我试图提供一个共同的DataStore<Preferences>这样可以在多个地方使用相同的首选项文件，但我收到了有用的错误消息：

找不到符号：DaggerMyApplication_HiltComponents_SingletonC.builder()

@Module
@InstallIn(ApplicationComponent::class)
object DataStoreModule {
    
    @Provides
    fun provideDataStore(@ApplicationContext context: Context): DataStore<Preferences> = context.createDataStore("settings")
}

但是，我可以执行以下操作并在@Inject构造函数。

@Singleton
class DataStoreProvider @Inject constructor(@ApplicationContext context: Context) {

    val dataStore: DataStore<Preferences> = context.createDataStore("settings")
}

我假设扩展createDataStore正在做希尔特不喜欢的事情，但我希望能解释一下正在发生的事情，即使问题无法解决。

这对我有用：

    @Provides
    @Singleton
    fun dataStore(@ApplicationContext appContext: Context): DataStore<Preferences> =
        appContext.createDataStore("settings")

这个想法是把@Singleton位于提供者方法后面。

2021 年 2 月 9 日更新：
最好创建一个manager https://github.com/Drjacky/MVVMTemplate/blob/master/presentation/src/main/kotlin/app/web/drjackycv/presentation/datastore/DataStoreManager.kt并规定：

class DataStoreManager(appContext: Context) {

    private val settingsDataStore = appContext.createDataStore("settings")

    suspend fun setThemeMode(mode: Int) {
        settingsDataStore.edit { settings ->
            settings[Settings.NIGHT_MODE] = mode
        }
    }

    val themeMode: Flow<Int> = settingsDataStore.data.map { preferences ->
        preferences[Settings.NIGHT_MODE] ?: AppCompatDelegate.MODE_NIGHT_UNSPECIFIED
    }

}

应用程序模块 https://github.com/Drjacky/MVVMTemplate/blob/master/app/src/main/kotlin/app/web/drjackycv/mvvmtemplate/di/module/AppModule.kt:

@InstallIn(SingletonComponent::class)
@Module
class AppModule {
    @Provides
    @Singleton
    fun dataStoreManager(@ApplicationContext appContext: Context): DataStoreManager =
        DataStoreManager(appContext)

2021 年 3 月 20 日更新：
版本1.0.0-alpha07

private val Context.dataStore by preferencesDataStore("settings")

class DataStoreManager(appContext: Context) {

    private val settingsDataStore = appContext.dataStore

    suspend fun setThemeMode(mode: Int) {
        settingsDataStore.edit { settings ->
            settings[Settings.NIGHT_MODE] = mode
        }
    }

    val themeMode: Flow<Int> = settingsDataStore.data.map { preferences ->
        preferences[Settings.NIGHT_MODE] ?: AppCompatDelegate.MODE_NIGHT_UNSPECIFIED
    }
}

2021 年 5 月 1 日更新：

@Florian 完全正确，我忘了这一点。

Remove dataStoreManager来自 DI 模块的提供者。只是：

private val Context.dataStore by preferencesDataStore("settings")

@Singleton //You can ignore this annotation as return `datastore` from `preferencesDataStore` is singletone
class DataStoreManager @Inject constructor(@ApplicationContext appContext: Context) {

    private val settingsDataStore = appContext.dataStore

    suspend fun setThemeMode(mode: Int) {
        settingsDataStore.edit { settings ->
            settings[Settings.NIGHT_MODE] = mode
        }
    }

    val themeMode: Flow<Int> = settingsDataStore.data.map { preferences ->
        preferences[Settings.NIGHT_MODE] ?: AppCompatDelegate.MODE_NIGHT_UNSPECIFIED
    }

}