Android PopupWindow 点击外面取消实现代码

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);//需要设置为ture,表示可以聚焦

        //需要设置背景,用物理键返回的时候
			        mPopupWindow.setBackgroundDrawable(new BitmapDrawable(getResources()));
			        mPopupWindow.setOutsideTouchable(true);

      view.setOnTouchListener(new OnTouchListener()// 需要设置,点击之后取消popupview,即使点击外面,也可以捕获事件
      {
        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);// 显示再指定控件的下面
    }

  }

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