Question

I’m trying to switch the content of an activity using the setContentView in a similar manner:

    @Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

if (condition) {

  setContentView(R.layout.layout1);

} else {

  setContentView(R.layout.layout2);
}

...
}

In the folders:
layout1.xml
layout2.xml

It works but if after setConentView I want to reference a control in the layout2..like a TextView, using FindViewById ..I get an error and the program crashes.
What’s the problem. ?

Answer 1

If you want to reference a View from one of your layouts in an Activity, you need to:

1. Make sure that it exists in the given layout
2. Make sure that the given layout is set using the setContentView() method.