Question

I’m trying to prepare a view to be shown by update the text in the textview before I ever switch over to that view.

I’ve declared the textview variable as public, initialized it in the OnCreate

 Info = (TextView) findViewById(R.id.BackDialogText);

And then when it comes time to change the text, I get a nullpointerException

Info.setText(TheString);
setContentView(R.layout.mydialog_layout);

I’ve run the app without the setText and it runs fine, showing me my view with the predefined text. Is there some trick I’m missing to update the text of the view?

Answer 1

Basically before you set the view

 setContentView(R.layout.mydialog_layout);

to your activity you cannot use the elements inside the view in your code. So you must have something like this in your code

setContentView(R.layout.mydialog_layout);
 Info = (TextView) findViewById(R.id.BackDialogText); // you cannot initialize your view before  setcontentview
 Info.setText(TheString);  //this line must be always called after setContentView