Android PopupWindow click outside to cancel the implementation code

private void showPopupView()
  {
    if (mPopupWindow == null)
    {
      View view = getLayoutInflater().inflate(R.layout.newest_layout, null);
      mPopupWindow = new PopupWindow(view, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
      mPopupWindow.setFocusable(true);// I need to set it to ture , means you can focus 

　　　　　　　　// You need to set the background and return it with the physical key 
			　　　　　　　　mPopupWindow.setBackgroundDrawable(new BitmapDrawable(getResources()));
			　　　　　　　　mPopupWindow.setOutsideTouchable(true);

      view.setOnTouchListener(new OnTouchListener()//  You need to set it, click and cancel popupview , you can capture the event even by clicking on the outside 
      {
        public boolean onTouch(View v, MotionEvent event)
        {
          if (mPopupWindow.isShowing())
          {
            Trace.Log("-------------------onTouch------------");
            mPopupWindow.dismiss();
          }
          return false;
        }
      });

    }

    if (mPopupWindow.isShowing())
    {
      mPopupWindow.dismiss();
    }
    else
    {
      View parent = findViewById(R.id.newest);
      mPopupWindow.showAsDropDown(parent);//  Displays the bottom of the specified control 
    }

  }