activity_main.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.antonioleiva.mvpexample.app.main.MainActivity">

    <ListView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:clipToPadding="false"
        android:scrollbarStyle="outsideOverlay"
        />

    <ProgressBar
        android:id="@+id/progress"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:visibility="gone"
        />

</FrameLayout>

FindItemsInteractor.java

public interface FindItemsInteractor {

    public void findItems(OnFinishedListener listener);

}

FindItemsInteractorImpl.java

public class FindItemsInteractorImpl implements FindItemsInteractor {
    @Override public void findItems(final OnFinishedListener listener) {
        new Handler().postDelayed(new Runnable() {
            @Override public void run() {
                listener.onFinished(createArrayList());
            }
        }, 2000);
    }

    private List<String> createArrayList() {
        return Arrays.asList(
                "Item 1",
                "Item 2",
                "Item 3",
                "Item 4",
                "Item 5",
                "Item 6",
                "Item 7",
                "Item 8",
                "Item 9",
                "Item 10"
        );
    }
}

MainActivity.java

public class MainActivity extends Activity implements MainView, AdapterView.OnItemClickListener {

    private ListView listView;
    private ProgressBar progressBar;
    private MainPresenter presenter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = (ListView) findViewById(R.id.list);
        listView.setOnItemClickListener(this);
        progressBar = (ProgressBar) findViewById(R.id.progress);
        presenter = new MainPresenterImpl(this);

    }

    @Override protected void onResume() {
        super.onResume();
        presenter.onResume();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override public void showProgress() {
        progressBar.setVisibility(View.VISIBLE);
        listView.setVisibility(View.INVISIBLE);
    }

    @Override public void hideProgress() {
        progressBar.setVisibility(View.INVISIBLE);
        listView.setVisibility(View.VISIBLE);
    }

    @Override public void setItems(List<String> items) {
        listView.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, items));
    }

    @Override public void showMessage(String message) {
        Toast.makeText(this, message, Toast.LENGTH_LONG).show();
    }

    @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        presenter.onItemClicked(position);
    }
}

MainPresenter.java

public interface MainPresenter {

    public void onResume();

    public void onItemClicked(int position);
}

MainPresenterImpl.java

public class MainPresenterImpl implements MainPresenter, OnFinishedListener {

    private MainView mainView;
    private FindItemsInteractor findItemsInteractor;

    public MainPresenterImpl(MainView mainView) {
        this.mainView = mainView;
        findItemsInteractor = new FindItemsInteractorImpl();
    }

    @Override public void onResume() {
        mainView.showProgress();
        findItemsInteractor.findItems(this);
    }

    @Override public void onItemClicked(int position) {
        mainView.showMessage(String.format("Position %d clicked", position + 1));
    }

    @Override public void onFinished(List<String> items) {
        mainView.setItems(items);
        mainView.hideProgress();


    }
}

MainView.java

public interface MainView {

    public void showProgress();

    public void hideProgress();

    public void setItems(List<String> items);

    public void showMessage(String message);
}

OnFinishedListener.java

public interface OnFinishedListener {

    void onFinished(List<String> items);
}