Question

How can I edit a button from another Activity?

It returns me an

java.lang.IllegalStateException: Could not execute method of the activity
Caused by: java.lang.NullPointerException

When I want to

getButton.setEnabled(false);

where

Button getButton = (Button)findViewById(R.id.buttonGet);

Answer 1

Make sure you have called setContentView before you get a reference to your button, i.e do this:

setContentView(R.layout.my_activity_layout);

before this:

Button getButton = (Button)findViewById(R.id.buttonGet);