当我构建此代码时,它显示了构建错误:
DatabaseManager_Impl不是抽象的,不会覆盖抽象 RoomDatabase中的方法clearAllTables()。
的build.gradle:
implementation 'android.arch.persistence.room:runtime:1.0.0'
kapt 'android.arch.persistence.room:compiler:1.0.0'
implementation 'android.arch.persistence.room:rxjava2:1.0.0'
implementation 'android.arch.persistence.room:guava:1.1.0-beta3'
根据房间指南实施数据库:
@Database(entities = {Task.class}, version = 1)
public abstract class DatabaseManager extends RoomDatabase {
private static final String DATABASE =
Iterables.getLast(Splitter.on(".").trimResults().split(BuildConfig.APPLICATION_ID)).concat("-db");
private static volatile DatabaseManager instance;
public abstract TaskDao taskDao();
synchronized public static DatabaseManager onInstance(Context context) {
if (instance == null) {
instance = newInstance(context, false);
}
return instance;
}
public static DatabaseManager newInstance(Context context, boolean memoryOnly) {
RoomDatabase.Builder<DatabaseManager> builder;
if (memoryOnly) {
builder = Room.inMemoryDatabaseBuilder(context.getApplicationContext(), DatabaseManager.class);
} else {
builder = Room.databaseBuilder(context.getApplicationContext(), DatabaseManager.class, DATABASE);
}
return builder.fallbackToDestructiveMigration().build();
}
}
答案 0 :(得分:17)
我有同样的问题,并意识到
//room
implementation "android.arch.persistence.room:runtime:${arch_version}"
kapt "android.arch.persistence.room:compiler:${arch_version}"
implementation "android.arch.persistence.room:rxjava2:${arch_version}"
这些依赖项应该具有相同的版本。它们都是1.0.0或1.1.0。不同的版本会导致问题。
答案 1 :(得分:1)
我的修复方法是将所有会议室版本的版本更改为1.0.0
另请务必使用kapt
代替annotationProccessor
!