Calling a method from another class is causing app to crash

Question

I decided to try and make my code more object oriented and avoid repetitive code in another class.

Source code for Activities :

Answer 1

Try This:

Make one Class Utils:

In Utils:

public class Utils{
private Activity context;
Button button;
public Utils(Activity context) {
    this.context=context;

}

public void inititializeButton(Activity context){
    button[0]= (Button) context.findViewById(R.id.button_flasher);
}

}

And in your Class use:

 public class EasyMode extends MainActivity {

        Utils utils;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.game_layout_pvp);
            utils=new Utils(this);
            utils.initializeButtons();
        }
    }