Android 更新PopupWindow里ContentView中具体的textView内容

参考：http://www.it1352.com/119275.html

原著如下

问 题

Basically, I have a TextView in a layout which I use for a PopupWindow. I show this PopupWindow when a user clicks a button; I want to be able to dynamically change the text in the PopupWindow upon button click. However, findViewById(my_textview).setText() does not seem to do anything, and indeed causes the PopupWindow to no longer show when I click the button.

I can set text from the layout xml fine.

Anyone know what's up with this? Thanks-

基本上，我有，我用了一个PopupWindow布局一个TextView。我表明，当用户点击一个按钮，这个PopupWindow;我希望能够在点击按钮来动态更改PopupWindow文本。然而，findViewById（my_textview）.setText（）似乎并没有做任何事情，确实会导致PopupWindow当我按一下按钮不再显示。

我可以设置从布局XML精细的文本。

任何人都知道什么是这个吗？谢谢 -

I solved the problem. For whatever reason you need to call popup.getContentView().findViewById instead of just findViewById (where popup is your PopupWindow object). I wasn't getting a NullPointerException before so I'm not exactly sure why this fixed the issue but it did.

So the code goes something like:

我解决了这个问题。不管什么原因，你需要调用popup.getContentView（）。findViewById，而不是仅仅findViewById（其中弹出你PopupWindow对象）。我没有得到一个NullPointerException异常之前，所以我不知道是什么原因这个固定的问题，但它没有。

所以，code是这样：

PopupWindow pw = new PopupWindow(your layout and params here);

((TextView)pw.getContentView().findViewById(R.id.my_textview)).setText("hello there");

pw.showAtLocation(your params here);

我都代码实现：

//PopupWindow具体实现
 dateSectionView = View.inflate(this,R.layout.pop_xxx,null);//布局
//创建PopupWindow
popDateView = new PopupWindow(dateSectionView, AbsListView.LayoutParams.MATCH_PARENT, AbsListView.LayoutParams.MATCH_PARENT, true);
        /******此处重点********/
        tv_StartDate = popDateView.getContentView().findViewById(R.id.tv_startDate);
        tv_EndDate = popDateView.getContentView().findViewById(R.id.tv_endDate);
         /******此处重点********/
        //设置显示日期
        String start = null;
        if (startDate == null){
            start = sale_list_datetime;
        }else {
            start = startDate;
        }
        String end = null;
        if (endDate == null){
            end = sale_list_datetime;
        }else {
            end = endDate;
        }
        tv_StartDate.setText(start);
        tv_EndDate.setText(end);
        tv_StartDate.setOnClickListener(new StartDateClick());
        tv_EndDate.setOnClickListener(new EndDateClick());
        // 在PopupWindow里面就加上下面代码，让键盘弹出时，不会挡住pop窗口。
        popDateView.setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED);
        popDateView.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
        popDateView.setBackgroundDrawable(new BitmapDrawable());
        popDateView.setOutsideTouchable(true);
        if (Build.VERSION.SDK_INT >= 24) {
            Rect visibleFrame = new Rect();
            lin_choosetime.getGlobalVisibleRect(visibleFrame);
            int height = (lin_choosetime.getResources().getDisplayMetrics().heightPixels - visibleFrame.bottom)/5;//高度全屏高度的1/5
            popDateView.setHeight(height);
            popDateView.showAsDropDown(lin_choosetime, 0, 0);
        } else {
            popDateView.showAsDropDown(lin_choosetime, 0, 0);
        }
        popDateView.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));