Ufdjrw

My field for retrofit in this class is never injected into, it is still null when i run my code.

Here is my ServiceClass where I inject retrofit, have my api calls etc. I stripped it down for simplicity:

public class ServiceClass

 @Inject
 Retrofit retrofit;

 public ServiceClass()
 

My module class for all network related dependencies:

@Module
public class NetworkModule 

 @Provides
 @ApplicationScope
 Retrofit getRetrofit(OkHttpClient okHttpClient, Gson gson)
 return new Retrofit.Builder()
 .baseUrl(URL.BASE_URL)
 .client(okHttpClient)
 .addConverterFactory(GsonConverterFactory.create(gson))
 .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
 .build();
 

 @Provides
 @ApplicationScope
 OkHttpClient getOkHttpClient(Gson gson, HttpLoggingInterceptor httpLoggingInterceptor)
 OkHttpClient okHttpClient = new OkHttpClient();
 okHttpClient.newBuilder().addInterceptor(httpLoggingInterceptor);
 return okHttpClient;
 

 @Provides
 @ApplicationScope
 HttpLoggingInterceptor getHttpLoggingInterceptor()
 return new HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BASIC);
 

 @Provides
 @ApplicationScope
 Gson getGson()
 return new Gson();
 

My AppComponent this is my only component class:

@ApplicationScope
@Component(modules = NetworkModule.class)
public interface AppComponent 

 @Component.Builder
 interface Builder 
 @BindsInstance
 Builder application(MyApplication myApplication);
 AppComponent build();
 

 void inject(MyApplication myApplication);

 Retrofit getRetrofit();

My Application class:

public class MyApplication extends Application

 private AppComponent appComponent;

 @Override
 public void onCreate() 
 super.onCreate();
 DaggerAppComponent
 .builder()
 .application(this)
 .build()
 .inject(this);
 

 public AppComponent getAppComponent()
 return appComponent;
 

I tried to fiddle around the code, I don't seem to manage to get it working properly. What am I missing here?

Update (previous information still valid) :

I have noticed you incorrectly build your component: you must add .networkModule(new NetworkModule()) after DaggerAppComponent.builder()
Make sure your private AppComponent appComponent is initialized too!

For field injection (I believe that's what you're after), you can write your constructor like this:

public ServiceClass()
 MyApplication.getInstance().getAppComponent().inject(this)

Naturally, you should expose your appComponent entity somehow - the above is my guess (to expose appComponent entity via application entity).

PS.: better approach (and more readable too) is to avoid field injection at all and parametrize constructor (however it's not always possible, like for example if you inject into activity).

PSS.: your AppComponent should also have void inject(ServiceClass value);

There are multiple ways of injecting retrofit in ServiceClass

1. 
   

   You have to make a separate Component for ServiceClass like :-

   
   
   

   @Component(dependencies = AppComponent.class)
   interface ServiceClassComponent 
    void injectServiceClass(ServiceClass serviceClass);
   
   

   
   

Or

2. 
   

   you can just inject ServiceClass into your application component:-

   
   
   

   void injectServiceClass(ServiceClass serviceClass);
   

   
   

into your AppComponent

The dependencies keyword would include all the dependent components into your particular component that you would build.

Then in the constructor of ServiceClass you need to build the Component and inject it