一个TYPE_SYSTEM_OVERLAY内GestureDetector

问题描述

我创建了一个 TYPE_SYSTEM_OVERLAY ，我希望捕捉到手指/使用服务触及这个叠加的事件。

该覆盖工作正常，但问题是它不能捕捉触摸事件，当我尝试纳入 GestureDetector 在里面。当我点击屏幕上，面包味精onDown没有显示..

将AP preciate如果有人告诉我，我在哪里出了错:(我已经试过落实 GestureDetector 的之外OverlayView的类，但也没有任何结果。

 公共类NUSLogService扩展IntentService {
      OverlayView的MView的;      @覆盖
       公共无效的onCreate（）{
          super.onCreate（）;          最后WindowManager.LayoutParams PARAMS =新WindowManager.LayoutParams（
              WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY，
              WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH，
              PixelFormat.TRANSLUCENT）;              params.gravity = Gravity.RIGHT | Gravity.BOTTOM;
              params.setTitle（TouchLayer）;
              MVIEW =新OverlayView的（getApplicationContext（））;          最后的窗口管理器，WM =（窗口管理器）getSystemService（WINDOW_SERVICE）;
              wm.addView（MVIEW，则params）;
      }
     @覆盖
     公共无效的onDestroy（）{
          super.onDestroy（）;
          如果（MVIEW！= NULL）
          {
            （（窗口管理器）getSystemService（WINDOW_SERVICE））removeView（MVIEW）。
            MVIEW = NULL;
          }
      }    //自取覆盖类
    类OverlayView的扩展的ViewGroup实现OnGestureListener {      私人GestureDetector gestureScanner =新GestureDetector（本）;      公共OverlayView的（上下文的背景下）{
         超级（上下文）;
         Toast.makeText（的getContext（），OverlayView的，Toast.LENGTH_SHORT）.show（）;
      }      @覆盖
       公共布尔onTouchEvent（MotionEvent事件）{
  //返回super.onTouchEvent（事件）;
           返回gestureScanner.onTouchEvent（事件）;
      }      @覆盖
      保护无效onLayout（布尔为arg0，ARG1 INT，INT ARG2，诠释ARG3，诠释ARG4）{
      // TODO自动生成方法存根
      }      @覆盖
      公共布尔onDown（MotionEvent五）{
         Toast.makeText（的getContext（），onDown，Toast.LENGTH_SHORT）.show（）;
         返回false;
      }
}
 

解决方案

首先，这不应该是一个 IntentService 。在当前的实施，的onDestroy（）将在的onCreate称为一两毫秒（）。

二， TYPE_SYSTEM_OVERLAY 不能接收任何触摸事件的Andr​​oid 4.0，出于安全原因。

I have created a TYPE_SYSTEM_OVERLAY and i wish to capture finger/touch events on this overlay using a service.

The overlay works fine, but the problem is it cannot capture touch events when i try to incorporate the GestureDetector in it. When i tap on screen, the toast msg "onDown" didnt show..

will appreciate if anyone tells me where have i went wrong :( I have tried implement the GestureDetector outside of the OverlayView class but also no result.

public class NUSLogService extends IntentService {
      OverlayView mView;

      @Override
       public void onCreate() {
          super.onCreate();

          final WindowManager.LayoutParams params = new WindowManager.LayoutParams(
              WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
              WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH,
              PixelFormat.TRANSLUCENT);

              params.gravity = Gravity.RIGHT | Gravity.BOTTOM;
              params.setTitle("TouchLayer");
              mView = new OverlayView(getApplicationContext());

          final WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
              wm.addView(mView, params);
      }
     @Override
     public void onDestroy() {
          super.onDestroy();
          if(mView  != null)
          {
            ((WindowManager) getSystemService(WINDOW_SERVICE)).removeView(mView );
            mView  = null;
          }
      }

    //self-created overlay class
    class OverlayView extends ViewGroup implements OnGestureListener{

      private GestureDetector gestureScanner = new GestureDetector(this);

      public OverlayView(Context context) {
         super(context);
         Toast.makeText(getContext(),"OverlayView", Toast.LENGTH_SHORT).show();
      }

      @Override
       public boolean onTouchEvent(MotionEvent event) {
  //        return super.onTouchEvent(event);
           return gestureScanner.onTouchEvent(event);
      }

      @Override
      protected void onLayout(boolean arg0, int arg1, int arg2, int arg3, int arg4) {
      // TODO Auto-generated method stub
      }

      @Override
      public boolean onDown(MotionEvent e) {
         Toast.makeText(getContext(),"onDown", Toast.LENGTH_SHORT).show();
         return false;
      }
}

解决方案

First, this should not be an IntentService. In your current implementation, onDestroy() will be called a millisecond or two after onCreate().

Second, TYPE_SYSTEM_OVERLAY cannot receive any touch events as of Android 4.0, for security reasons.

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