Android 13 平板Taskbar加载流程

从 Android 12开始，如果是大屏底下导航栏会变成显示一个任务栏，从 NavigationBar 变成 Taskbar 。

注：CentralSurfacesImpl.java 与原来的 statusbar.java 的作用一样。

CentralSurfacesImpl 的启动流程前面有说过，这里不在说明。

// CentralSurfacesImpl.java
public class CentralSurfacesImpl extends CoreStartable implementsCentralSurfaces {//省略其他代码....protected void makeStatusBarView(@Nullable RegisterStatusBarResult result) {//省略其他代码....createNavigationBar(result);//省略其他代码....}protected void createNavigationBar(@Nullable RegisterStatusBarResult result) {// 调用 NavigationBarController 的 createNavigationBars()方法创建 NavigationBarmNavigationBarController.createNavigationBars(true /* includeDefaultDisplay */, result);}}

接着往下看：

NavigationBarController#createNavigationBars()// NavigationBarController.javapublic void createNavigationBars(final boolean includeDefaultDisplay,RegisterStatusBarResult result) {// 如果需要，更新辅助功能按钮模式updateAccessibilityButtonModeIfNeeded();// 这里是重点，Android 12 之前版本的，没有这个判断。可以看下 initializeTaskbarIfNecessary() 方法。// 如果我们初始化TaskBar，则不需要在默认显示上创建导航栏final boolean shouldCreateDefaultNavbar = includeDefaultDisplay&& !initializeTaskbarIfNecessary();Display[] displays = mDisplayManager.getDisplays();for (Display display : displays) {if (shouldCreateDefaultNavbar || display.getDisplayId() != DEFAULT_DISPLAY) {createNavigationBar(display, null /* savedState */, result);}}}/** @return {@code true} if taskbar is enabled, false otherwise */private boolean initializeTaskbarIfNecessary() {// 这里会判断是否是平板。// 跟踪代码发现，如果屏幕的（最小边长度*160/dpi值）< 600，就会判断为设备是平板设备// system/vendor/mediatek/proprietary/packages/apps/SystemUI/shared/src/com/android/systemui/shared/recents/utilities/Utilities.javaif (mIsTablet) {Trace.beginSection("NavigationBarController#initializeTaskbarIfNecessary");// 移除导航栏removeNavigationBar(mContext.getDisplayId());// 加载任务栏mTaskbarDelegate.init(mContext.getDisplayId());Trace.endSection();} else {mTaskbarDelegate.destroy();}return mIsTablet;}

我们分析平板，所以这里直接看 mTaskbarDelegate.init(mContext.getDisplayId()) 方法；

TaskbarDelegate#init()// TaskbarDelegate.javapublic void init(int displayId) {if (mInitialized) {return;}//省略其他代码....// 注册监听，切换导航模式时接收回调。mEdgeBackGestureHandler.onNavigationModeChanged(mNavigationModeController.addListener(this));// 边缘手势处理，注意：这里只加载、处理手势。// 手势中左右两返回图标由这里加载，底部黑色小横条不在这里加载。mEdgeBackGestureHandler.onNavBarAttached();//省略其他代码....}// 导航模式改变回调，进行处理@Overridepublic void onNavigationModeChanged(int mode) {mNavigationMode = mode;mEdgeBackGestureHandler.onNavigationModeChanged(mode);}

1、手势加载

EdgeBackGestureHandler#onNavBarAttached()// EdgeBackGestureHandler.java/*** @see NavigationBarView#onAttachedToWindow()*/public void onNavBarAttached() {mIsAttached = true;mProtoTracer.add(this);mOverviewProxyService.addCallback(mQuickSwitchListener);mSysUiState.addCallback(mSysUiStateCallback);// 重点关注这里，更新视图updateIsEnabled();startTracking();}private void updateIsEnabled() {// mIsAttached 是否已经添加上了，mIsGesturalModeEnabled 是否启用手势模式boolean isEnabled = mIsAttached && mIsGesturalModeEnabled;if (isEnabled == mIsEnabled) {return;}mIsEnabled = isEnabled;// 如果无效的话结束监听 InputdisposeInputChannel();if (mEdgeBackPlugin != null) {// 边缘导航栏销毁mEdgeBackPlugin.onDestroy();mEdgeBackPlugin = null;}// 是否启用手势模式if (!mIsEnabled) {// 注销监听返回手势参数的设置变化mGestureNavigationSettingsObserver.unregister();if (DEBUG_MISSING_GESTURE) {Log.d(DEBUG_MISSING_GESTURE_TAG, "Unregister display listener");}mPluginManager.removePluginListener(this);TaskStackChangeListeners.getInstance().unregisterTaskStackListener(mTaskStackListener);DeviceConfig.removeOnPropertiesChangedListener(mOnPropertiesChangedListener);try {// 注销 WMS 里保存的除外区域监听mWindowManagerService.unregisterSystemGestureExclusionListener(mGestureExclusionListener, mDisplayId);} catch (RemoteException | IllegalArgumentException e) {Log.e(TAG, "Failed to unregister window manager callbacks", e);}} else {// 监听返回手势参数的设置变化mGestureNavigationSettingsObserver.register();updateDisplaySize();if (DEBUG_MISSING_GESTURE) {Log.d(DEBUG_MISSING_GESTURE_TAG, "Register display listener");}TaskStackChangeListeners.getInstance().registerTaskStackListener(mTaskStackListener);DeviceConfig.addOnPropertiesChangedListener(DeviceConfig.NAMESPACE_SYSTEMUI,mMainExecutor::execute, mOnPropertiesChangedListener);try {// 监听 WMS 里保存的除外区域mWindowManagerService.registerSystemGestureExclusionListener(mGestureExclusionListener, mDisplayId);} catch (RemoteException | IllegalArgumentException e) {Log.e(TAG, "Failed to register window manager callbacks", e);}//  注册名为 edge-swipe 的InputMonitormInputMonitor = InputManager.getInstance().monitorGestureInput("edge-swipe", mDisplayId);mInputEventReceiver = new InputChannelCompat.InputEventReceiver(mInputMonitor.getInputChannel(), Looper.getMainLooper(),Choreographer.getInstance(), this::onInputEvent);// 添加 NavigationBarEdgePanel 为 Edge Back 事件的处理实现setEdgeBackPlugin(new NavigationBarEdgePanel(mContext, mBackAnimation, mLatencyTracker));mPluginManager.addPluginListener(this, NavigationEdgeBackPlugin.class, /*allowMultiple=*/ false);}// 更新 ML 模型资源.updateMLModelState();}// 创建返回手势视图private void setEdgeBackPlugin(NavigationEdgeBackPlugin edgeBackPlugin) {if (mEdgeBackPlugin != null) {mEdgeBackPlugin.onDestroy();}// 缓存 NavigationEdgeBackPlugin 实现mEdgeBackPlugin = edgeBackPlugin;// 向 NavigationEdgeBackPlugin 注册 Back 手势的触发回调mEdgeBackPlugin.setBackCallback(mBackCallback);// 准备好手势视图的 Window 参数mEdgeBackPlugin.setLayoutParams(createLayoutParams());updateDisplaySize();}// 配置返回手势 Window 的参数// 包括 flag、type、title 等属性private WindowManager.LayoutParams createLayoutParams() {Resources resources = mContext.getResources();WindowManager.LayoutParams layoutParams = new WindowManager.LayoutParams(resources.getDimensionPixelSize(R.dimen.navigation_edge_panel_width),resources.getDimensionPixelSize(R.dimen.navigation_edge_panel_height),WindowManager.LayoutParams.TYPE_NAVIGATION_BAR_PANEL,WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE| WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN,PixelFormat.TRANSLUCENT);...layoutParams.setTitle(TAG + mContext.getDisplayId());layoutParams.setFitInsetsTypes(0 /* types */);layoutParams.setTrustedOverlay();return layoutParams;}

到此手势导航创建完成，注意：此时 View 还是不可见的，后续事件产生的时候会进行展示和刷新。

下面粗略的看下手势相关的事件：

// EdgeBackGestureHandler.javaprivate void onMotionEvent(MotionEvent ev) {int action = ev.getActionMasked();if (action == MotionEvent.ACTION_DOWN) {mInputEventReceiver.setBatchingEnabled(false);mIsOnLeftEdge = ev.getX() <= mEdgeWidthLeft + mLeftInset;mMLResults = 0;mLogGesture = false;mInRejectedExclusion = false;boolean isWithinInsets = isWithinInsets((int) ev.getX(), (int) ev.getY());// 根据返回手势是否有效、// 点击区域是否是停用区域等条件// 得到当前是否允许视图处理该手势mAllowGesture = !mDisabledForQuickstep && mIsBackGestureAllowed && isWithinInsets&& !mGestureBlockingActivityRunning&& !QuickStepContract.isBackGestureDisabled(mSysUiFlags)&& isWithinTouchRegion((int) ev.getX(), (int) ev.getY());if (mAllowGesture) {// 更新当前是屏幕左侧还是右侧mEdgeBackPlugin.setIsLeftPanel(mIsOnLeftEdge);// 发射事件给视图mEdgeBackPlugin.onMotionEvent(ev);}} else if (mAllowGesture || mLogGesture) {if (!mThresholdCrossed) {mEndPoint.x = (int) ev.getX();mEndPoint.y = (int) ev.getY();// 多个手指按下的话取消事件处理if (action == MotionEvent.ACTION_POINTER_DOWN) {if (mAllowGesture) {logGesture(SysUiStatsLog.BACK_GESTURE__TYPE__INCOMPLETE_MULTI_TOUCH);cancelGesture(ev);}mLogGesture = false;return;} else if (action == MotionEvent.ACTION_MOVE) {// 手指移动超过长按阈值的话// 也要取消事件处理if ((ev.getEventTime() - ev.getDownTime()) > mLongPressTimeout) {if (mAllowGesture) {logGesture(SysUiStatsLog.BACK_GESTURE__TYPE__INCOMPLETE_LONG_PRESS);cancelGesture(ev);}mLogGesture = false;return;}...}}// 通过上述检查的话// 将 MOVE、UP 交给视图if (mAllowGesture) {// forward touchmEdgeBackPlugin.onMotionEvent(ev);}}mProtoTracer.scheduleFrameUpdate();}

事件间传递到 NavigationBarEdgePanel ，进行展示返回手势和触发返回。

NavigationBarEdgePanel 继续进行后面的工作：手势的判断、视图的刷新、动画的展示。

onMotionEvent() 的逻辑：

DOWN 的时候先让视图变为可见 VISIBLE
MOVE 的处理通过 handleMoveEvent() 判断距离，决定是否要更新赋予 mTriggerBack
UP 的时候将检查该变量决定是否触发返回动作即 triggerBack()

// NavigationBarEdgePanel.javapublic void onMotionEvent(MotionEvent event) {if (mVelocityTracker == null) {mVelocityTracker = VelocityTracker.obtain();}mVelocityTracker.addMovement(event);switch (event.getActionMasked()) {case MotionEvent.ACTION_DOWN:mDragSlopPassed = false;resetOnDown();mStartX = event.getX();mStartY = event.getY();setVisibility(VISIBLE);updatePosition(event.getY());mRegionSamplingHelper.start(mSamplingRect);mWindowManager.updateViewLayout(this, mLayoutParams);break;case MotionEvent.ACTION_MOVE:handleMoveEvent(event);break;case MotionEvent.ACTION_UP:if (mTriggerBack) {triggerBack();} else {cancelBack();}...}}

手势相关的事件流程到此打住了。

2、按钮导航
按钮导航是在 TouchInteractionService.java 中的 onCreate() 方法开始的。

// TouchInteractionService.java@Overridepublic void onCreate() {super.onCreate();//省略其他代码....mTaskbarManager = new TaskbarManager(this);//省略其他代码....}

用户配置完成后，根据配置，是否加载按钮导航。如果加载则会调用 TaskbarManager.java中的 recreateTaskbar() 方法。

TaskbarManager#recreateTaskbar()// TaskbarManager.javaprivate void recreateTaskbar() {// 销毁现有任务栏destroyExistingTaskbar();// 获取设备配置文件的DeviceProfile dp =mUserUnlocked ? LauncherAppState.getIDP(mContext).getDeviceProfile(mContext) : null;// 任务栏是否启用boolean isTaskBarEnabled = dp != null && dp.isTaskbarPresent;if(dp != null){Log.d("yexiao","yexiao"+(dp != null)+"----"+(dp.isTaskbarPresent));}if (!isTaskBarEnabled) {SystemUiProxy.INSTANCE.get(mContext).notifyTaskbarStatus(/* visible */ false, /* stashed */ false);return;}// TaskbarActivityContext 按钮导航的视图在里面加载，包括那个底部横线也在里面。mTaskbarActivityContext = new TaskbarActivityContext(mContext, dp, mNavButtonController,mUnfoldProgressProvider);// 初始化mTaskbarActivityContext.init(mSharedState);if (mActivity != null) {// 设置相关控制器mTaskbarActivityContext.setUIController(createTaskbarUIControllerForActivity(mActivity));}}

在 TaskbarManager 类中有个 mDispInfoChangeListener 的监听，当导航模式切换时，会在 DisplayController 类中去回调这里来。

接着往下看TaskbarActivityContext的构造方法：

public TaskbarActivityContext(Context windowContext, DeviceProfile dp,
TaskbarNavButtonController buttonController, ScopedUnfoldTransitionProgressProvider
unfoldTransitionProgressProvider) {
super(windowContext);
mDeviceProfile = dp.copy(this);

final Resources resources = getResources();mNavMode = DisplayController.getNavigationMode(windowContext);
mImeDrawsImeNavBar = getBoolByName(IME_DRAWS_IME_NAV_BAR_RES_NAME, resources, false);
mIsSafeModeEnabled = TraceHelper.allowIpcs("isSafeMode",() -> getPackageManager().isSafeMode());
mIsUserSetupComplete = SettingsCache.INSTANCE.get(this).getValue(Settings.Secure.getUriFor(Settings.Secure.USER_SETUP_COMPLETE), 0);
mIsNavBarForceVisible = SettingsCache.INSTANCE.get(this).getValue(Settings.Secure.getUriFor(Settings.Secure.NAV_BAR_KIDS_MODE), 0);
mIsNavBarKidsMode = SettingsCache.INSTANCE.get(this).getValue(Settings.Secure.getUriFor(Settings.Secure.NAV_BAR_KIDS_MODE), 0);updateIconSize(resources);// 首先获取显示和焦点，因为视图可能会在构造函数中使用它们。
Display display = windowContext.getDisplay();
Context c = display.getDisplayId() == Display.DEFAULT_DISPLAY? windowContext.getApplicationContext(): windowContext.getApplicationContext().createDisplayContext(display);
mWindowManager = c.getSystemService(WindowManager.class);
mLeftCorner = display.getRoundedCorner(RoundedCorner.POSITION_BOTTOM_LEFT);
mRightCorner = display.getRoundedCorner(RoundedCorner.POSITION_BOTTOM_RIGHT);// 初始化 views.
mDragLayer = (TaskbarDragLayer) mLayoutInflater.inflate(R.layout.taskbar, null, false);
TaskbarView taskbarView = mDragLayer.findViewById(R.id.taskbar_view);
TaskbarScrimView taskbarScrimView = mDragLayer.findViewById(R.id.taskbar_scrim);
FrameLayout navButtonsView = mDragLayer.findViewById(R.id.navbuttons_view);
StashedHandleView stashedHandleView = mDragLayer.findViewById(R.id.stashed_handle);mAccessibilityDelegate = new TaskbarShortcutMenuAccessibilityDelegate(this);// 构造控制器 controllers，将会在对应的控制添加对应的图标，以控制逻辑
mControllers = new TaskbarControllers(this,new TaskbarDragController(this),buttonController,getPackageManager().hasSystemFeature(FEATURE_PC)? new DesktopNavbarButtonsViewController(this, navButtonsView) :     new NavbarButtonsViewController(this, navButtonsView),new RotationButtonController(this,c.getColor(R.color.taskbar_nav_icon_light_color),c.getColor(R.color.taskbar_nav_icon_dark_color),R.drawable.ic_sysbar_rotate_button_ccw_start_0,R.drawable.ic_sysbar_rotate_button_ccw_start_90,R.drawable.ic_sysbar_rotate_button_cw_start_0,R.drawable.ic_sysbar_rotate_button_cw_start_90,() -> getDisplay().getRotation()),new TaskbarDragLayerController(this, mDragLayer),new TaskbarViewController(this, taskbarView),new TaskbarScrimViewController(this, taskbarScrimView),new TaskbarUnfoldAnimationController(this, unfoldTransitionProgressProvider,mWindowManager, WindowManagerGlobal.getWindowManagerService()),new TaskbarKeyguardController(this),new StashedHandleViewController(this, stashedHandleView),new TaskbarStashController(this),new TaskbarEduController(this),new TaskbarAutohideSuspendController(this),new TaskbarPopupController(this),new TaskbarForceVisibleImmersiveController(this),new TaskbarAllAppsController(this, dp),new TaskbarInsetsController(this));

}

public void init(@NonNull TaskbarSharedState sharedState) {
mLastRequestedNonFullscreenHeight = getDefaultTaskbarWindowHeight();
mWindowLayoutParams = createDefaultWindowLayoutParams();

//  在 TaskbarControllers控制器里，初始化前面构造方法中添加的各种控制器。
mControllers.init(sharedState);
updateSysuiStateFlags(sharedState.sysuiStateFlags, true /* fromInit */);
// 生成 LayoutParams 用于将视图作为新窗口直接添加到 WindowManager
mWindowManager.addView(mDragLayer, mWindowLayoutParams);

}

这里以 NavbarButtonsViewController 为例子分析：

// NavbarButtonsViewController.java/*** Initializes the controller*/public void init(TaskbarControllers controllers) {// 省略部分代码......// 强制导航按钮（特别是后退按钮）在设置向导期间可见。boolean isInSetup = !mContext.isUserSetupComplete();boolean isInKidsMode = mContext.isNavBarKidsModeActive();boolean alwaysShowButtons = isThreeButtonNav || isInSetup;// 省略部分代码......if (alwaysShowButtons) {// 初始化按钮initButtons(mNavButtonContainer, mEndContextualContainer,mControllers.navButtonController);} else {}// 省略部分代码......mSeparateWindowParent.recreateControllers();}private void initButtons(ViewGroup navContainer, ViewGroup endContainer,TaskbarNavButtonController navButtonController) {// back ButtonmBackButton = addButton(R.drawable.ic_sysbar_back, BUTTON_BACK,mNavButtonContainer, mControllers.navButtonController, R.id.back);mBackButtonAlpha = new MultiValueAlpha(mBackButton, NUM_ALPHA_CHANNELS);mBackButtonAlpha.setUpdateVisibility(true);mPropertyHolders.add(new StatePropertyHolder(mBackButtonAlpha.getProperty(ALPHA_INDEX_KEYGUARD_OR_DISABLE),flags -> {// Show only if not disabled, and if not on the keyguard or otherwise only when// the bouncer or a lockscreen app is showing above the keyguardboolean showingOnKeyguard = (flags & FLAG_KEYGUARD_VISIBLE) == 0 ||(flags & FLAG_ONLY_BACK_FOR_BOUNCER_VISIBLE) != 0 ||(flags & FLAG_KEYGUARD_OCCLUDED) != 0;return (flags & FLAG_DISABLE_BACK) == 0&& ((flags & FLAG_KEYGUARD_VISIBLE) == 0 || showingOnKeyguard);}));boolean isRtl = Utilities.isRtl(mContext.getResources());mPropertyHolders.add(new StatePropertyHolder(mBackButton,flags -> (flags & FLAG_IME_VISIBLE) != 0 && !mContext.isNavBarKidsModeActive(),View.ROTATION, isRtl ? 90 : -90, 0));// Translate back button to be at end/start of other buttons for keyguardint navButtonSize = mContext.getResources().getDimensionPixelSize(R.dimen.taskbar_nav_buttons_size);mPropertyHolders.add(new StatePropertyHolder(mBackButton, flags -> (flags & FLAG_ONLY_BACK_FOR_BOUNCER_VISIBLE) != 0|| (flags & FLAG_KEYGUARD_VISIBLE) != 0,VIEW_TRANSLATE_X, navButtonSize * (isRtl ? -2 : 2), 0));// home buttonmHomeButton = addButton(R.drawable.ic_sysbar_home, BUTTON_HOME, navContainer,navButtonController, R.id.home);mHomeButtonAlpha = new MultiValueAlpha(mHomeButton, NUM_ALPHA_CHANNELS);mHomeButtonAlpha.setUpdateVisibility(true);mPropertyHolders.add(new StatePropertyHolder(mHomeButtonAlpha.getProperty(ALPHA_INDEX_KEYGUARD_OR_DISABLE),flags -> (flags & FLAG_KEYGUARD_VISIBLE) == 0 &&(flags & FLAG_DISABLE_HOME) == 0));// Recents buttonView recentsButton = addButton(R.drawable.ic_sysbar_recent, BUTTON_RECENTS,navContainer, navButtonController, R.id.recent_apps);mHitboxExtender.init(recentsButton, mNavButtonsView, mContext.getDeviceProfile(),() -> {float[] recentsCoords = new float[2];getDescendantCoordRelativeToAncestor(recentsButton, mNavButtonsView,recentsCoords, false);return recentsCoords;}, new Handler());recentsButton.setOnClickListener(v -> {navButtonController.onButtonClick(BUTTON_RECENTS);mHitboxExtender.onRecentsButtonClicked();});mPropertyHolders.add(new StatePropertyHolder(recentsButton,flags -> (flags & FLAG_KEYGUARD_VISIBLE) == 0 && (flags & FLAG_DISABLE_RECENTS) == 0&& !mContext.isNavBarKidsModeActive()));// A11y buttonmA11yButton =  (R.drawable.ic_sysbar_accessibility_button, BUTTON_A11Y,endContainer, navButtonController, R.id.accessibility_button,R.layout.taskbar_contextual_button);mPropertyHolders.add(new StatePropertyHolder(mA11yButton,flags -> (flags & FLAG_A11Y_VISIBLE) != 0&& (flags & FLAG_ROTATION_BUTTON_VISIBLE) == 0));}

事件的在 addButton() 的时候直接设置了，而且有特殊需求的，会单独设置。

至此简单分析完成

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