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Android12对最近任务做了调整#xff0c;将原本处于SystemUI模块的最近任务转移到了Launcher3QuickStep应用中。 本篇文章我们会结合源码一起来梳理一下最近任务的显示流程。
一、SystemUI模块显示最近任务的相关代码
1、在SystemUI模块调用CommandQueue的showRecentA…前言
Android12对最近任务做了调整将原本处于SystemUI模块的最近任务转移到了Launcher3QuickStep应用中。 本篇文章我们会结合源码一起来梳理一下最近任务的显示流程。
一、SystemUI模块显示最近任务的相关代码
1、在SystemUI模块调用CommandQueue的showRecentApps方法可以实现最近任务的显示。 frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/CommandQueue.java public class CommandQueue extends IStatusBar.Stub implementsCallbackControllerCallbacks,DisplayManager.DisplayListener {private Handler mHandler new H(Looper.getMainLooper());public void showRecentApps(boolean triggeredFromAltTab) {synchronized (mLock) {mHandler.removeMessages(MSG_SHOW_RECENT_APPS);mHandler.obtainMessage(MSG_SHOW_RECENT_APPS, triggeredFromAltTab ? 1 : 0, 0,null).sendToTarget();}}}showRecentApps方法会调用Handler发送类型为MSG_SHOW_RECENT_APPS的消息。
2、Handler对象在接收到MSG_SHOW_RECENT_APPS消息之后会调用所有回调对象的showRecentApps方法。
public class CommandQueue extends IStatusBar.Stub implementsCallbackControllerCallbacks,DisplayManager.DisplayListener {private static final int MSG_SHOW_RECENT_APPS 13 MSG_SHIFT;//显示最近任务private ArrayListCallbacks mCallbacks new ArrayList();//回调对象集合private final class H extends Handler {private H(Looper l) {super(l);}public void handleMessage(Message msg) {final int what msg.what MSG_MASK;switch (what) {case MSG_SHOW_RECENT_APPS:for (int i 0; i mCallbacks.size(); i) {//调用左右回调对象的showRecentApps方法mCallbacks.get(i).showRecentApps(msg.arg1 ! 0);}break;}}}public interface Callbacks {default void showRecentApps(boolean triggeredFromAltTab) {}}}3、类型为Recents的SystemUI组件实现了CommandQueue.Callbacks接口并将自身添加到了CommandQueue的监听回调对象集合中 这样CommandQueue的showRecentApps方法会触发Recents组件的showRecentApps方法。 frameworks/base/packages/SystemUI/src/com/android/systemui/recents/Recents.java public class Recents extends SystemUI implements CommandQueue.Callbacks {private final RecentsImplementation mImpl;private final CommandQueue mCommandQueue;public Recents(Context context, RecentsImplementation impl, CommandQueue commandQueue) {super(context);mImpl impl;mCommandQueue commandQueue;}Overridepublic void start() {mCommandQueue.addCallback(this);mImpl.onStart(mContext);}//显示最近任务Overridepublic void showRecentApps(boolean triggeredFromAltTab) {// Ensure the device has been provisioned before allowing the user to interact with// recentsif (!isUserSetup()) {return;}android.util.Log.d(SystemUI.Recents, showRecentApps: triggeredFromAltTab triggeredFromAltTab);mImpl.showRecentApps(triggeredFromAltTab);}}Recents的showRecentApps方法会进一步调用RecentsImplementation的showRecentApps方法。
4、RecentsImplementation是一个接口。 frameworks/base/packages/SystemUI/src/com/android/systemui/recents/RecentsImplementation.java public interface RecentsImplementation {default void onStart(Context context) {}default void onBootCompleted() {}default void onAppTransitionFinished() {}default void onConfigurationChanged(Configuration newConfig) {}default void preloadRecentApps() {}default void cancelPreloadRecentApps() {}default void showRecentApps(boolean triggeredFromAltTab) {}default void hideRecentApps(boolean triggeredFromAltTab, boolean triggeredFromHomeKey) {}default void toggleRecentApps() {}default void dump(PrintWriter pw) {}
}5、在SystemUI模块的具体实现类是OverviewProxyRecentsImpl。 frameworks/base/packages/SystemUI/src/com/android/systemui/recents/OverviewProxyRecentsImpl.java public class OverviewProxyRecentsImpl implements RecentsImplementation {private final static String TAG OverviewProxyRecentsImpl;Nullableprivate final LazyOptionalStatusBar mStatusBarOptionalLazy;private Context mContext;private Handler mHandler;private TrustManager mTrustManager;private OverviewProxyService mOverviewProxyService;SuppressWarnings(OptionalUsedAsFieldOrParameterType)Injectpublic OverviewProxyRecentsImpl(LazyOptionalStatusBar statusBarOptionalLazy) {mStatusBarOptionalLazy statusBarOptionalLazy;}Overridepublic void onStart(Context context) {mContext context;mHandler new Handler();mTrustManager (TrustManager) context.getSystemService(Context.TRUST_SERVICE);//为OverviewProxyService赋值mOverviewProxyService Dependency.get(OverviewProxyService.class);}Overridepublic void showRecentApps(boolean triggeredFromAltTab) {android.util.Log.d(SystemUI.OverviewProxyRecentsImpl, showRecentApps: triggeredFromAltTab triggeredFromAltTab);//IOverviewProxy是一个aidl最初是调用OverviewProxyService的getProxy方法进行赋值的IOverviewProxy overviewProxy mOverviewProxyService.getProxy();if (overviewProxy ! null) {try {//继续调用onOverviewShown方法overviewProxy.onOverviewShown(triggeredFromAltTab);return;} catch (RemoteException e) {Log.e(TAG, Failed to send overview show event to launcher., e);}} else {// Do nothing}}}OverviewProxyRecentsImpl的showRecentApps方法会进一步调用代理者IOverviewProxy的onOverviewShown方法IOverviewProxy是一个aidl。这里调用OverviewProxyService的getProxy方法为overviewProxy赋值。mOverviewProxyService最初是通过Dependency进行赋值的。
6、OverviewProxyService类和getProxy方法相关代码如下所示。
public class OverviewProxyService extends CurrentUserTracker implementsCallbackControllerOverviewProxyListener, NavigationModeController.ModeChangedListener,Dumpable {//唤起Launcher3模块TouchInteractionService的Actionprivate static final String ACTION_QUICKSTEP android.intent.action.QUICKSTEP_SERVICE;//唤起Launcher3模块TouchInteractionService的Intentprivate final Intent mQuickStepIntent;//远程IPC通信是实现类private IOverviewProxy mOverviewProxy;private boolean mBound;public OverviewProxyService(Context context, CommandQueue commandQueue,LazyNavigationBarController navBarControllerLazy,LazyOptionalStatusBar statusBarOptionalLazy,NavigationModeController navModeController,NotificationShadeWindowController statusBarWinController, SysUiState sysUiState,OptionalPip pipOptional,OptionalLegacySplitScreen legacySplitScreenOptional,OptionalSplitScreen splitScreenOptional,OptionalOneHanded oneHandedOptional,OptionalRecentTasks recentTasks,OptionalStartingSurface startingSurface,BroadcastDispatcher broadcastDispatcher,ShellTransitions shellTransitions,ScreenLifecycle screenLifecycle,SmartspaceTransitionController smartspaceTransitionController,UiEventLogger uiEventLogger,DumpManager dumpManager) {super(broadcastDispatcher);...代码省略...//获取最近任务组件名称mRecentsComponentName ComponentName.unflattenFromString(context.getString(com.android.internal.R.string.config_recentsComponentName));//创建最近任务Activity的意图对象mQuickStepIntent new Intent(ACTION_QUICKSTEP).setPackage(mRecentsComponentName.getPackageName());...代码省略...startConnectionToCurrentUser();...代码省略...}//成功绑定服务所返回的ServiceConnection对象private final ServiceConnection mOverviewServiceConnection new ServiceConnection() {Overridepublic void onServiceConnected(ComponentName name, IBinder service) {...代码省略...//拿到IOverviewProxy对象为后续跨进程通信做准备mOverviewProxy IOverviewProxy.Stub.asInterface(service);...代码省略...}};private void internalConnectToCurrentUser() {...代码省略... Intent launcherServiceIntent new Intent(ACTION_QUICKSTEP).setPackage(mRecentsComponentName.getPackageName());try {//绑定服务mBound mContext.bindServiceAsUser(launcherServiceIntent,mOverviewServiceConnection,Context.BIND_AUTO_CREATE | Context.BIND_FOREGROUND_SERVICE_WHILE_AWAKE,UserHandle.of(getCurrentUserId()));} catch (SecurityException e) {Log.e(TAG_OPS, Unable to bind because of security error, e);}...代码省略...}public IOverviewProxy getProxy() {return mOverviewProxy;} }对以上代码做个简单总结
1为最近任务组件名称mRecentsComponentName赋值。 frameworks/base/core/res/res/values/config.xml string nameconfig_recentsComponentName translatablefalsecom.android.launcher3/com.android.quickstep.RecentsActivity/string2创建最近任务Activity的意图对象mQuickStepIntent 3创建最近任务服务的意图对象launcherServiceIntent并进行服务绑定触发mOverviewServiceConnection的回调方法onServiceConnected 为类型为远程IPC通信的实现类mOverviewProxy对象赋值。 4调用的getProxy获得远程通信的实现类
二、Launcher3模块显示最近任务的相关代码
梳理完了SystemUI模块和最近任务相关的代码我们再来看下Launcher3模块相关的代码。
1、通过上面我们可以知道SystemUI模块启动的时候会启动Launcher3模块的最近任务服务另外还有提到了最近任务Activity组件 二者的声明如下所示。 packages/apps/Launcher3/quickstep/AndroidManifest.xml ?xml version1.0 encodingutf-8?
manifest xmlns:androidhttp://schemas.android.com/apk/res/androidxmlns:toolshttp://schemas.android.com/toolspackagecom.android.launcher3application android:backupAgentcom.android.launcher3.LauncherBackupAgentservice android:namecom.android.quickstep.TouchInteractionServiceandroid:permissionandroid.permission.STATUS_BAR_SERVICEandroid:directBootAwaretrueandroid:exportedtrueintent-filteraction android:nameandroid.intent.action.QUICKSTEP_SERVICE//intent-filter/serviceactivity android:namecom.android.quickstep.RecentsActivityandroid:excludeFromRecentstrueandroid:launchModesingleTaskandroid:clearTaskOnLaunchtrueandroid:stateNotNeededtrueandroid:themestyle/LauncherThemeandroid:screenOrientationunspecifiedandroid:configChangeskeyboard|keyboardHidden|mcc|mnc|navigation|orientation|screenSize|screenLayout|smallestScreenSizeandroid:resizeableActivitytrueandroid:resumeWhilePausingtrueandroid:taskAffinity//application/manifest
2、第一节我们讲过要想显示最近任务需要调用CommandQueue的showRecentApps方法而该方法最终调用的其实是IOverviewProxy的onOverviewShown。 这里我们具体看一下这个aidl的具体内容。 frameworks/base/packages/SystemUI/shared/src/com/android/systemui/shared/recents/IOverviewProxy.aidl oneway interface IOverviewProxy {void onActiveNavBarRegionChanges(in Region activeRegion) 11;void onInitialize(in Bundle params) 12;/*** Sent when overview button is pressed to toggle show/hide of overview.*/void onOverviewToggle() 6;/*** 显示最近任务*/void onOverviewShown(boolean triggeredFromAltTab) 7;/*** Sent when overview is to be hidden.*/void onOverviewHidden(boolean triggeredFromAltTab, boolean triggeredFromHomeKey) 8;/*** Sent when there was an action on one of the onboarding tips view.* TODO: Move this implementation to SystemUI completely*/void onTip(int actionType, int viewType) 10;/*** Sent when device assistant changes its default assistant whether it is available or not.*/void onAssistantAvailable(boolean available) 13;/*** Sent when the assistant changes how visible it is to the user.*/void onAssistantVisibilityChanged(float visibility) 14;/*** Sent when back is triggered.* TODO: Move this implementation to SystemUI completely*/void onBackAction(boolean completed, int downX, int downY, boolean isButton,boolean gestureSwipeLeft) 15;/*** Sent when some system ui state changes.*/void onSystemUiStateChanged(int stateFlags) 16;/*** Sent when the split screen is resized*/void onSplitScreenSecondaryBoundsChanged(in Rect bounds, in Rect insets) 17;/*** Sent when suggested rotation button could be shown*/void onRotationProposal(int rotation, boolean isValid) 18;/*** Sent when disable flags change*/void disable(int displayId, int state1, int state2, boolean animate) 19;/*** Sent when behavior changes. See WindowInsetsController#Behavior*/void onSystemBarAttributesChanged(int displayId, int behavior) 20;/*** Sent when screen turned on and ready to use (blocker scrim is hidden)*/void onScreenTurnedOn() 21;/*** Sent when the desired dark intensity of the nav buttons has changed*/void onNavButtonsDarkIntensityChanged(float darkIntensity) 22;
}
3、Launcher3模块的最近任务服务TouchInteractionService和onOverviewShown方法相关的代码如下所示。 packages/apps/Launcher3/quickstep/src/com/android/quickstep/TouchInteractionService.java public class TouchInteractionService extends Serviceimplements ProtoTraceableLauncherTraceProto.Builder {private OverviewCommandHelper mOverviewCommandHelper;private final TISBinder mTISBinder new TISBinder();/*** Local IOverviewProxy implementation with some methods for local components*/public class TISBinder extends IOverviewProxy.Stub {BinderThreadOverridepublic void onOverviewShown(boolean triggeredFromAltTab) {android.util.Log.d(Launcher3.TouchInteractionService, onOverviewShown: triggeredFromAltTab triggeredFromAltTab);if (triggeredFromAltTab) {TaskUtils.closeSystemWindowsAsync(CLOSE_SYSTEM_WINDOWS_REASON_RECENTS);mOverviewCommandHelper.addCommand(OverviewCommandHelper.TYPE_SHOW_NEXT_FOCUS);} else {mOverviewCommandHelper.addCommand(OverviewCommandHelper.TYPE_SHOW);}}}Overridepublic IBinder onBind(Intent intent) {Log.d(TAG, Touch service connected: user getUserId());return mTISBinder;}
} TISBinder对象的onOverviewShown方法被SystemUI所触发的时候会进一步调用OverviewCommandHelper对象的addCommand方法传入TYPE_SHOW。
4、OverviewCommandHelper和显示最近任务相关的代码如下所示。
public class OverviewCommandHelper {public static final int TYPE_SHOW 1;//显示public static final int TYPE_SHOW_NEXT_FOCUS 2;public static final int TYPE_HIDE 3;//隐藏public static final int TYPE_TOGGLE 4;//切换public static final int TYPE_HOME 5;//首页public void addCommand(int type) {CommandInfo cmd new CommandInfo(type);MAIN_EXECUTOR.execute(() - addCommand(cmd));}private void addCommand(CommandInfo cmd) {boolean wasEmpty mPendingCommands.isEmpty();mPendingCommands.add(cmd);if (wasEmpty) {executeNext();}}private void executeNext() {if (mPendingCommands.isEmpty()) {return;}CommandInfo cmd mPendingCommands.get(0);//层层调用最终触发executeCommand方法。if (executeCommand(cmd)) {scheduleNextTask(cmd);}}private T extends StatefulActivity? boolean executeCommand(CommandInfo cmd) {BaseActivityInterface?, T activityInterface mOverviewComponentObserver.getActivityInterface();RecentsView recents activityInterface.getVisibleRecentsView();if (recents null) {//如果视图为空说明最近任务视图不可见if (cmd.type TYPE_HIDE) {// already hiddenreturn true;}if (cmd.type TYPE_HOME) {android.util.Log.d(Launcher3.OverviewCommandHelper, executeCommand cmd.type TYPE_HOME);mService.startActivity(mOverviewComponentObserver.getHomeIntent());LauncherSplitScreenListener.INSTANCE.getNoCreate().notifySwipingToHome();return true;}} else {//如果视图不为空说明最近任务视图可见switch (cmd.type) {case TYPE_SHOW:// already visiblereturn true;case TYPE_HIDE: {int currentPage recents.getNextPage();TaskView tv (currentPage 0 currentPage recents.getTaskViewCount())? (TaskView) recents.getPageAt(currentPage): null;return launchTask(recents, tv, cmd);}case TYPE_TOGGLE:return launchTask(recents, getNextTask(recents), cmd);case TYPE_HOME:android.util.Log.d(Launcher3.OverviewCommandHelper, executeCommand TYPE_HOME);recents.startHome();LauncherSplitScreenListener.INSTANCE.getNoCreate().notifySwipingToHome();return true;}}...代码省略...return false;}}
