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

[java]
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(){ 
    @Override 
    public boolean onKey(View arg0, int arg1, KeyEvent arg2) { 
            if (arg1 == KeyEvent.KEYCODE_BACK){ 
            if(popupWindow != null) { 
                close(); 
                }  
            } 
             return false;  
    } 
 }); 

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(){
 @Override
 public boolean onKey(View arg0, int arg1, KeyEvent arg2) {
       if (arg1 == KeyEvent.KEYCODE_BACK){
        if(popupWindow != null) {
         close();
        }
       }
        return false;
 }
 });