services/core/java/com/android/server/input/InputManagerService.java

/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * 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.input;

import android.annotation.NonNull;
import android.app.IInputForwarder;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.ActivityInfo;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.ResolveInfo;
import android.content.res.Resources;
import android.content.res.Resources.NotFoundException;
import android.content.res.TypedArray;
import android.content.res.XmlResourceParser;
import android.database.ContentObserver;
import android.hardware.display.DisplayManager;
import android.hardware.display.DisplayViewport;
import android.hardware.input.IInputDevicesChangedListener;
import android.hardware.input.IInputManager;
import android.hardware.input.ITabletModeChangedListener;
import android.hardware.input.InputDeviceIdentifier;
import android.hardware.input.InputManager;
import android.hardware.input.InputManagerInternal;
import android.hardware.input.KeyboardLayout;
import android.hardware.input.TouchCalibration;
import android.os.Binder;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.IBinder;
import android.os.LocaleList;
import android.os.Looper;
import android.os.Message;
import android.os.MessageQueue;
import android.os.Process;
import android.os.RemoteException;
import android.os.UserHandle;
import android.provider.Settings;
import android.provider.Settings.SettingNotFoundException;
import android.text.TextUtils;
import android.util.Log;
import android.util.Pair;
import android.util.Slog;
import android.util.SparseArray;
import android.view.Display;
import android.view.IInputFilter;
import android.view.IInputFilterHost;
import android.view.IWindow;
import android.view.InputApplicationHandle;
import android.view.InputChannel;
import android.view.InputDevice;
import android.view.InputEvent;
import android.view.InputWindowHandle;
import android.view.KeyEvent;
import android.view.PointerIcon;
import android.view.Surface;
import android.view.ViewConfiguration;
import android.widget.Toast;

import com.android.internal.R;
import com.android.internal.messages.nano.SystemMessageProto.SystemMessage;
import com.android.internal.notification.SystemNotificationChannels;
import com.android.internal.os.SomeArgs;
import com.android.internal.util.DumpUtils;
import com.android.internal.util.Preconditions;
import com.android.internal.util.XmlUtils;
import com.android.server.DisplayThread;
import com.android.server.LocalServices;
import com.android.server.Watchdog;
import com.android.server.policy.WindowManagerPolicy;

import libcore.io.IoUtils;
import libcore.io.Streams;

import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Objects;

/*
 * Wraps the C++ InputManager and provides its callbacks.
 */
public class InputManagerService extends IInputManager.Stub
        implements Watchdog.Monitor {
    static final String TAG = "InputManager";
    static final boolean DEBUG = false;

    private static final String EXCLUDED_DEVICES_PATH = "etc/excluded-input-devices.xml";
    private static final String PORT_ASSOCIATIONS_PATH = "etc/input-port-associations.xml";

    private static final int MSG_DELIVER_INPUT_DEVICES_CHANGED = 1;
    private static final int MSG_SWITCH_KEYBOARD_LAYOUT = 2;
    private static final int MSG_RELOAD_KEYBOARD_LAYOUTS = 3;
    private static final int MSG_UPDATE_KEYBOARD_LAYOUTS = 4;
    private static final int MSG_RELOAD_DEVICE_ALIASES = 5;
    private static final int MSG_DELIVER_TABLET_MODE_CHANGED = 6;

    // Pointer to native input manager service object.
    private final long mPtr;

    private final Context mContext;
    private final InputManagerHandler mHandler;

    private final File mDoubleTouchGestureEnableFile;

    private WindowManagerCallbacks mWindowManagerCallbacks;
    private WiredAccessoryCallbacks mWiredAccessoryCallbacks;
    private boolean mSystemReady;
    private NotificationManager mNotificationManager;

    private final Object mTabletModeLock = new Object();
    // List of currently registered tablet mode changed listeners by process id
    private final SparseArray<TabletModeChangedListenerRecord> mTabletModeChangedListeners =
            new SparseArray<>(); // guarded by mTabletModeLock
    private final List<TabletModeChangedListenerRecord> mTempTabletModeChangedListenersToNotify =
            new ArrayList<>();

    // Persistent data store.  Must be locked each time during use.
    private final PersistentDataStore mDataStore = new PersistentDataStore();

    // List of currently registered input devices changed listeners by process id.
    private Object mInputDevicesLock = new Object();
    private boolean mInputDevicesChangedPending; // guarded by mInputDevicesLock
    private InputDevice[] mInputDevices = new InputDevice[0];
    private final SparseArray<InputDevicesChangedListenerRecord> mInputDevicesChangedListeners =
            new SparseArray<InputDevicesChangedListenerRecord>(); // guarded by mInputDevicesLock
    private final ArrayList<InputDevicesChangedListenerRecord>
            mTempInputDevicesChangedListenersToNotify =
                    new ArrayList<InputDevicesChangedListenerRecord>(); // handler thread only
    private final ArrayList<InputDevice>
            mTempFullKeyboards = new ArrayList<InputDevice>(); // handler thread only
    private boolean mKeyboardLayoutNotificationShown;
    private PendingIntent mKeyboardLayoutIntent;
    private Toast mSwitchedKeyboardLayoutToast;

    // State for vibrator tokens.
    private Object mVibratorLock = new Object();
    private HashMap<IBinder, VibratorToken> mVibratorTokens =
            new HashMap<IBinder, VibratorToken>();
    private int mNextVibratorTokenValue;

    // State for the currently installed input filter.
    final Object mInputFilterLock = new Object();
    IInputFilter mInputFilter; // guarded by mInputFilterLock
    InputFilterHost mInputFilterHost; // guarded by mInputFilterLock

    private IWindow mFocusedWindow;
    private boolean mFocusedWindowHasCapture;

    private static native long nativeInit(InputManagerService service,
            Context context, MessageQueue messageQueue);
    private static native void nativeStart(long ptr);
    private static native void nativeSetDisplayViewports(long ptr,
            DisplayViewport[] viewports);

    private static native int nativeGetScanCodeState(long ptr,
            int deviceId, int sourceMask, int scanCode);
    private static native int nativeGetKeyCodeState(long ptr,
            int deviceId, int sourceMask, int keyCode);
    private static native int nativeGetSwitchState(long ptr,
            int deviceId, int sourceMask, int sw);
    private static native boolean nativeHasKeys(long ptr,
            int deviceId, int sourceMask, int[] keyCodes, boolean[] keyExists);
    private static native void nativeRegisterInputChannel(long ptr, InputChannel inputChannel,
            int displayId);
    private static native void nativeUnregisterInputChannel(long ptr, InputChannel inputChannel);
    private static native void nativeSetInputFilterEnabled(long ptr, boolean enable);
    private static native int nativeInjectInputEvent(long ptr, InputEvent event,
            int injectorPid, int injectorUid, int syncMode, int timeoutMillis,
            int policyFlags);
    private static native void nativeToggleCapsLock(long ptr, int deviceId);
    private static native void nativeSetInputWindows(long ptr, InputWindowHandle[] windowHandles,
            int displayId);
    private static native void nativeSetInputDispatchMode(long ptr, boolean enabled, boolean frozen);
    private static native void nativeSetSystemUiVisibility(long ptr, int visibility);
    private static native void nativeSetFocusedApplication(long ptr,
            int displayId, InputApplicationHandle application);
    private static native void nativeSetFocusedDisplay(long ptr, int displayId);
    private static native boolean nativeTransferTouchFocus(long ptr,
            InputChannel fromChannel, InputChannel toChannel);
    private static native void nativeSetPointerSpeed(long ptr, int speed);
    private static native void nativeSetShowTouches(long ptr, boolean enabled);
    private static native void nativeSetInteractive(long ptr, boolean interactive);
    private static native void nativeReloadCalibration(long ptr);
    private static native void nativeVibrate(long ptr, int deviceId, long[] pattern,
            int repeat, int token);
    private static native void nativeCancelVibrate(long ptr, int deviceId, int token);
    private static native void nativeReloadKeyboardLayouts(long ptr);
    private static native void nativeReloadDeviceAliases(long ptr);
    private static native String nativeDump(long ptr);
    private static native void nativeMonitor(long ptr);
    private static native boolean nativeIsInputDeviceEnabled(long ptr, int deviceId);
    private static native void nativeEnableInputDevice(long ptr, int deviceId);
    private static native void nativeDisableInputDevice(long ptr, int deviceId);
    private static native void nativeSetPointerIconType(long ptr, int iconId);
    private static native void nativeReloadPointerIcons(long ptr);
    private static native void nativeSetCustomPointerIcon(long ptr, PointerIcon icon);
    private static native void nativeSetPointerCapture(long ptr, boolean detached);

    // Input event injection constants defined in InputDispatcher.h.
    private static final int INPUT_EVENT_INJECTION_SUCCEEDED = 0;
    private static final int INPUT_EVENT_INJECTION_PERMISSION_DENIED = 1;
    private static final int INPUT_EVENT_INJECTION_FAILED = 2;
    private static final int INPUT_EVENT_INJECTION_TIMED_OUT = 3;

    // Maximum number of milliseconds to wait for input event injection.
    private static final int INJECTION_TIMEOUT_MILLIS = 30 * 1000;

    // Key states (may be returned by queries about the current state of a
    // particular key code, scan code or switch).

    /** The key state is unknown or the requested key itself is not supported. */
    public static final int KEY_STATE_UNKNOWN = -1;

    /** The key is up. /*/
    public static final int KEY_STATE_UP = 0;

    /** The key is down. */
    public static final int KEY_STATE_DOWN = 1;

    /** The key is down but is a virtual key press that is being emulated by the system. */
    public static final int KEY_STATE_VIRTUAL = 2;

    /** Scan code: Mouse / trackball button. */
    public static final int BTN_MOUSE = 0x110;

    // Switch code values must match bionic/libc/kernel/common/linux/input.h
    /** Switch code: Lid switch.  When set, lid is shut. */
    public static final int SW_LID = 0x00;

    /** Switch code: Tablet mode switch.
     * When set, the device is in tablet mode (i.e. no keyboard is connected).
     */
    public static final int SW_TABLET_MODE = 0x01;

    /** Switch code: Keypad slide.  When set, keyboard is exposed. */
    public static final int SW_KEYPAD_SLIDE = 0x0a;

    /** Switch code: Headphone.  When set, headphone is inserted. */
    public static final int SW_HEADPHONE_INSERT = 0x02;

    /** Switch code: Microphone.  When set, microphone is inserted. */
    public static final int SW_MICROPHONE_INSERT = 0x04;

    /** Switch code: Line out.  When set, Line out (hi-Z) is inserted. */
    public static final int SW_LINEOUT_INSERT = 0x06;

    /** Switch code: Headphone/Microphone Jack.  When set, something is inserted. */
    public static final int SW_JACK_PHYSICAL_INSERT = 0x07;

    /** Switch code: Camera lens cover. When set the lens is covered. */
    public static final int SW_CAMERA_LENS_COVER = 0x09;

    public static final int SW_LID_BIT = 1 << SW_LID;
    public static final int SW_TABLET_MODE_BIT = 1 << SW_TABLET_MODE;
    public static final int SW_KEYPAD_SLIDE_BIT = 1 << SW_KEYPAD_SLIDE;
    public static final int SW_HEADPHONE_INSERT_BIT = 1 << SW_HEADPHONE_INSERT;
    public static final int SW_MICROPHONE_INSERT_BIT = 1 << SW_MICROPHONE_INSERT;
    public static final int SW_LINEOUT_INSERT_BIT = 1 << SW_LINEOUT_INSERT;
    public static final int SW_JACK_PHYSICAL_INSERT_BIT = 1 << SW_JACK_PHYSICAL_INSERT;
    public static final int SW_JACK_BITS =
            SW_HEADPHONE_INSERT_BIT | SW_MICROPHONE_INSERT_BIT | SW_JACK_PHYSICAL_INSERT_BIT | SW_LINEOUT_INSERT_BIT;
    public static final int SW_CAMERA_LENS_COVER_BIT = 1 << SW_CAMERA_LENS_COVER;

    /** Whether to use the dev/input/event or uevent subsystem for the audio jack. */
    final boolean mUseDevInputEventForAudioJack;

    public InputManagerService(Context context) {
        this.mContext = context;
        this.mHandler = new InputManagerHandler(DisplayThread.get().getLooper());

        mUseDevInputEventForAudioJack =
                context.getResources().getBoolean(R.bool.config_useDevInputEventForAudioJack);
        Slog.i(TAG, "Initializing input manager, mUseDevInputEventForAudioJack="
                + mUseDevInputEventForAudioJack);
        mPtr = nativeInit(this, mContext, mHandler.getLooper().getQueue());

        String doubleTouchGestureEnablePath = context.getResources().getString(
                R.string.config_doubleTouchGestureEnableFile);
        mDoubleTouchGestureEnableFile = TextUtils.isEmpty(doubleTouchGestureEnablePath) ? null :
            new File(doubleTouchGestureEnablePath);

        LocalServices.addService(InputManagerInternal.class, new LocalService());
    }

    public void setWindowManagerCallbacks(WindowManagerCallbacks callbacks) {
        mWindowManagerCallbacks = callbacks;
    }

    public void setWiredAccessoryCallbacks(WiredAccessoryCallbacks callbacks) {
        mWiredAccessoryCallbacks = callbacks;
    }

    public void start() {
        Slog.i(TAG, "Starting input manager");
        nativeStart(mPtr);

        // Add ourself to the Watchdog monitors.
        Watchdog.getInstance().addMonitor(this);

        registerPointerSpeedSettingObserver();
        registerShowTouchesSettingObserver();
        registerAccessibilityLargePointerSettingObserver();

        mContext.registerReceiver(new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                updatePointerSpeedFromSettings();
                updateShowTouchesFromSettings();
                updateAccessibilityLargePointerFromSettings();
            }
        }, new IntentFilter(Intent.ACTION_USER_SWITCHED), null, mHandler);

        updatePointerSpeedFromSettings();
        updateShowTouchesFromSettings();
        updateAccessibilityLargePointerFromSettings();
    }

    // TODO(BT) Pass in parameter for bluetooth system
    public void systemRunning() {
        if (DEBUG) {
            Slog.d(TAG, "System ready.");
        }
        mNotificationManager = (NotificationManager)mContext.getSystemService(
                Context.NOTIFICATION_SERVICE);
        mSystemReady = true;

        IntentFilter filter = new IntentFilter(Intent.ACTION_PACKAGE_ADDED);
        filter.addAction(Intent.ACTION_PACKAGE_REMOVED);
        filter.addAction(Intent.ACTION_PACKAGE_CHANGED);
        filter.addAction(Intent.ACTION_PACKAGE_REPLACED);
        filter.addDataScheme("package");
        mContext.registerReceiver(new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                updateKeyboardLayouts();
            }
        }, filter, null, mHandler);

        filter = new IntentFilter(BluetoothDevice.ACTION_ALIAS_CHANGED);
        mContext.registerReceiver(new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                reloadDeviceAliases();
            }
        }, filter, null, mHandler);

        mHandler.sendEmptyMessage(MSG_RELOAD_DEVICE_ALIASES);
        mHandler.sendEmptyMessage(MSG_UPDATE_KEYBOARD_LAYOUTS);

        if (mWiredAccessoryCallbacks != null) {
            mWiredAccessoryCallbacks.systemReady();
        }
    }

    private void reloadKeyboardLayouts() {
        if (DEBUG) {
            Slog.d(TAG, "Reloading keyboard layouts.");
        }
        nativeReloadKeyboardLayouts(mPtr);
    }

    private void reloadDeviceAliases() {
        if (DEBUG) {
            Slog.d(TAG, "Reloading device names.");
        }
        nativeReloadDeviceAliases(mPtr);
    }

    private void setDisplayViewportsInternal(List<DisplayViewport> viewports) {
        nativeSetDisplayViewports(mPtr, viewports.toArray(new DisplayViewport[0]));
    }

    /**
     * Gets the current state of a key or button by key code.
     * @param deviceId The input device id, or -1 to consult all devices.
     * @param sourceMask The input sources to consult, or {@link InputDevice#SOURCE_ANY} to
     * consider all input sources.  An input device is consulted if at least one of its
     * non-class input source bits matches the specified source mask.
     * @param keyCode The key code to check.
     * @return The key state.
     */
    public int getKeyCodeState(int deviceId, int sourceMask, int keyCode) {
        return nativeGetKeyCodeState(mPtr, deviceId, sourceMask, keyCode);
    }

    /**
     * Gets the current state of a key or button by scan code.
     * @param deviceId The input device id, or -1 to consult all devices.
     * @param sourceMask The input sources to consult, or {@link InputDevice#SOURCE_ANY} to
     * consider all input sources.  An input device is consulted if at least one of its
     * non-class input source bits matches the specified source mask.
     * @param scanCode The scan code to check.
     * @return The key state.
     */
    public int getScanCodeState(int deviceId, int sourceMask, int scanCode) {
        return nativeGetScanCodeState(mPtr, deviceId, sourceMask, scanCode);
    }

    /**
     * Gets the current state of a switch by switch code.
     * @param deviceId The input device id, or -1 to consult all devices.
     * @param sourceMask The input sources to consult, or {@link InputDevice#SOURCE_ANY} to
     * consider all input sources.  An input device is consulted if at least one of its
     * non-class input source bits matches the specified source mask.
     * @param switchCode The switch code to check.
     * @return The switch state.
     */
    public int getSwitchState(int deviceId, int sourceMask, int switchCode) {
        return nativeGetSwitchState(mPtr, deviceId, sourceMask, switchCode);
    }

    /**
     * Determines whether the specified key codes are supported by a particular device.
     * @param deviceId The input device id, or -1 to consult all devices.
     * @param sourceMask The input sources to consult, or {@link InputDevice#SOURCE_ANY} to
     * consider all input sources.  An input device is consulted if at least one of its
     * non-class input source bits matches the specified source mask.
     * @param keyCodes The array of key codes to check.
     * @param keyExists An array at least as large as keyCodes whose entries will be set
     * to true or false based on the presence or absence of support for the corresponding
     * key codes.
     * @return True if the lookup was successful, false otherwise.
     */
    @Override // Binder call
    public boolean hasKeys(int deviceId, int sourceMask, int[] keyCodes, boolean[] keyExists) {
        if (keyCodes == null) {
            throw new IllegalArgumentException("keyCodes must not be null.");
        }
        if (keyExists == null || keyExists.length < keyCodes.length) {
            throw new IllegalArgumentException("keyExists must not be null and must be at "
                    + "least as large as keyCodes.");
        }

        return nativeHasKeys(mPtr, deviceId, sourceMask, keyCodes, keyExists);
    }

    /**
     * Creates an input channel that will receive all input from the input dispatcher.
     * @param inputChannelName The input channel name.
     * @param displayId Target display id.
     * @return The input channel.
     */
    public InputChannel monitorInput(String inputChannelName, int displayId) {
        if (inputChannelName == null) {
            throw new IllegalArgumentException("inputChannelName must not be null.");
        }

        if (displayId < Display.DEFAULT_DISPLAY) {
            throw new IllegalArgumentException("displayId must >= 0.");
        }

        InputChannel[] inputChannels = InputChannel.openInputChannelPair(inputChannelName);
        nativeRegisterInputChannel(mPtr, inputChannels[0], displayId);
        inputChannels[0].dispose(); // don't need to retain the Java object reference
        return inputChannels[1];
    }

    /**
     * Registers an input channel so that it can be used as an input event target.
     * @param inputChannel The input channel to register.
     * @param inputWindowHandle The handle of the input window associated with the
     * input channel, or null if none.
     */
    public void registerInputChannel(InputChannel inputChannel, IBinder token) {
        if (inputChannel == null) {
            throw new IllegalArgumentException("inputChannel must not be null.");
        }

        if (token == null) {
            token = new Binder();
        }
        inputChannel.setToken(token);

        nativeRegisterInputChannel(mPtr, inputChannel, Display.INVALID_DISPLAY);
    }

    /**
     * Unregisters an input channel.
     * @param inputChannel The input channel to unregister.
     */
    public void unregisterInputChannel(InputChannel inputChannel) {
        if (inputChannel == null) {
            throw new IllegalArgumentException("inputChannel must not be null.");
        }

        nativeUnregisterInputChannel(mPtr, inputChannel);
    }

    /**
     * Sets an input filter that will receive all input events before they are dispatched.
     * The input filter may then reinterpret input events or inject new ones.
     *
     * To ensure consistency, the input dispatcher automatically drops all events
     * in progress whenever an input filter is installed or uninstalled.  After an input
     * filter is uninstalled, it can no longer send input events unless it is reinstalled.
     * Any events it attempts to send after it has been uninstalled will be dropped.
     *
     * @param filter The input filter, or null to remove the current filter.
     */
    public void setInputFilter(IInputFilter filter) {
        synchronized (mInputFilterLock) {
            final IInputFilter oldFilter = mInputFilter;
            if (oldFilter == filter) {
                return; // nothing to do
            }

            if (oldFilter != null) {
                mInputFilter = null;
                mInputFilterHost.disconnectLocked();
                mInputFilterHost = null;
                try {
                    oldFilter.uninstall();
                } catch (RemoteException re) {
                    /* ignore */
                }
            }

            if (filter != null) {
                mInputFilter = filter;
                mInputFilterHost = new InputFilterHost();
                try {
                    filter.install(mInputFilterHost);
                } catch (RemoteException re) {
                    /* ignore */
                }
            }

            nativeSetInputFilterEnabled(mPtr, filter != null);
        }
    }

    @Override // Binder call
    public boolean injectInputEvent(InputEvent event, int mode) {
        return injectInputEventInternal(event, mode);
    }

    private boolean injectInputEventInternal(InputEvent event, int mode) {
        if (event == null) {
            throw new IllegalArgumentException("event must not be null");
        }
        if (mode != InputManager.INJECT_INPUT_EVENT_MODE_ASYNC
                && mode != InputManager.INJECT_INPUT_EVENT_MODE_WAIT_FOR_FINISH
                && mode != InputManager.INJECT_INPUT_EVENT_MODE_WAIT_FOR_RESULT) {
            throw new IllegalArgumentException("mode is invalid");
        }

        final int pid = Binder.getCallingPid();
        final int uid = Binder.getCallingUid();
        final long ident = Binder.clearCallingIdentity();
        final int result;
        try {
            result = nativeInjectInputEvent(mPtr, event, pid, uid, mode,
                    INJECTION_TIMEOUT_MILLIS, WindowManagerPolicy.FLAG_DISABLE_KEY_REPEAT);
        } finally {
            Binder.restoreCallingIdentity(ident);
        }
        switch (result) {
            case INPUT_EVENT_INJECTION_PERMISSION_DENIED:
                Slog.w(TAG, "Input event injection from pid " + pid + " permission denied.");
                throw new SecurityException(
                        "Injecting to another application requires INJECT_EVENTS permission");
            case INPUT_EVENT_INJECTION_SUCCEEDED:
                return true;
            case INPUT_EVENT_INJECTION_TIMED_OUT:
                Slog.w(TAG, "Input event injection from pid " + pid + " timed out.");
                return false;
            case INPUT_EVENT_INJECTION_FAILED:
            default:
                Slog.w(TAG, "Input event injection from pid " + pid + " failed.");
                return false;
        }
    }

    /**
     * Gets information about the input device with the specified id.
     * @param deviceId The device id.
     * @return The input device or null if not found.
     */
    @Override // Binder call
    public InputDevice getInputDevice(int deviceId) {
        synchronized (mInputDevicesLock) {
            final int count = mInputDevices.length;
            for (int i = 0; i < count; i++) {
                final InputDevice inputDevice = mInputDevices[i];
                if (inputDevice.getId() == deviceId) {
                    return inputDevice;
                }
            }
        }
        return null;
    }

    // Binder call
    @Override
    public boolean isInputDeviceEnabled(int deviceId) {
        return nativeIsInputDeviceEnabled(mPtr, deviceId);
    }

    // Binder call
    @Override
    public void enableInputDevice(int deviceId) {
        if (!checkCallingPermission(android.Manifest.permission.DISABLE_INPUT_DEVICE,
                "enableInputDevice()")) {
            throw new SecurityException("Requires DISABLE_INPUT_DEVICE permission");
        }
        nativeEnableInputDevice(mPtr, deviceId);
    }

    // Binder call
    @Override
    public void disableInputDevice(int deviceId) {
        if (!checkCallingPermission(android.Manifest.permission.DISABLE_INPUT_DEVICE,
                "disableInputDevice()")) {
            throw new SecurityException("Requires DISABLE_INPUT_DEVICE permission");
        }
        nativeDisableInputDevice(mPtr, deviceId);
    }

    /**
     * Gets the ids of all input devices in the system.
     * @return The input device ids.
     */
    @Override // Binder call
    public int[] getInputDeviceIds() {
        synchronized (mInputDevicesLock) {
            final int count = mInputDevices.length;
            int[] ids = new int[count];
            for (int i = 0; i < count; i++) {
                ids[i] = mInputDevices[i].getId();
            }
            return ids;
        }
    }

    /**
     * Gets all input devices in the system.
     * @return The array of input devices.
     */
    public InputDevice[] getInputDevices() {
        synchronized (mInputDevicesLock) {
            return mInputDevices;
        }
    }

    @Override // Binder call
    public void registerInputDevicesChangedListener(IInputDevicesChangedListener listener) {
        if (listener == null) {
            throw new IllegalArgumentException("listener must not be null");
        }

        synchronized (mInputDevicesLock) {
            int callingPid = Binder.getCallingPid();
            if (mInputDevicesChangedListeners.get(callingPid) != null) {
                throw new SecurityException("The calling process has already "
                        + "registered an InputDevicesChangedListener.");
            }

            InputDevicesChangedListenerRecord record =
                    new InputDevicesChangedListenerRecord(callingPid, listener);
            try {
                IBinder binder = listener.asBinder();
                binder.linkToDeath(record, 0);
            } catch (RemoteException ex) {
                // give up
                throw new RuntimeException(ex);
            }

            mInputDevicesChangedListeners.put(callingPid, record);
        }
    }

    private void onInputDevicesChangedListenerDied(int pid) {
        synchronized (mInputDevicesLock) {
            mInputDevicesChangedListeners.remove(pid);
        }
    }

    // Must be called on handler.
    private void deliverInputDevicesChanged(InputDevice[] oldInputDevices) {
        // Scan for changes.
        int numFullKeyboardsAdded = 0;
        mTempInputDevicesChangedListenersToNotify.clear();
        mTempFullKeyboards.clear();
        final int numListeners;
        final int[] deviceIdAndGeneration;
        synchronized (mInputDevicesLock) {
            if (!mInputDevicesChangedPending) {
                return;
            }
            mInputDevicesChangedPending = false;

            numListeners = mInputDevicesChangedListeners.size();
            for (int i = 0; i < numListeners; i++) {
                mTempInputDevicesChangedListenersToNotify.add(
                        mInputDevicesChangedListeners.valueAt(i));
            }

            final int numDevices = mInputDevices.length;
            deviceIdAndGeneration = new int[numDevices * 2];
            for (int i = 0; i < numDevices; i++) {
                final InputDevice inputDevice = mInputDevices[i];
                deviceIdAndGeneration[i * 2] = inputDevice.getId();
                deviceIdAndGeneration[i * 2 + 1] = inputDevice.getGeneration();

                if (!inputDevice.isVirtual() && inputDevice.isFullKeyboard()) {
                    if (!containsInputDeviceWithDescriptor(oldInputDevices,
                            inputDevice.getDescriptor())) {
                        mTempFullKeyboards.add(numFullKeyboardsAdded++, inputDevice);
                    } else {
                        mTempFullKeyboards.add(inputDevice);
                    }
                }
            }
        }

        // Notify listeners.
        for (int i = 0; i < numListeners; i++) {
            mTempInputDevicesChangedListenersToNotify.get(i).notifyInputDevicesChanged(
                    deviceIdAndGeneration);
        }
        mTempInputDevicesChangedListenersToNotify.clear();

        // Check for missing keyboard layouts.
        List<InputDevice> keyboardsMissingLayout = new ArrayList<>();
        final int numFullKeyboards = mTempFullKeyboards.size();
        synchronized (mDataStore) {
            for (int i = 0; i < numFullKeyboards; i++) {
                final InputDevice inputDevice = mTempFullKeyboards.get(i);
                String layout =
                    getCurrentKeyboardLayoutForInputDevice(inputDevice.getIdentifier());
                if (layout == null) {
                    layout = getDefaultKeyboardLayout(inputDevice);
                    if (layout != null) {
                        setCurrentKeyboardLayoutForInputDevice(
                                inputDevice.getIdentifier(), layout);
                    }
                }
                if (layout == null) {
                    keyboardsMissingLayout.add(inputDevice);
                }
            }
        }

        if (mNotificationManager != null) {
            if (!keyboardsMissingLayout.isEmpty()) {
                if (keyboardsMissingLayout.size() > 1) {
                    // We have more than one keyboard missing a layout, so drop the
                    // user at the generic input methods page so they can pick which
                    // one to set.
                    showMissingKeyboardLayoutNotification(null);
                } else {
                    showMissingKeyboardLayoutNotification(keyboardsMissingLayout.get(0));
                }
            } else if (mKeyboardLayoutNotificationShown) {
                hideMissingKeyboardLayoutNotification();
            }
        }
        mTempFullKeyboards.clear();
    }

    private String getDefaultKeyboardLayout(final InputDevice d) {
        final Locale systemLocale = mContext.getResources().getConfiguration().locale;
        // If our locale doesn't have a language for some reason, then we don't really have a
        // reasonable default.
        if (TextUtils.isEmpty(systemLocale.getLanguage())) {
            return null;
        }
        final List<KeyboardLayout> layouts = new ArrayList<>();
        visitAllKeyboardLayouts(new KeyboardLayoutVisitor() {
            @Override
            public void visitKeyboardLayout(Resources resources,
                    int keyboardLayoutResId, KeyboardLayout layout) {
                // Only select a default when we know the layout is appropriate. For now, this
                // means its a custom layout for a specific keyboard.
                if (layout.getVendorId() != d.getVendorId()
                        || layout.getProductId() != d.getProductId()) {
                    return;
                }
                final LocaleList locales = layout.getLocales();
                final int numLocales = locales.size();
                for (int localeIndex = 0; localeIndex < numLocales; ++localeIndex) {
                    if (isCompatibleLocale(systemLocale, locales.get(localeIndex))) {
                        layouts.add(layout);
                        break;
                    }
                }
            }
        });

        if (layouts.isEmpty()) {
            return null;
        }

        // First sort so that ones with higher priority are listed at the top
        Collections.sort(layouts);
        // Next we want to try to find an exact match of language, country and variant.
        final int N = layouts.size();
        for (int i = 0; i < N; i++) {
            KeyboardLayout layout = layouts.get(i);
            final LocaleList locales = layout.getLocales();
            final int numLocales = locales.size();
            for (int localeIndex = 0; localeIndex < numLocales; ++localeIndex) {
                final Locale locale = locales.get(localeIndex);
                if (locale.getCountry().equals(systemLocale.getCountry())
                        && locale.getVariant().equals(systemLocale.getVariant())) {
                    return layout.getDescriptor();
                }
            }
        }
        // Then try an exact match of language and country
        for (int i = 0; i < N; i++) {
            KeyboardLayout layout = layouts.get(i);
            final LocaleList locales = layout.getLocales();
            final int numLocales = locales.size();
            for (int localeIndex = 0; localeIndex < numLocales; ++localeIndex) {
                final Locale locale = locales.get(localeIndex);
                if (locale.getCountry().equals(systemLocale.getCountry())) {
                    return layout.getDescriptor();
                }
            }
        }

        // Give up and just use the highest priority layout with matching language
        return layouts.get(0).getDescriptor();
    }

    private static boolean isCompatibleLocale(Locale systemLocale, Locale keyboardLocale) {
        // Different languages are never compatible
        if (!systemLocale.getLanguage().equals(keyboardLocale.getLanguage())) {
            return false;
        }
        // If both the system and the keyboard layout have a country specifier, they must be equal.
        if (!TextUtils.isEmpty(systemLocale.getCountry())
                && !TextUtils.isEmpty(keyboardLocale.getCountry())
                && !systemLocale.getCountry().equals(keyboardLocale.getCountry())) {
            return false;
        }
        return true;
    }

    @Override // Binder call & native callback
    public TouchCalibration getTouchCalibrationForInputDevice(String inputDeviceDescriptor,
            int surfaceRotation) {
        if (inputDeviceDescriptor == null) {
            throw new IllegalArgumentException("inputDeviceDescriptor must not be null");
        }

        synchronized (mDataStore) {
            return mDataStore.getTouchCalibration(inputDeviceDescriptor, surfaceRotation);
        }
    }

    @Override // Binder call
    public void setTouchCalibrationForInputDevice(String inputDeviceDescriptor, int surfaceRotation,
            TouchCalibration calibration) {
        if (!checkCallingPermission(android.Manifest.permission.SET_INPUT_CALIBRATION,
                "setTouchCalibrationForInputDevice()")) {
            throw new SecurityException("Requires SET_INPUT_CALIBRATION permission");
        }
        if (inputDeviceDescriptor == null) {
            throw new IllegalArgumentException("inputDeviceDescriptor must not be null");
        }
        if (calibration == null) {
            throw new IllegalArgumentException("calibration must not be null");
        }
        if (surfaceRotation < Surface.ROTATION_0 || surfaceRotation > Surface.ROTATION_270) {
            throw new IllegalArgumentException("surfaceRotation value out of bounds");
        }

        synchronized (mDataStore) {
            try {
                if (mDataStore.setTouchCalibration(inputDeviceDescriptor, surfaceRotation,
                        calibration)) {
                    nativeReloadCalibration(mPtr);
                }
            } finally {
                mDataStore.saveIfNeeded();
            }
        }
    }

    @Override // Binder call
    public int isInTabletMode() {
        if (!checkCallingPermission(android.Manifest.permission.TABLET_MODE,
                "isInTabletMode()")) {
            throw new SecurityException("Requires TABLET_MODE permission");
        }
        return getSwitchState(-1, InputDevice.SOURCE_ANY, SW_TABLET_MODE);
    }

    @Override // Binder call
    public void registerTabletModeChangedListener(ITabletModeChangedListener listener) {
        if (!checkCallingPermission(android.Manifest.permission.TABLET_MODE,
                "registerTabletModeChangedListener()")) {
            throw new SecurityException("Requires TABLET_MODE_LISTENER permission");
        }
        if (listener == null) {
            throw new IllegalArgumentException("listener must not be null");
        }

        synchronized (mTabletModeLock) {
            final int callingPid = Binder.getCallingPid();
            if (mTabletModeChangedListeners.get(callingPid) != null) {
                throw new IllegalStateException("The calling process has already registered "
                        + "a TabletModeChangedListener.");
            }
            TabletModeChangedListenerRecord record =
                    new TabletModeChangedListenerRecord(callingPid, listener);
            try {
                IBinder binder = listener.asBinder();
                binder.linkToDeath(record, 0);
            } catch (RemoteException ex) {
                throw new RuntimeException(ex);
            }
            mTabletModeChangedListeners.put(callingPid, record);
        }
    }

    private void onTabletModeChangedListenerDied(int pid) {
        synchronized (mTabletModeLock) {
            mTabletModeChangedListeners.remove(pid);
        }
    }

    // Must be called on handler
    private void deliverTabletModeChanged(long whenNanos, boolean inTabletMode) {
        mTempTabletModeChangedListenersToNotify.clear();
        final int numListeners;
        synchronized (mTabletModeLock) {
            numListeners = mTabletModeChangedListeners.size();
            for (int i = 0; i < numListeners; i++) {
                mTempTabletModeChangedListenersToNotify.add(
                        mTabletModeChangedListeners.valueAt(i));
            }
        }
        for (int i = 0; i < numListeners; i++) {
            mTempTabletModeChangedListenersToNotify.get(i).notifyTabletModeChanged(
                    whenNanos, inTabletMode);
        }
    }

    // Must be called on handler.
    private void showMissingKeyboardLayoutNotification(InputDevice device) {
        if (!mKeyboardLayoutNotificationShown) {
            final Intent intent = new Intent(Settings.ACTION_HARD_KEYBOARD_SETTINGS);
            if (device != null) {
                intent.putExtra(Settings.EXTRA_INPUT_DEVICE_IDENTIFIER, device.getIdentifier());
            }
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
                    | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED
                    | Intent.FLAG_ACTIVITY_CLEAR_TOP);
            final PendingIntent keyboardLayoutIntent = PendingIntent.getActivityAsUser(mContext, 0,
                    intent, 0, null, UserHandle.CURRENT);

            Resources r = mContext.getResources();
            Notification notification =
                    new Notification.Builder(mContext, SystemNotificationChannels.PHYSICAL_KEYBOARD)
                            .setContentTitle(r.getString(
                                    R.string.select_keyboard_layout_notification_title))
                            .setContentText(r.getString(
                                    R.string.select_keyboard_layout_notification_message))
                            .setContentIntent(keyboardLayoutIntent)
                            .setSmallIcon(R.drawable.ic_settings_language)
                            .setColor(mContext.getColor(
                                    com.android.internal.R.color.system_notification_accent_color))
                            .build();
            mNotificationManager.notifyAsUser(null,
                    SystemMessage.NOTE_SELECT_KEYBOARD_LAYOUT,
                    notification, UserHandle.ALL);
            mKeyboardLayoutNotificationShown = true;
        }
    }

    // Must be called on handler.
    private void hideMissingKeyboardLayoutNotification() {
        if (mKeyboardLayoutNotificationShown) {
            mKeyboardLayoutNotificationShown = false;
            mNotificationManager.cancelAsUser(null,
                    SystemMessage.NOTE_SELECT_KEYBOARD_LAYOUT,
                    UserHandle.ALL);
        }
    }

    // Must be called on handler.
    private void updateKeyboardLayouts() {
        // Scan all input devices state for keyboard layouts that have been uninstalled.
        final HashSet<String> availableKeyboardLayouts = new HashSet<String>();
        visitAllKeyboardLayouts(new KeyboardLayoutVisitor() {
            @Override
            public void visitKeyboardLayout(Resources resources,
                    int keyboardLayoutResId, KeyboardLayout layout) {
                availableKeyboardLayouts.add(layout.getDescriptor());
            }
        });
        synchronized (mDataStore) {
            try {
                mDataStore.removeUninstalledKeyboardLayouts(availableKeyboardLayouts);
            } finally {
                mDataStore.saveIfNeeded();
            }
        }

        // Reload keyboard layouts.
        reloadKeyboardLayouts();
    }

    private static boolean containsInputDeviceWithDescriptor(InputDevice[] inputDevices,
            String descriptor) {
        final int numDevices = inputDevices.length;
        for (int i = 0; i < numDevices; i++) {
            final InputDevice inputDevice = inputDevices[i];
            if (inputDevice.getDescriptor().equals(descriptor)) {
                return true;
            }
        }
        return false;
    }

    @Override // Binder call
    public KeyboardLayout[] getKeyboardLayouts() {
        final ArrayList<KeyboardLayout> list = new ArrayList<KeyboardLayout>();
        visitAllKeyboardLayouts(new KeyboardLayoutVisitor() {
            @Override
            public void visitKeyboardLayout(Resources resources,
                    int keyboardLayoutResId, KeyboardLayout layout) {
                list.add(layout);
            }
        });
        return list.toArray(new KeyboardLayout[list.size()]);
    }

    @Override // Binder call
    public KeyboardLayout[] getKeyboardLayoutsForInputDevice(
            final InputDeviceIdentifier identifier) {
        final String[] enabledLayoutDescriptors =
            getEnabledKeyboardLayoutsForInputDevice(identifier);
        final ArrayList<KeyboardLayout> enabledLayouts =
            new ArrayList<KeyboardLayout>(enabledLayoutDescriptors.length);
        final ArrayList<KeyboardLayout> potentialLayouts = new ArrayList<KeyboardLayout>();
        visitAllKeyboardLayouts(new KeyboardLayoutVisitor() {
            boolean mHasSeenDeviceSpecificLayout;

            @Override
            public void visitKeyboardLayout(Resources resources,
                    int keyboardLayoutResId, KeyboardLayout layout) {
                // First check if it's enabled. If the keyboard layout is enabled then we always
                // want to return it as a possible layout for the device.
                for (String s : enabledLayoutDescriptors) {
                    if (s != null && s.equals(layout.getDescriptor())) {
                        enabledLayouts.add(layout);
                        return;
                    }
                }
                // Next find any potential layouts that aren't yet enabled for the device. For
                // devices that have special layouts we assume there's a reason that the generic
                // layouts don't work for them so we don't want to return them since it's likely
                // to result in a poor user experience.
                if (layout.getVendorId() == identifier.getVendorId()
                        && layout.getProductId() == identifier.getProductId()) {
                    if (!mHasSeenDeviceSpecificLayout) {
                        mHasSeenDeviceSpecificLayout = true;
                        potentialLayouts.clear();
                    }
                    potentialLayouts.add(layout);
                } else if (layout.getVendorId() == -1 && layout.getProductId() == -1
                        && !mHasSeenDeviceSpecificLayout) {
                    potentialLayouts.add(layout);
                }
            }
        });
        final int enabledLayoutSize = enabledLayouts.size();
        final int potentialLayoutSize = potentialLayouts.size();
        KeyboardLayout[] layouts = new KeyboardLayout[enabledLayoutSize + potentialLayoutSize];
        enabledLayouts.toArray(layouts);
        for (int i = 0; i < potentialLayoutSize; i++) {
            layouts[enabledLayoutSize + i] = potentialLayouts.get(i);
        }
        return layouts;
    }

    @Override // Binder call
    public KeyboardLayout getKeyboardLayout(String keyboardLayoutDescriptor) {
        if (keyboardLayoutDescriptor == null) {
            throw new IllegalArgumentException("keyboardLayoutDescriptor must not be null");
        }

        final KeyboardLayout[] result = new KeyboardLayout[1];
        visitKeyboardLayout(keyboardLayoutDescriptor, new KeyboardLayoutVisitor() {
            @Override
            public void visitKeyboardLayout(Resources resources,
                    int keyboardLayoutResId, KeyboardLayout layout) {
                result[0] = layout;
            }
        });
        if (result[0] == null) {
            Slog.w(TAG, "Could not get keyboard layout with descriptor '"
                    + keyboardLayoutDescriptor + "'.");
        }
        return result[0];
    }

    private void visitAllKeyboardLayouts(KeyboardLayoutVisitor visitor) {
        final PackageManager pm = mContext.getPackageManager();
        Intent intent = new Intent(InputManager.ACTION_QUERY_KEYBOARD_LAYOUTS);
        for (ResolveInfo resolveInfo : pm.queryBroadcastReceivers(intent,
                PackageManager.GET_META_DATA | PackageManager.MATCH_DIRECT_BOOT_AWARE
                        | PackageManager.MATCH_DIRECT_BOOT_UNAWARE)) {
            final ActivityInfo activityInfo = resolveInfo.activityInfo;
            final int priority = resolveInfo.priority;
            visitKeyboardLayoutsInPackage(pm, activityInfo, null, priority, visitor);
        }
    }

    private void visitKeyboardLayout(String keyboardLayoutDescriptor,
            KeyboardLayoutVisitor visitor) {
        KeyboardLayoutDescriptor d = KeyboardLayoutDescriptor.parse(keyboardLayoutDescriptor);
        if (d != null) {
            final PackageManager pm = mContext.getPackageManager();
            try {
                ActivityInfo receiver = pm.getReceiverInfo(
                        new ComponentName(d.packageName, d.receiverName),
                        PackageManager.GET_META_DATA
                                | PackageManager.MATCH_DIRECT_BOOT_AWARE
                                | PackageManager.MATCH_DIRECT_BOOT_UNAWARE);
                visitKeyboardLayoutsInPackage(pm, receiver, d.keyboardLayoutName, 0, visitor);
            } catch (NameNotFoundException ex) {
            }
        }
    }

    private void visitKeyboardLayoutsInPackage(PackageManager pm, ActivityInfo receiver,
            String keyboardName, int requestedPriority, KeyboardLayoutVisitor visitor) {
        Bundle metaData = receiver.metaData;
        if (metaData == null) {
            return;
        }

        int configResId = metaData.getInt(InputManager.META_DATA_KEYBOARD_LAYOUTS);
        if (configResId == 0) {
            Slog.w(TAG, "Missing meta-data '" + InputManager.META_DATA_KEYBOARD_LAYOUTS
                    + "' on receiver " + receiver.packageName + "/" + receiver.name);
            return;
        }

        CharSequence receiverLabel = receiver.loadLabel(pm);
        String collection = receiverLabel != null ? receiverLabel.toString() : "";
        int priority;
        if ((receiver.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
            priority = requestedPriority;
        } else {
            priority = 0;
        }

        try {
            Resources resources = pm.getResourcesForApplication(receiver.applicationInfo);
            XmlResourceParser parser = resources.getXml(configResId);
            try {
                XmlUtils.beginDocument(parser, "keyboard-layouts");

                for (;;) {
                    XmlUtils.nextElement(parser);
                    String element = parser.getName();
                    if (element == null) {
                        break;
                    }
                    if (element.equals("keyboard-layout")) {
                        TypedArray a = resources.obtainAttributes(
                                parser, com.android.internal.R.styleable.KeyboardLayout);
                        try {
                            String name = a.getString(
                                    com.android.internal.R.styleable.KeyboardLayout_name);
                            String label = a.getString(
                                    com.android.internal.R.styleable.KeyboardLayout_label);
                            int keyboardLayoutResId = a.getResourceId(
                                    com.android.internal.R.styleable.KeyboardLayout_keyboardLayout,
                                    0);
                            String languageTags = a.getString(
                                    com.android.internal.R.styleable.KeyboardLayout_locale);
                            LocaleList locales = getLocalesFromLanguageTags(languageTags);
                            int vid = a.getInt(
                                    com.android.internal.R.styleable.KeyboardLayout_vendorId, -1);
                            int pid = a.getInt(
                                    com.android.internal.R.styleable.KeyboardLayout_productId, -1);

                            if (name == null || label == null || keyboardLayoutResId == 0) {
                                Slog.w(TAG, "Missing required 'name', 'label' or 'keyboardLayout' "
                                        + "attributes in keyboard layout "
                                        + "resource from receiver "
                                        + receiver.packageName + "/" + receiver.name);
                            } else {
                                String descriptor = KeyboardLayoutDescriptor.format(
                                        receiver.packageName, receiver.name, name);
                                if (keyboardName == null || name.equals(keyboardName)) {
                                    KeyboardLayout layout = new KeyboardLayout(
                                            descriptor, label, collection, priority,
                                            locales, vid, pid);
                                    visitor.visitKeyboardLayout(
                                            resources, keyboardLayoutResId, layout);
                                }
                            }
                        } finally {
                            a.recycle();
                        }
                    } else {
                        Slog.w(TAG, "Skipping unrecognized element '" + element
                                + "' in keyboard layout resource from receiver "
                                + receiver.packageName + "/" + receiver.name);
                    }
                }
            } finally {
                parser.close();
            }
        } catch (Exception ex) {
            Slog.w(TAG, "Could not parse keyboard layout resource from receiver "
                    + receiver.packageName + "/" + receiver.name, ex);
        }
    }

    @NonNull
    private static LocaleList getLocalesFromLanguageTags(String languageTags) {
        if (TextUtils.isEmpty(languageTags)) {
            return LocaleList.getEmptyLocaleList();
        }
        return LocaleList.forLanguageTags(languageTags.replace('|', ','));
    }

    /**
     * Builds a layout descriptor for the vendor/product. This returns the
     * descriptor for ids that aren't useful (such as the default 0, 0).
     */
    private String getLayoutDescriptor(InputDeviceIdentifier identifier) {
        if (identifier == null || identifier.getDescriptor() == null) {
            throw new IllegalArgumentException("identifier and descriptor must not be null");
        }

        if (identifier.getVendorId() == 0 && identifier.getProductId() == 0) {
            return identifier.getDescriptor();
        }
        StringBuilder bob = new StringBuilder();
        bob.append("vendor:").append(identifier.getVendorId());
        bob.append(",product:").append(identifier.getProductId());
        return bob.toString();
    }

    @Override // Binder call
    public String getCurrentKeyboardLayoutForInputDevice(InputDeviceIdentifier identifier) {

        String key = getLayoutDescriptor(identifier);
        synchronized (mDataStore) {
            String layout = null;
            // try loading it using the layout descriptor if we have it
            layout = mDataStore.getCurrentKeyboardLayout(key);
            if (layout == null && !key.equals(identifier.getDescriptor())) {
                // if it doesn't exist fall back to the device descriptor
                layout = mDataStore.getCurrentKeyboardLayout(identifier.getDescriptor());
            }
            if (DEBUG) {
                Slog.d(TAG, "Loaded keyboard layout id for " + key + " and got "
                        + layout);
            }
            return layout;
        }
    }

    @Override // Binder call
    public void setCurrentKeyboardLayoutForInputDevice(InputDeviceIdentifier identifier,
            String keyboardLayoutDescriptor) {
        if (!checkCallingPermission(android.Manifest.permission.SET_KEYBOARD_LAYOUT,
                "setCurrentKeyboardLayoutForInputDevice()")) {
            throw new SecurityException("Requires SET_KEYBOARD_LAYOUT permission");
        }
        if (keyboardLayoutDescriptor == null) {
            throw new IllegalArgumentException("keyboardLayoutDescriptor must not be null");
        }

        String key = getLayoutDescriptor(identifier);
        synchronized (mDataStore) {
            try {
                if (mDataStore.setCurrentKeyboardLayout(key, keyboardLayoutDescriptor)) {
                    if (DEBUG) {
                        Slog.d(TAG, "Saved keyboard layout using " + key);
                    }
                    mHandler.sendEmptyMessage(MSG_RELOAD_KEYBOARD_LAYOUTS);
                }
            } finally {
                mDataStore.saveIfNeeded();
            }
        }
    }

    @Override // Binder call
    public String[] getEnabledKeyboardLayoutsForInputDevice(InputDeviceIdentifier identifier) {
        String key = getLayoutDescriptor(identifier);
        synchronized (mDataStore) {
            String[] layouts = mDataStore.getKeyboardLayouts(key);
            if ((layouts == null || layouts.length == 0)
                    && !key.equals(identifier.getDescriptor())) {
                layouts = mDataStore.getKeyboardLayouts(identifier.getDescriptor());
            }
            return layouts;
        }
    }

    @Override // Binder call
    public void addKeyboardLayoutForInputDevice(InputDeviceIdentifier identifier,
            String keyboardLayoutDescriptor) {
        if (!checkCallingPermission(android.Manifest.permission.SET_KEYBOARD_LAYOUT,
                "addKeyboardLayoutForInputDevice()")) {
            throw new SecurityException("Requires SET_KEYBOARD_LAYOUT permission");
        }
        if (keyboardLayoutDescriptor == null) {
            throw new IllegalArgumentException("keyboardLayoutDescriptor must not be null");
        }

        String key = getLayoutDescriptor(identifier);
        synchronized (mDataStore) {
            try {
                String oldLayout = mDataStore.getCurrentKeyboardLayout(key);
                if (oldLayout == null && !key.equals(identifier.getDescriptor())) {
                    oldLayout = mDataStore.getCurrentKeyboardLayout(identifier.getDescriptor());
                }
                if (mDataStore.addKeyboardLayout(key, keyboardLayoutDescriptor)
                        && !Objects.equals(oldLayout,
                                mDataStore.getCurrentKeyboardLayout(key))) {
                    mHandler.sendEmptyMessage(MSG_RELOAD_KEYBOARD_LAYOUTS);
                }
            } finally {
                mDataStore.saveIfNeeded();
            }
        }
    }

    @Override // Binder call
    public void removeKeyboardLayoutForInputDevice(InputDeviceIdentifier identifier,
            String keyboardLayoutDescriptor) {
        if (!checkCallingPermission(android.Manifest.permission.SET_KEYBOARD_LAYOUT,
                "removeKeyboardLayoutForInputDevice()")) {
            throw new SecurityException("Requires SET_KEYBOARD_LAYOUT permission");
        }
        if (keyboardLayoutDescriptor == null) {
            throw new IllegalArgumentException("keyboardLayoutDescriptor must not be null");
        }

        String key = getLayoutDescriptor(identifier);
        synchronized (mDataStore) {
            try {
                String oldLayout = mDataStore.getCurrentKeyboardLayout(key);
                if (oldLayout == null && !key.equals(identifier.getDescriptor())) {
                    oldLayout = mDataStore.getCurrentKeyboardLayout(identifier.getDescriptor());
                }
                boolean removed = mDataStore.removeKeyboardLayout(key, keyboardLayoutDescriptor);
                if (!key.equals(identifier.getDescriptor())) {
                    // We need to remove from both places to ensure it is gone
                    removed |= mDataStore.removeKeyboardLayout(identifier.getDescriptor(),
                            keyboardLayoutDescriptor);
                }
                if (removed && !Objects.equals(oldLayout,
                                mDataStore.getCurrentKeyboardLayout(key))) {
                    mHandler.sendEmptyMessage(MSG_RELOAD_KEYBOARD_LAYOUTS);
                }
            } finally {
                mDataStore.saveIfNeeded();
            }
        }
    }

    public void switchKeyboardLayout(int deviceId, int direction) {
        mHandler.obtainMessage(MSG_SWITCH_KEYBOARD_LAYOUT, deviceId, direction).sendToTarget();
    }

    // Must be called on handler.
    private void handleSwitchKeyboardLayout(int deviceId, int direction) {
        final InputDevice device = getInputDevice(deviceId);
        if (device != null) {
            final boolean changed;
            final String keyboardLayoutDescriptor;

            String key = getLayoutDescriptor(device.getIdentifier());
            synchronized (mDataStore) {
                try {
                    changed = mDataStore.switchKeyboardLayout(key, direction);
                    keyboardLayoutDescriptor = mDataStore.getCurrentKeyboardLayout(
                            key);
                } finally {
                    mDataStore.saveIfNeeded();
                }
            }

            if (changed) {
                if (mSwitchedKeyboardLayoutToast != null) {
                    mSwitchedKeyboardLayoutToast.cancel();
                    mSwitchedKeyboardLayoutToast = null;
                }
                if (keyboardLayoutDescriptor != null) {
                    KeyboardLayout keyboardLayout = getKeyboardLayout(keyboardLayoutDescriptor);
                    if (keyboardLayout != null) {
                        mSwitchedKeyboardLayoutToast = Toast.makeText(
                                mContext, keyboardLayout.getLabel(), Toast.LENGTH_SHORT);
                        mSwitchedKeyboardLayoutToast.show();
                    }
                }

                reloadKeyboardLayouts();
            }
        }
    }

    public void setFocusedApplication(int displayId, InputApplicationHandle application) {
        nativeSetFocusedApplication(mPtr, displayId, application);
    }

    public void setFocusedDisplay(int displayId) {
        nativeSetFocusedDisplay(mPtr, displayId);
    }

    @Override
    public void requestPointerCapture(IBinder windowToken, boolean enabled) {
        if (mFocusedWindow == null || mFocusedWindow.asBinder() != windowToken) {
            Slog.e(TAG, "requestPointerCapture called for a window that has no focus: "
                    + windowToken);
            return;
        }
        if (mFocusedWindowHasCapture == enabled) {
            Slog.i(TAG, "requestPointerCapture: already " + (enabled ? "enabled" : "disabled"));
            return;
        }
        setPointerCapture(enabled);
    }

    private void setPointerCapture(boolean enabled) {
        if (mFocusedWindowHasCapture != enabled) {
            mFocusedWindowHasCapture = enabled;
            try {
                mFocusedWindow.dispatchPointerCaptureChanged(enabled);
            } catch (RemoteException ex) {
                /* ignore */
            }
            nativeSetPointerCapture(mPtr, enabled);
        }
    }

    public void setInputDispatchMode(boolean enabled, boolean frozen) {
        nativeSetInputDispatchMode(mPtr, enabled, frozen);
    }

    public void setSystemUiVisibility(int visibility) {
        nativeSetSystemUiVisibility(mPtr, visibility);
    }

    /**
     * Atomically transfers touch focus from one window to another as identified by
     * their input channels.  It is possible for multiple windows to have
     * touch focus if they support split touch dispatch
     * {@link android.view.WindowManager.LayoutParams#FLAG_SPLIT_TOUCH} but this
     * method only transfers touch focus of the specified window without affecting
     * other windows that may also have touch focus at the same time.
     * @param fromChannel The channel of a window that currently has touch focus.
     * @param toChannel The channel of the window that should receive touch focus in
     * place of the first.
     * @return True if the transfer was successful.  False if the window with the
     * specified channel did not actually have touch focus at the time of the request.
     */
    public boolean transferTouchFocus(InputChannel fromChannel, InputChannel toChannel) {
        if (fromChannel == null) {
            throw new IllegalArgumentException("fromChannel must not be null.");
        }
        if (toChannel == null) {
            throw new IllegalArgumentException("toChannel must not be null.");
        }
        return nativeTransferTouchFocus(mPtr, fromChannel, toChannel);
    }

    @Override // Binder call
    public void tryPointerSpeed(int speed) {
        if (!checkCallingPermission(android.Manifest.permission.SET_POINTER_SPEED,
                "tryPointerSpeed()")) {
            throw new SecurityException("Requires SET_POINTER_SPEED permission");
        }

        if (speed < InputManager.MIN_POINTER_SPEED || speed > InputManager.MAX_POINTER_SPEED) {
            throw new IllegalArgumentException("speed out of range");
        }

        setPointerSpeedUnchecked(speed);
    }

    public void updatePointerSpeedFromSettings() {
        int speed = getPointerSpeedSetting();
        setPointerSpeedUnchecked(speed);
    }

    private void setPointerSpeedUnchecked(int speed) {
        speed = Math.min(Math.max(speed, InputManager.MIN_POINTER_SPEED),
                InputManager.MAX_POINTER_SPEED);
        nativeSetPointerSpeed(mPtr, speed);
    }

    private void registerPointerSpeedSettingObserver() {
        mContext.getContentResolver().registerContentObserver(
                Settings.System.getUriFor(Settings.System.POINTER_SPEED), true,
                new ContentObserver(mHandler) {
                    @Override
                    public void onChange(boolean selfChange) {
                        updatePointerSpeedFromSettings();
                    }
                }, UserHandle.USER_ALL);
    }

    private int getPointerSpeedSetting() {
        int speed = InputManager.DEFAULT_POINTER_SPEED;
        try {
            speed = Settings.System.getIntForUser(mContext.getContentResolver(),
                    Settings.System.POINTER_SPEED, UserHandle.USER_CURRENT);
        } catch (SettingNotFoundException snfe) {
        }
        return speed;
    }

    public void updateShowTouchesFromSettings() {
        int setting = getShowTouchesSetting(0);
        nativeSetShowTouches(mPtr, setting != 0);
    }

    private void registerShowTouchesSettingObserver() {
        mContext.getContentResolver().registerContentObserver(
                Settings.System.getUriFor(Settings.System.SHOW_TOUCHES), true,
                new ContentObserver(mHandler) {
                    @Override
                    public void onChange(boolean selfChange) {
                        updateShowTouchesFromSettings();
                    }
                }, UserHandle.USER_ALL);
    }

    public void updateAccessibilityLargePointerFromSettings() {
        final int accessibilityConfig = Settings.Secure.getIntForUser(
                mContext.getContentResolver(), Settings.Secure.ACCESSIBILITY_LARGE_POINTER_ICON,
                0, UserHandle.USER_CURRENT);
        PointerIcon.setUseLargeIcons(accessibilityConfig == 1);
        nativeReloadPointerIcons(mPtr);
    }

    private void registerAccessibilityLargePointerSettingObserver() {
        mContext.getContentResolver().registerContentObserver(
                Settings.Secure.getUriFor(Settings.Secure.ACCESSIBILITY_LARGE_POINTER_ICON), true,
                new ContentObserver(mHandler) {
                    @Override
                    public void onChange(boolean selfChange) {
                        updateAccessibilityLargePointerFromSettings();
                    }
                }, UserHandle.USER_ALL);
    }

    private int getShowTouchesSetting(int defaultValue) {
        int result = defaultValue;
        try {
            result = Settings.System.getIntForUser(mContext.getContentResolver(),
                    Settings.System.SHOW_TOUCHES, UserHandle.USER_CURRENT);
        } catch (SettingNotFoundException snfe) {
        }
        return result;
    }

    // Binder call
    @Override
    public void vibrate(int deviceId, long[] pattern, int repeat, IBinder token) {
        if (repeat >= pattern.length) {
            throw new ArrayIndexOutOfBoundsException();
        }

        VibratorToken v;
        synchronized (mVibratorLock) {
            v = mVibratorTokens.get(token);
            if (v == null) {
                v = new VibratorToken(deviceId, token, mNextVibratorTokenValue++);
                try {
                    token.linkToDeath(v, 0);
                } catch (RemoteException ex) {
                    // give up
                    throw new RuntimeException(ex);
                }
                mVibratorTokens.put(token, v);
            }
        }

        synchronized (v) {
            v.mVibrating = true;
            nativeVibrate(mPtr, deviceId, pattern, repeat, v.mTokenValue);
        }
    }

    // Binder call
    @Override
    public void cancelVibrate(int deviceId, IBinder token) {
        VibratorToken v;
        synchronized (mVibratorLock) {
            v = mVibratorTokens.get(token);
            if (v == null || v.mDeviceId != deviceId) {
                return; // nothing to cancel
            }
        }

        cancelVibrateIfNeeded(v);
    }

    void onVibratorTokenDied(VibratorToken v) {
        synchronized (mVibratorLock) {
            mVibratorTokens.remove(v.mToken);
        }

        cancelVibrateIfNeeded(v);
    }

    private void cancelVibrateIfNeeded(VibratorToken v) {
        synchronized (v) {
            if (v.mVibrating) {
                nativeCancelVibrate(mPtr, v.mDeviceId, v.mTokenValue);
                v.mVibrating = false;
            }
        }
    }

    // Binder call
    @Override
    public void setPointerIconType(int iconId) {
        nativeSetPointerIconType(mPtr, iconId);
    }

    // Binder call
    @Override
    public void setCustomPointerIcon(PointerIcon icon) {
        Preconditions.checkNotNull(icon);
        nativeSetCustomPointerIcon(mPtr, icon);
    }

    @Override
    public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
        if (!DumpUtils.checkDumpPermission(mContext, TAG, pw)) return;

        pw.println("INPUT MANAGER (dumpsys input)\n");
        String dumpStr = nativeDump(mPtr);
        if (dumpStr != null) {
            pw.println(dumpStr);
        }
    }

    private boolean checkCallingPermission(String permission, String func) {
        // Quick check: if the calling permission is me, it's all okay.
        if (Binder.getCallingPid() == Process.myPid()) {
            return true;
        }

        if (mContext.checkCallingPermission(permission) == PackageManager.PERMISSION_GRANTED) {
            return true;
        }
        String msg = "Permission Denial: " + func + " from pid="
                + Binder.getCallingPid()
                + ", uid=" + Binder.getCallingUid()
                + " requires " + permission;
        Slog.w(TAG, msg);
        return false;
    }

    // Called by the heartbeat to ensure locks are not held indefinitely (for deadlock detection).
    @Override
    public void monitor() {
        synchronized (mInputFilterLock) { }
        nativeMonitor(mPtr);
    }

    // Binder call
    @Override
    public IInputForwarder createInputForwarder(int displayId) throws RemoteException {
        if (!checkCallingPermission(android.Manifest.permission.INJECT_EVENTS,
                "createInputForwarder()")) {
            throw new SecurityException("Requires INJECT_EVENTS permission");
        }
        final DisplayManager displayManager = mContext.getSystemService(DisplayManager.class);
        final Display display = displayManager.getDisplay(displayId);
        if (display == null) {
            throw new IllegalArgumentException(
                    "Can't create input forwarder for non-existent displayId: " + displayId);
        }
        final int callingUid = Binder.getCallingUid();
        final int displayOwnerUid = display.getOwnerUid();
        if (callingUid != displayOwnerUid) {
            throw new SecurityException(
                    "Only owner of the display can forward input events to it.");
        }

        return new InputForwarder(displayId);
    }

    // Native callback.
    private void notifyConfigurationChanged(long whenNanos) {
        mWindowManagerCallbacks.notifyConfigurationChanged();
    }

    // Native callback.
    private void notifyInputDevicesChanged(InputDevice[] inputDevices) {
        synchronized (mInputDevicesLock) {
            if (!mInputDevicesChangedPending) {
                mInputDevicesChangedPending = true;
                mHandler.obtainMessage(MSG_DELIVER_INPUT_DEVICES_CHANGED,
                        mInputDevices).sendToTarget();
            }

            mInputDevices = inputDevices;
        }
    }

    // Native callback.
    private void notifySwitch(long whenNanos, int switchValues, int switchMask) {
        if (DEBUG) {
            Slog.d(TAG, "notifySwitch: values=" + Integer.toHexString(switchValues)
                    + ", mask=" + Integer.toHexString(switchMask));
        }

        if ((switchMask & SW_LID_BIT) != 0) {
            final boolean lidOpen = ((switchValues & SW_LID_BIT) == 0);
            mWindowManagerCallbacks.notifyLidSwitchChanged(whenNanos, lidOpen);
        }

        if ((switchMask & SW_CAMERA_LENS_COVER_BIT) != 0) {
            final boolean lensCovered = ((switchValues & SW_CAMERA_LENS_COVER_BIT) != 0);
            mWindowManagerCallbacks.notifyCameraLensCoverSwitchChanged(whenNanos, lensCovered);
        }

        if (mUseDevInputEventForAudioJack && (switchMask & SW_JACK_BITS) != 0) {
            mWiredAccessoryCallbacks.notifyWiredAccessoryChanged(whenNanos, switchValues,
                    switchMask);
        }

        if ((switchMask & SW_TABLET_MODE_BIT) != 0) {
            SomeArgs args = SomeArgs.obtain();
            args.argi1 = (int) (whenNanos & 0xFFFFFFFF);
            args.argi2 = (int) (whenNanos >> 32);
            args.arg1 = Boolean.valueOf((switchValues & SW_TABLET_MODE_BIT) != 0);
            mHandler.obtainMessage(MSG_DELIVER_TABLET_MODE_CHANGED,
                    args).sendToTarget();
        }
    }

    // Native callback.
    private void notifyInputChannelBroken(IBinder token) {
        mWindowManagerCallbacks.notifyInputChannelBroken(token);
    }

    // Native callback
    private void notifyFocusChanged(IBinder token) {
        if (mFocusedWindow != token) {
            if (mFocusedWindowHasCapture) {
                setPointerCapture(false);
            }
            if (token instanceof IWindow) {
                mFocusedWindow = (IWindow) token;
            }
        }
    }

    // Native callback.
    private long notifyANR(IBinder token, String reason) {
        return mWindowManagerCallbacks.notifyANR(
                token, reason);
    }

    // Native callback.
    final boolean filterInputEvent(InputEvent event, int policyFlags) {
        synchronized (mInputFilterLock) {
            if (mInputFilter != null) {
                try {
                    mInputFilter.filterInputEvent(event, policyFlags);
                } catch (RemoteException e) {
                    /* ignore */
                }
                return false;
            }
        }
        event.recycle();
        return true;
    }

    // Native callback.
    private int interceptKeyBeforeQueueing(KeyEvent event, int policyFlags) {
        return mWindowManagerCallbacks.interceptKeyBeforeQueueing(event, policyFlags);
    }

    // Native callback.
    private int interceptMotionBeforeQueueingNonInteractive(long whenNanos, int policyFlags) {
        return mWindowManagerCallbacks.interceptMotionBeforeQueueingNonInteractive(
                whenNanos, policyFlags);
    }

    // Native callback.
    private long interceptKeyBeforeDispatching(IBinder focus, KeyEvent event, int policyFlags) {
        return mWindowManagerCallbacks.interceptKeyBeforeDispatching(focus, event, policyFlags);
    }

    // Native callback.
    private KeyEvent dispatchUnhandledKey(IBinder focus, KeyEvent event, int policyFlags) {
        return mWindowManagerCallbacks.dispatchUnhandledKey(focus, event, policyFlags);
    }

    // Native callback.
    private boolean checkInjectEventsPermission(int injectorPid, int injectorUid) {
        return mContext.checkPermission(android.Manifest.permission.INJECT_EVENTS,
                injectorPid, injectorUid) == PackageManager.PERMISSION_GRANTED;
    }

    // Native callback.
    private int getVirtualKeyQuietTimeMillis() {
        return mContext.getResources().getInteger(
                com.android.internal.R.integer.config_virtualKeyQuietTimeMillis);
    }

    // Native callback.
    private static String[] getExcludedDeviceNames() {
        List<String> names = new ArrayList<>();
        // Read partner-provided list of excluded input devices
        // Environment.getRootDirectory() is a fancy way of saying ANDROID_ROOT or "/system".
        final File[] baseDirs = {
            Environment.getRootDirectory(),
            Environment.getVendorDirectory()
        };
        for (File baseDir: baseDirs) {
            File confFile = new File(baseDir, EXCLUDED_DEVICES_PATH);
            try {
                InputStream stream = new FileInputStream(confFile);
                names.addAll(ConfigurationProcessor.processExcludedDeviceNames(stream));
            } catch (FileNotFoundException e) {
                // It's ok if the file does not exist.
            } catch (Exception e) {
                Slog.e(TAG, "Could not parse '" + confFile.getAbsolutePath() + "'", e);
            }
        }
        return names.toArray(new String[0]);
    }

    /**
     * Flatten a list of pairs into a list, with value positioned directly next to the key
     * @return Flattened list
     */
    private static <T> List<T> flatten(@NonNull List<Pair<T, T>> pairs) {
        List<T> list = new ArrayList<>(pairs.size() * 2);
        for (Pair<T, T> pair : pairs) {
            list.add(pair.first);
            list.add(pair.second);
        }
        return list;
    }

    /**
     * Ports are highly platform-specific, so only allow these to be specified in the vendor
     * directory.
     */
    // Native callback
    private static String[] getInputPortAssociations() {
        File baseDir = Environment.getVendorDirectory();
        File confFile = new File(baseDir, PORT_ASSOCIATIONS_PATH);

        try {
            InputStream stream = new FileInputStream(confFile);
            List<Pair<String, String>> associations =
                    ConfigurationProcessor.processInputPortAssociations(stream);
            List<String> associationList = flatten(associations);
            return associationList.toArray(new String[0]);
        } catch (FileNotFoundException e) {
            // Most of the time, file will not exist, which is expected.
        } catch (Exception e) {
            Slog.e(TAG, "Could not parse '" + confFile.getAbsolutePath() + "'", e);
        }
        return new String[0];
    }

    // Native callback.
    private int getKeyRepeatTimeout() {
        return ViewConfiguration.getKeyRepeatTimeout();
    }

    // Native callback.
    private int getKeyRepeatDelay() {
        return ViewConfiguration.getKeyRepeatDelay();
    }

    // Native callback.
    private int getHoverTapTimeout() {
        return ViewConfiguration.getHoverTapTimeout();
    }

    // Native callback.
    private int getHoverTapSlop() {
        return ViewConfiguration.getHoverTapSlop();
    }

    // Native callback.
    private int getDoubleTapTimeout() {
        return ViewConfiguration.getDoubleTapTimeout();
    }

    // Native callback.
    private int getLongPressTimeout() {
        return ViewConfiguration.getLongPressTimeout();
    }

    // Native callback.
    private int getPointerLayer() {
        return mWindowManagerCallbacks.getPointerLayer();
    }

    // Native callback.
    private PointerIcon getPointerIcon() {
        return PointerIcon.getDefaultIcon(mContext);
    }

    // Native callback.
    private String[] getKeyboardLayoutOverlay(InputDeviceIdentifier identifier) {
        if (!mSystemReady) {
            return null;
        }

        String keyboardLayoutDescriptor = getCurrentKeyboardLayoutForInputDevice(identifier);
        if (keyboardLayoutDescriptor == null) {
            return null;
        }

        final String[] result = new String[2];
        visitKeyboardLayout(keyboardLayoutDescriptor, new KeyboardLayoutVisitor() {
            @Override
            public void visitKeyboardLayout(Resources resources,
                    int keyboardLayoutResId, KeyboardLayout layout) {
                try {
                    result[0] = layout.getDescriptor();
                    result[1] = Streams.readFully(new InputStreamReader(
                            resources.openRawResource(keyboardLayoutResId)));
                } catch (IOException ex) {
                } catch (NotFoundException ex) {
                }
            }
        });
        if (result[0] == null) {
            Slog.w(TAG, "Could not get keyboard layout with descriptor '"
                    + keyboardLayoutDescriptor + "'.");
            return null;
        }
        return result;
    }

    // Native callback.
    private String getDeviceAlias(String uniqueId) {
        if (BluetoothAdapter.checkBluetoothAddress(uniqueId)) {
            // TODO(BT) mBluetoothService.getRemoteAlias(uniqueId)
            return null;
        }
        return null;
    }

    /**
     * Callback interface implemented by the Window Manager.
     */
    public interface WindowManagerCallbacks {
        public void notifyConfigurationChanged();

        public void notifyLidSwitchChanged(long whenNanos, boolean lidOpen);

        public void notifyCameraLensCoverSwitchChanged(long whenNanos, boolean lensCovered);

        public void notifyInputChannelBroken(IBinder token);

        public long notifyANR(IBinder token, String reason);

        public int interceptKeyBeforeQueueing(KeyEvent event, int policyFlags);

        public int interceptMotionBeforeQueueingNonInteractive(long whenNanos, int policyFlags);

        public long interceptKeyBeforeDispatching(IBinder token,
                KeyEvent event, int policyFlags);

        public KeyEvent dispatchUnhandledKey(IBinder token,
                KeyEvent event, int policyFlags);

        public int getPointerLayer();
    }

    /**
     * Callback interface implemented by WiredAccessoryObserver.
     */
    public interface WiredAccessoryCallbacks {
        public void notifyWiredAccessoryChanged(long whenNanos, int switchValues, int switchMask);
        public void systemReady();
    }

    /**
     * Private handler for the input manager.
     */
    private final class InputManagerHandler extends Handler {
        public InputManagerHandler(Looper looper) {
            super(looper, null, true /*async*/);
        }

        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case MSG_DELIVER_INPUT_DEVICES_CHANGED:
                    deliverInputDevicesChanged((InputDevice[])msg.obj);
                    break;
                case MSG_SWITCH_KEYBOARD_LAYOUT:
                    handleSwitchKeyboardLayout(msg.arg1, msg.arg2);
                    break;
                case MSG_RELOAD_KEYBOARD_LAYOUTS:
                    reloadKeyboardLayouts();
                    break;
                case MSG_UPDATE_KEYBOARD_LAYOUTS:
                    updateKeyboardLayouts();
                    break;
                case MSG_RELOAD_DEVICE_ALIASES:
                    reloadDeviceAliases();
                    break;
                case MSG_DELIVER_TABLET_MODE_CHANGED:
                    SomeArgs args = (SomeArgs) msg.obj;
                    long whenNanos = (args.argi1 & 0xFFFFFFFFl) | ((long) args.argi2 << 32);
                    boolean inTabletMode = (boolean) args.arg1;
                    deliverTabletModeChanged(whenNanos, inTabletMode);
                    break;
            }
        }
    }

    /**
     * Hosting interface for input filters to call back into the input manager.
     */
    private final class InputFilterHost extends IInputFilterHost.Stub {
        private boolean mDisconnected;

        public void disconnectLocked() {
            mDisconnected = true;
        }

        @Override
        public void sendInputEvent(InputEvent event, int policyFlags) {
            if (event == null) {
                throw new IllegalArgumentException("event must not be null");
            }

            synchronized (mInputFilterLock) {
                if (!mDisconnected) {
                    nativeInjectInputEvent(mPtr, event, 0, 0,
                            InputManager.INJECT_INPUT_EVENT_MODE_ASYNC, 0,
                            policyFlags | WindowManagerPolicy.FLAG_FILTERED);
                }
            }
        }
    }

    private static final class KeyboardLayoutDescriptor {
        public String packageName;
        public String receiverName;
        public String keyboardLayoutName;

        public static String format(String packageName,
                String receiverName, String keyboardName) {
            return packageName + "/" + receiverName + "/" + keyboardName;
        }

        public static KeyboardLayoutDescriptor parse(String descriptor) {
            int pos = descriptor.indexOf('/');
            if (pos < 0 || pos + 1 == descriptor.length()) {
                return null;
            }
            int pos2 = descriptor.indexOf('/', pos + 1);
            if (pos2 < pos + 2 || pos2 + 1 == descriptor.length()) {
                return null;
            }

            KeyboardLayoutDescriptor result = new KeyboardLayoutDescriptor();
            result.packageName = descriptor.substring(0, pos);
            result.receiverName = descriptor.substring(pos + 1, pos2);
            result.keyboardLayoutName = descriptor.substring(pos2 + 1);
            return result;
        }
    }

    private interface KeyboardLayoutVisitor {
        void visitKeyboardLayout(Resources resources,
                int keyboardLayoutResId, KeyboardLayout layout);
    }

    private final class InputDevicesChangedListenerRecord implements DeathRecipient {
        private final int mPid;
        private final IInputDevicesChangedListener mListener;

        public InputDevicesChangedListenerRecord(int pid, IInputDevicesChangedListener listener) {
            mPid = pid;
            mListener = listener;
        }

        @Override
        public void binderDied() {
            if (DEBUG) {
                Slog.d(TAG, "Input devices changed listener for pid " + mPid + " died.");
            }
            onInputDevicesChangedListenerDied(mPid);
        }

        public void notifyInputDevicesChanged(int[] info) {
            try {
                mListener.onInputDevicesChanged(info);
            } catch (RemoteException ex) {
                Slog.w(TAG, "Failed to notify process "
                        + mPid + " that input devices changed, assuming it died.", ex);
                binderDied();
            }
        }
    }

    private final class TabletModeChangedListenerRecord implements DeathRecipient {
        private final int mPid;
        private final ITabletModeChangedListener mListener;

        public TabletModeChangedListenerRecord(int pid, ITabletModeChangedListener listener) {
            mPid = pid;
            mListener = listener;
        }

        @Override
        public void binderDied() {
            if (DEBUG) {
                Slog.d(TAG, "Tablet mode changed listener for pid " + mPid + " died.");
            }
            onTabletModeChangedListenerDied(mPid);
        }

        public void notifyTabletModeChanged(long whenNanos, boolean inTabletMode) {
            try {
                mListener.onTabletModeChanged(whenNanos, inTabletMode);
            } catch (RemoteException ex) {
                Slog.w(TAG, "Failed to notify process " + mPid +
                        " that tablet mode changed, assuming it died.", ex);
                binderDied();
            }
        }
    }

    private final class VibratorToken implements DeathRecipient {
        public final int mDeviceId;
        public final IBinder mToken;
        public final int mTokenValue;

        public boolean mVibrating;

        public VibratorToken(int deviceId, IBinder token, int tokenValue) {
            mDeviceId = deviceId;
            mToken = token;
            mTokenValue = tokenValue;
        }

        @Override
        public void binderDied() {
            if (DEBUG) {
                Slog.d(TAG, "Vibrator token died.");
            }
            onVibratorTokenDied(this);
        }
    }

    private final class LocalService extends InputManagerInternal {
        @Override
        public void setDisplayViewports(List<DisplayViewport> viewports) {
            setDisplayViewportsInternal(viewports);
        }

        @Override
        public boolean injectInputEvent(InputEvent event, int mode) {
            return injectInputEventInternal(event, mode);
        }

        @Override
        public void setInteractive(boolean interactive) {
            nativeSetInteractive(mPtr, interactive);
        }

        @Override
        public void toggleCapsLock(int deviceId) {
            nativeToggleCapsLock(mPtr, deviceId);
        }

        @Override
        public void setPulseGestureEnabled(boolean enabled) {
            if (mDoubleTouchGestureEnableFile != null) {
                FileWriter writer = null;
                try {
                    writer = new FileWriter(mDoubleTouchGestureEnableFile);
                    writer.write(enabled ? "1" : "0");
                } catch (IOException e) {
                    Log.wtf(TAG, "Unable to setPulseGestureEnabled", e);
                } finally {
                    IoUtils.closeQuietly(writer);
                }
            }
        }
    }
}