[英]I can't inject Dao to a Repository Class, with HILT, in Android
[英]Can't inject Room dao using Hilt, Android
我正在尝试使用 Hilt 将 Room DAO 注入到存储库中。 我正在使用以下代码:
def room_version = "2.2.6"
ext.hilt_version = '2.33-beta'
implementation "androidx.room:room-runtime:$room_version"
kapt "androidx.room:room-compiler:$room_version"
implementation "androidx.room:room-ktx:$room_version"
implementation "androidx.room:room-guava:$room_version"
testImplementation "androidx.room:room-testing:$room_version"
implementation "com.google.dagger:hilt-android:$hilt_version"
kapt "com.google.dagger:hilt-compiler:$hilt_version"
道
@Dao
interface SearchDAO {
@Query("SELECT * FROM searches_table WHERE name LIKE '%' || :query || '%'")
fun readSearches(query : String) : Flow<List<SearchItem>>
@Insert(onConflict = OnConflictStrategy.REPLACE)
suspend fun insertSearch(search : SearchItem)
@Delete
suspend fun deleteSearch(search: SearchItem)
}
数据库
@Database(
entities = [SearchItem::class],
version = 1
)
abstract class SearchesDatabase : RoomDatabase(){
abstract fun getSearchesDao() : SearchDAO
}
提供者
@Module
@InstallIn(ActivityComponent::class)
object AppModule{
@Singleton
@Provides
fun provideSearchDatabase(@ApplicationContext context : Context) =
Room.databaseBuilder(context, SearchesDatabase::class.java, SEARCH_DATABASE_NAME)
.fallbackToDestructiveMigration()
.build()
@Provides
fun provideSearchDAO(appDatabase: SearchesDatabase): SearchDAO {
return appDatabase.getSearchesDao()
}
}
基础应用
@HiltAndroidApp
class BaseApplication : Application() {
override fun onCreate() {
super.onCreate()
//Timber.plant(Timber.DebugTree())
}
}
存储库注入
class Repository @Inject constructor(
val searchesDao : SearchDAO
){
...
}
问题是我收到以下错误:
[Dagger/MissingBinding] com.example.leagueapp.database.SearchDAO 不能在没有@Provides-annotated 方法的情况下提供。 公共抽象 static class SingletonC 实现 BaseApplication_GeneratedInjector
简短的回答:任何@Singleton 都必须安装在 SingletonComponent 中。
说明:单身人士的目的是为了他们所处的过程的生命。您的数据库是 singleton(可能应该是)但是您正在使用@InstallIn(ActivityComponent::class)
告诉 dagger provide
的所有内容本模块中的范围应限于活动的生命周期; 当活动死亡时,模块死亡。
请在您的应用模块 class 中编写以下代码。 你只需要在 @installIn() 注释中写 SingletonComponent::class 而不是 ActivityComponent::class :)
@Module
@InstallIn(SingletonComponent::class)
object AppModule{
@Singleton
@Provides
fun provideSearchDatabase(@ApplicationContext context : Context) =
Room.databaseBuilder(context, SearchesDatabase::class.java, SEARCH_DATABASE_NAME)
.fallbackToDestructiveMigration()
.build()
@Provides
fun provideSearchDAO(appDatabase: SearchesDatabase): SearchDAO {
return appDatabase.getSearchesDao()
}
}
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