how to call method in activity form non activity class

Question

I have an Activity and non Activity class. How to call a method in Activity class from non Activity class

public class MainActivity extends Activity {
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main2);

        DataClass dc = new DataClass();
        dc.show();                  
    }

    public void call(ArrayList<String> arr) {
       // Some code...
    }
}

---

public class DataClass {

    public void show(ArrayList<String> array) {
        // Here I want to send this ArrayList values into the call
        // method in activity class.

       MainActivity act = new MainActivity();
       act.call(array);                  
    }
}

Answer 1

Well there are several things you could do. I think the easiest for you would be to send the Context into DataClass like so:

DataClass dc =new DataClass();
dc.show(this);

And in your DataClass save the context into a global var Context context. Then use it like so:

((MainActivity)context).call(array);

Answer 2

((MainActivity)getContext).array();