使用下面的gradle链接:

compile 'android.arch.persistence.room:runtime:1.0.0-alpha9'
annotationProcessor 'android.arch.persistence.room:compiler:1.0.0-alpha9'

你需要创建一个不同的单例类，并从那里获取AppDatabase，如下所示:

RoomDB.java

public class RoomDB {

private static RoomDB INSTANCE;

public static AppDatabase getInstance(Context context) {
    if (INSTANCE == null) {
        INSTANCE =
                Room.databaseBuilder(context.getApplicationContext(), AppDatabase.class, Constant.DATABASE).allowMainThreadQueries().build();

                //Room.inMemoryDatabaseBuilder(context.getApplicationContext(),AppDatabase.class).allowMainThreadQueries().build();
    }
    return INSTANCE;
}

public static void destroyInstance() {
    INSTANCE = null;
}

App.java

public class App extends Application {

private boolean appRunning = false;

@Override
public void onCreate() {
    super.onCreate();
    RoomDB.getInstance(this); //This will provide AppDatabase Instance
}

对我来说，只要你包含任何与Room数据库相关的导入，Android Studio就会自动更新依赖项。但根据https://developer.android.com/jetpack/androidx/releases/room#declaring_dependencies，你需要更新一些。下面是我的代码库的样子:

AppDatabase.kt

import android.content.Context
import androidx.room.Database
import androidx.room.Room
import androidx.room.RoomDatabase

@Database(entities = arrayOf(MyEntity::class), version = 1)
abstract class AppDatabase : RoomDatabase() {
    abstract fun myDAO(): MyDAO

    companion object {
        @Volatile private var instance: AppDatabase? = null
        private val LOCK = Any()

        operator fun invoke(context: Context)= instance ?: synchronized(LOCK){
            instance ?: buildDatabase(context).also { instance = it}
        }

        private fun buildDatabase(context: Context) = Room.databaseBuilder(context,
            AppDatabase::class.java, "db-name.db")
            .build()
    }
}

更新构建。Gradle在其中一个答案中指定:

apply plugin: 'kotlin-kapt' // this goes with other declared plugin at top
dependencies { // add/update the following in dependencies section
    implementation 'androidx.room:room-runtime:2.2.3'
//    annotationProcessor 'androidx.room:room-compiler:2.2.3' // remove this and use the following
    kapt "androidx.room:room-compiler:2.2.3"

}

同步gradle，你应该可以开始了。

我遇到了这个问题，因为我忘记了@Dao注释

@Dao
public interface SearchHistoryDao {
    @Query("SELECT * FROM search_history")
    List<SearchHistory> getAll();

    @Insert
    void insertAll(SearchHistory... histories);

    @Delete()
    void delete(SearchHistory history);
}

官方教程

我错过的时候出现了这个错误

@Database(entity="{<model.class>})

确保上面注释中指定的实体模型引用特定的模型类，并确保必要的注释:

@Entity(tableName = "<table_name>" ...)

是正确定义的，你会很好吗

在2023年1月，我在重构我的代码以使用ServiceLocator类后遇到了类似的问题。

为了解决这个问题，我在更衣室里玩了很多次。它适用于2.5.0-alpha02

Version_room = "2.5.0-alpha02" <——build。gradle(项目)

 //Room
implementation "androidx.room:room-runtime:$version_room"
kapt "androidx.room:room-compiler:$version_room"
// optional - Kotlin Extensions and Coroutines support for Room
implementation "androidx.room:room-ktx:$version_room"
implementation("androidx.room:room-guava:$version_room")

我在Android Eel 2020.1.1上运行以下程序:

Version_kotlin = "1.7.21" Version_android_gradle_plugin = "4.0.1"

在OP的情况下不是这样，但是当你错误地使用implementation而不是annotationProcessor时也会发生这种情况，就像这样:

implementation "android.arch.persistence.room:compiler:x.x.x"

而不是这样:

annotationProcessor "android.arch.persistence.room:compiler:x.x.x"