Android PhoneWindowManager监听屏幕右侧向左滑动实现返回功能

由于项目没有设计返回键，一旦进入别的应用，就无法回到桌面。只能通过串口输入input keyevent 4（返回键）来返回桌面，为了方便调试，在framework 中监听手势，实现返回功能。

       在frameworksbaseservicescorejavacomandroidserverpolicyPhoneWindowManager中有这么一段代码

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);
   }
 });

代码中监听了手势操作，其中onSwipeFromRight()就是当从屏幕的右侧向左滑动时会触发，只要在这里加入返回的功能即可；

实现返回按键的功能代码如下

private void sendKeyCode(final int keyCode) {
    new Thread(new Runnable() {
      @Override
      public void run() {
 try {
   // 创建一个Instrumentation对象
   Instrumentation inst = new Instrumentation();
   // 调用inst对象的按键模拟方法
   inst.sendKeyDownUpSync(keyCode);
 } catch (Exception e) {
   e.printStackTrace();
 }
      }
    }).start();
  }

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