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Android Testing in Android Unit Testing Viewing the Presenter

testing in android

Challenge Task 1 of 1

Here's a simple counter app consisting of only a TextView and a Button. When the Button is pressed the counter (TextView) increases by one.

Refactor this to now use a View and Presenter.

public class MainActivity extends AppCompatActivity {
    TextView counter;
    Button button;

    public void onCreate(Bundle savedInstanceState) {

        counter = (TextView) findViewById(R.id.textView);
        button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                int count = Integer.parseInt(counter.getText().toString());
                counter.setText(Integer.toString(count + 1));
public interface MainActivityView {
    void changeTextViewText(String text);
public class MainActivityPresenter {
    MainActivityView view;

    public MainActivityPresenter(MainActivityPresenter view) {
    } // MainActivityPresenter()

    public void buttonClicked(String text) {
    } // editTextUpdated()

1 Answer

Seth Kroger
Seth Kroger
56,413 Points

You still need to implement the MainActivityView interface in MainActivity.