core/java/com/android/internal/app/ResolverActivity.java

/*
 * Copyright (C) 2008 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.internal.app;

import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;

import android.annotation.Nullable;
import android.annotation.StringRes;
import android.annotation.UiThread;
import android.annotation.UnsupportedAppUsage;
import android.app.Activity;
import android.app.ActivityTaskManager;
import android.app.ActivityThread;
import android.app.VoiceInteractor.PickOptionRequest;
import android.app.VoiceInteractor.PickOptionRequest.Option;
import android.app.VoiceInteractor.Prompt;
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.pm.UserInfo;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.graphics.Insets;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.IBinder;
import android.os.PatternMatcher;
import android.os.RemoteException;
import android.os.StrictMode;
import android.os.UserHandle;
import android.os.UserManager;
import android.provider.MediaStore;
import android.provider.Settings;
import android.text.TextUtils;
import android.util.Log;
import android.util.Slog;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.WindowInsets;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.Space;
import android.widget.TextView;
import android.widget.Toast;

import com.android.internal.R;
import com.android.internal.annotations.VisibleForTesting;
import com.android.internal.app.chooser.DisplayResolveInfo;
import com.android.internal.app.chooser.TargetInfo;
import com.android.internal.content.PackageMonitor;
import com.android.internal.logging.MetricsLogger;
import com.android.internal.logging.nano.MetricsProto;
import com.android.internal.widget.ResolverDrawerLayout;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Objects;
import java.util.Set;

/**
 * This activity is displayed when the system attempts to start an Intent for
 * which there is more than one matching activity, allowing the user to decide
 * which to go to.  It is not normally used directly by application developers.
 */
@UiThread
public class ResolverActivity extends Activity implements
        ResolverListAdapter.ResolverListCommunicator {

    @UnsupportedAppUsage
    protected ResolverListAdapter mAdapter;
    private boolean mSafeForwardingMode;
    protected AbsListView mAdapterView;
    private Button mAlwaysButton;
    private Button mOnceButton;
    protected View mProfileView;
    private int mLastSelected = AbsListView.INVALID_POSITION;
    private boolean mResolvingHome = false;
    private int mProfileSwitchMessageId = -1;
    private int mLayoutId;
    @VisibleForTesting
    protected final ArrayList<Intent> mIntents = new ArrayList<>();
    private PickTargetOptionRequest mPickOptionRequest;
    private String mReferrerPackage;
    private CharSequence mTitle;
    private int mDefaultTitleResId;

    @VisibleForTesting
    protected boolean mUseLayoutForBrowsables;

    // Whether or not this activity supports choosing a default handler for the intent.
    @VisibleForTesting
    protected boolean mSupportsAlwaysUseOption;
    protected ResolverDrawerLayout mResolverDrawerLayout;
    @UnsupportedAppUsage
    protected PackageManager mPm;
    protected int mLaunchedFromUid;

    private static final String TAG = "ResolverActivity";
    private static final boolean DEBUG = false;

    private boolean mRegistered;

    protected Insets mSystemWindowInsets = null;
    private Space mFooterSpacer = null;

    /** See {@link #setRetainInOnStop}. */
    private boolean mRetainInOnStop;

    private static final String EXTRA_SHOW_FRAGMENT_ARGS = ":settings:show_fragment_args";
    private static final String EXTRA_FRAGMENT_ARG_KEY = ":settings:fragment_args_key";
    private static final String OPEN_LINKS_COMPONENT_KEY = "app_link_state";

    private final PackageMonitor mPackageMonitor = createPackageMonitor();

    /**
     * Get the string resource to be used as a label for the link to the resolver activity for an
     * action.
     *
     * @param action The action to resolve
     *
     * @return The string resource to be used as a label
     */
    public static @StringRes int getLabelRes(String action) {
        return ActionTitle.forAction(action).labelRes;
    }

    private enum ActionTitle {
        VIEW(Intent.ACTION_VIEW,
                com.android.internal.R.string.whichViewApplication,
                com.android.internal.R.string.whichViewApplicationNamed,
                com.android.internal.R.string.whichViewApplicationLabel),
        EDIT(Intent.ACTION_EDIT,
                com.android.internal.R.string.whichEditApplication,
                com.android.internal.R.string.whichEditApplicationNamed,
                com.android.internal.R.string.whichEditApplicationLabel),
        SEND(Intent.ACTION_SEND,
                com.android.internal.R.string.whichSendApplication,
                com.android.internal.R.string.whichSendApplicationNamed,
                com.android.internal.R.string.whichSendApplicationLabel),
        SENDTO(Intent.ACTION_SENDTO,
                com.android.internal.R.string.whichSendToApplication,
                com.android.internal.R.string.whichSendToApplicationNamed,
                com.android.internal.R.string.whichSendToApplicationLabel),
        SEND_MULTIPLE(Intent.ACTION_SEND_MULTIPLE,
                com.android.internal.R.string.whichSendApplication,
                com.android.internal.R.string.whichSendApplicationNamed,
                com.android.internal.R.string.whichSendApplicationLabel),
        CAPTURE_IMAGE(MediaStore.ACTION_IMAGE_CAPTURE,
                com.android.internal.R.string.whichImageCaptureApplication,
                com.android.internal.R.string.whichImageCaptureApplicationNamed,
                com.android.internal.R.string.whichImageCaptureApplicationLabel),
        DEFAULT(null,
                com.android.internal.R.string.whichApplication,
                com.android.internal.R.string.whichApplicationNamed,
                com.android.internal.R.string.whichApplicationLabel),
        HOME(Intent.ACTION_MAIN,
                com.android.internal.R.string.whichHomeApplication,
                com.android.internal.R.string.whichHomeApplicationNamed,
                com.android.internal.R.string.whichHomeApplicationLabel);

        // titles for layout that deals with http(s) intents
        public static final int BROWSABLE_TITLE_RES =
                com.android.internal.R.string.whichOpenLinksWith;
        public static final int BROWSABLE_HOST_TITLE_RES =
                com.android.internal.R.string.whichOpenHostLinksWith;
        public static final int BROWSABLE_HOST_APP_TITLE_RES =
                com.android.internal.R.string.whichOpenHostLinksWithApp;
        public static final int BROWSABLE_APP_TITLE_RES =
                com.android.internal.R.string.whichOpenLinksWithApp;

        public final String action;
        public final int titleRes;
        public final int namedTitleRes;
        public final @StringRes int labelRes;

        ActionTitle(String action, int titleRes, int namedTitleRes, @StringRes int labelRes) {
            this.action = action;
            this.titleRes = titleRes;
            this.namedTitleRes = namedTitleRes;
            this.labelRes = labelRes;
        }

        public static ActionTitle forAction(String action) {
            for (ActionTitle title : values()) {
                if (title != HOME && action != null && action.equals(title.action)) {
                    return title;
                }
            }
            return DEFAULT;
        }
    }

    protected PackageMonitor createPackageMonitor() {
        return new PackageMonitor() {
            @Override
            public void onSomePackagesChanged() {
                mAdapter.handlePackagesChanged();
                updateProfileViewButton();
            }

            @Override
            public boolean onPackageChanged(String packageName, int uid, String[] components) {
                // We care about all package changes, not just the whole package itself which is
                // default behavior.
                return true;
            }
        };
    }

    private Intent makeMyIntent() {
        Intent intent = new Intent(getIntent());
        intent.setComponent(null);
        // The resolver activity is set to be hidden from recent tasks.
        // we don't want this attribute to be propagated to the next activity
        // being launched.  Note that if the original Intent also had this
        // flag set, we are now losing it.  That should be a very rare case
        // and we can live with this.
        intent.setFlags(intent.getFlags()&~Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
        return intent;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // Use a specialized prompt when we're handling the 'Home' app startActivity()
        final Intent intent = makeMyIntent();
        final Set<String> categories = intent.getCategories();
        if (Intent.ACTION_MAIN.equals(intent.getAction())
                && categories != null
                && categories.size() == 1
                && categories.contains(Intent.CATEGORY_HOME)) {
            // Note: this field is not set to true in the compatibility version.
            mResolvingHome = true;
        }

        setSafeForwardingMode(true);

        onCreate(savedInstanceState, intent, null, 0, null, null, true);
    }

    /**
     * Compatibility version for other bundled services that use this overload without
     * a default title resource
     */
    @UnsupportedAppUsage
    protected void onCreate(Bundle savedInstanceState, Intent intent,
            CharSequence title, Intent[] initialIntents,
            List<ResolveInfo> rList, boolean supportsAlwaysUseOption) {
        onCreate(savedInstanceState, intent, title, 0, initialIntents, rList,
                supportsAlwaysUseOption);
    }

    protected void onCreate(Bundle savedInstanceState, Intent intent,
            CharSequence title, int defaultTitleRes, Intent[] initialIntents,
            List<ResolveInfo> rList, boolean supportsAlwaysUseOption) {
        setTheme(R.style.Theme_DeviceDefault_Resolver);
        super.onCreate(savedInstanceState);

        // Determine whether we should show that intent is forwarded
        // from managed profile to owner or other way around.
        setProfileSwitchMessageId(intent.getContentUserHint());

        try {
            mLaunchedFromUid = ActivityTaskManager.getService().getLaunchedFromUid(
                    getActivityToken());
        } catch (RemoteException e) {
            mLaunchedFromUid = -1;
        }

        if (mLaunchedFromUid < 0 || UserHandle.isIsolated(mLaunchedFromUid)) {
            // Gulp!
            finish();
            return;
        }

        mPm = getPackageManager();

        mPackageMonitor.register(this, getMainLooper(), false);
        mRegistered = true;
        mReferrerPackage = getReferrerPackageName();

        // Add our initial intent as the first item, regardless of what else has already been added.
        mIntents.add(0, new Intent(intent));
        mTitle = title;
        mDefaultTitleResId = defaultTitleRes;

        mUseLayoutForBrowsables = getTargetIntent() == null
                ? false
                : isHttpSchemeAndViewAction(getTargetIntent());

        mSupportsAlwaysUseOption = supportsAlwaysUseOption;

        // The last argument of createAdapter is whether to do special handling
        // of the last used choice to highlight it in the list.  We need to always
        // turn this off when running under voice interaction, since it results in
        // a more complicated UI that the current voice interaction flow is not able
        // to handle.
        boolean filterLastUsed = mSupportsAlwaysUseOption && !isVoiceInteraction();
        mAdapter = createAdapter(this, mIntents, initialIntents, rList,
                filterLastUsed, mUseLayoutForBrowsables);

        if (configureContentView()) {
            return;
        }

        final ResolverDrawerLayout rdl = findViewById(R.id.contentPanel);
        if (rdl != null) {
            rdl.setOnDismissedListener(new ResolverDrawerLayout.OnDismissedListener() {
                @Override
                public void onDismissed() {
                    finish();
                }
            });
            if (isVoiceInteraction()) {
                rdl.setCollapsed(false);
            }

            rdl.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                    | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
            rdl.setOnApplyWindowInsetsListener(this::onApplyWindowInsets);

            mResolverDrawerLayout = rdl;
        }

        mProfileView = findViewById(R.id.profile_button);
        if (mProfileView != null) {
            mProfileView.setOnClickListener(this::onProfileClick);
            updateProfileViewButton();
        }

        final Set<String> categories = intent.getCategories();
        MetricsLogger.action(this, mAdapter.hasFilteredItem()
                ? MetricsProto.MetricsEvent.ACTION_SHOW_APP_DISAMBIG_APP_FEATURED
                : MetricsProto.MetricsEvent.ACTION_SHOW_APP_DISAMBIG_NONE_FEATURED,
                intent.getAction() + ":" + intent.getType() + ":"
                        + (categories != null ? Arrays.toString(categories.toArray()) : ""));
    }

    protected void onProfileClick(View v) {
        final DisplayResolveInfo dri = mAdapter.getOtherProfile();
        if (dri == null) {
            return;
        }

        // Do not show the profile switch message anymore.
        mProfileSwitchMessageId = -1;

        onTargetSelected(dri, false);
        finish();
    }

    protected WindowInsets onApplyWindowInsets(View v, WindowInsets insets) {
        mSystemWindowInsets = insets.getSystemWindowInsets();

        mResolverDrawerLayout.setPadding(mSystemWindowInsets.left, mSystemWindowInsets.top,
                mSystemWindowInsets.right, 0);

        // Need extra padding so the list can fully scroll up
        if (useLayoutWithDefault()) {
            if (mFooterSpacer == null) {
                mFooterSpacer = new Space(getApplicationContext());
            } else {
                ((ListView) mAdapterView).removeFooterView(mFooterSpacer);
            }
            mFooterSpacer.setLayoutParams(new AbsListView.LayoutParams(LayoutParams.MATCH_PARENT,
                                                                       mSystemWindowInsets.bottom));
            ((ListView) mAdapterView).addFooterView(mFooterSpacer);
        } else {
            View emptyView = findViewById(R.id.empty);
            if (emptyView != null) {
                emptyView.setPadding(0, 0, 0, mSystemWindowInsets.bottom
                                     + getResources().getDimensionPixelSize(
                                             R.dimen.chooser_edge_margin_normal) * 2);
            }
        }

        resetButtonBar();

        return insets.consumeSystemWindowInsets();
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        mAdapter.handlePackagesChanged();

        if (mSystemWindowInsets != null) {
            mResolverDrawerLayout.setPadding(mSystemWindowInsets.left, mSystemWindowInsets.top,
                    mSystemWindowInsets.right, 0);
        }
    }

    @Override // ResolverListCommunicator
    public void sendVoiceChoicesIfNeeded() {
        if (!isVoiceInteraction()) {
            // Clearly not needed.
            return;
        }

        final Option[] options = new Option[mAdapter.getCount()];
        for (int i = 0, N = options.length; i < N; i++) {
            TargetInfo target = mAdapter.getItem(i);
            if (target == null) {
                // If this occurs, a new set of targets is being loaded. Let that complete,
                // and have the next call to send voice choices proceed instead.
                return;
            }
            options[i] = optionForChooserTarget(target, i);
        }

        mPickOptionRequest = new PickTargetOptionRequest(
                new Prompt(getTitle()), options, null);
        getVoiceInteractor().submitRequest(mPickOptionRequest);
    }

    Option optionForChooserTarget(TargetInfo target, int index) {
        return new Option(target.getDisplayLabel(), index);
    }

    protected final void setAdditionalTargets(Intent[] intents) {
        if (intents != null) {
            for (Intent intent : intents) {
                mIntents.add(intent);
            }
        }
    }

    @Override // SelectableTargetInfoCommunicator ResolverListCommunicator
    public Intent getTargetIntent() {
        return mIntents.isEmpty() ? null : mIntents.get(0);
    }

    protected String getReferrerPackageName() {
        final Uri referrer = getReferrer();
        if (referrer != null && "android-app".equals(referrer.getScheme())) {
            return referrer.getHost();
        }
        return null;
    }

    public int getLayoutResource() {
        return R.layout.resolver_list;
    }

    @Override // ResolverListCommunicator
    public void updateProfileViewButton() {
        if (mProfileView == null) {
            return;
        }

        final DisplayResolveInfo dri = mAdapter.getOtherProfile();
        if (dri != null) {
            mProfileView.setVisibility(View.VISIBLE);
            View text = mProfileView.findViewById(R.id.profile_button);
            if (!(text instanceof TextView)) {
                text = mProfileView.findViewById(R.id.text1);
            }
            ((TextView) text).setText(dri.getDisplayLabel());
        } else {
            mProfileView.setVisibility(View.GONE);
        }
    }

    private void setProfileSwitchMessageId(int contentUserHint) {
        if (contentUserHint != UserHandle.USER_CURRENT &&
                contentUserHint != UserHandle.myUserId()) {
            UserManager userManager = (UserManager) getSystemService(Context.USER_SERVICE);
            UserInfo originUserInfo = userManager.getUserInfo(contentUserHint);
            boolean originIsManaged = originUserInfo != null ? originUserInfo.isManagedProfile()
                    : false;
            boolean targetIsManaged = userManager.isManagedProfile();
            if (originIsManaged && !targetIsManaged) {
                mProfileSwitchMessageId = com.android.internal.R.string.forward_intent_to_owner;
            } else if (!originIsManaged && targetIsManaged) {
                mProfileSwitchMessageId = com.android.internal.R.string.forward_intent_to_work;
            }
        }
    }

    /**
     * Turn on launch mode that is safe to use when forwarding intents received from
     * applications and running in system processes.  This mode uses Activity.startActivityAsCaller
     * instead of the normal Activity.startActivity for launching the activity selected
     * by the user.
     *
     * <p>This mode is set to true by default if the activity is initialized through
     * {@link #onCreate(android.os.Bundle)}.  If a subclass calls one of the other onCreate
     * methods, it is set to false by default.  You must set it before calling one of the
     * more detailed onCreate methods, so that it will be set correctly in the case where
     * there is only one intent to resolve and it is thus started immediately.</p>
     */
    public void setSafeForwardingMode(boolean safeForwarding) {
        mSafeForwardingMode = safeForwarding;
    }

    protected CharSequence getTitleForAction(Intent intent, int defaultTitleRes) {
        final ActionTitle title = mResolvingHome
                ? ActionTitle.HOME
                : ActionTitle.forAction(intent.getAction());

        // While there may already be a filtered item, we can only use it in the title if the list
        // is already sorted and all information relevant to it is already in the list.
        final boolean named = mAdapter.getFilteredPosition() >= 0;
        if (title == ActionTitle.DEFAULT && defaultTitleRes != 0) {
            return getString(defaultTitleRes);
        } else if (isHttpSchemeAndViewAction(intent)) {
            // If the Intent's scheme is http(s) then we need to warn the user that
            // they're giving access for the activity to open URLs from this specific host
            String dialogTitle = null;
            if (named && !mUseLayoutForBrowsables) {
                dialogTitle = getString(ActionTitle.BROWSABLE_APP_TITLE_RES,
                        mAdapter.getFilteredItem().getDisplayLabel());
            } else if (named && mUseLayoutForBrowsables) {
                dialogTitle = getString(ActionTitle.BROWSABLE_HOST_APP_TITLE_RES,
                        intent.getData().getHost(),
                        mAdapter.getFilteredItem().getDisplayLabel());
            } else if (mAdapter.areAllTargetsBrowsers()) {
                dialogTitle = getString(ActionTitle.BROWSABLE_TITLE_RES);
            } else {
                dialogTitle = getString(ActionTitle.BROWSABLE_HOST_TITLE_RES,
                        intent.getData().getHost());
            }
            return dialogTitle;
        } else {
            return named
                    ? getString(title.namedTitleRes, mAdapter.getFilteredItem().getDisplayLabel())
                    : getString(title.titleRes);
        }
    }

    void dismiss() {
        if (!isFinishing()) {
            finish();
        }
    }

    @Override
    protected void onRestart() {
        super.onRestart();
        if (!mRegistered) {
            mPackageMonitor.register(this, getMainLooper(), false);
            mRegistered = true;
        }
        mAdapter.handlePackagesChanged();
        updateProfileViewButton();
    }

    @Override
    protected void onStop() {
        super.onStop();
        if (mRegistered) {
            mPackageMonitor.unregister();
            mRegistered = false;
        }
        final Intent intent = getIntent();
        if ((intent.getFlags() & FLAG_ACTIVITY_NEW_TASK) != 0 && !isVoiceInteraction()
                && !mResolvingHome && !mRetainInOnStop) {
            // This resolver is in the unusual situation where it has been
            // launched at the top of a new task.  We don't let it be added
            // to the recent tasks shown to the user, and we need to make sure
            // that each time we are launched we get the correct launching
            // uid (not re-using the same resolver from an old launching uid),
            // so we will now finish ourself since being no longer visible,
            // the user probably can't get back to us.
            if (!isChangingConfigurations()) {
                finish();
            }
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (!isChangingConfigurations() && mPickOptionRequest != null) {
            mPickOptionRequest.cancel();
        }
        if (mAdapter != null) {
            mAdapter.onDestroy();
        }
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        resetButtonBar();
    }

    private boolean isHttpSchemeAndViewAction(Intent intent) {
        return (IntentFilter.SCHEME_HTTP.equals(intent.getScheme())
                || IntentFilter.SCHEME_HTTPS.equals(intent.getScheme()))
                && Intent.ACTION_VIEW.equals(intent.getAction());
    }

    private boolean hasManagedProfile() {
        UserManager userManager = (UserManager) getSystemService(Context.USER_SERVICE);
        if (userManager == null) {
            return false;
        }

        try {
            List<UserInfo> profiles = userManager.getProfiles(getUserId());
            for (UserInfo userInfo : profiles) {
                if (userInfo != null && userInfo.isManagedProfile()) {
                    return true;
                }
            }
        } catch (SecurityException e) {
            return false;
        }
        return false;
    }

    private boolean supportsManagedProfiles(ResolveInfo resolveInfo) {
        try {
            ApplicationInfo appInfo = getPackageManager().getApplicationInfo(
                    resolveInfo.activityInfo.packageName, 0 /* default flags */);
            return appInfo.targetSdkVersion >= Build.VERSION_CODES.LOLLIPOP;
        } catch (NameNotFoundException e) {
            return false;
        }
    }

    private void setAlwaysButtonEnabled(boolean hasValidSelection, int checkedPos,
            boolean filtered) {
        boolean enabled = false;
        if (hasValidSelection) {
            ResolveInfo ri = mAdapter.resolveInfoForPosition(checkedPos, filtered);
            if (ri == null) {
                Log.e(TAG, "Invalid position supplied to setAlwaysButtonEnabled");
                return;
            } else if (ri.targetUserId != UserHandle.USER_CURRENT) {
                Log.e(TAG, "Attempted to set selection to resolve info for another user");
                return;
            } else {
                enabled = true;
            }
            if (mUseLayoutForBrowsables && !ri.handleAllWebDataURI) {
                mAlwaysButton.setText(getResources()
                        .getString(R.string.activity_resolver_set_always));
            } else {
                mAlwaysButton.setText(getResources()
                        .getString(R.string.activity_resolver_use_always));
            }
        }
        mAlwaysButton.setEnabled(enabled);
    }

    public void onButtonClick(View v) {
        final int id = v.getId();
        int which = mAdapter.hasFilteredItem()
                ? mAdapter.getFilteredPosition()
                : mAdapterView.getCheckedItemPosition();
        boolean hasIndexBeenFiltered = !mAdapter.hasFilteredItem();
        ResolveInfo ri = mAdapter.resolveInfoForPosition(which, hasIndexBeenFiltered);
        if (mUseLayoutForBrowsables
                && !ri.handleAllWebDataURI && id == R.id.button_always) {
            showSettingsForSelected(ri);
        } else {
            startSelected(which, id == R.id.button_always, hasIndexBeenFiltered);
        }
    }

    private void showSettingsForSelected(ResolveInfo ri) {
        Intent intent = new Intent();

        final String packageName = ri.activityInfo.packageName;
        Bundle showFragmentArgs = new Bundle();
        showFragmentArgs.putString(EXTRA_FRAGMENT_ARG_KEY, OPEN_LINKS_COMPONENT_KEY);
        showFragmentArgs.putString("package", packageName);

        // For regular apps, we open the Open by Default page
        intent.setAction(Settings.ACTION_APP_OPEN_BY_DEFAULT_SETTINGS)
                .setData(Uri.fromParts("package", packageName, null))
                .addFlags(Intent.FLAG_ACTIVITY_NEW_DOCUMENT)
                .putExtra(EXTRA_FRAGMENT_ARG_KEY, OPEN_LINKS_COMPONENT_KEY)
                .putExtra(EXTRA_SHOW_FRAGMENT_ARGS, showFragmentArgs);

        startActivity(intent);
    }

    public void startSelected(int which, boolean always, boolean hasIndexBeenFiltered) {
        if (isFinishing()) {
            return;
        }
        ResolveInfo ri = mAdapter.resolveInfoForPosition(which, hasIndexBeenFiltered);
        if (mResolvingHome && hasManagedProfile() && !supportsManagedProfiles(ri)) {
            Toast.makeText(this, String.format(getResources().getString(
                    com.android.internal.R.string.activity_resolver_work_profiles_support),
                    ri.activityInfo.loadLabel(getPackageManager()).toString()),
                    Toast.LENGTH_LONG).show();
            return;
        }

        TargetInfo target = mAdapter.targetInfoForPosition(which, hasIndexBeenFiltered);
        if (target == null) {
            return;
        }
        if (onTargetSelected(target, always)) {
            if (always && mSupportsAlwaysUseOption) {
                MetricsLogger.action(
                        this, MetricsProto.MetricsEvent.ACTION_APP_DISAMBIG_ALWAYS);
            } else if (mSupportsAlwaysUseOption) {
                MetricsLogger.action(
                        this, MetricsProto.MetricsEvent.ACTION_APP_DISAMBIG_JUST_ONCE);
            } else {
                MetricsLogger.action(
                        this, MetricsProto.MetricsEvent.ACTION_APP_DISAMBIG_TAP);
            }
            MetricsLogger.action(this, mAdapter.hasFilteredItem()
                            ? MetricsProto.MetricsEvent.ACTION_HIDE_APP_DISAMBIG_APP_FEATURED
                            : MetricsProto.MetricsEvent.ACTION_HIDE_APP_DISAMBIG_NONE_FEATURED);
            finish();
        }
    }

    /**
     * Replace me in subclasses!
     */
    @Override // ResolverListCommunicator
    public Intent getReplacementIntent(ActivityInfo aInfo, Intent defIntent) {
        return defIntent;
    }

    @Override // ResolverListCommunicator
    public void onPostListReady() {
        setHeader();
        resetButtonBar();
        onListRebuilt();
    }

    protected void onListRebuilt() {
        int count = mAdapter.getUnfilteredCount();
        if (count == 1 && mAdapter.getOtherProfile() == null) {
            // Only one target, so we're a candidate to auto-launch!
            final TargetInfo target = mAdapter.targetInfoForPosition(0, false);
            if (shouldAutoLaunchSingleChoice(target)) {
                safelyStartActivity(target);
                finish();
            }
        }
    }

    protected boolean onTargetSelected(TargetInfo target, boolean alwaysCheck) {
        final ResolveInfo ri = target.getResolveInfo();
        final Intent intent = target != null ? target.getResolvedIntent() : null;

        if (intent != null && (mSupportsAlwaysUseOption || mAdapter.hasFilteredItem())
                && mAdapter.mUnfilteredResolveList != null) {
            // Build a reasonable intent filter, based on what matched.
            IntentFilter filter = new IntentFilter();
            Intent filterIntent;

            if (intent.getSelector() != null) {
                filterIntent = intent.getSelector();
            } else {
                filterIntent = intent;
            }

            String action = filterIntent.getAction();
            if (action != null) {
                filter.addAction(action);
            }
            Set<String> categories = filterIntent.getCategories();
            if (categories != null) {
                for (String cat : categories) {
                    filter.addCategory(cat);
                }
            }
            filter.addCategory(Intent.CATEGORY_DEFAULT);

            int cat = ri.match & IntentFilter.MATCH_CATEGORY_MASK;
            Uri data = filterIntent.getData();
            if (cat == IntentFilter.MATCH_CATEGORY_TYPE) {
                String mimeType = filterIntent.resolveType(this);
                if (mimeType != null) {
                    try {
                        filter.addDataType(mimeType);
                    } catch (IntentFilter.MalformedMimeTypeException e) {
                        Log.w("ResolverActivity", e);
                        filter = null;
                    }
                }
            }
            if (data != null && data.getScheme() != null) {
                // We need the data specification if there was no type,
                // OR if the scheme is not one of our magical "file:"
                // or "content:" schemes (see IntentFilter for the reason).
                if (cat != IntentFilter.MATCH_CATEGORY_TYPE
                        || (!"file".equals(data.getScheme())
                                && !"content".equals(data.getScheme()))) {
                    filter.addDataScheme(data.getScheme());

                    // Look through the resolved filter to determine which part
                    // of it matched the original Intent.
                    Iterator<PatternMatcher> pIt = ri.filter.schemeSpecificPartsIterator();
                    if (pIt != null) {
                        String ssp = data.getSchemeSpecificPart();
                        while (ssp != null && pIt.hasNext()) {
                            PatternMatcher p = pIt.next();
                            if (p.match(ssp)) {
                                filter.addDataSchemeSpecificPart(p.getPath(), p.getType());
                                break;
                            }
                        }
                    }
                    Iterator<IntentFilter.AuthorityEntry> aIt = ri.filter.authoritiesIterator();
                    if (aIt != null) {
                        while (aIt.hasNext()) {
                            IntentFilter.AuthorityEntry a = aIt.next();
                            if (a.match(data) >= 0) {
                                int port = a.getPort();
                                filter.addDataAuthority(a.getHost(),
                                        port >= 0 ? Integer.toString(port) : null);
                                break;
                            }
                        }
                    }
                    pIt = ri.filter.pathsIterator();
                    if (pIt != null) {
                        String path = data.getPath();
                        while (path != null && pIt.hasNext()) {
                            PatternMatcher p = pIt.next();
                            if (p.match(path)) {
                                filter.addDataPath(p.getPath(), p.getType());
                                break;
                            }
                        }
                    }
                }
            }

            if (filter != null) {
                final int N = mAdapter.mUnfilteredResolveList.size();
                ComponentName[] set;
                // If we don't add back in the component for forwarding the intent to a managed
                // profile, the preferred activity may not be updated correctly (as the set of
                // components we tell it we knew about will have changed).
                final boolean needToAddBackProfileForwardingComponent =
                        mAdapter.getOtherProfile() != null;
                if (!needToAddBackProfileForwardingComponent) {
                    set = new ComponentName[N];
                } else {
                    set = new ComponentName[N + 1];
                }

                int bestMatch = 0;
                for (int i=0; i<N; i++) {
                    ResolveInfo r = mAdapter.mUnfilteredResolveList.get(i).getResolveInfoAt(0);
                    set[i] = new ComponentName(r.activityInfo.packageName,
                            r.activityInfo.name);
                    if (r.match > bestMatch) bestMatch = r.match;
                }

                if (needToAddBackProfileForwardingComponent) {
                    set[N] = mAdapter.getOtherProfile().getResolvedComponentName();
                    final int otherProfileMatch = mAdapter.getOtherProfile().getResolveInfo().match;
                    if (otherProfileMatch > bestMatch) bestMatch = otherProfileMatch;
                }

                if (alwaysCheck) {
                    final int userId = getUserId();
                    final PackageManager pm = getPackageManager();

                    // Set the preferred Activity
                    pm.addPreferredActivity(filter, bestMatch, set, intent.getComponent());

                    if (ri.handleAllWebDataURI) {
                        // Set default Browser if needed
                        final String packageName = pm.getDefaultBrowserPackageNameAsUser(userId);
                        if (TextUtils.isEmpty(packageName)) {
                            pm.setDefaultBrowserPackageNameAsUser(ri.activityInfo.packageName, userId);
                        }
                    } else {
                        // Update Domain Verification status
                        ComponentName cn = intent.getComponent();
                        String packageName = cn.getPackageName();
                        String dataScheme = (data != null) ? data.getScheme() : null;

                        boolean isHttpOrHttps = (dataScheme != null) &&
                                (dataScheme.equals(IntentFilter.SCHEME_HTTP) ||
                                        dataScheme.equals(IntentFilter.SCHEME_HTTPS));

                        boolean isViewAction = (action != null) && action.equals(Intent.ACTION_VIEW);
                        boolean hasCategoryBrowsable = (categories != null) &&
                                categories.contains(Intent.CATEGORY_BROWSABLE);

                        if (isHttpOrHttps && isViewAction && hasCategoryBrowsable) {
                            pm.updateIntentVerificationStatusAsUser(packageName,
                                    PackageManager.INTENT_FILTER_DOMAIN_VERIFICATION_STATUS_ALWAYS,
                                    userId);
                        }
                    }
                } else {
                    try {
                        mAdapter.mResolverListController.setLastChosen(intent, filter, bestMatch);
                    } catch (RemoteException re) {
                        Log.d(TAG, "Error calling setLastChosenActivity\n" + re);
                    }
                }
            }
        }

        if (target != null) {
            safelyStartActivity(target);

            // Rely on the ActivityManager to pop up a dialog regarding app suspension
            // and return false
            if (target.isSuspended()) {
                return false;
            }
        }

        return true;
    }

    public void safelyStartActivity(TargetInfo cti) {
        // We're dispatching intents that might be coming from legacy apps, so
        // don't kill ourselves.
        StrictMode.disableDeathOnFileUriExposure();
        try {
            safelyStartActivityInternal(cti);
        } finally {
            StrictMode.enableDeathOnFileUriExposure();
        }
    }

    private void safelyStartActivityInternal(TargetInfo cti) {
        // If needed, show that intent is forwarded
        // from managed profile to owner or other way around.
        if (mProfileSwitchMessageId != -1) {
            Toast.makeText(this, getString(mProfileSwitchMessageId), Toast.LENGTH_LONG).show();
        }
        if (!mSafeForwardingMode) {
            if (cti.start(this, null)) {
                onActivityStarted(cti);
            }
            return;
        }
        try {
            if (cti.startAsCaller(this, null, UserHandle.USER_NULL)) {
                onActivityStarted(cti);
            }
        } catch (RuntimeException e) {
            String launchedFromPackage;
            try {
                launchedFromPackage = ActivityTaskManager.getService().getLaunchedFromPackage(
                        getActivityToken());
            } catch (RemoteException e2) {
                launchedFromPackage = "??";
            }
            Slog.wtf(TAG, "Unable to launch as uid " + mLaunchedFromUid
                    + " package " + launchedFromPackage + ", while running in "
                    + ActivityThread.currentProcessName(), e);
        }
    }


    public boolean startAsCallerImpl(Intent intent, Bundle options, boolean ignoreTargetSecurity,
            int userId) {
        // Pass intent to delegate chooser activity with permission token.
        // TODO: This should move to a trampoline Activity in the system when the ChooserActivity
        // moves into systemui
        try {
            // TODO: Once this is a small springboard activity, it can move off the UI process
            // and we can move the request method to ActivityManagerInternal.
            IBinder permissionToken = ActivityTaskManager.getService()
                    .requestStartActivityPermissionToken(getActivityToken());
            final Intent chooserIntent = new Intent();
            final ComponentName delegateActivity = ComponentName.unflattenFromString(
                    Resources.getSystem().getString(R.string.config_chooserActivity));
            chooserIntent.setClassName(delegateActivity.getPackageName(),
                    delegateActivity.getClassName());
            chooserIntent.putExtra(ActivityTaskManager.EXTRA_PERMISSION_TOKEN, permissionToken);

            // TODO: These extras will change as chooser activity moves into systemui
            chooserIntent.putExtra(Intent.EXTRA_INTENT, intent);
            chooserIntent.putExtra(ActivityTaskManager.EXTRA_OPTIONS, options);
            chooserIntent.putExtra(ActivityTaskManager.EXTRA_IGNORE_TARGET_SECURITY,
                    ignoreTargetSecurity);
            chooserIntent.putExtra(Intent.EXTRA_USER_ID, userId);
            chooserIntent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT
                    | Intent.FLAG_ACTIVITY_PREVIOUS_IS_TOP);
            startActivity(chooserIntent);
        } catch (RemoteException e) {
            Log.e(TAG, e.toString());
        }
        return true;
    }

    public void onActivityStarted(TargetInfo cti) {
        // Do nothing
    }

    @Override // ResolverListCommunicator
    public boolean shouldGetActivityMetadata() {
        return false;
    }

    public boolean shouldAutoLaunchSingleChoice(TargetInfo target) {
        return !target.isSuspended();
    }

    public void showTargetDetails(ResolveInfo ri) {
        Intent in = new Intent().setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS)
                .setData(Uri.fromParts("package", ri.activityInfo.packageName, null))
                .addFlags(Intent.FLAG_ACTIVITY_NEW_DOCUMENT);
        startActivity(in);
    }

    public ResolverListAdapter createAdapter(Context context, List<Intent> payloadIntents,
            Intent[] initialIntents, List<ResolveInfo> rList,
            boolean filterLastUsed, boolean useLayoutForBrowsables) {
        return new ResolverListAdapter(context, payloadIntents, initialIntents, rList,
                filterLastUsed, createListController(), useLayoutForBrowsables, this);
    }

    @VisibleForTesting
    protected ResolverListController createListController() {
        return new ResolverListController(
                this,
                mPm,
                getTargetIntent(),
                getReferrerPackageName(),
                mLaunchedFromUid);
    }

    /**
     * Sets up the content view.
     * @return <code>true</code> if the activity is finishing and creation should halt.
     */
    private boolean configureContentView() {
        if (mAdapter == null) {
            throw new IllegalStateException("mAdapter cannot be null.");
        }
        boolean rebuildCompleted = mAdapter.rebuildList();
        if (useLayoutWithDefault()) {
            mLayoutId = R.layout.resolver_list_with_default;
        } else {
            mLayoutId = getLayoutResource();
        }
        setContentView(mLayoutId);
        mAdapterView = findViewById(R.id.resolver_list);
        return postRebuildList(rebuildCompleted);
    }

    /**
     * Finishing procedures to be performed after the list has been rebuilt.
     * </p>Subclasses must call postRebuildListInternal at the end of postRebuildList.
     * @param rebuildCompleted
     * @return <code>true</code> if the activity is finishing and creation should halt.
     */
    protected boolean postRebuildList(boolean rebuildCompleted) {
        return postRebuildListInternal(rebuildCompleted);
    }

    /**
     * Finishing procedures to be performed after the list has been rebuilt.
     * @param rebuildCompleted
     * @return <code>true</code> if the activity is finishing and creation should halt.
     */
    final boolean postRebuildListInternal(boolean rebuildCompleted) {

        int count = mAdapter.getUnfilteredCount();

        // We only rebuild asynchronously when we have multiple elements to sort. In the case where
        // we're already done, we can check if we should auto-launch immediately.
        if (rebuildCompleted) {
            if (count == 1 && mAdapter.getOtherProfile() == null) {
                // Only one target, so we're a candidate to auto-launch!
                final TargetInfo target = mAdapter.targetInfoForPosition(0, false);
                if (shouldAutoLaunchSingleChoice(target)) {
                    safelyStartActivity(target);
                    mPackageMonitor.unregister();
                    mRegistered = false;
                    finish();
                    return true;
                }
            }
        }

        if (count == 0 && mAdapter.getPlaceholderCount() == 0) {
            final TextView emptyView = findViewById(R.id.empty);
            emptyView.setVisibility(View.VISIBLE);
            mAdapterView.setVisibility(View.GONE);
        } else {
            mAdapterView.setVisibility(View.VISIBLE);
            onPrepareAdapterView(mAdapterView, mAdapter);
        }
        return false;
    }

    public void onPrepareAdapterView(AbsListView adapterView, ResolverListAdapter adapter) {
        final boolean useHeader = adapter.hasFilteredItem();
        final ListView listView = adapterView instanceof ListView ? (ListView) adapterView : null;

        adapterView.setAdapter(mAdapter);

        final ItemClickListener listener = new ItemClickListener();
        adapterView.setOnItemClickListener(listener);
        adapterView.setOnItemLongClickListener(listener);

        if (mSupportsAlwaysUseOption || mUseLayoutForBrowsables) {
            listView.setChoiceMode(AbsListView.CHOICE_MODE_SINGLE);
        }

        // In case this method is called again (due to activity recreation), avoid adding a new
        // header if one is already present.
        if (useHeader && listView != null && listView.getHeaderViewsCount() == 0) {
            listView.setHeaderDividersEnabled(true);
            listView.addHeaderView(LayoutInflater.from(this).inflate(
                    R.layout.resolver_different_item_header, listView, false));
        }
    }

    /**
     * Configure the area above the app selection list (title, content preview, etc).
     */
    public void setHeader() {
        if (mAdapter.getCount() == 0 && mAdapter.getPlaceholderCount() == 0) {
            final TextView titleView = findViewById(R.id.title);
            if (titleView != null) {
                titleView.setVisibility(View.GONE);
            }
        }

        CharSequence title = mTitle != null
                ? mTitle
                : getTitleForAction(getTargetIntent(), mDefaultTitleResId);

        if (!TextUtils.isEmpty(title)) {
            final TextView titleView = findViewById(R.id.title);
            if (titleView != null) {
                titleView.setText(title);
            }
            setTitle(title);
        }

        final ImageView iconView = findViewById(R.id.icon);
        if (iconView != null) {
            mAdapter.loadFilteredItemIconTaskAsync(iconView);
        }
    }

    private void resetButtonBar() {
        if (!mSupportsAlwaysUseOption && !mUseLayoutForBrowsables) {
            return;
        }
        final ViewGroup buttonLayout = findViewById(R.id.button_bar);
        if (buttonLayout != null) {
            buttonLayout.setVisibility(View.VISIBLE);

            if (!useLayoutWithDefault()) {
                int inset = mSystemWindowInsets != null ? mSystemWindowInsets.bottom : 0;
                buttonLayout.setPadding(buttonLayout.getPaddingLeft(), buttonLayout.getPaddingTop(),
                        buttonLayout.getPaddingRight(), getResources().getDimensionPixelSize(
                                R.dimen.resolver_button_bar_spacing) + inset);
            }
            mOnceButton = (Button) buttonLayout.findViewById(R.id.button_once);
            mAlwaysButton = (Button) buttonLayout.findViewById(R.id.button_always);

            resetAlwaysOrOnceButtonBar();
        } else {
            Log.e(TAG, "Layout unexpectedly does not have a button bar");
        }
    }

    private void resetAlwaysOrOnceButtonBar() {
        if (useLayoutWithDefault()
                && mAdapter.getFilteredPosition() != ListView.INVALID_POSITION) {
            setAlwaysButtonEnabled(true, mAdapter.getFilteredPosition(), false);
            mOnceButton.setEnabled(true);
            return;
        }

        // When the items load in, if an item was already selected, enable the buttons
        if (mAdapterView != null
                && mAdapterView.getCheckedItemPosition() != ListView.INVALID_POSITION) {
            setAlwaysButtonEnabled(true, mAdapterView.getCheckedItemPosition(), true);
            mOnceButton.setEnabled(true);
        }
    }

    @Override // ResolverListCommunicator
    public boolean useLayoutWithDefault() {
        return mSupportsAlwaysUseOption && mAdapter.hasFilteredItem();
    }

    /**
     * If {@code retainInOnStop} is set to true, we will not finish ourselves when onStop gets
     * called and we are launched in a new task.
     */
    protected void setRetainInOnStop(boolean retainInOnStop) {
        mRetainInOnStop = retainInOnStop;
    }

    /**
     * Check a simple match for the component of two ResolveInfos.
     */
    @Override // ResolverListCommunicator
    public boolean resolveInfoMatch(ResolveInfo lhs, ResolveInfo rhs) {
        return lhs == null ? rhs == null
                : lhs.activityInfo == null ? rhs.activityInfo == null
                : Objects.equals(lhs.activityInfo.name, rhs.activityInfo.name)
                && Objects.equals(lhs.activityInfo.packageName, rhs.activityInfo.packageName);
    }

    @Override // ResolverListCommunicator
    public void onHandlePackagesChanged() {
        if (mAdapter.getCount() == 0) {
            // We no longer have any items...  just finish the activity.
            finish();
        }
    }

    @VisibleForTesting
    public static final class ResolvedComponentInfo {
        public final ComponentName name;
        private final List<Intent> mIntents = new ArrayList<>();
        private final List<ResolveInfo> mResolveInfos = new ArrayList<>();

        public ResolvedComponentInfo(ComponentName name, Intent intent, ResolveInfo info) {
            this.name = name;
            add(intent, info);
        }

        public void add(Intent intent, ResolveInfo info) {
            mIntents.add(intent);
            mResolveInfos.add(info);
        }

        public int getCount() {
            return mIntents.size();
        }

        public Intent getIntentAt(int index) {
            return index >= 0 ? mIntents.get(index) : null;
        }

        public ResolveInfo getResolveInfoAt(int index) {
            return index >= 0 ? mResolveInfos.get(index) : null;
        }

        public int findIntent(Intent intent) {
            for (int i = 0, N = mIntents.size(); i < N; i++) {
                if (intent.equals(mIntents.get(i))) {
                    return i;
                }
            }
            return -1;
        }

        public int findResolveInfo(ResolveInfo info) {
            for (int i = 0, N = mResolveInfos.size(); i < N; i++) {
                if (info.equals(mResolveInfos.get(i))) {
                    return i;
                }
            }
            return -1;
        }
    }

    class ItemClickListener implements AdapterView.OnItemClickListener,
            AdapterView.OnItemLongClickListener {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            final ListView listView = parent instanceof ListView ? (ListView) parent : null;
            if (listView != null) {
                position -= listView.getHeaderViewsCount();
            }
            if (position < 0) {
                // Header views don't count.
                return;
            }
            // If we're still loading, we can't yet enable the buttons.
            if (mAdapter.resolveInfoForPosition(position, true) == null) {
                return;
            }

            final int checkedPos = mAdapterView.getCheckedItemPosition();
            final boolean hasValidSelection = checkedPos != ListView.INVALID_POSITION;
            if (!useLayoutWithDefault()
                    && (!hasValidSelection || mLastSelected != checkedPos)
                    && mAlwaysButton != null) {
                setAlwaysButtonEnabled(hasValidSelection, checkedPos, true);
                mOnceButton.setEnabled(hasValidSelection);
                if (hasValidSelection) {
                    mAdapterView.smoothScrollToPosition(checkedPos);
                }
                mLastSelected = checkedPos;
            } else {
                startSelected(position, false, true);
            }
        }

        @Override
        public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
            final ListView listView = parent instanceof ListView ? (ListView) parent : null;
            if (listView != null) {
                position -= listView.getHeaderViewsCount();
            }
            if (position < 0) {
                // Header views don't count.
                return false;
            }
            ResolveInfo ri = mAdapter.resolveInfoForPosition(position, true);
            showTargetDetails(ri);
            return true;
        }

    }

    static final boolean isSpecificUriMatch(int match) {
        match = match&IntentFilter.MATCH_CATEGORY_MASK;
        return match >= IntentFilter.MATCH_CATEGORY_HOST
                && match <= IntentFilter.MATCH_CATEGORY_PATH;
    }

    static class PickTargetOptionRequest extends PickOptionRequest {
        public PickTargetOptionRequest(@Nullable Prompt prompt, Option[] options,
                @Nullable Bundle extras) {
            super(prompt, options, extras);
        }

        @Override
        public void onCancel() {
            super.onCancel();
            final ResolverActivity ra = (ResolverActivity) getActivity();
            if (ra != null) {
                ra.mPickOptionRequest = null;
                ra.finish();
            }
        }

        @Override
        public void onPickOptionResult(boolean finished, Option[] selections, Bundle result) {
            super.onPickOptionResult(finished, selections, result);
            if (selections.length != 1) {
                // TODO In a better world we would filter the UI presented here and let the
                // user refine. Maybe later.
                return;
            }

            final ResolverActivity ra = (ResolverActivity) getActivity();
            if (ra != null) {
                final TargetInfo ti = ra.mAdapter.getItem(selections[0].getIndex());
                if (ra.onTargetSelected(ti, false)) {
                    ra.mPickOptionRequest = null;
                    ra.finish();
                }
            }
        }
    }
}