DataManager.java

@Singleton
public class DataManager {

    private Context mContext;
    private DbHelper mDbHelper;
    private SharedPrefsHelper mSharedPrefsHelper;

    @Inject
    public DataManager(@ApplicationContext Context context,
                       DbHelper dbHelper,
                       SharedPrefsHelper sharedPrefsHelper) {
        mContext = context;
        mDbHelper = dbHelper;
        mSharedPrefsHelper = sharedPrefsHelper;
    }
    ...
}