Question

I have a main activity with TextViews and class that want’s modify the main activity’s TextViews.

I keep generating NullPointerException errors in my findViewbyID method in my class. I’m assuming because I’m not passing the View to the class method. How do I got about doing this?

Answer 1

you will need to to pass Activity instance to your non Activity class using constructor to access all UI elements from non Activity Class as :

public class NonActivity{
Activity activity;
Context context;

public NonActivity(Activity activity,Context context) {
  this.activity=activity;
  this.context=context;
 }

}

now you can access UI elements from Activity in NonActivity class as:

 TextView textview=(TextView)activity.findViewbyID(R.id.textview);