Question

I want to set the button width during run time and I want it to be equal to 50% of the display width.
I used the following but I have a problem “nothing appears in emulator” and says
“Process stopped unexpectedly. Please try again”
.java
public class experiment extends Activity{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        Display display = getWindowManager().getDefaultDisplay(); 
        int width = display.getWidth();
        int height = display.getHeight();
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        Button btn = (Button) findViewById(R.id.btnmarwa);
        btn.setWidth(width/2);      
        setContentView(R.layout.emailpopup);
    }
}

When I commented this line
btn.setWidth(width);
There is no errors and the layout appears, So where to set the new width to the button in .java file??

Answer 1

Is not directly about your question, but you have to put this lines After setContentView() ’cause the findViewById method.

Like try this :

// TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.emailpopup);
    Button btn = (Button) findViewById(R.id.btnmarwa);
    btn.setWidth(width/2);