Dependency injection

injection.java

public class BaseActivity extends AppCompatActivity {
    @Inject SharedPreferences prefs;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ((DaggerApplication)getApplication()).getAppComponent().inject(this);

    }
}
...................

@Singleton @Component(modules = AppModule.class)
public interface AppComponent {
    void inject(DaggerApplication daggerApplication);
    void inject(BaseActivity baseActivity);
}
...................

@Module public class AppModule {
    private final DaggerApplication application;

    public AppModule(DaggerApplication application) {
        this.application = application;
    }
    @Provides @Singleton
    Context providesApplicationContext(){
        return application;
    }
    @Provides @Singleton
    SharedPreferences providesSharedPreferences(Context context){
        return context.getSharedPreferences("My_Prefs_Title",Context.MODE_PRIVATE);
    }

}

...................

public class DaggerApplication extends Application {
 private AppComponent appComponent;
    @Override
    public void onCreate() {
        super.onCreate();
        appComponent=DaggerAppComponent.builder().appModule(new AppModule(this)).build();
        appComponent.inject(this);
    }

    public AppComponent getAppComponent() {
        return appComponent;
    }
}