Android系统.无法实例化工人

概述我想从assets文件夹中的json文件预先填充我的Room数据库.我遵循 Google Sunflower sample.我复制了SeedDatabaseWorker类： import android.content.Contextimport android.util.Logimport androidx.work.Workerimport androidx.work.WorkerPar 我想从assets文件夹中的Json文件预先填充我的Room数据库.我遵循 Google Sunflower sample.我复制了SeedDatabaseWorker类：

import androID.content.Contextimport androID.util.Logimport androIDx.work.Workerimport androIDx.work.WorkerParametersimport com.dmitrysimakov.gymlab.data.GymLabDbimport com.dmitrysimakov.gymlab.data.entity.Trainingimport com.Google.gson.Gsonimport com.Google.gson.reflect.Typetokenimport com.Google.gson.stream.JsonReaderimport javax.inject.Injectclass SeedDatabaseWorker(val context: Context,workerParams: WorkerParameters) : Worker(context,workerParams) {    private val TAG = SeedDatabaseWorker::class.java.simplename    @Inject lateinit var database: GymLabDb    overrIDe fun doWork(): Worker.Result {        val plantType = object : Typetoken<List<Training>>() {}.type        var JsonReader: JsonReader? = null        return try {            val @R_403_5983@Stream = context.assets.open("training.Json")            JsonReader = JsonReader(@R_403_5983@Stream.reader())            val plantList: List<Training> = Gson().fromJson(JsonReader,plantType)            database.trainingDao().insert(plantList)            Worker.Result.SUCCESS        } catch (ex: Exception) {            Log.e(TAG,"Error seeding database",ex)            Worker.Result.FAILURE        } finally {            JsonReader?.close()        }    }}

我正在使用Dagger 2,所以不要这样做：Sunflower AppDatabase,我这样做：

import androID.arch.persistence.db.SupportsqliteDatabaseimport androID.arch.persistence.room.Roomimport androID.arch.persistence.room.RoomDatabaseimport androIDx.work.OneTimeWorkRequestBuilderimport androIDx.work.WorkManagerimport com.dmitrysimakov.gymlab.GymLabAppimport com.dmitrysimakov.gymlab.data.GymLabDbimport com.dmitrysimakov.gymlab.workers.SeedDatabaseWorkerimport dagger.Moduleimport dagger.ProvIDesimport javax.inject.Singleton@Module(includes = [viewmodelModule::class])class AppModule {    @Singleton    @ProvIDes    fun provIDeDb(app: GymLabApp): GymLabDb {        return Room                .databaseBuilder(app,GymLabDb::class.java,"gymlab.db")                .addCallback(object : RoomDatabase.Callback() {                    overrIDe fun onCreate(db: SupportsqliteDatabase) {                        super.onCreate(db)                        val request = OneTimeWorkRequestBuilder<SeedDatabaseWorker>().build()                        WorkManager.getInstance().enqueue(request)                    }                })                .fallbackToDestructiveMigration()                .build()    }    @Singleton    @ProvIDes    fun provIDeTrainingDao(db: GymLabDb) = db.trainingDao()}

但我无法注入尚未创建的数据库.那么,我该如何访问dao？

解决方法 问题是我无法将我的数据库注入到Worker中.我在这里找到了解决方案： AndroidWorkerInjection 总结

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