由於專案沒有設計返回鍵，一旦進入別的應用，就無法回到桌面。只能通過串列埠輸入input keyevent 4（返回鍵）來返回桌面，為了方便除錯，在Framework 中監聽手勢，實現返回功能。

在frameworks\base\services\core\java\com\android\server\policy\PhoneWindowManager中有這麼一段程式碼

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);
          }
        });

程式碼中監聽了手勢操作，其中onSwipeFromRight()就是當從螢幕的右側向左滑動時會觸發，只要在這裡加入返回的功能即可；

實現返回按鍵的功能程式碼如下

private void sendKeyCode(final int keyCode) {
    new Thread(new Runnable() {
      @Override
      public void run() {
        try {
          // 建立一個Instrumentation物件
          Instrumentation inst = new Instrumentation();
          // 呼叫inst物件的按鍵模擬方法
          inst.sendKeyDownUpSync(keyCode);
        } catch (Exception e) {
          e.printStackTrace();
        }
      }
    }).start();
  }

總結

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