android的popupwindow點擊返回按鈕關閉

今天想實現點擊Popupwindow的外邊不消失，點擊返回鍵popupwindow自動關閉的效果，網上找了找，發現沒有完整的，零碎的而且不準確，於是自己琢磨了一下，試了試效果。以下是實現效果的代碼

View keyboardView = LayoutInflater.from(activity).inflate(R.layout.random_keyboard, null);  popupWindow = new PopupWindow(keyboardView,LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT,false);//設定點擊視窗外邊視窗消失  popupWindow.setOutsideTouchable(false);    // 設定此參數獲得焦點，否則無法點擊  popupWindow.setFocusable(true); // popupWindow.setBackgroundDrawable(new BitmapDrawable());  //comment by danielinbiti,如果添加了這行，那麼標註1和標註2那兩行不用加，加上這行的效果是點popupwindow的外邊也能關閉 keyboardView.setFocusable(true);//comment by danielinbiti,設定view能夠接聽事件，標註1 keyboardView.setFocusableInTouchMode(true); //comment by danielinbiti,設定view能夠接聽事件 標註2 keyboardView.setOnKeyListener(new OnKeyListener(){@Overridepublic boolean onKey(View arg0, int arg1, KeyEvent arg2) {     if (arg1 == KeyEvent.KEYCODE_BACK){      if(popupWindow != null) {      close();     }      }      return false; } });