/* * Copyright (C) 2017 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.systemui.statusbar.phone; import static android.app.StatusBarManager.NAVIGATION_HINT_BACK_ALT; import static android.app.StatusBarManager.NAVIGATION_HINT_IME_SHOWN; import static android.app.StatusBarManager.WINDOW_STATE_SHOWING; import static android.app.StatusBarManager.windowStateToString; import static com.android.systemui.statusbar.phone.BarTransitions.MODE_SEMI_TRANSPARENT; import static com.android.systemui.statusbar.phone.StatusBar.DEBUG_WINDOW_STATE; import static com.android.systemui.statusbar.phone.StatusBar.dumpBarTransitions; import android.accessibilityservice.AccessibilityServiceInfo; import android.annotation.Nullable; import android.app.ActivityManager; import android.app.ActivityManagerNative; import android.app.Fragment; import android.app.IActivityManager; import android.app.StatusBarManager; import android.content.BroadcastReceiver; import android.content.ContentResolver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.res.Configuration; import android.database.ContentObserver; import android.graphics.PixelFormat; import android.graphics.Rect; import android.inputmethodservice.InputMethodService; import android.os.Binder; import android.os.Bundle; import android.os.Handler; import android.os.IBinder; import android.os.Message; import android.os.RemoteException; import android.os.UserHandle; import android.provider.Settings; import android.support.annotation.VisibleForTesting; import android.telecom.TelecomManager; import android.text.TextUtils; import android.util.Log; import android.view.IRotationWatcher.Stub; import android.view.KeyEvent; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.view.WindowManager; import android.view.WindowManager.LayoutParams; import android.view.WindowManagerGlobal; import android.view.accessibility.AccessibilityEvent; import android.view.accessibility.AccessibilityManager; import android.view.accessibility.AccessibilityManager.AccessibilityServicesStateChangeListener; import com.android.internal.logging.MetricsLogger; import com.android.internal.logging.nano.MetricsProto.MetricsEvent; import com.android.keyguard.LatencyTracker; import com.android.systemui.Dependency; import com.android.systemui.R; import com.android.systemui.SysUiServiceProvider; import com.android.systemui.assist.AssistManager; import com.android.systemui.fragments.FragmentHostManager; import com.android.systemui.fragments.FragmentHostManager.FragmentListener; import com.android.systemui.recents.Recents; import com.android.systemui.stackdivider.Divider; import com.android.systemui.statusbar.CommandQueue; import com.android.systemui.statusbar.CommandQueue.Callbacks; import com.android.systemui.statusbar.policy.AccessibilityManagerWrapper; import com.android.systemui.statusbar.policy.KeyButtonView; import com.android.systemui.statusbar.stack.StackStateAnimator; import java.io.FileDescriptor; import java.io.PrintWriter; import java.util.List; import java.util.Locale; /** * Fragment containing the NavigationBarFragment. Contains logic for what happens * on clicks and view states of the nav bar. */ public class NavigationBarFragment extends Fragment implements Callbacks { public static final String TAG = "NavigationBar"; private static final boolean DEBUG = false; private static final String EXTRA_DISABLE_STATE = "disabled_state"; /** Allow some time inbetween the long press for back and recents. */ private static final int LOCK_TO_APP_GESTURE_TOLERENCE = 200; protected NavigationBarView mNavigationBarView = null; protected AssistManager mAssistManager; private int mNavigationBarWindowState = WINDOW_STATE_SHOWING; private int mNavigationIconHints = 0; private int mNavigationBarMode; private AccessibilityManager mAccessibilityManager; private MagnificationContentObserver mMagnificationObserver; private ContentResolver mContentResolver; private int mDisabledFlags1; private StatusBar mStatusBar; private Recents mRecents; private Divider mDivider; private WindowManager mWindowManager; private CommandQueue mCommandQueue; private long mLastLockToAppLongPress; private Locale mLocale; private int mLayoutDirection; private int mSystemUiVisibility; private LightBarController mLightBarController; public boolean mHomeBlockedThisTouch; // ----- Fragment Lifecycle Callbacks ----- @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); mCommandQueue = SysUiServiceProvider.getComponent(getContext(), CommandQueue.class); mCommandQueue.addCallbacks(this); mStatusBar = SysUiServiceProvider.getComponent(getContext(), StatusBar.class); mRecents = SysUiServiceProvider.getComponent(getContext(), Recents.class); mDivider = SysUiServiceProvider.getComponent(getContext(), Divider.class); mWindowManager = getContext().getSystemService(WindowManager.class); mAccessibilityManager = getContext().getSystemService(AccessibilityManager.class); Dependency.get(AccessibilityManagerWrapper.class).addCallback( mAccessibilityListener); mContentResolver = getContext().getContentResolver(); mMagnificationObserver = new MagnificationContentObserver( getContext().getMainThreadHandler()); mContentResolver.registerContentObserver(Settings.Secure.getUriFor( Settings.Secure.ACCESSIBILITY_DISPLAY_MAGNIFICATION_NAVBAR_ENABLED), false, mMagnificationObserver, UserHandle.USER_ALL); if (savedInstanceState != null) { mDisabledFlags1 = savedInstanceState.getInt(EXTRA_DISABLE_STATE, 0); } mAssistManager = Dependency.get(AssistManager.class); try { WindowManagerGlobal.getWindowManagerService() .watchRotation(mRotationWatcher, getContext().getDisplay().getDisplayId()); } catch (RemoteException e) { throw e.rethrowFromSystemServer(); } } @Override public void onDestroy() { super.onDestroy(); mCommandQueue.removeCallbacks(this); Dependency.get(AccessibilityManagerWrapper.class).removeCallback( mAccessibilityListener); mContentResolver.unregisterContentObserver(mMagnificationObserver); try { WindowManagerGlobal.getWindowManagerService() .removeRotationWatcher(mRotationWatcher); } catch (RemoteException e) { throw e.rethrowFromSystemServer(); } } @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.navigation_bar, container, false); } @Override public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); mNavigationBarView = (NavigationBarView) view; mNavigationBarView.setDisabledFlags(mDisabledFlags1); mNavigationBarView.setComponents(mRecents, mDivider); mNavigationBarView.setOnVerticalChangedListener(this::onVerticalChanged); mNavigationBarView.setOnTouchListener(this::onNavigationTouch); if (savedInstanceState != null) { mNavigationBarView.getLightTransitionsController().restoreState(savedInstanceState); } prepareNavigationBarView(); checkNavBarModes(); IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_OFF); filter.addAction(Intent.ACTION_SCREEN_ON); getContext().registerReceiverAsUser(mBroadcastReceiver, UserHandle.ALL, filter, null, null); notifyNavigationBarScreenOn(); } @Override public void onDestroyView() { super.onDestroyView(); mNavigationBarView.getLightTransitionsController().destroy(getContext()); getContext().unregisterReceiver(mBroadcastReceiver); } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putInt(EXTRA_DISABLE_STATE, mDisabledFlags1); if (mNavigationBarView != null) { mNavigationBarView.getLightTransitionsController().saveState(outState); } } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); final Locale locale = getContext().getResources().getConfiguration().locale; final int ld = TextUtils.getLayoutDirectionFromLocale(locale); if (!locale.equals(mLocale) || ld != mLayoutDirection) { if (DEBUG) { Log.v(TAG, String.format( "config changed locale/LD: %s (%d) -> %s (%d)", mLocale, mLayoutDirection, locale, ld)); } mLocale = locale; mLayoutDirection = ld; refreshLayout(ld); } repositionNavigationBar(); } @Override public void dump(String prefix, FileDescriptor fd, PrintWriter pw, String[] args) { if (mNavigationBarView != null) { pw.print(" mNavigationBarWindowState="); pw.println(windowStateToString(mNavigationBarWindowState)); pw.print(" mNavigationBarMode="); pw.println(BarTransitions.modeToString(mNavigationBarMode)); dumpBarTransitions(pw, "mNavigationBarView", mNavigationBarView.getBarTransitions()); } pw.print(" mNavigationBarView="); if (mNavigationBarView == null) { pw.println("null"); } else { mNavigationBarView.dump(fd, pw, args); } } // ----- CommandQueue Callbacks ----- @Override public void setImeWindowStatus(IBinder token, int vis, int backDisposition, boolean showImeSwitcher) { boolean imeShown = (vis & InputMethodService.IME_VISIBLE) != 0; int hints = mNavigationIconHints; if ((backDisposition == InputMethodService.BACK_DISPOSITION_WILL_DISMISS) || imeShown) { hints |= NAVIGATION_HINT_BACK_ALT; } else { hints &= ~NAVIGATION_HINT_BACK_ALT; } if (showImeSwitcher) { hints |= NAVIGATION_HINT_IME_SHOWN; } else { hints &= ~NAVIGATION_HINT_IME_SHOWN; } if (hints == mNavigationIconHints) return; mNavigationIconHints = hints; if (mNavigationBarView != null) { mNavigationBarView.setNavigationIconHints(hints); } mStatusBar.checkBarModes(); } @Override public void topAppWindowChanged(boolean showMenu) { if (mNavigationBarView != null) { mNavigationBarView.setMenuVisibility(showMenu); } } @Override public void setWindowState(int window, int state) { if (mNavigationBarView != null && window == StatusBarManager.WINDOW_NAVIGATION_BAR && mNavigationBarWindowState != state) { mNavigationBarWindowState = state; if (DEBUG_WINDOW_STATE) Log.d(TAG, "Navigation bar " + windowStateToString(state)); } } // Injected from StatusBar at creation. public void setCurrentSysuiVisibility(int systemUiVisibility) { mSystemUiVisibility = systemUiVisibility; mNavigationBarMode = mStatusBar.computeBarMode(0, mSystemUiVisibility, View.NAVIGATION_BAR_TRANSIENT, View.NAVIGATION_BAR_TRANSLUCENT, View.NAVIGATION_BAR_TRANSPARENT); checkNavBarModes(); mStatusBar.touchAutoHide(); mLightBarController.onNavigationVisibilityChanged(mSystemUiVisibility, 0 /* mask */, true /* nbModeChanged */, mNavigationBarMode); } @Override public void setSystemUiVisibility(int vis, int fullscreenStackVis, int dockedStackVis, int mask, Rect fullscreenStackBounds, Rect dockedStackBounds) { final int oldVal = mSystemUiVisibility; final int newVal = (oldVal & ~mask) | (vis & mask); final int diff = newVal ^ oldVal; boolean nbModeChanged = false; if (diff != 0) { mSystemUiVisibility = newVal; // update navigation bar mode final int nbMode = getView() == null ? -1 : mStatusBar.computeBarMode(oldVal, newVal, View.NAVIGATION_BAR_TRANSIENT, View.NAVIGATION_BAR_TRANSLUCENT, View.NAVIGATION_BAR_TRANSPARENT); nbModeChanged = nbMode != -1; if (nbModeChanged) { if (mNavigationBarMode != nbMode) { mNavigationBarMode = nbMode; checkNavBarModes(); } mStatusBar.touchAutoHide(); } } mLightBarController.onNavigationVisibilityChanged(vis, mask, nbModeChanged, mNavigationBarMode); } @Override public void disable(int state1, int state2, boolean animate) { // All navigation bar flags are in state1. int masked = state1 & (StatusBarManager.DISABLE_HOME | StatusBarManager.DISABLE_RECENT | StatusBarManager.DISABLE_BACK | StatusBarManager.DISABLE_SEARCH); if (masked != mDisabledFlags1) { mDisabledFlags1 = masked; if (mNavigationBarView != null) mNavigationBarView.setDisabledFlags(state1); } } // ----- Internal stuffz ----- private void refreshLayout(int layoutDirection) { if (mNavigationBarView != null) { mNavigationBarView.setLayoutDirection(layoutDirection); } } private boolean shouldDisableNavbarGestures() { return !mStatusBar.isDeviceProvisioned() || (mDisabledFlags1 & StatusBarManager.DISABLE_SEARCH) != 0; } private void repositionNavigationBar() { if (mNavigationBarView == null || !mNavigationBarView.isAttachedToWindow()) return; prepareNavigationBarView(); mWindowManager.updateViewLayout((View) mNavigationBarView.getParent(), ((View) mNavigationBarView.getParent()).getLayoutParams()); } private void notifyNavigationBarScreenOn() { mNavigationBarView.notifyScreenOn(); } private void prepareNavigationBarView() { mNavigationBarView.reorient(); ButtonDispatcher recentsButton = mNavigationBarView.getRecentsButton(); recentsButton.setOnClickListener(this::onRecentsClick); recentsButton.setOnTouchListener(this::onRecentsTouch); recentsButton.setLongClickable(true); recentsButton.setOnLongClickListener(this::onLongPressBackRecents); ButtonDispatcher backButton = mNavigationBarView.getBackButton(); backButton.setLongClickable(true); backButton.setOnLongClickListener(this::onLongPressBackRecents); ButtonDispatcher homeButton = mNavigationBarView.getHomeButton(); homeButton.setOnTouchListener(this::onHomeTouch); homeButton.setOnLongClickListener(this::onHomeLongClick); ButtonDispatcher accessibilityButton = mNavigationBarView.getAccessibilityButton(); accessibilityButton.setOnClickListener(this::onAccessibilityClick); accessibilityButton.setOnLongClickListener(this::onAccessibilityLongClick); updateAccessibilityServicesState(mAccessibilityManager); } private boolean onHomeTouch(View v, MotionEvent event) { if (mHomeBlockedThisTouch && event.getActionMasked() != MotionEvent.ACTION_DOWN) { return true; } // If an incoming call is ringing, HOME is totally disabled. // (The user is already on the InCallUI at this point, // and his ONLY options are to answer or reject the call.) switch (event.getAction()) { case MotionEvent.ACTION_DOWN: mHomeBlockedThisTouch = false; TelecomManager telecomManager = getContext().getSystemService(TelecomManager.class); if (telecomManager != null && telecomManager.isRinging()) { if (mStatusBar.isKeyguardShowing()) { Log.i(TAG, "Ignoring HOME; there's a ringing incoming call. " + "No heads up"); mHomeBlockedThisTouch = true; return true; } } break; case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: mStatusBar.awakenDreams(); break; } return false; } private void onVerticalChanged(boolean isVertical) { mStatusBar.setQsScrimEnabled(!isVertical); } private boolean onNavigationTouch(View v, MotionEvent event) { mStatusBar.checkUserAutohide(v, event); return false; } @VisibleForTesting boolean onHomeLongClick(View v) { if (shouldDisableNavbarGestures()) { return false; } MetricsLogger.action(getContext(), MetricsEvent.ACTION_ASSIST_LONG_PRESS); mAssistManager.startAssist(new Bundle() /* args */); mStatusBar.awakenDreams(); if (mNavigationBarView != null) { mNavigationBarView.abortCurrentGesture(); } return true; } // additional optimization when we have software system buttons - start loading the recent // tasks on touch down private boolean onRecentsTouch(View v, MotionEvent event) { int action = event.getAction() & MotionEvent.ACTION_MASK; if (action == MotionEvent.ACTION_DOWN) { mCommandQueue.preloadRecentApps(); } else if (action == MotionEvent.ACTION_CANCEL) { mCommandQueue.cancelPreloadRecentApps(); } else if (action == MotionEvent.ACTION_UP) { if (!v.isPressed()) { mCommandQueue.cancelPreloadRecentApps(); } } return false; } private void onRecentsClick(View v) { if (LatencyTracker.isEnabled(getContext())) { LatencyTracker.getInstance(getContext()).onActionStart( LatencyTracker.ACTION_TOGGLE_RECENTS); } mStatusBar.awakenDreams(); mCommandQueue.toggleRecentApps(); } /** * This handles long-press of both back and recents. They are * handled together to capture them both being long-pressed * at the same time to exit screen pinning (lock task). * * When accessibility mode is on, only a long-press from recents * is required to exit. * * In all other circumstances we try to pass through long-press events * for Back, so that apps can still use it. Which can be from two things. * 1) Not currently in screen pinning (lock task). * 2) Back is long-pressed without recents. */ private boolean onLongPressBackRecents(View v) { try { boolean sendBackLongPress = false; IActivityManager activityManager = ActivityManagerNative.getDefault(); boolean touchExplorationEnabled = mAccessibilityManager.isTouchExplorationEnabled(); boolean inLockTaskMode = activityManager.isInLockTaskMode(); if (inLockTaskMode && !touchExplorationEnabled) { long time = System.currentTimeMillis(); // If we recently long-pressed the other button then they were // long-pressed 'together' if ((time - mLastLockToAppLongPress) < LOCK_TO_APP_GESTURE_TOLERENCE) { activityManager.stopLockTaskMode(); // When exiting refresh disabled flags. mNavigationBarView.setDisabledFlags(mDisabledFlags1, true); return true; } else if ((v.getId() == R.id.back) && !mNavigationBarView.getRecentsButton().getCurrentView().isPressed()) { // If we aren't pressing recents right now then they presses // won't be together, so send the standard long-press action. sendBackLongPress = true; } mLastLockToAppLongPress = time; } else { // If this is back still need to handle sending the long-press event. if (v.getId() == R.id.back) { sendBackLongPress = true; } else if (touchExplorationEnabled && inLockTaskMode) { // When in accessibility mode a long press that is recents (not back) // should stop lock task. activityManager.stopLockTaskMode(); // When exiting refresh disabled flags. mNavigationBarView.setDisabledFlags(mDisabledFlags1, true); return true; } else if (v.getId() == R.id.recent_apps) { return onLongPressRecents(); } } if (sendBackLongPress) { KeyButtonView keyButtonView = (KeyButtonView) v; keyButtonView.sendEvent(KeyEvent.ACTION_DOWN, KeyEvent.FLAG_LONG_PRESS); keyButtonView.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); return true; } } catch (RemoteException e) { Log.d(TAG, "Unable to reach activity manager", e); } return false; } private boolean onLongPressRecents() { if (mRecents == null || !ActivityManager.supportsMultiWindow(getContext()) || !mDivider.getView().getSnapAlgorithm().isSplitScreenFeasible() || Recents.getConfiguration().isLowRamDevice) { return false; } return mStatusBar.toggleSplitScreenMode(MetricsEvent.ACTION_WINDOW_DOCK_LONGPRESS, MetricsEvent.ACTION_WINDOW_UNDOCK_LONGPRESS); } private void onAccessibilityClick(View v) { mAccessibilityManager.notifyAccessibilityButtonClicked(); } private boolean onAccessibilityLongClick(View v) { Intent intent = new Intent(AccessibilityManager.ACTION_CHOOSE_ACCESSIBILITY_BUTTON); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK); v.getContext().startActivityAsUser(intent, UserHandle.CURRENT); return true; } private void updateAccessibilityServicesState(AccessibilityManager accessibilityManager) { int requestingServices = 0; try { if (Settings.Secure.getIntForUser(mContentResolver, Settings.Secure.ACCESSIBILITY_DISPLAY_MAGNIFICATION_NAVBAR_ENABLED, UserHandle.USER_CURRENT) == 1) { requestingServices++; } } catch (Settings.SettingNotFoundException e) { } // AccessibilityManagerService resolves services for the current user since the local // AccessibilityManager is created from a Context with the INTERACT_ACROSS_USERS permission final List services = accessibilityManager.getEnabledAccessibilityServiceList( AccessibilityServiceInfo.FEEDBACK_ALL_MASK); for (int i = services.size() - 1; i >= 0; --i) { AccessibilityServiceInfo info = services.get(i); if ((info.flags & AccessibilityServiceInfo.FLAG_REQUEST_ACCESSIBILITY_BUTTON) != 0) { requestingServices++; } } final boolean showAccessibilityButton = requestingServices >= 1; final boolean targetSelection = requestingServices >= 2; mNavigationBarView.setAccessibilityButtonState(showAccessibilityButton, targetSelection); } // ----- Methods that StatusBar talks to (should be minimized) ----- public void setLightBarController(LightBarController lightBarController) { mLightBarController = lightBarController; mLightBarController.setNavigationBar(mNavigationBarView.getLightTransitionsController()); } public boolean isSemiTransparent() { return mNavigationBarMode == MODE_SEMI_TRANSPARENT; } public void disableAnimationsDuringHide(long delay) { mNavigationBarView.setLayoutTransitionsEnabled(false); mNavigationBarView.postDelayed(() -> mNavigationBarView.setLayoutTransitionsEnabled(true), delay + StackStateAnimator.ANIMATION_DURATION_GO_TO_FULL_SHADE); } public BarTransitions getBarTransitions() { return mNavigationBarView.getBarTransitions(); } public void checkNavBarModes() { mStatusBar.checkBarMode(mNavigationBarMode, mNavigationBarWindowState, mNavigationBarView.getBarTransitions()); } public void finishBarAnimations() { mNavigationBarView.getBarTransitions().finishAnimations(); } private final AccessibilityServicesStateChangeListener mAccessibilityListener = this::updateAccessibilityServicesState; private class MagnificationContentObserver extends ContentObserver { public MagnificationContentObserver(Handler handler) { super(handler); } @Override public void onChange(boolean selfChange) { NavigationBarFragment.this.updateAccessibilityServicesState(mAccessibilityManager); } } private final Stub mRotationWatcher = new Stub() { @Override public void onRotationChanged(int rotation) throws RemoteException { // We need this to be scheduled as early as possible to beat the redrawing of // window in response to the orientation change. Handler h = getView().getHandler(); Message msg = Message.obtain(h, () -> { if (mNavigationBarView != null && mNavigationBarView.needsReorient(rotation)) { repositionNavigationBar(); } }); msg.setAsynchronous(true); h.sendMessageAtFrontOfQueue(msg); } }; private final BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { String action = intent.getAction(); if (Intent.ACTION_SCREEN_OFF.equals(action) || Intent.ACTION_SCREEN_ON.equals(action)) { notifyNavigationBarScreenOn(); } } }; public static View create(Context context, FragmentListener listener) { WindowManager.LayoutParams lp = new WindowManager.LayoutParams( LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.TYPE_NAVIGATION_BAR, WindowManager.LayoutParams.FLAG_TOUCHABLE_WHEN_WAKING | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH | WindowManager.LayoutParams.FLAG_SPLIT_TOUCH | WindowManager.LayoutParams.FLAG_SLIPPERY, PixelFormat.TRANSLUCENT); lp.token = new Binder(); lp.setTitle("NavigationBar"); lp.windowAnimations = 0; View navigationBarView = LayoutInflater.from(context).inflate( R.layout.navigation_bar_window, null); if (DEBUG) Log.v(TAG, "addNavigationBar: about to add " + navigationBarView); if (navigationBarView == null) return null; context.getSystemService(WindowManager.class).addView(navigationBarView, lp); FragmentHostManager fragmentHost = FragmentHostManager.get(navigationBarView); NavigationBarFragment fragment = new NavigationBarFragment(); fragmentHost.getFragmentManager().beginTransaction() .replace(R.id.navigation_bar_frame, fragment, TAG) .commit(); fragmentHost.addTagListener(TAG, listener); return navigationBarView; } }