安卓的setText（）用于TextView的在PopupWindow不工作 [英] Android: setText() for TextView in PopupWindow not working

问题描述

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。

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.

我可以设置从布局XML精细的文本。

I can set text from the layout xml fine.

任何人都知道什么是这个吗？谢谢 -

Anyone know what's up with this? Thanks-

推荐答案

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。

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.

所以，code是这样：

So the code goes something like:

PopupWindow PW =新PopupWindow（你的布局，而params这里）;

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

（（TextView中）pw.getContentView（）findViewById（R.id.my_textview）。）的setText（你好有）;

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

pw.showAtLocation（您PARAMS这里）;

pw.showAtLocation(your params here);

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