How to test this.

MyActivity.java

public class MyActivity extends AppCompatActivity {
  
  private MyController controller;
  private Button continueButton
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    
    controller = new MyController();
    continueButton = (Button) findViewById(R.id.continueButton);
    continueButton.setEnabled(true);
    
    controller.initDisplayViews(this, continueButton);
    
  }
}

MyController.java

public class MyController {

  private Button continueButton;
  
  public void initDisplayViews(MyActivity activity, Button continueButton) {
    this.continueButton = continueButton;
    this.continueButton.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            didEnterInstance();
        }
    });
  }
  
  private void didEnterInstance() {
    displayProgressDialog()
    makeApiCall(data, new ResponseCallback() {
      public void onResponse(Response response) {
        startActivity();
      }
    });
  }
}