先來看下Android API 的這個Methods:

public void setOutsideTouchable (boolean touchable)

Controls whether the pop-up will be informed of touch events outside of its window. This only makes sense for pop-ups that are touchable but not focusable, which means touches outside of the window will be delivered to the window behind. The default is false.

If the popup is showing, calling this method will take effect only the next time the popup is shown or through a manual call to one of the methods.

Parameters

touchable	true if the popup should receive outside touch events, false otherwise

就是說,基本通過這個屬性和setFocusable(true);就能實現點選別的區域讓popup消失,

也可以這樣做,設定點選popup窗體自身,讓其消失,通過下邊的方法即root重寫onTouch方法:

 //點選窗體,PopupWindow消失           
                root.setOnTouchListener(new View.OnTouchListener() {
                    @Override
                    public boolean onTouch(View v, MotionEvent event) {
                        popup.dismiss();
                        return true;
                    }
                });
 

同樣, 可以不用重寫root的onTouch方法,而該重寫 Activity的onTouchEvent()方法,正常情況下也能實現popup消失.

  @Override
    public boolean onTouchEvent(MotionEvent event) {  
        if (popup != null && popup.isShowing()) { 
            popup.dismiss(); 
            popup= null; 
        } 
        return super.onTouchEvent(event);
    }
 

但是, 我遇到一個問題,就是上述的方法都解決不了, 是什麼原因? 

其實,罪魁禍首就是, popup的程式碼順序, 手賤先呼叫了 showAsDropDown()方法,在設定其他屬性,導致了這種情況.

showAsDropDown這個方法相當於 Dialog.show()方法,  如果是先show了, 然後其他屬性即使是設定了,也起不到應有的作用. 

這一點,經常提醒別人,沒想到到popup這裡我犯了同樣的錯誤.