由于項目沒有設計返回鍵，一旦進入別的應用，就無法回到桌面。只能通過串口輸入input keyevent 4（返回鍵）來返回桌面，為了方便調試，在Framework 中監聽手勢，實現返回功能。

在frameworksbaseservicescorejavacomandroidserverpolicyPhoneWindowManager中有這么一段代碼

mSystemGestures = new SystemGesturesPointerEventListener(context,new SystemGesturesPointerEventListener.Callbacks() { @Override public void onSwipeFromTop() { Log.i('gyx','onSwipeFromTop'); if (mStatusBar != null) { requestTransientBars(mStatusBar); } } @Override public void onSwipeFromBottom() { Log.i('gyx','onSwipeFromBottom'); if (mNavigationBar != null && mNavigationBarPosition == NAV_BAR_BOTTOM) { requestTransientBars(mNavigationBar); } } @Override public void onSwipeFromRight() { Log.i('gyx','onSwipeFromRight'); sendKeyCode(4); Log.i('gyx','sendKeyCode 4'); if (mNavigationBar != null && mNavigationBarPosition == NAV_BAR_RIGHT) { requestTransientBars(mNavigationBar); } } @Override public void onSwipeFromLeft() { Log.i('gyx','onSwipeFromLeft'); if (mNavigationBar != null && mNavigationBarPosition == NAV_BAR_LEFT) { requestTransientBars(mNavigationBar); } } @Override public void onFling(int duration) { if (mPowerManagerInternal != null) { mPowerManagerInternal.powerHint( PowerHint.INTERACTION, duration); } } @Override public void onDebug() { // no-op } @Override public void onDown() { mOrientationListener.onTouchStart(); } @Override public void onUpOrCancel() { mOrientationListener.onTouchEnd(); } @Override public void onMouseHoverAtTop() { mHandler.removeMessages(MSG_REQUEST_TRANSIENT_BARS); Message msg = mHandler.obtainMessage(MSG_REQUEST_TRANSIENT_BARS); msg.arg1 = MSG_REQUEST_TRANSIENT_BARS_ARG_STATUS; mHandler.sendMessageDelayed(msg, 500); } @Override public void onMouseHoverAtBottom() { mHandler.removeMessages(MSG_REQUEST_TRANSIENT_BARS); Message msg = mHandler.obtainMessage(MSG_REQUEST_TRANSIENT_BARS); msg.arg1 = MSG_REQUEST_TRANSIENT_BARS_ARG_NAVIGATION; mHandler.sendMessageDelayed(msg, 500); } @Override public void onMouseLeaveFromEdge() { mHandler.removeMessages(MSG_REQUEST_TRANSIENT_BARS); }});

代碼中監聽了手勢操作，其中onSwipeFromRight()就是當從屏幕的右側向左滑動時會觸發，只要在這里加入返回的功能即可；

實現返回按鍵的功能代碼如下

private void sendKeyCode(final int keyCode) { new Thread(new Runnable() { @Override public void run() {try { // 創建一個Instrumentation對象 Instrumentation inst = new Instrumentation(); // 調用inst對象的按鍵模擬方法 inst.sendKeyDownUpSync(keyCode);} catch (Exception e) { e.printStackTrace();} } }).start(); }

總結

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