Android三指截屏的实现

 三指截屏是用户三个手机点击屏幕向下滑，最终调用systemui的截屏服务实现截屏。所以其他只是做一个策略的实现。目前很多不少手机都实现了该功能，因此自己也尝试着实现该功能。1.首先是注册事件，监听用户是否设置打开了三指截屏功能。

if(Feature.FEATURE_THREE_FINGER_SCREENSHOT){                                                                       resolver.registerContentObserver( Settings.System.getUriFor("pointer_screenshotchord"), false, this,    UserHandle.USER_ALL);}

监听pointer_screenshotchord 这个值得变化
如果发生了改变获取该值得数据并通过Handler发送消息：

f(Feature.FEATURE_THREE_FINGER_SCREENSHOT){if (mSystemReady) {int pointerScreenshotChordMode = Settings.System.getIntForUser(resolver,"pointer_screenshotchord", 0, UserHandle.USER_CURRENT);if (mPointerScreenshotChordMode != pointerScreenshotChordMode) {mPointerScreenshotChordMode = pointerScreenshotChordMode;mHandler.sendEmptyMessage(pointerScreenshotChordMode != 0 ?MSG_ENABLE_POINTER_SCREEN_SHOT_CHORD : MSG_DISABLE_POINTER_SCREEN_SHOT_CHORD);}}}

如果pointerScreenshotChordMode！=0则发送MSG_ENABLE_POINTER_SCREEN_SHOT_CHORD消息开启截屏否则取消截屏功能。
下面看看消息怎么处理的。

case MSG_ENABLE_POINTER_SCREEN_SHOT_CHORD:if (Feature.FEATURE_THREE_FINGER_SCREENSHOT ) {enableFingerScreenshot(); //开启截屏}break;
case MSG_DISABLE_POINTER_SCREEN_SHOT_CHORD:if (Feature.FEATURE_THREE_FINGER_SCREENSHOT) {disableFingerScreenshot();//取消截屏}break;

接着看看enableFingerScreenshot（）这个方法

private void enableFingerScreenshot() {// TODO Auto-generated method stubSlog.d(TAG, "enablePointerScreenshotChord");if (mFingerScreenshotView == null) {mFingerScreenshotView = new                   FingerScreenshotView(mContext);Slog.d(TAG, "new PointerScreenshotChordView");mFingerScreenshotPointerEventListener = new FingerScreenshotPointerEventListener();mWindowManagerFuncs.registerPointerEventListener(mFingerScreenshotPointerEventListener);}}

可以看出主要是注册事件监听

再看看disableFingerScreenshot():

private void disableFingerScreenshot() {// TODO Auto-generated method stubif (mFingerScreenshotPointerEventListener != null) {mWindowManagerFuncs.unregisterPointerEventListener(mFingerScreenshotPointerEventListener);mFingerScreenshotPointerEventListener = null;}if (mFingerScreenshotView != null) {/*WindowManager wm = (WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE);wm.removeView(mFingerScreenshotView);*/mFingerScreenshotView = null;}}

主要是取消注册事件。
接着就是对事件的监听和响应处理。

private final class FingerScreenshotPointerEventListener implements PointerEventListener {@Overridepublic void onPointerEvent(MotionEvent motionEvent) {if (mFingerScreenshotView != null) {mFingerScreenshotView.onTouchEvent(motionEvent);}}
}

可以看出最后是调用mFingerScreenshotView.onTouchEvent(motionEvent);方法处理

@Overridepublic boolean onTouchEvent(MotionEvent event) {// TODO Auto-generated method stubint cnt = event.getPointerCount();switch (event.getAction()) {case MotionEvent.ACTION_DOWN:printLog("\n\nACTION_DOWN ");initThreshold(mContext);printLog("MIN_DISTANCE :" + MIN_DISTANCE);fingercount = 0;ry_pointer3_down = 0;ry_pointer3_move = 0;break;case MotionEvent.ACTION_UP:if (isShotSuccess() && !isScreenLock(mContext)) {mHandler.post(mPointerScreenshotRunnable); //三指成功}restoreShotScreenPropertiesFlag();endTime = startTime;break;case MotionEvent.ACTION_MOVE:ry_pointer3_move = (int) event.getY();if (fingercount < event.getPointerCount()) {fingercount = event.getPointerCount();}if(3 == cnt){for(int i = 0; i < cnt; i ++){mEnd[i] = (int) event.getY(i);}}break;

如果三个手指成功了则执行一个线程
mHandler.post(mPointerScreenshotRunnable)；

如下：

private final Runnable mPointerScreenshotRunnable = new Runnable() {public void run() {Intent intent = new Intent(PointerScreenshotChord);            intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY| Intent.FLAG_RECEIVER_FOREGROUND);mContext.sendBroadcastAsUser(intent, UserHandle.ALL);}
};

这个是发送广播消息代表三指成功。
因此在phoneWindow下面必须动态注册广播。

mPointerScreenshotChordReceiver = new PointerScreenshotChordReceiver();IntentFilter screenOffIntentFilter = new IntentFilter();screenOffIntentFilter.addAction(PointerScreenshotChord);context.registerReceiver(mPointerScreenshotChordReceiver, screenOffIntentFilter);

//接收广播

private class PointerScreenshotChordReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {Slog.d("PointerScreenshotChordView", "mScreenshotRunnable ");mHandler.post(mScreenshotRunnable);}
}

如果接受到了广播执行下面这个线程

private class ScreenshotRunnable implements Runnable {private int mScreenshotType = TAKE_SCREENSHOT_FULLSCREEN;public void setScreenshotType(int screenshotType) {mScreenshotType = screenshotType;}@Overridepublic void run() {takeScreenshot(mScreenshotType);}}

最后调用
takeScreenshot(mScreenshotType);方法截屏

//开始截屏private void takeScreenshot(final int screenshotType) {Log.d(TAG, "takeScreenshot: " + screenshotType);synchronized (mScreenshotLock) {if (mScreenshotConnection != null) {if (messenger != null) {Log.d(TAG, "takeScreenshot use old service to take screenshot");msg.what = screenshotType;msg.arg1 = msg.arg2 = 0;if (mStatusBar != null && mStatusBar.isVisibleLw())msg.arg1 = 1;if (mNavigationBar != null && mNavigationBar.isVisibleLw())msg.arg2 = 1;try {messenger.send(msg);} catch (RemoteException e) {}return;}Log.d(TAG, "takeScreenshot before multi-functional screenshot, unbind old service");mContext.unbindService(mScreenshotConnection);mScreenshotConnection = null;messenger = null;msg = null;//return;filletScreen(false);}final ComponentName serviceComponent = new ComponentName(SYSUI_PACKAGE,SYSUI_SCREENSHOT_SERVICE_EXT);final Intent serviceIntent = new Intent();serviceIntent.setComponent(serviceComponent);ServiceConnection conn = new ServiceConnection() {@Overridepublic void onServiceConnected(ComponentName name, IBinder service) {synchronized (mScreenshotLock) {if (mScreenshotConnection != this) {return;}messenger = new Messenger(service);msg = Message.obtain(null, screenshotType);final ServiceConnection myConn = this;Handler h = new Handler(mHandler.getLooper()) {@Overridepublic void handleMessage(Message msg) {synchronized (mScreenshotLock) {if (mScreenshotConnection == myConn) {mContext.unbindService(mScreenshotConnection);mScreenshotConnection = null;mHandler.removeCallbacks(mScreenshotTimeout);messenger = null;msg = null;filletScreen(true);}}}};msg.replyTo = new Messenger(h);msg.arg1 = msg.arg2 = 0;if (mStatusBar != null && mStatusBar.isVisibleLw())msg.arg1 = 1;if (mNavigationBar != null && mNavigationBar.isVisibleLw())msg.arg2 = 1;try {messenger.send(msg);} catch (RemoteException e) {}}}@Overridepublic void onServiceDisconnected(ComponentName name) {synchronized (mScreenshotLock) {if (mScreenshotConnection != null) {mContext.unbindService(mScreenshotConnection);mScreenshotConnection = null;mHandler.removeCallbacks(mScreenshotTimeout);notifyScreenshotError();messenger = null;msg = null;filletScreen(true);}}}};if (mContext.bindServiceAsUser(serviceIntent, conn,Context.BIND_AUTO_CREATE | Context.BIND_FOREGROUND_SERVICE_WHILE_AWAKE,UserHandle.CURRENT)) {mScreenshotConnection = conn;//mHandler.postDelayed(mScreenshotTimeout, 10000);}}}

代码有点长，可以去分析，最终调用systemui的服务区开启截屏，看了一下源码，最后服务调用surfaceflinger开启截屏。后面的没再去分析了。

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