public interface MvpView {
}

public abstract class BaseActivity<T extends MvpView, K extends Presenter<T>> extends AppCompatActivity {

    private K presenter;

    protected abstract @NonNull T getView();
    protected abstract void inject();

    @CallSuper
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        inject();

        presenter.attach(getView());
    }

    @CallSuper
    @Override
    public void onDestroy () {

        presenter.detach(getView());

        super.onDestroy();
    }

    //presenter

    public K getPresenter () {
        return presenter;
    }

    @Inject
    public void setPresenter (K presenter) {
        this.presenter = presenter;
    }
}

public abstract class Presenter<T extends MvpView> {

    protected T view;

    public void attach (T view) {
        this.view = view;
    }

    public void detach (T view) {
        if (this.view == view) {
            this.view = null;
        }
    }
}

public class MainActivity extends BaseActivity<MainPresenter.View, MainPresenter> implements MainPresenter.View, View.OnClickListener {

    @NonNull
    @Override
    protected MainPresenter.View getView() {
        return this;
    }

    @Override
    protected void inject() {
        DaggerMainComponent
                .builder()
                .build()
                .inject(this);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        findViewById(R.id.do_smth_btn).setOnClickListener(this);
    }

    //View.OnClickListener

    @Override
    public void onClick(View v) {

        switch (v.getId()) {

            case R.id.do_smth_btn: {

                getPresenter().doSmth();

                break;
            }
        }
    }

    @Override
    public void onSmthDone(String string) {

        Toast.makeText(this, "result - " + string, Toast.LENGTH_LONG).show();
    }
}

@Singleton
public class MainPresenter extends Presenter<MainPresenter.View> {

    @Inject
    public MainPresenter () {

    }

    public void doSmth() {
        view.onSmthDone("done");
    }

    public interface View extends MvpView {
        void onSmthDone(String string);
    }
}