Android 13屏蔽Activity或包的手势禁止滑动退出

在Android设备中，左/右滑两次会出现一个箭头然后退出Activity页面，有些Activity页面不想出现箭头及退出．

以下是对项目中的别人已实现的代码解析．

在config.xml中配置要禁用的Activity

packages/apps/Launcher3/quickstep/res/values/config.xml

resources中gesture_blocking_activitiesg添加Activity到item中，此例中为GestureSandboxActivity

                        com.android.launcher3/com.android.quickstep.interaction.GestureSandboxActivity    

后面所有代码都在这个java文件中

frameworks/base/packages/SystemUI/src/com/android/systemui/navigationbar/gestural/EdgeBackGestureHandler.java

config.xml中禁用内容读出来

EdgeBackGestureHandler构造函数中把config.xml中内容读出来，把禁用的Activity读到mGestureBlockingActivities.contains变量中．

    // Activities which should not trigger Back gesture.    private final List mGestureBlockingActivities = new ArrayList();            ComponentName recentsComponentName = ComponentName.unflattenFromString(                context.getString(com.android.internal.R.string.config_recentsComponentName));        if (recentsComponentName != null) {            String recentsPackageName = recentsComponentName.getPackageName();            PackageManager manager = context.getPackageManager();            try {                Resources resources = manager.getResourcesForApplication(                        manager.getApplicationInfo(recentsPackageName,                                PackageManager.MATCH_UNINSTALLED_PACKAGES                                        | PackageManager.MATCH_DISABLED_COMPONENTS                                        | PackageManager.GET_SHARED_LIBRARY_FILES));                int resId = resources.getIdentifier(                        "gesture_blocking_activities", "array", recentsPackageName);                if (resId == 0) {                    Log.e(TAG, "No resource found for gesture-blocking activities");                } else {                    String[] gestureBlockingActivities = resources.getStringArray(resId);                    for (String gestureBlockingActivity : gestureBlockingActivities) {                        mGestureBlockingActivities.add(                                ComponentName.unflattenFromString(gestureBlockingActivity));                    }                }            } catch (NameNotFoundException e) {                Log.e(TAG, "Failed to add gesture blocking activities", e);            }        }

函数判断是否要对当前Activity进行手势禁用

isGestureBlockingActivityRunning函数用于判断是否要对当前Activity进行手势禁用．

    private boolean isGestureBlockingActivityRunning() {        ActivityManager.RunningTaskInfo runningTask =                ActivityManagerWrapper.getInstance().getRunningTask();        ComponentName topActivity = runningTask == null ? null : runningTask.topActivity;        if (topActivity != null) {            mPackageName = topActivity.getPackageName();        } else {            mPackageName = "_UNKNOWN";        }        return topActivity != null && mGestureBlockingActivities.contains(topActivity);    }

监听应用任务变化，判断当前是否要禁用手势

mGestureBlockingActivityRunning为true则要禁用．

    private boolean mGestureBlockingActivityRunning;            private TaskStackChangeListener mTaskStackListener = new TaskStackChangeListener() {        @Override        public void onTaskStackChanged() {            mGestureBlockingActivityRunning = isGestureBlockingActivityRunning();        }        @Override        public void onTaskCreated(int taskId, ComponentName componentName) {            if (componentName != null) {                mPackageName = componentName.getPackageName();            } else {                mPackageName = "_UNKNOWN";            }        }        @Override        public void onActivityPinned(String packageName, int userId, int taskId, int stackId) {            mIsInPipMode = true;        }        @Override        public void onActivityUnpinned() {            mIsInPipMode = false;        }    };

禁用

在onMotionEvent函数中，设置mAllowGesture为false就会禁用手势，其中 mGestureBlockingActivityRunning为true时会设置mAllowGesture为false，这个变量赋值后面会提到．

    private void onMotionEvent(MotionEvent ev) {        int action = ev.getActionMasked();        if (action == MotionEvent.ACTION_DOWN) {            if (DEBUG_MISSING_GESTURE) {                Log.d(DEBUG_MISSING_GESTURE_TAG, "Start gesture: " + ev);            }            // Verify if this is in within the touch region and we aren't in immersive mode, and            // either the bouncer is showing or the notification panel is hidden            mInputEventReceiver.setBatchingEnabled(false);            mIsOnLeftEdge = ev.getX()                 mEdgeBackPlugin.setIsLeftPanel(mIsOnLeftEdge);                mEdgeBackPlugin.onMotionEvent(ev);            }