMethodWindowForTransition(IBinder token) {
        if (!calledFromValidUser()) {
            return;
        }
        synchronized (mMethodMap) {
            if (!calledWithValidToken(token)) {
                return;
            }
        }
        mWindowManagerInternal.clearLastInputMethodWindowForTransition();
    }

    @Override
    public void notifyUserAction(int sequenceNumber) {
        if (DEBUG) {
            Slog.d(TAG, "Got the notification of a user action. sequenceNumber:" + sequenceNumber);
        }
        synchronized (mMethodMap) {
            if (mCurUserActionNotificationSequenceNumber != sequenceNumber) {
                if (DEBUG) {
                    Slog.d(TAG, "Ignoring the user action notification due to the sequence number "
                            + "mismatch. expected:" + mCurUserActionNotificationSequenceNumber
                            + " actual: " + sequenceNumber);
                }
                return;
            }
            final InputMethodInfo imi = mMethodMap.get(mCurMethodId);
            if (imi != null) {
                mSwitchingController.onUserActionLocked(imi, mCurrentSubtype);
            }
        }
    }

    private void setInputMethodWithSubtypeId(IBinder token, String id, int subtypeId) {
        synchronized (mMethodMap) {
            setInputMethodWithSubtypeIdLocked(token, id, subtypeId);
        }
    }

    private void setInputMethodWithSubtypeIdLocked(IBinder token, String id, int subtypeId) {
        if (token == null) {
            if (mContext.checkCallingOrSelfPermission(
                    android.Manifest.permission.WRITE_SECURE_SETTINGS)
                    != PackageManager.PERMISSION_GRANTED) {
                throw new SecurityException(
                        "Using null token requires permission "
                        + android.Manifest.permission.WRITE_SECURE_SETTINGS);
            }
        } else if (mCurToken != token) {
            Slog.w(TAG, "Ignoring setInputMethod of uid " + Binder.getCallingUid()
                    + " token: " + token);
            return;
        }

        final long ident = Binder.clearCallingIdentity();
        try {
            setInputMethodLocked(id, subtypeId);
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
    }

    @Override
    public void hideMySoftInput(IBinder token, int flags) {
        if (!calledFromValidUser()) {
            return;
        }
        synchronized (mMethodMap) {
            if (!calledWithValidToken(token)) {
                return;
            }
            long ident = Binder.clearCallingIdentity();
            try {
                hideCurrentInputLocked(flags, null);
            } finally {
                Binder.restoreCallingIdentity(ident);
            }
        }
    }

    @Override
    public void showMySoftInput(IBinder token, int flags) {
        if (!calledFromValidUser()) {
            return;
        }
        synchronized (mMethodMap) {
            if (!calledWithValidToken(token)) {
                return;
            }
            long ident = Binder.clearCallingIdentity();
            try {
                showCurrentInputLocked(flags, null);
            } finally {
                Binder.restoreCallingIdentity(ident);
            }
        }
    }

    void setEnabledSessionInMainThread(SessionState session) {
        if (mEnabledSession != session) {
            if (mEnabledSession != null && mEnabledSession.session != null) {
                try {
                    if (DEBUG) Slog.v(TAG, "Disabling: " + mEnabledSession);
                    mEnabledSession.method.setSessionEnabled(mEnabledSession.session, false);
                } catch (RemoteException e) {
                }
            }
            mEnabledSession = session;
            if (mEnabledSession != null && mEnabledSession.session != null) {
                try {
                    if (DEBUG) Slog.v(TAG, "Enabling: " + mEnabledSession);
                    mEnabledSession.method.setSessionEnabled(mEnabledSession.session, true);
                } catch (RemoteException e) {
                }
            }
        }
    }

    @Override
    public boolean handleMessage(Message msg) {
        SomeArgs args;
        switch (msg.what) {
            case MSG_SHOW_IM_SUBTYPE_PICKER:
                final boolean showAuxSubtypes;
                switch (msg.arg1) {
                    case InputMethodManager.SHOW_IM_PICKER_MODE_AUTO:
                        // This is undocumented so far, but IMM#showInputMethodPicker() has been
                        // implemented so that auxiliary subtypes will be excluded when the soft
                        // keyboard is invisible.
                        showAuxSubtypes = mInputShown;
                        break;
                    case InputMethodManager.SHOW_IM_PICKER_MODE_INCLUDE_AUXILIARY_SUBTYPES:
                        showAuxSubtypes = true;
                        break;
                    case InputMethodManager.SHOW_IM_PICKER_MODE_EXCLUDE_AUXILIARY_SUBTYPES:
                        showAuxSubtypes = false;
                        break;
                    default:
                        Slog.e(TAG, "Unknown subtype picker mode = " + msg.arg1);
                        return false;
                }
                showInputMethodMenu(showAuxSubtypes);
                return true;

            case MSG_SHOW_IM_SUBTYPE_ENABLER:
                showInputMethodAndSubtypeEnabler((String)msg.obj);
                return true;

            case MSG_SHOW_IM_CONFIG:
                showConfigureInputMethods();
                return true;

            // ---------------------------------------------------------

            case MSG_UNBIND_INPUT:
                try {
                    ((IInputMethod)msg.obj).unbindInput();
                } catch (RemoteException e) {
                    // There is nothing interesting about the method dying.
                }
                return true;
            case MSG_BIND_INPUT:
                args = (SomeArgs)msg.obj;
                try {
                    ((IInputMethod)args.arg1).bindInput((InputBinding)args.arg2);
                } catch (RemoteException e) {
                }
                args.recycle();
                return true;
            case MSG_SHOW_SOFT_INPUT:
                args = (SomeArgs)msg.obj;
                try {
                    if (DEBUG) Slog.v(TAG, "Calling " + args.arg1 + ".showSoftInput("
                            + msg.arg1 + ", " + args.arg2 + ")");
                    ((IInputMethod)args.arg1).showSoftInput(msg.arg1, (ResultReceiver)args.arg2);
                } catch (RemoteException e) {
                }
                args.recycle();
                return true;
            case MSG_HIDE_SOFT_INPUT:
                args = (SomeArgs)msg.obj;
                try {
                    if (DEBUG) Slog.v(TAG, "Calling " + args.arg1 + ".hideSoftInput(0, "
                            + args.arg2 + ")");
                    ((IInputMethod)args.arg1).hideSoftInput(0, (ResultReceiver)args.arg2);
                } catch (RemoteException e) {
                }
                args.recycle();
                return true;
            case MSG_HIDE_CURRENT_INPUT_METHOD:
                synchronized (mMethodMap) {
                    hideCurrentInputLocked(0, null);
                }
                return true;
            case MSG_ATTACH_TOKEN:
                args = (SomeArgs)msg.obj;
                try {
                    if (DEBUG) Slog.v(TAG, "Sending attach of token: " + args.arg2);
                    ((IInputMethod)args.arg1).attachToken((IBinder)args.arg2);
                } catch (RemoteException e) {
                }
                args.recycle();
                return true;
            case MSG_CREATE_SESSION: {
                args = (SomeArgs)msg.obj;
                IInputMethod method = (IInputMethod)args.arg1;
                InputChannel channel = (InputChannel)args.arg2;
                try {
                    method.createSession(channel, (IInputSessionCallback)args.arg3);
                } catch (RemoteException e) {
                } finally {
                    // Dispose the channel if the input method is not local to this process
                    // because the remote proxy will get its own copy when unparceled.
                    if (channel != null && Binder.isProxy(method)) {
                        channel.dispose();
                    }
                }
                args.recycle();
                return true;
            }
            // ---------------------------------------------------------

            case MSG_START_INPUT: {
                final int missingMethods = msg.arg1;
                final boolean restarting = msg.arg2 != 0;
                args = (SomeArgs) msg.obj;
                final IBinder startInputToken = (IBinder) args.arg1;
                final SessionState session = (SessionState) args.arg2;
                final IInputContext inputContext = (IInputContext) args.arg3;
                final EditorInfo editorInfo = (EditorInfo) args.arg4;
                try {
                    setEnabledSessionInMainThread(session);
                    session.method.startInput(startInputToken, inputContext, missingMethods,
                            editorInfo, restarting);
                } catch (RemoteException e) {
                }
                args.recycle();
                return true;
            }

            // ---------------------------------------------------------

            case MSG_UNBIND_CLIENT:
                try {
                    ((IInputMethodClient)msg.obj).onUnbindMethod(msg.arg1, msg.arg2);
                } catch (RemoteException e) {
                    // There is nothing interesting about the last client dying.
                }
                return true;
            case MSG_BIND_CLIENT: {
                args = (SomeArgs)msg.obj;
                IInputMethodClient client = (IInputMethodClient)args.arg1;
                InputBindResult res = (InputBindResult)args.arg2;
                try {
                    client.onBindMethod(res);
                } catch (RemoteException e) {
                    Slog.w(TAG, "Client died receiving input method " + args.arg2);
                } finally {
                    // Dispose the channel if the input method is not local to this process
                    // because the remote proxy will get its own copy when unparceled.
                    if (res.channel != null && Binder.isProxy(client)) {
                        res.channel.dispose();
                    }
                }
                args.recycle();
                return true;
            }
            case MSG_SET_ACTIVE:
                try {
                    ((ClientState)msg.obj).client.setActive(msg.arg1 != 0, msg.arg2 != 0);
                } catch (RemoteException e) {
                    Slog.w(TAG, "Got RemoteException sending setActive(false) notification to pid "
                            + ((ClientState)msg.obj).pid + " uid "
                            + ((ClientState)msg.obj).uid);
                }
                return true;
            case MSG_SET_INTERACTIVE:
                handleSetInteractive(msg.arg1 != 0);
                return true;
            case MSG_SWITCH_IME:
                handleSwitchInputMethod(msg.arg1 != 0);
                return true;
            case MSG_SET_USER_ACTION_NOTIFICATION_SEQUENCE_NUMBER: {
                final int sequenceNumber = msg.arg1;
                final ClientState clientState = (ClientState)msg.obj;
                try {
                    clientState.client.setUserActionNotificationSequenceNumber(sequenceNumber);
                } catch (RemoteException e) {
                    Slog.w(TAG, "Got RemoteException sending "
                            + "setUserActionNotificationSequenceNumber("
                            + sequenceNumber + ") notification to pid "
                            + clientState.pid + " uid "
                            + clientState.uid);
                }
                return true;
            }
            case MSG_REPORT_FULLSCREEN_MODE: {
                final boolean fullscreen = msg.arg1 != 0;
                final ClientState clientState = (ClientState)msg.obj;
                try {
                    clientState.client.reportFullscreenMode(fullscreen);
                } catch (RemoteException e) {
                    Slog.w(TAG, "Got RemoteException sending "
                            + "reportFullscreen(" + fullscreen + ") notification to pid="
                            + clientState.pid + " uid=" + clientState.uid);
                }
                return true;
            }

            // --------------------------------------------------------------
            case MSG_HARD_KEYBOARD_SWITCH_CHANGED:
                mHardKeyboardListener.handleHardKeyboardStatusChange(msg.arg1 == 1);
                return true;
            case MSG_SYSTEM_UNLOCK_USER:
                final int userId = msg.arg1;
                onUnlockUser(userId);
                return true;
        }
        return false;
    }

    private void handleSetInteractive(final boolean interactive) {
        synchronized (mMethodMap) {
            mIsInteractive = interactive;
            updateSystemUiLocked(mCurToken, interactive ? mImeWindowVis : 0, mBackDisposition);

            // Inform the current client of the change in active status
            if (mCurClient != null && mCurClient.client != null) {
                executeOrSendMessage(mCurClient.client, mCaller.obtainMessageIIO(
                        MSG_SET_ACTIVE, mIsInteractive ? 1 : 0, mInFullscreenMode ? 1 : 0,
                        mCurClient));
            }
        }
    }

    private void handleSwitchInputMethod(final boolean forwardDirection) {
        synchronized (mMethodMap) {
            final ImeSubtypeListItem nextSubtype = mSwitchingController.getNextInputMethodLocked(
                    false, mMethodMap.get(mCurMethodId), mCurrentSubtype, forwardDirection);
            if (nextSubtype == null) {
                return;
            }
            setInputMethodLocked(nextSubtype.mImi.getId(), nextSubtype.mSubtypeId);
            final InputMethodInfo newInputMethodInfo = mMethodMap.get(mCurMethodId);
            if (newInputMethodInfo == null) {
                return;
            }
            final CharSequence toastText = InputMethodUtils.getImeAndSubtypeDisplayName(mContext,
                    newInputMethodInfo, mCurrentSubtype);
            if (!TextUtils.isEmpty(toastText)) {
                if (mSubtypeSwitchedByShortCutToast == null) {
                    mSubtypeSwitchedByShortCutToast = Toast.makeText(mContext, toastText,
                            Toast.LENGTH_SHORT);
                } else {
                    mSubtypeSwitchedByShortCutToast.setText(toastText);
                }
                mSubtypeSwitchedByShortCutToast.show();
            }
        }
    }

    private boolean chooseNewDefaultIMELocked() {
        final InputMethodInfo imi = InputMethodUtils.getMostApplicableDefaultIME(
                mSettings.getEnabledInputMethodListLocked());
        if (imi != null) {
            if (DEBUG) {
                Slog.d(TAG, "New default IME was selected: " + imi.getId());
            }
            resetSelectedInputMethodAndSubtypeLocked(imi.getId());
            return true;
        }

        return false;
    }

    void buildInputMethodListLocked(boolean resetDefaultEnabledIme) {
        if (DEBUG) {
            Slog.d(TAG, "--- re-buildInputMethodList reset = " + resetDefaultEnabledIme
                    + " \n ------ caller=" + Debug.getCallers(10));
        }
        if (!mSystemReady) {
            Slog.e(TAG, "buildInputMethodListLocked is not allowed until system is ready");
            return;
        }
        mMethodList.clear();
        mMethodMap.clear();
        mMethodMapUpdateCount++;
        mMyPackageMonitor.clearPackagesToMonitorComponentChangeLocked();

        // Use for queryIntentServicesAsUser
        final PackageManager pm = mContext.getPackageManager();

        // Note: We do not specify PackageManager.MATCH_ENCRYPTION_* flags here because the default
        // behavior of PackageManager is exactly what we want.  It by default picks up appropriate
        // services depending on the unlock state for the specified user.
        final List<ResolveInfo> services = pm.queryIntentServicesAsUser(
                new Intent(InputMethod.SERVICE_INTERFACE),
                PackageManager.GET_META_DATA | PackageManager.GET_DISABLED_UNTIL_USED_COMPONENTS,
                mSettings.getCurrentUserId());

        final HashMap<String, List<InputMethodSubtype>> additionalSubtypeMap =
                mFileManager.getAllAdditionalInputMethodSubtypes();
        for (int i = 0; i < services.size(); ++i) {
            ResolveInfo ri = services.get(i);
            ServiceInfo si = ri.serviceInfo;
            final String imeId = InputMethodInfo.computeId(ri);
            if (!android.Manifest.permission.BIND_INPUT_METHOD.equals(si.permission)) {
                Slog.w(TAG, "Skipping input method " + imeId
                        + ": it does not require the permission "
                        + android.Manifest.permission.BIND_INPUT_METHOD);
                continue;
            }

            if (DEBUG) Slog.d(TAG, "Checking " + imeId);

            final List<InputMethodSubtype> additionalSubtypes = additionalSubtypeMap.get(imeId);
            try {
                InputMethodInfo p = new InputMethodInfo(mContext, ri, additionalSubtypes);
                mMethodList.add(p);
                final String id = p.getId();
                mMethodMap.put(id, p);

                if (DEBUG) {
                    Slog.d(TAG, "Found an input method " + p);
                }
            } catch (Exception e) {
                Slog.wtf(TAG, "Unable to load input method " + imeId, e);
            }
        }

        // Construct the set of possible IME packages for onPackageChanged() to avoid false
        // negatives when the package state remains to be the same but only the component state is
        // changed.
        {
            // Here we intentionally use PackageManager.MATCH_DISABLED_COMPONENTS since the purpose
            // of this query is to avoid false negatives.  PackageManager.MATCH_ALL could be more
            // conservative, but it seems we cannot use it for now (Issue 35176630).
            final List<ResolveInfo> allInputMethodServices = pm.queryIntentServicesAsUser(
                    new Intent(InputMethod.SERVICE_INTERFACE),
                    PackageManager.MATCH_DISABLED_COMPONENTS, mSettings.getCurrentUserId());
            final int N = allInputMethodServices.size();
            for (int i = 0; i < N; ++i) {
                final ServiceInfo si = allInputMethodServices.get(i).serviceInfo;
                if (!android.Manifest.permission.BIND_INPUT_METHOD.equals(si.permission)) {
                    continue;
                }
                mMyPackageMonitor.addPackageToMonitorComponentChangeLocked(si.packageName);
            }
        }

        // TODO: The following code should find better place to live.
        if (!resetDefaultEnabledIme) {
            boolean enabledImeFound = false;
            final List<InputMethodInfo> enabledImes = mSettings.getEnabledInputMethodListLocked();
            final int N = enabledImes.size();
            for (int i = 0; i < N; ++i) {
                final InputMethodInfo imi = enabledImes.get(i);
                if (mMethodList.contains(imi)) {
                    enabledImeFound = true;
                    break;
                }
            }
            if (!enabledImeFound) {
                if (DEBUG) {
                    Slog.i(TAG, "All the enabled IMEs are gone. Reset default enabled IMEs.");
                }
                resetDefaultEnabledIme = true;
                resetSelectedInputMethodAndSubtypeLocked("");
            }
        }

        if (resetDefaultEnabledIme) {
            final ArrayList<InputMethodInfo> defaultEnabledIme =
                    InputMethodUtils.getDefaultEnabledImes(mContext, mMethodList);
            final int N = defaultEnabledIme.size();
            for (int i = 0; i < N; ++i) {
                final InputMethodInfo imi =  defaultEnabledIme.get(i);
                if (DEBUG) {
                    Slog.d(TAG, "--- enable ime = " + imi);
                }
                setInputMethodEnabledLocked(imi.getId(), true);
            }
        }

        final String defaultImiId = mSettings.getSelectedInputMethod();
        if (!TextUtils.isEmpty(defaultImiId)) {
            if (!mMethodMap.containsKey(defaultImiId)) {
                Slog.w(TAG, "Default IME is uninstalled. Choose new default IME.");
                if (chooseNewDefaultIMELocked()) {
                    updateInputMethodsFromSettingsLocked(true);
                }
            } else {
                // Double check that the default IME is certainly enabled.
                setInputMethodEnabledLocked(defaultImiId, true);
            }
        }
        // Here is not the perfect place to reset the switching controller. Ideally
        // mSwitchingController and mSettings should be able to share the same state.
        // TODO: Make sure that mSwitchingController and mSettings are sharing the
        // the same enabled IMEs list.
        mSwitchingController.resetCircularListLocked(mContext);
    }

    // ----------------------------------------------------------------------

    private void showInputMethodAndSubtypeEnabler(String inputMethodId) {
        Intent intent = new Intent(Settings.ACTION_INPUT_METHOD_SUBTYPE_SETTINGS);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
                | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED
                | Intent.FLAG_ACTIVITY_CLEAR_TOP);
        if (!TextUtils.isEmpty(inputMethodId)) {
            intent.putExtra(Settings.EXTRA_INPUT_METHOD_ID, inputMethodId);
        }
        final int userId;
        synchronized (mMethodMap) {
            userId = mSettings.getCurrentUserId();
        }
        mContext.startActivityAsUser(intent, null, UserHandle.of(userId));
    }

    private void showConfigureInputMethods() {
        Intent intent = new Intent(Settings.ACTION_INPUT_METHOD_SETTINGS);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
                | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED
                | Intent.FLAG_ACTIVITY_CLEAR_TOP);
        mContext.startActivityAsUser(intent, null, UserHandle.CURRENT);
    }

    private boolean isScreenLocked() {
        return mKeyguardManager != null
                && mKeyguardManager.isKeyguardLocked() && mKeyguardManager.isKeyguardSecure();
    }

    private void showInputMethodMenu(boolean showAuxSubtypes) {
        if (DEBUG) Slog.v(TAG, "Show switching menu. showAuxSubtypes=" + showAuxSubtypes);

        final Context context = mContext;
        final boolean isScreenLocked = isScreenLocked();

        final String lastInputMethodId = mSettings.getSelectedInputMethod();
        int lastInputMethodSubtypeId = mSettings.getSelectedInputMethodSubtypeId(lastInputMethodId);
        if (DEBUG) Slog.v(TAG, "Current IME: " + lastInputMethodId);

        synchronized (mMethodMap) {
            final HashMap<InputMethodInfo, List<InputMethodSubtype>> immis =
                    mSettings.getExplicitlyOrImplicitlyEnabledInputMethodsAndSubtypeListLocked(
                            mContext);
            if (immis == null || immis.size() == 0) {
                return;
            }

            hideInputMethodMenuLocked();

            final List<ImeSubtypeListItem> imList =
                    mSwitchingController.getSortedInputMethodAndSubtypeListLocked(
                            showAuxSubtypes, isScreenLocked);

            if (lastInputMethodSubtypeId == NOT_A_SUBTYPE_ID) {
                final InputMethodSubtype currentSubtype = getCurrentInputMethodSubtypeLocked();
                if (currentSubtype != null) {
                    final InputMethodInfo currentImi = mMethodMap.get(mCurMethodId);
                    lastInputMethodSubtypeId = InputMethodUtils.getSubtypeIdFromHashCode(
                            currentImi, currentSubtype.hashCode());
                }
            }

            final int N = imList.size();
            mIms = new InputMethodInfo[N];
            mSubtypeIds = new int[N];
            int checkedItem = 0;
            for (int i = 0; i < N; ++i) {
                final ImeSubtypeListItem item = imList.get(i);
                mIms[i] = item.mImi;
                mSubtypeIds[i] = item.mSubtypeId;
                if (mIms[i].getId().equals(lastInputMethodId)) {
                    int subtypeId = mSubtypeIds[i];
                    if ((subtypeId == NOT_A_SUBTYPE_ID)
                            || (lastInputMethodSubtypeId == NOT_A_SUBTYPE_ID && subtypeId == 0)
                            || (subtypeId == lastInputMethodSubtypeId)) {
                        checkedItem = i;
                    }
                }
            }

            final Context settingsContext = new ContextThemeWrapper(context,
                    com.android.internal.R.style.Theme_DeviceDefault_Settings);

            mDialogBuilder = new AlertDialog.Builder(settingsContext);
            mDialogBuilder.setOnCancelListener(new OnCancelListener() {
                @Override
                public void onCancel(DialogInterface dialog) {
                    hideInputMethodMenu();
                }
            });

            final Context dialogContext = mDialogBuilder.getContext();
            final TypedArray a = dialogContext.obtainStyledAttributes(null,
                    com.android.internal.R.styleable.DialogPreference,
                    com.android.internal.R.attr.alertDialogStyle, 0);
            final Drawable dialogIcon = a.getDrawable(
                    com.android.internal.R.styleable.DialogPreference_dialogIcon);
            a.recycle();

            mDialogBuilder.setIcon(dialogIcon);

            final LayoutInflater inflater = dialogContext.getSystemService(LayoutInflater.class);
            final View tv = inflater.inflate(
                    com.android.internal.R.layout.input_method_switch_dialog_title, null);
            mDialogBuilder.setCustomTitle(tv);

            // Setup layout for a toggle switch of the hardware keyboard
            mSwitchingDialogTitleView = tv;
            mSwitchingDialogTitleView
                    .findViewById(com.android.internal.R.id.hard_keyboard_section)
                    .setVisibility(mWindowManagerInternal.isHardKeyboardAvailable()
                            ? View.VISIBLE : View.GONE);
            final Switch hardKeySwitch = (Switch) mSwitchingDialogTitleView.findViewById(
                    com.android.internal.R.id.hard_keyboard_switch);
            hardKeySwitch.setChecked(mShowImeWithHardKeyboard);
            hardKeySwitch.setOnCheckedChangeListener(new OnCheckedChangeListener() {
                @Override
                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                    mSettings.setShowImeWithHardKeyboard(isChecked);
                    // Ensure that the input method dialog is dismissed when changing
                    // the hardware keyboard state.
                    hideInputMethodMenu();
                }
            });

            final ImeSubtypeListAdapter adapter = new ImeSubtypeListAdapter(dialogContext,
                    com.android.internal.R.layout.input_method_switch_item, imList, checkedItem);
            final OnClickListener choiceListener = new OnClickListener() {
                @Override
                public void onClick(final DialogInterface dialog, final int which) {
                    synchronized (mMethodMap) {
                        if (mIms == null || mIms.length <= which || mSubtypeIds == null
                                || mSubtypeIds.length <= which) {
                            return;
                        }
                        final InputMethodInfo im = mIms[which];
                        int subtypeId = mSubtypeIds[which];
                        adapter.mCheckedItem = which;
                        adapter.notifyDataSetChanged();
                        hideInputMethodMenu();
                        if (im != null) {
                            if (subtypeId < 0 || subtypeId >= im.getSubtypeCount()) {
                                subtypeId = NOT_A_SUBTYPE_ID;
                            }
                            setInputMethodLocked(im.getId(), subtypeId);
                        }
                    }
                }
            };
            mDialogBuilder.setSingleChoiceItems(adapter, checkedItem, choiceListener);

            mSwitchingDialog = mDialogBuilder.create();
            mSwitchingDialog.setCanceledOnTouchOutside(true);
            final Window w = mSwitchingDialog.getWindow();
            final WindowManager.LayoutParams attrs = w.getAttributes();
            w.setType(TYPE_INPUT_METHOD_DIALOG);
            // Use an alternate token for the dialog for that window manager can group the token
            // with other IME windows based on type vs. grouping based on whichever token happens
            // to get selected by the system later on.
            attrs.token = mSwitchingDialogToken;
            attrs.privateFlags |= PRIVATE_FLAG_SHOW_FOR_ALL_USERS;
            attrs.setTitle("Select input method");
            w.setAttributes(attrs);
            updateSystemUi(mCurToken, mImeWindowVis, mBackDisposition);
            mSwitchingDialog.show();
        }
    }

    private static class ImeSubtypeListAdapter extends ArrayAdapter<ImeSubtypeListItem> {
        private final LayoutInflater mInflater;
        private final int mTextViewResourceId;
        private final List<ImeSubtypeListItem> mItemsList;
        public int mCheckedItem;
        public ImeSubtypeListAdapter(Context context, int textViewResourceId,
                List<ImeSubtypeListItem> itemsList, int checkedItem) {
            super(context, textViewResourceId, itemsList);

            mTextViewResourceId = textViewResourceId;
            mItemsList = itemsList;
            mCheckedItem = checkedItem;
            mInflater = context.getSystemService(LayoutInflater.class);
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            final View view = convertView != null ? convertView
                    : mInflater.inflate(mTextViewResourceId, null);
            if (position < 0 || position >= mItemsList.size()) return view;
            final ImeSubtypeListItem item = mItemsList.get(position);
            final CharSequence imeName = item.mImeName;
            final CharSequence subtypeName = item.mSubtypeName;
            final TextView firstTextView = (TextView)view.findViewById(android.R.id.text1);
            final TextView secondTextView = (TextView)view.findViewById(android.R.id.text2);
            if (TextUtils.isEmpty(subtypeName)) {
                firstTextView.setText(imeName);
                secondTextView.setVisibility(View.GONE);
            } else {
                firstTextView.setText(subtypeName);
                secondTextView.setText(imeName);
                secondTextView.setVisibility(View.VISIBLE);
            }
            final RadioButton radioButton =
                    (RadioButton)view.findViewById(com.android.internal.R.id.radio);
            radioButton.setChecked(position == mCheckedItem);
            return view;
        }
    }

    void hideInputMethodMenu() {
        synchronized (mMethodMap) {
            hideInputMethodMenuLocked();
        }
    }

    void hideInputMethodMenuLocked() {
        if (DEBUG) Slog.v(TAG, "Hide switching menu");

        if (mSwitchingDialog != null) {
            mSwitchingDialog.dismiss();
            mSwitchingDialog = null;
        }

        updateSystemUiLocked(mCurToken, mImeWindowVis, mBackDisposition);
        mDialogBuilder = null;
        mIms = null;
    }

    // ----------------------------------------------------------------------

    @Override
    public boolean setInputMethodEnabled(String id, boolean enabled) {
        // TODO: Make this work even for non-current users?
        if (!calledFromValidUser()) {
            return false;
        }
        synchronized (mMethodMap) {
            if (mContext.checkCallingOrSelfPermission(
                    android.Manifest.permission.WRITE_SECURE_SETTINGS)
                    != PackageManager.PERMISSION_GRANTED) {
                throw new SecurityException(
                        "Requires permission "
                        + android.Manifest.permission.WRITE_SECURE_SETTINGS);
            }

            long ident = Binder.clearCallingIdentity();
            try {
                return setInputMethodEnabledLocked(id, enabled);
            } finally {
                Binder.restoreCallingIdentity(ident);
            }
        }
    }

    boolean setInputMethodEnabledLocked(String id, boolean enabled) {
        // Make sure this is a valid input method.
        InputMethodInfo imm = mMethodMap.get(id);
        if (imm == null) {
            throw new IllegalArgumentException("Unknown id: " + mCurMethodId);
        }

        List<Pair<String, ArrayList<String>>> enabledInputMethodsList = mSettings
                .getEnabledInputMethodsAndSubtypeListLocked();

        if (enabled) {
            for (Pair<String, ArrayList<String>> pair: enabledInputMethodsList) {
                if (pair.first.equals(id)) {
                    // We are enabling this input method, but it is already enabled.
                    // Nothing to do. The previous state was enabled.
                    return true;
                }
            }
            mSettings.appendAndPutEnabledInputMethodLocked(id, false);
            // Previous state was disabled.
            return false;
        } else {
            StringBuilder builder = new StringBuilder();
            if (mSettings.buildAndPutEnabledInputMethodsStrRemovingIdLocked(
                    builder, enabledInputMethodsList, id)) {
                // Disabled input method is currently selected, switch to another one.
                final String selId = mSettings.getSelectedInputMethod();
                if (id.equals(selId) && !chooseNewDefaultIMELocked()) {
                    Slog.i(TAG, "Can't find new IME, unsetting the current input method.");
                    resetSelectedInputMethodAndSubtypeLocked("");
                }
                // Previous state was enabled.
                return true;
            } else {
                // We are disabling the input method but it is already disabled.
                // Nothing to do.  The previous state was disabled.
                return false;
            }
        }
    }

    private void setSelectedInputMethodAndSubtypeLocked(InputMethodInfo imi, int subtypeId,
            boolean setSubtypeOnly) {
        // Update the history of InputMethod and Subtype
        mSettings.saveCurrentInputMethodAndSubtypeToHistory(mCurMethodId, mCurrentSubtype);

        mCurUserActionNotificationSequenceNumber =
                Math.max(mCurUserActionNotificationSequenceNumber + 1, 1);
        if (DEBUG) {
            Slog.d(TAG, "Bump mCurUserActionNotificationSequenceNumber:"
                    + mCurUserActionNotificationSequenceNumber);
        }

        if (mCurClient != null && mCurClient.client != null) {
            executeOrSendMessage(mCurClient.client, mCaller.obtainMessageIO(
                    MSG_SET_USER_ACTION_NOTIFICATION_SEQUENCE_NUMBER,
                    mCurUserActionNotificationSequenceNumber, mCurClient));
        }

        // Set Subtype here
        if (imi == null || subtypeId < 0) {
            mSettings.putSelectedSubtype(NOT_A_SUBTYPE_ID);
            mCurrentSubtype = null;
        } else {
            if (subtypeId < imi.getSubtypeCount()) {
                InputMethodSubtype subtype = imi.getSubtypeAt(subtypeId);
                mSettings.putSelectedSubtype(subtype.hashCode());
                mCurrentSubtype = subtype;
            } else {
                mSettings.putSelectedSubtype(NOT_A_SUBTYPE_ID);
                // If the subtype is not specified, choose the most applicable one
                mCurrentSubtype = getCurrentInputMethodSubtypeLocked();
            }
        }

        if (!setSubtypeOnly) {
            // Set InputMethod here
            mSettings.putSelectedInputMethod(imi != null ? imi.getId() : "");
        }
    }

    private void resetSelectedInputMethodAndSubtypeLocked(String newDefaultIme) {
        InputMethodInfo imi = mMethodMap.get(newDefaultIme);
        int lastSubtypeId = NOT_A_SUBTYPE_ID;
        // newDefaultIme is empty when there is no candidate for the selected IME.
        if (imi != null && !TextUtils.isEmpty(newDefaultIme)) {
            String subtypeHashCode = mSettings.getLastSubtypeForInputMethodLocked(newDefaultIme);
            if (subtypeHashCode != null) {
                try {
                    lastSubtypeId = InputMethodUtils.getSubtypeIdFromHashCode(
                            imi, Integer.parseInt(subtypeHashCode));
                } catch (NumberFormatException e) {
                    Slog.w(TAG, "HashCode for subtype looks broken: " + subtypeHashCode, e);
                }
            }
        }
        setSelectedInputMethodAndSubtypeLocked(imi, lastSubtypeId, false);
    }

    // If there are no selected shortcuts, tries finding the most applicable ones.
    private Pair<InputMethodInfo, InputMethodSubtype>
            findLastResortApplicableShortcutInputMethodAndSubtypeLocked(String mode) {
        List<InputMethodInfo> imis = mSettings.getEnabledInputMethodListLocked();
        InputMethodInfo mostApplicableIMI = null;
        InputMethodSubtype mostApplicableSubtype = null;
        boolean foundInSystemIME = false;

        // Search applicable subtype for each InputMethodInfo
        for (InputMethodInfo imi: imis) {
            final String imiId = imi.getId();
            if (foundInSystemIME && !imiId.equals(mCurMethodId)) {
                continue;
            }
            InputMethodSubtype subtype = null;
            final List<InputMethodSubtype> enabledSubtypes =
                    mSettings.getEnabledInputMethodSubtypeListLocked(mContext, imi, true);
            // 1. Search by the current subtype's locale from enabledSubtypes.
            if (mCurrentSubtype != null) {
                subtype = InputMethodUtils.findLastResortApplicableSubtypeLocked(
                        mRes, enabledSubtypes, mode, mCurrentSubtype.getLocale(), false);
            }
            // 2. Search by the system locale from enabledSubtypes.
            // 3. Search the first enabled subtype matched with mode from enabledSubtypes.
            if (subtype == null) {
                subtype = InputMethodUtils.findLastResortApplicableSubtypeLocked(
                        mRes, enabledSubtypes, mode, null, true);
            }
            final ArrayList<InputMethodSubtype> overridingImplicitlyEnabledSubtypes =
                    InputMethodUtils.getOverridingImplicitlyEnabledSubtypes(imi, mode);
            final ArrayList<InputMethodSubtype> subtypesForSearch =
                    overridingImplicitlyEnabledSubtypes.isEmpty()
                            ? InputMethodUtils.getSubtypes(imi)
                            : overridingImplicitlyEnabledSubtypes;
            // 4. Search by the current subtype's locale from all subtypes.
            if (subtype == null && mCurrentSubtype != null) {
                subtype = InputMethodUtils.findLastResortApplicableSubtypeLocked(
                        mRes, subtypesForSearch, mode, mCurrentSubtype.getLocale(), false);
            }
            // 5. Search by the system locale from all subtypes.
            // 6. Search the first enabled subtype matched with mode from all subtypes.
            if (subtype == null) {
                subtype = InputMethodUtils.findLastResortApplicableSubtypeLocked(
                        mRes, subtypesForSearch, mode, null, true);
            }
            if (subtype != null) {
                if (imiId.equals(mCurMethodId)) {
                    // The current input method is the most applicable IME.
                    mostApplicableIMI = imi;
                    mostApplicableSubtype = subtype;
                    break;
                } else if (!foundInSystemIME) {
                    // The system input method is 2nd applicable IME.
                    mostApplicableIMI = imi;
                    mostApplicableSubtype = subtype;
                    if ((imi.getServiceInfo().applicationInfo.flags
                            & ApplicationInfo.FLAG_SYSTEM) != 0) {
                        foundInSystemIME = true;
                    }
                }
            }
        }
        if (DEBUG) {
            if (mostApplicableIMI != null) {
                Slog.w(TAG, "Most applicable shortcut input method was:"
                        + mostApplicableIMI.getId());
                if (mostApplicableSubtype != null) {
                    Slog.w(TAG, "Most applicable shortcut input method subtype was:"
                            + "," + mostApplicableSubtype.getMode() + ","
                            + mostApplicableSubtype.getLocale());
                }
            }
        }
        if (mostApplicableIMI != null) {
            return new Pair<> (mostApplicableIMI, mostApplicableSubtype);
        } else {
            return null;
        }
    }

    /**
     * @return Return the current subtype of this input method.
     */
    @Override
    public InputMethodSubtype getCurrentInputMethodSubtype() {
        // TODO: Make this work even for non-current users?
        if (!calledFromValidUser()) {
            return null;
        }
        synchronized (mMethodMap) {
            return getCurrentInputMethodSubtypeLocked();
        }
    }

    private InputMethodSubtype getCurrentInputMethodSubtypeLocked() {
        if (mCurMethodId == null) {
            return null;
        }
        final boolean subtypeIsSelected = mSettings.isSubtypeSelected();
        final InputMethodInfo imi = mMethodMap.get(mCurMethodId);
        if (imi == null || imi.getSubtypeCount() == 0) {
            return null;
        }
        if (!subtypeIsSelected || mCurrentSubtype == null
                || !InputMethodUtils.isValidSubtypeId(imi, mCurrentSubtype.hashCode())) {
            int subtypeId = mSettings.getSelectedInputMethodSubtypeId(mCurMethodId);
            if (subtypeId == NOT_A_SUBTYPE_ID) {
                // If there are no selected subtypes, the framework will try to find
                // the most applicable subtype from explicitly or implicitly enabled
                // subtypes.
                List<InputMethodSubtype> explicitlyOrImplicitlyEnabledSubtypes =
                        mSettings.getEnabledInputMethodSubtypeListLocked(mContext, imi, true);
                // If there is only one explicitly or implicitly enabled subtype,
                // just returns it.
                if (explicitlyOrImplicitlyEnabledSubtypes.size() == 1) {
                    mCurrentSubtype = explicitlyOrImplicitlyEnabledSubtypes.get(0);
                } else if (explicitlyOrImplicitlyEnabledSubtypes.size() > 1) {
                    mCurrentSubtype = InputMethodUtils.findLastResortApplicableSubtypeLocked(
                            mRes, explicitlyOrImplicitlyEnabledSubtypes,
                            InputMethodUtils.SUBTYPE_MODE_KEYBOARD, null, true);
                    if (mCurrentSubtype == null) {
                        mCurrentSubtype = InputMethodUtils.findLastResortApplicableSubtypeLocked(
                                mRes, explicitlyOrImplicitlyEnabledSubtypes, null, null,
                                true);
                    }
                }
            } else {
                mCurrentSubtype = InputMethodUtils.getSubtypes(imi).get(subtypeId);
            }
        }
        return mCurrentSubtype;
    }

    // TODO: We should change the return type from List to List<Parcelable>
    @SuppressWarnings("rawtypes")
    @Override
    public List getShortcutInputMethodsAndSubtypes() {
        synchronized (mMethodMap) {
            ArrayList<Object> ret = new ArrayList<>();
            if (mShortcutInputMethodsAndSubtypes.size() == 0) {
                // If there are no selected shortcut subtypes, the framework will try to find
                // the most applicable subtype from all subtypes whose mode is
                // SUBTYPE_MODE_VOICE. This is an exceptional case, so we will hardcode the mode.
                Pair<InputMethodInfo, InputMethodSubtype> info =
                    findLastResortApplicableShortcutInputMethodAndSubtypeLocked(
                            InputMethodUtils.SUBTYPE_MODE_VOICE);
                if (info != null) {
                    ret.add(info.first);
                    ret.add(info.second);
                }
                return ret;
            }
            for (InputMethodInfo imi: mShortcutInputMethodsAndSubtypes.keySet()) {
                ret.add(imi);
                for (InputMethodSubtype subtype: mShortcutInputMethodsAndSubtypes.get(imi)) {
                    ret.add(subtype);
                }
            }
            return ret;
        }
    }

    @Override
    public boolean setCurrentInputMethodSubtype(InputMethodSubtype subtype) {
        // TODO: Make this work even for non-current users?
        if (!calledFromValidUser()) {
            return false;
        }
        synchronized (mMethodMap) {
            if (subtype != null && mCurMethodId != null) {
                InputMethodInfo imi = mMethodMap.get(mCurMethodId);
                int subtypeId = InputMethodUtils.getSubtypeIdFromHashCode(imi, subtype.hashCode());
                if (subtypeId != NOT_A_SUBTYPE_ID) {
                    setInputMethodLocked(mCurMethodId, subtypeId);
                    return true;
                }
            }
            return false;
        }
    }

    // TODO: Cache the state for each user and reset when the cached user is removed.
    private static class InputMethodFileManager {
        private static final String SYSTEM_PATH = "system";
        private static final String INPUT_METHOD_PATH = "inputmethod";
        private static final String ADDITIONAL_SUBTYPES_FILE_NAME = "subtypes.xml";
        private static final String NODE_SUBTYPES = "subtypes";
        private static final String NODE_SUBTYPE = "subtype";
        private static final String NODE_IMI = "imi";
        private static final String ATTR_ID = "id";
        private static final String ATTR_LABEL = "label";
        private static final String ATTR_ICON = "icon";
        private static final String ATTR_IME_SUBTYPE_ID = "subtypeId";
        private static final String ATTR_IME_SUBTYPE_LOCALE = "imeSubtypeLocale";
        private static final String ATTR_IME_SUBTYPE_LANGUAGE_TAG = "languageTag";
        private static final String ATTR_IME_SUBTYPE_MODE = "imeSubtypeMode";
        private static final String ATTR_IME_SUBTYPE_EXTRA_VALUE = "imeSubtypeExtraValue";
        private static final String ATTR_IS_AUXILIARY = "isAuxiliary";
        private static final String ATTR_IS_ASCII_CAPABLE = "isAsciiCapable";
        private final AtomicFile mAdditionalInputMethodSubtypeFile;
        private final HashMap<String, InputMethodInfo> mMethodMap;
        private final HashMap<String, List<InputMethodSubtype>> mAdditionalSubtypesMap =
                new HashMap<>();
        public InputMethodFileManager(HashMap<String, InputMethodInfo> methodMap, int userId) {
            if (methodMap == null) {
                throw new NullPointerException("methodMap is null");
            }
            mMethodMap = methodMap;
            final File systemDir = userId == UserHandle.USER_SYSTEM
                    ? new File(Environment.getDataDirectory(), SYSTEM_PATH)
                    : Environment.getUserSystemDirectory(userId);
            final File inputMethodDir = new File(systemDir, INPUT_METHOD_PATH);
            if (!inputMethodDir.exists() && !inputMethodDir.mkdirs()) {
                Slog.w(TAG, "Couldn't create dir.: " + inputMethodDir.getAbsolutePath());
            }
            final File subtypeFile = new File(inputMethodDir, ADDITIONAL_SUBTYPES_FILE_NAME);
            mAdditionalInputMethodSubtypeFile = new AtomicFile(subtypeFile);
            if (!subtypeFile.exists()) {
                // If "subtypes.xml" doesn't exist, create a blank file.
                writeAdditionalInputMethodSubtypes(
                        mAdditionalSubtypesMap, mAdditionalInputMethodSubtypeFile, methodMap);
            } else {
                readAdditionalInputMethodSubtypes(
                        mAdditionalSubtypesMap, mAdditionalInputMethodSubtypeFile);
            }
        }

        private void deleteAllInputMethodSubtypes(String imiId) {
            synchronized (mMethodMap) {
                mAdditionalSubtypesMap.remove(imiId);
                writeAdditionalInputMethodSubtypes(
                        mAdditionalSubtypesMap, mAdditionalInputMethodSubtypeFile, mMethodMap);
            }
        }

        public void addInputMethodSubtypes(
                InputMethodInfo imi, InputMethodSubtype[] additionalSubtypes) {
            synchronized (mMethodMap) {
                final ArrayList<InputMethodSubtype> subtypes = new ArrayList<>();
                final int N = additionalSubtypes.length;
                for (int i = 0; i < N; ++i) {
                    final InputMethodSubtype subtype = additionalSubtypes[i];
                    if (!subtypes.contains(subtype)) {
                        subtypes.add(subtype);
                    } else {
                        Slog.w(TAG, "Duplicated subtype definition found: "
                                + subtype.getLocale() + ", " + subtype.getMode());
                    }
                }
                mAdditionalSubtypesMap.put(imi.getId(), subtypes);
                writeAdditionalInputMethodSubtypes(
                        mAdditionalSubtypesMap, mAdditionalInputMethodSubtypeFile, mMethodMap);
            }
        }

        public HashMap<String, List<InputMethodSubtype>> getAllAdditionalInputMethodSubtypes() {
            synchronized (mMethodMap) {
                return mAdditionalSubtypesMap;
            }
        }

        private static void writeAdditionalInputMethodSubtypes(
                HashMap<String, List<InputMethodSubtype>> allSubtypes, AtomicFile subtypesFile,
                HashMap<String, InputMethodInfo> methodMap) {
            // Safety net for the case that this function is called before methodMap is set.
            final boolean isSetMethodMap = methodMap != null && methodMap.size() > 0;
            FileOutputStream fos = null;
            try {
                fos = subtypesFile.startWrite();
                final XmlSerializer out = new FastXmlSerializer();
                out.setOutput(fos, StandardCharsets.UTF_8.name());
                out.startDocument(null, true);
                out.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true);
                out.startTag(null, NODE_SUBTYPES);
                for (String imiId : allSubtypes.keySet()) {
                    if (isSetMethodMap && !methodMap.containsKey(imiId)) {
                        Slog.w(TAG, "IME uninstalled or not valid.: " + imiId);
                        continue;
                    }
                    out.startTag(null, NODE_IMI);
                    out.attribute(null, ATTR_ID, imiId);
                    final List<InputMethodSubtype> subtypesList = allSubtypes.get(imiId);
                    final int N = subtypesList.size();
                    for (int i = 0; i < N; ++i) {
                        final InputMethodSubtype subtype = subtypesList.get(i);
                        out.startTag(null, NODE_SUBTYPE);
                        if (subtype.hasSubtypeId()) {
                            out.attribute(null, ATTR_IME_SUBTYPE_ID,
                                    String.valueOf(subtype.getSubtypeId()));
                        }
                        out.attribute(null, ATTR_ICON, String.valueOf(subtype.getIconResId()));
                        out.attribute(null, ATTR_LABEL, String.valueOf(subtype.getNameResId()));
                        out.attribute(null, ATTR_IME_SUBTYPE_LOCALE, subtype.getLocale());
                        out.attribute(null, ATTR_IME_SUBTYPE_LANGUAGE_TAG,
                                subtype.getLanguageTag());
                        out.attribute(null, ATTR_IME_SUBTYPE_MODE, subtype.getMode());
                        out.attribute(null, ATTR_IME_SUBTYPE_EXTRA_VALUE, subtype.getExtraValue());
                        out.attribute(null, ATTR_IS_AUXILIARY,
                                String.valueOf(subtype.isAuxiliary() ? 1 : 0));
                        out.attribute(null, ATTR_IS_ASCII_CAPABLE,
                                String.valueOf(subtype.isAsciiCapable() ? 1 : 0));
                        out.endTag(null, NODE_SUBTYPE);
                    }
                    out.endTag(null, NODE_IMI);
                }
                out.endTag(null, NODE_SUBTYPES);
                out.endDocument();
                subtypesFile.finishWrite(fos);
            } catch (java.io.IOException e) {
                Slog.w(TAG, "Error writing subtypes", e);
                if (fos != null) {
                    subtypesFile.failWrite(fos);
                }
            }
        }

        private static void readAdditionalInputMethodSubtypes(
                HashMap<String, List<InputMethodSubtype>> allSubtypes, AtomicFile subtypesFile) {
            if (allSubtypes == null || subtypesFile == null) return;
            allSubtypes.clear();
            try (final FileInputStream fis = subtypesFile.openRead()) {
                final XmlPullParser parser = Xml.newPullParser();
                parser.setInput(fis, StandardCharsets.UTF_8.name());
                int type = parser.getEventType();
                // Skip parsing until START_TAG
                while ((type = parser.next()) != XmlPullParser.START_TAG
                        && type != XmlPullParser.END_DOCUMENT) {}
                String firstNodeName = parser.getName();
                if (!NODE_SUBTYPES.equals(firstNodeName)) {
                    throw new XmlPullParserException("Xml doesn't start with subtypes");
                }
                final int depth =parser.getDepth();
                String currentImiId = null;
                ArrayList<InputMethodSubtype> tempSubtypesArray = null;
                while (((type = parser.next()) != XmlPullParser.END_TAG
                        || parser.getDepth() > depth) && type != XmlPullParser.END_DOCUMENT) {
                    if (type != XmlPullParser.START_TAG)
                        continue;
                    final String nodeName = parser.getName();
                    if (NODE_IMI.equals(nodeName)) {
                        currentImiId = parser.getAttributeValue(null, ATTR_ID);
                        if (TextUtils.isEmpty(currentImiId)) {
                            Slog.w(TAG, "Invalid imi id found in subtypes.xml");
                            continue;
                        }
                        tempSubtypesArray = new ArrayList<>();
                        allSubtypes.put(currentImiId, tempSubtypesArray);
                    } else if (NODE_SUBTYPE.equals(nodeName)) {
                        if (TextUtils.isEmpty(currentImiId) || tempSubtypesArray == null) {
                            Slog.w(TAG, "IME uninstalled or not valid.: " + currentImiId);
                            continue;
                        }
                        final int icon = Integer.parseInt(
                                parser.getAttributeValue(null, ATTR_ICON));
                        final int label = Integer.parseInt(
                                parser.getAttributeValue(null, ATTR_LABEL));
                        final String imeSubtypeLocale =
                                parser.getAttributeValue(null, ATTR_IME_SUBTYPE_LOCALE);
                        final String languageTag =
                                parser.getAttributeValue(null, ATTR_IME_SUBTYPE_LANGUAGE_TAG);
                        final String imeSubtypeMode =
                                parser.getAttributeValue(null, ATTR_IME_SUBTYPE_MODE);
                        final String imeSubtypeExtraValue =
                                parser.getAttributeValue(null, ATTR_IME_SUBTYPE_EXTRA_VALUE);
                        final boolean isAuxiliary = "1".equals(String.valueOf(
                                parser.getAttributeValue(null, ATTR_IS_AUXILIARY)));
                        final boolean isAsciiCapable = "1".equals(String.valueOf(
                                parser.getAttributeValue(null, ATTR_IS_ASCII_CAPABLE)));
                        final InputMethodSubtypeBuilder builder = new InputMethodSubtypeBuilder()
                                .setSubtypeNameResId(label)
                                .setSubtypeIconResId(icon)
                                .setSubtypeLocale(imeSubtypeLocale)
                                .setLanguageTag(languageTag)
                                .setSubtypeMode(imeSubtypeMode)
                                .setSubtypeExtraValue(imeSubtypeExtraValue)
                                .setIsAuxiliary(isAuxiliary)
                                .setIsAsciiCapable(isAsciiCapable);
                        final String subtypeIdString =
                                parser.getAttributeValue(null, ATTR_IME_SUBTYPE_ID);
                        if (subtypeIdString != null) {
                            builder.setSubtypeId(Integer.parseInt(subtypeIdString));
                        }
                        tempSubtypesArray.add(builder.build());
                    }
                }
            } catch (XmlPullParserException | IOException | NumberFormatException e) {
                Slog.w(TAG, "Error reading subtypes", e);
                return;
            }
        }
    }

    private static final class LocalServiceImpl implements InputMethodManagerInternal {
        @NonNull
        private final Handler mHandler;

        LocalServiceImpl(@NonNull final Handler handler) {
            mHandler = handler;
        }

        @Override
        public void setInteractive(boolean interactive) {
            // Do everything in handler so as not to block the caller.
            mHandler.sendMessage(mHandler.obtainMessage(MSG_SET_INTERACTIVE,
                    interactive ? 1 : 0, 0));
        }

        @Override
        public void switchInputMethod(boolean forwardDirection) {
            // Do everything in handler so as not to block the caller.
            mHandler.sendMessage(mHandler.obtainMessage(MSG_SWITCH_IME,
                    forwardDirection ? 1 : 0, 0));
        }

        @Override
        public void hideCurrentInputMethod() {
            mHandler.removeMessages(MSG_HIDE_CURRENT_INPUT_METHOD);
            mHandler.sendEmptyMessage(MSG_HIDE_CURRENT_INPUT_METHOD);
        }
    }

    private static String imeWindowStatusToString(final int imeWindowVis) {
        final StringBuilder sb = new StringBuilder();
        boolean first = true;
        if ((imeWindowVis & InputMethodService.IME_ACTIVE) != 0) {
            sb.append("Active");
            first = false;
        }
        if ((imeWindowVis & InputMethodService.IME_VISIBLE) != 0) {
            if (!first) {
                sb.append("|");
            }
            sb.append("Visible");
        }
        return sb.toString();
    }

    @Override
    public IInputContentUriToken createInputContentUriToken(@Nullable IBinder token,
            @Nullable Uri contentUri, @Nullable String packageName) {
        if (!calledFromValidUser()) {
            return null;
        }

        if (token == null) {
            throw new NullPointerException("token");
        }
        if (packageName == null) {
            throw new NullPointerException("packageName");
        }
        if (contentUri == null) {
            throw new NullPointerException("contentUri");
        }
        final String contentUriScheme = contentUri.getScheme();
        if (!"content".equals(contentUriScheme)) {
            throw new InvalidParameterException("contentUri must have content scheme");
        }

        synchronized (mMethodMap) {
            final int uid = Binder.getCallingUid();
            if (mCurMethodId == null) {
                return null;
            }
            if (mCurToken != token) {
                Slog.e(TAG, "Ignoring createInputContentUriToken mCurToken=" + mCurToken
                        + " token=" + token);
                return null;
            }
            // We cannot simply distinguish a bad IME that reports an arbitrary package name from
            // an unfortunate IME whose internal state is already obsolete due to the asynchronous
            // nature of our system.  Let's compare it with our internal record.
            if (!TextUtils.equals(mCurAttribute.packageName, packageName)) {
                Slog.e(TAG, "Ignoring createInputContentUriToken mCurAttribute.packageName="
                    + mCurAttribute.packageName + " packageName=" + packageName);
                return null;
            }
            // This user ID can never bee spoofed.
            final int imeUserId = UserHandle.getUserId(uid);
            // This user ID can never bee spoofed.
            final int appUserId = UserHandle.getUserId(mCurClient.uid);
            // This user ID may be invalid if "contentUri" embedded an invalid user ID.
            final int contentUriOwnerUserId = ContentProvider.getUserIdFromUri(contentUri,
                    imeUserId);
            final Uri contentUriWithoutUserId = ContentProvider.getUriWithoutUserId(contentUri);
            // Note: InputContentUriTokenHandler.take() checks whether the IME (specified by "uid")
            // actually has the right to grant a read permission for "contentUriWithoutUserId" that
            // is claimed to belong to "contentUriOwnerUserId".  For example, specifying random
            // content URI and/or contentUriOwnerUserId just results in a SecurityException thrown
            // from InputContentUriTokenHandler.take() and can never be allowed beyond what is
            // actually allowed to "uid", which is guaranteed to be the IME's one.
            return new InputContentUriTokenHandler(contentUriWithoutUserId, uid,
                    packageName, contentUriOwnerUserId, appUserId);
        }
    }

    @Override
    public void reportFullscreenMode(IBinder token, boolean fullscreen) {
        if (!calledFromValidUser()) {
            return;
        }
        synchronized (mMethodMap) {
            if (!calledWithValidToken(token)) {
                return;
            }
            if (mCurClient != null && mCurClient.client != null) {
                mInFullscreenMode = fullscreen;
                executeOrSendMessage(mCurClient.client, mCaller.obtainMessageIO(
                        MSG_REPORT_FULLSCREEN_MODE, fullscreen ? 1 : 0, mCurClient));
            }
        }
    }

    @Override
    protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
        if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP)
                != PackageManager.PERMISSION_GRANTED) {

            pw.println("Permission Denial: can't dump InputMethodManager from from pid="
                    + Binder.getCallingPid()
                    + ", uid=" + Binder.getCallingUid());
            return;
        }

        IInputMethod method;
        ClientState client;
        ClientState focusedWindowClient;

        final Printer p = new PrintWriterPrinter(pw);

        synchronized (mMethodMap) {
            p.println("Current Input Method Manager state:");
            int N = mMethodList.size();
            p.println("  Input Methods: mMethodMapUpdateCount=" + mMethodMapUpdateCount);
            for (int i=0; i<N; i++) {
                InputMethodInfo info = mMethodList.get(i);
                p.println("  InputMethod #" + i + ":");
                info.dump(p, "    ");
            }
            p.println("  Clients:");
            for (ClientState ci : mClients.values()) {
                p.println("  Client " + ci + ":");
                p.println("    client=" + ci.client);
                p.println("    inputContext=" + ci.inputContext);
                p.println("    sessionRequested=" + ci.sessionRequested);
                p.println("    curSession=" + ci.curSession);
            }
            p.println("  mCurMethodId=" + mCurMethodId);
            client = mCurClient;
            p.println("  mCurClient=" + client + " mCurSeq=" + mCurSeq);
            p.println("  mCurFocusedWindow=" + mCurFocusedWindow
                    + " softInputMode=" +
                    InputMethodClient.softInputModeToString(mCurFocusedWindowSoftInputMode)
                    + " client=" + mCurFocusedWindowClient);
            focusedWindowClient = mCurFocusedWindowClient;
            p.println("  mCurId=" + mCurId + " mHaveConnect=" + mHaveConnection
                    + " mBoundToMethod=" + mBoundToMethod);
            p.println("  mCurToken=" + mCurToken);
            p.println("  mCurIntent=" + mCurIntent);
            method = mCurMethod;
            p.println("  mCurMethod=" + mCurMethod);
            p.println("  mEnabledSession=" + mEnabledSession);
            p.println("  mImeWindowVis=" + imeWindowStatusToString(mImeWindowVis));
            p.println("  mShowRequested=" + mShowRequested
                    + " mShowExplicitlyRequested=" + mShowExplicitlyRequested
                    + " mShowForced=" + mShowForced
                    + " mInputShown=" + mInputShown);
            p.println("  mInFullscreenMode=" + mInFullscreenMode);
            p.println("  mCurUserActionNotificationSequenceNumber="
                    + mCurUserActionNotificationSequenceNumber);
            p.println("  mSystemReady=" + mSystemReady + " mInteractive=" + mIsInteractive);
            p.println("  mSettingsObserver=" + mSettingsObserver);
            p.println("  mSwitchingController:");
            mSwitchingController.dump(p);
            p.println("  mSettings:");
            mSettings.dumpLocked(p, "    ");

            p.println("  mStartInputHistory:");
            mStartInputHistory.dump(pw, "   ");
        }

        p.println(" ");
        if (client != null) {
            pw.flush();
            try {
                TransferPipe.dumpAsync(client.client.asBinder(), fd, args);
            } catch (IOException | RemoteException e) {
                p.println("Failed to dump input method client: " + e);
            }
        } else {
            p.println("No input method client.");
        }

        if (focusedWindowClient != null && client != focusedWindowClient) {
            p.println(" ");
            p.println("Warning: Current input method client doesn't match the last focused. "
                    + "window.");
            p.println("Dumping input method client in the last focused window just in case.");
            p.println(" ");
            pw.flush();
            try {
                TransferPipe.dumpAsync(focusedWindowClient.client.asBinder(), fd, args);
            } catch (IOException | RemoteException e) {
                p.println("Failed to dump input method client in focused window: " + e);
            }
        }

        p.println(" ");
        if (method != null) {
            pw.flush();
            try {
                TransferPipe.dumpAsync(method.asBinder(), fd, args);
            } catch (IOException | RemoteException e) {
                p.println("Failed to dump input method service: " + e);
            }
        } else {
            p.println("No input method service.");
        }
    }
}