Hi, Any ideas on how to make this work? I need to observe the API URL change from shared preferences...

# dagger

[Sergio C.]

Hi, Any ideas on how to make this work?
I need to observe the API URL change from shared preferences in the APIModule but Hilt doesn't like the idea of injecting constructor here...
Modules that need to be instantiated by Hilt must have a visible, empty constructor.

@Module
@InstallIn(SingletonComponent::class)
class ApiModule @Inject constructor(
    localPrefs: SharedPreferences,
    app: Application,
) {

    init {
        localPrefs.registerOnSharedPreferenceChangeListener { prefs: SharedPreferences?, key: String? ->
            if (key == app.getString(R.string.pref_key_api_url)) {
                val newApiUrl = prefs?.getString(key, defaultApiUrl) ?: defaultApiUrl
                Logger.w("API URL CHANGED!!! $newApiUrl")
            }
        }
    }

}

[streetsofboston]

Would field injection work (instead of constructor injection)?

[Sergio C.]

It didn't work either. lateinit var localPrefs is not initialized.

[streetsofboston]

They won't be initialized at the time that init { .... } is called; they'll be initialized a bit later.
You may need to create a (lazy) accessor or create a method you'd need to call explicitly to do what happens originally in your init block...

[Sergio C.]

yes I need to do some experiments

[Sergio C.]

Better sleep over the problem for now... 😴