Dagger Part 1 Examples

ApplicationComponent.java

@Singleton
@Component(modules = { ApplicationModule.class, ApiModule.class })
public interface ApplicationComponent {
    void inject(TaskoApplication target);
    void inject(MainActivity target);
}

ApplicationModule.java

@Module
public class ApplicationModule {

    private Application application;

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

    @Provides @Singleton
    public Context provideContext() {
        return application;
    }

    @Provides @Singleton
    public SharedPreferences provideSharedPreferences(Context context) {
        return PreferenceManager.getDefaultSharedPreferences(context);
    }
}

MainActivity.java

public class MainActivity extends AppCompatActivity {

    @Inject SharedPreferences prefs;

    private FloatingActionButton fab;

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

        ((TaskoApplication)getApplication()).getComponent().inject(this);
        if(prefs != null) {
            Log.d("Dagger2", "Prefs is not null");
        }
        //.. rest of it left out for brevity ...
    }
}

TaskoApplication.java

public abstract class TaskoApplication extends Application {

    private ApplicationComponent component;

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

        component = DaggerApplicationComponent.builder()
                            .applicationModule(new ApplicationModule(this))
                            .build();

        // Configure Realm for the application
        RealmConfiguration realmConfiguration = new RealmConfiguration.Builder(this)
                .name("tasko.realm")
                .build();
        Realm.deleteRealm(realmConfiguration); // Clean slate
        Realm.setDefaultConfiguration(realmConfiguration); // Make this Realm the default

    }

    public ApplicationComponent getComponent() {
        return component;
    }
}