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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