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// First, we define a structure to store contact data we want to retrieve
data class ContactData(
    val contactId: Long,
    val name: String,
    val phoneNumber: List<String>,
    val avatar: Uri?
)
  
// Here are the functions to retrieve all contacts matching the search pattern 
fun Context.retrieveAllContacts(

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/**
 * Logs lifecycle events and provides subclasses a method to bind the views, bindViews().
 * 
 * Note that the bindViews() uses Butterknife to bind the views. However, the views
 * can also be bound without using Butterknife. Using Butterknife or not
 * plays no part in this demonstration.
 */
// BaseFragment.java
public abstract class BaseFragment extends Fragment {

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public interface Example1View extends MVPView {
    void showSomething(String something);
}

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@Module
public abstract class Example1PresenterModule {
    @Binds
    @PerFragment
    abstract Example1Presenter example1Presenter(Example1PresenterImpl example1PresenterImpl);
}

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@PerFragment
final class Example1PresenterImpl extends BasePresenter<Example1View> implements Example1Presenter {

    private final SingletonUtil singletonUtil;
    private final PerActivityUtil perActivityUtil;
    private final PerFragmentUtil perFragmentUtil;

    @Inject
    Example1PresenterImpl(Example1View view, SingletonUtil singletonUtil,
                          PerActivityUtil perActivityUtil, PerFragmentUtil perFragmentUtil) {

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public interface Example1Presenter extends Presenter {
    void onDoSomething();
}

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@Singleton
public final class Navigator {

    @Inject
    Navigator() {
    }

    public void toExample1(Context context) {
        Intent intent = new Intent(context, Example1Activity.class);
        context.startActivity(intent);

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public abstract class BaseViewFragment<T extends Presenter> extends BaseFragment
        implements MVPView {

    @Inject
    protected T presenter;

    @Override
    public void onViewStateRestored(Bundle savedInstanceState) {
        super.onViewStateRestored(savedInstanceState);
        // Only start the presenter when the views have been bound.

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public abstract class BasePresenter<T extends MVPView> implements Presenter {

    protected final T view;

    protected BasePresenter(T view) {
        this.view = view;
    }

    @Override
    public void onStart(@Nullable Bundle savedInstanceState) {

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public interface Presenter {

    /**
     * Starts the presentation. This should be called in the view's (Activity or Fragment)
     * onCreate() or onViewStatedRestored() method respectively.
     *
     * @param savedInstanceState the saved instance state that contains state saved in
     *                           {@link #onSaveInstanceState(Bundle)}
     */
    void onStart(@Nullable Bundle savedInstanceState);