How do you update the screen after you change the text with a setText?

问题

Right now I am using the following code to update a TextView

txtMain.setText("new text");

After that code executes, the screen does not update with the new text. Is there a way I can force the text to update right then and there?

回答1:

After that code executes, the screen does not update with the new text

It should, once you return control to Android.

Suppose, for example, you tried doing a Thread.sleep(5000); immediately after the setText() call. The text will not appear on the screen, because Android's main application thread is tied up sleeping and cannot redraw the screen.

So, make sure that you return from whatever callback you are in (onCreate(), onClick(), onListItemClick(), etc.), and Android should update the screen momentarily.

来源：https://stackoverflow.com/questions/3695993/how-do-you-update-the-screen-after-you-change-the-text-with-a-settext