Simple example of Dagger in Android

gistfile1.java

public class MyApp extends Application {
  private ObjectGraph objectGraph;
  
  public void onCreate() {
    super.onCreate();
    
    objectGraph = ObjectGraph.create(new AppModule(this));
  }
  
  public static void inject(Context context, Object toInject) {
    MyApp app = (MyApp)context.getApplicationContext();
    app.objectGraph.inject(toInject);
  }
  
  public static void inject(Context context) {
    inject(context, context);
  }
}

@Module(
  injects = {
    FooActivity.class
  }
)
public class AppModule {
  private Context context;

  public AppModule(Context context) {
    this.context = context;
  }

  @Singleton @Provides
  GSHTTPClient provideGSHTTPClient() {
    return new GSHTTPClient(context);
  }
}

public class FooActivity extends Activity {
  @Inject
  GSHTTPLib httpLib;
  
  public void onCreate() {
    super.onCreate();
    
    MyApp.inject(this)
  }
}