从叠加视图到背景调度触摸事件

Question

我有以下服务来显示系统中每个应用的叠加视图并获取触摸事件。由于TYPE_SYSTEM_ALERT，触摸无法进入背景，因此无用。我以为我可以获得一个MotionEvent并使用我刚刚检测到的相同的x，y将它发送到背景视图。

**问题：如何定义我将发送事件的背景视图？鉴于我可以随时检测前台应用程序是什么，我可以定义该窗口的视图以便我可以调度该事件吗？

public class OverlayService extends Service {

    LinearLayout oView;

    @Override
    public IBinder onBind(Intent i) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        oView = new LinearLayout(this);   
        oView.setBackgroundColor(0x88ff0000); // The translucent red color
        WindowManager.LayoutParams params = new WindowManager.LayoutParams(
                WindowManager.LayoutParams.MATCH_PARENT,
                WindowManager.LayoutParams.MATCH_PARENT,
                WindowManager.LayoutParams.TYPE_SYSTEM_ALERT,
                0 | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                PixelFormat.TRANSLUCENT);        
        WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
        wm.addView(oView, params);

        oView.setOnTouchListener(new View.OnTouchListener() {

            @SuppressLint("Recycle")
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                // TODO Auto-generated method stub
                switch (event.getAction()){
                case MotionEvent.ACTION_DOWN:
                    int x = (int) event.getX();
                    int y = (int) event.getY();
                    long downTime = SystemClock.uptimeMillis();
                    long eventTime = SystemClock.uptimeMillis() + 100;
                    // List of meta states found here: developer.android.com/reference/android/view/KeyEvent.html#getMetaState()
                    int metaState = 0;
                    MotionEvent motionEvent = MotionEvent.obtain(
                        downTime, 
                        eventTime, 
                        MotionEvent.ACTION_DOWN, 
                        x, 
                        y, 
                        metaState
                    );
                     Toast.makeText(getBaseContext(), Integer.toString(x)+"    "+Integer.toString(y), Toast.LENGTH_SHORT).show();
                    // Dispatch touch event to background
                    //              ?
                    //              ?
                    // Dispatch touch event to background



                }
                // Obtain MotionEvent object

                return false;
            }
        });

    }

    @Override
    public void onDestroy() {            
        super.onDestroy();
        if(oView!=null){
            WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
            wm.removeView(oView);
        }
    }

}