Here's a simple counter app consisting of only a TextView and a Button. When the Button is pressed the counter (TextVie

public class MainActivity extends AppCompatActivity implements MainActivityView {
    TextView counter;
    Button button;
    MainActivityPresenter map;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
      map = new MainActivityPresenter (this);

        counter = (TextView) findViewById(R.id.textView);
        button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int count = Integer.parseInt(counter.getText().toString());
                counter.setText(Integer.toString(count + 1));
            }
        });
    }
}

public interface MainActivityView {
  void buttonPressed(TextView counter);

}

public class MainActivityPresenter {

  private MainActivityView view;

  public MainActivityPresenter(MainActivityView view)  {
    this.view = view;

}
  public void onButtonPressed(TextView counter)  {
    view.buttonPressed(counter);
  }
}