[android help] How to modify a View from the MainActivity in another class?

I would like update a GridView that I have created in my MainActivity from another class, in my case, called GameplayController.

Specifically, I am trying to simply insert the gridView.setOnItemClickListener(....)... that I currently I have in the MainActivity into a method in the GameplayController class.

I am making a little board game app, and I thought to create a method, "play(), with a loop for the game that runs until the game is over. I started up the GridView in the onCreate of the MainActivity and then I call the method I want the game to run in, but I don't know how to get the GridView I created over to my GameplayController class method "play()" so that I can update it properly directly from there.

Here is the relevant part of my MainActivity:

...
public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState){

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        GridView gridview = (GridView) findViewById(R.id.gridview);
        gridview.setAdapter(new ImageAdapter(this));

        //Create board model, add units to player's list.
        UnitArray gameBoardModel = new UnitArray();

        //Run the game loop until winner found.
        GameplayController.play();

        //This ClickListener I don't want here, I want it in my play() method.
        gridview.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView parent, View v, int postion,
                    long id) {
                // Toast for development help only.
                Toast.makeText(MainActivity.this, "" + postion,
                        Toast.LENGTH_SHORT).show();
            }
        });

    }
...

Here is the relevant part of the class I want to control the GridView in:

public class GameplayController {

    private static boolean gameOver = false;

    /*
     * Will run the game loop.
     */
    public static void play() { 
        while (gameOver == false) {
            /*
             * Update the GridView from Main somehow.
             */


            /*
            * Will be put in correct place later.
            /*
            gameOver = true;
        }
    }
}

This may be totally wrong, but will I need to use a LayoutInflater?

.

stackoverflow.comm