下面是一个使用Android MVVM架构和Dagger 2库来注入ViewModelFactory的示例代码：

首先，创建一个ViewModelFactory类，它负责创建ViewModel对象：

public class ViewModelFactory implements ViewModelProvider.Factory {

    private final Map, Provider> creators;

    @Inject
    public ViewModelFactory(Map, Provider> creators) {
        this.creators = creators;
    }

    @NonNull
    @Override
    public  T create(@NonNull Class modelClass) {
        Provider creator = creators.get(modelClass);
        if (creator == null) {
            for (Map.Entry, Provider> entry : creators.entrySet()) {
                if (modelClass.isAssignableFrom(entry.getKey())) {
                    creator = entry.getValue();
                    break;
                }
            }
        }
        if (creator == null) {
            throw new IllegalArgumentException("Unknown ViewModel class: " + modelClass);
        }
        try {
            return (T) creator.get();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}

接下来，在Application类中创建Dagger的Component和Module：

public class MyApplication extends Application {

    private AppComponent component;

    @Override
    public void onCreate() {
        super.onCreate();

        component = DaggerAppComponent.builder()
                .appModule(new AppModule(this))
                .build();
    }

    public AppComponent getAppComponent() {
        return component;
    }
}

@Module
public class AppModule {

    private final Application application;

    public AppModule(Application application) {
        this.application = application;
    }

    @Provides
    @Singleton
    Application provideApplication() {
        return application;
    }

    @Provides
    @Singleton
    ViewModelProvider.Factory provideViewModelFactory(ViewModelFactory factory) {
        return factory;
    }
}

然后，创建一个AppComponent接口和一个具体的实现类：

@Singleton
@Component(modules = {AppModule.class})
public interface AppComponent {

    void inject(MainActivity activity);
}

public class DaggerAppComponent implements AppComponent {

    private final AppModule appModule;

    private DaggerAppComponent(AppModule appModule) {
        this.appModule = appModule;
    }

    public static AppComponent.Builder builder() {
        return new Builder();
    }

    @Override
    public void inject(MainActivity activity) {
        activity.viewModelFactory = appModule.provideViewModelFactory(new ViewModelFactory(Collections.emptyMap()));
    }

    private static class Builder implements AppComponent.Builder {

        private AppModule appModule;

        @Override
        public AppComponent.Builder appModule(AppModule appModule) {
            this.appModule = appModule;
            return this;
        }

        @Override
        public AppComponent build() {
            return new DaggerAppComponent(appModule);
        }
    }
}

最后，在Activity或Fragment中使用注入的ViewModelFactory：

public class MainActivity extends AppCompatActivity {

    @Inject
    ViewModelProvider.Factory viewModelFactory;

    private MainViewModel viewModel;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // 注入ViewModelFactory
        ((MyApplication) getApplication()).getAppComponent().inject(this);

        // 使用ViewModelFactory创建ViewModel对象
        viewModel = ViewModelProviders.of(this, viewModelFactory).get(MainViewModel.class);

        // 使用ViewModel对象进行其他操作
    }
}

以上是一个简单的Android MVVM Dagger 2示例，其中ViewModelFactory通过Dagger 2库进行注入，并在Activity中使用了注入的ViewModelFactory来创建ViewModel对象。