当我使用1.0.0-alpha5版本的Room Persistence Library时，一切正常。但是，在更新到1.0.0-alpha9版本后，我收到此错误：
java.lang.IllegalStateException：尝试重新打开已经关闭的 object：SQLiteDatabase：/ data / data / package_name / databases / app_db
我该如何解决这个问题？
修改
我正在使用带有匕首2的MVP架构。我有DatabaseHelper类初始化RoomDatabase：
@Singleton
public class DatabaseHelper {
private final AppDatabase appDatabase;
@Inject
public DatabaseHelper(@ApplicationContext Context context) {
appDatabase = Room.databaseBuilder(context, AppDatabase.class, "app_db").build();
}
public List<DifficultyEntity> getAllDifficulties() {
return appDatabase.difficultyDao().getAllDifficulties();
}
我的会议室数据库：
@Database(version = 22, entities = {
DifficultyEntity.class, // ....
})
@Singleton
public abstract class AppDatabase extends RoomDatabase {
public abstract DifficultyDao difficultyDao();
//....
}
当我调用getAllDifficulties方法时，我收到了该错误。
这里是logcat：
java.lang.IllegalStateException: attempt to re-open an already-closed object: SQLiteDatabase: /data/data/package_name/databases/app_db
at android.database.sqlite.SQLiteClosable.acquireReference(SQLiteClosable.java:55)
at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1783)
at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1729)
at android.arch.persistence.db.framework.FrameworkSQLiteDatabase.execSQL(FrameworkSQLiteDatabase.java:241)
at android.arch.persistence.room.RoomOpenHelper.createMasterTableIfNotExists(RoomOpenHelper.java:130)
at android.arch.persistence.room.RoomOpenHelper.checkIdentity(RoomOpenHelper.java:106)
at android.arch.persistence.room.RoomOpenHelper.onOpen(RoomOpenHelper.java:99)
at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper$1.onOpen(FrameworkSQLiteOpenHelper.java:64)
at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:266)
at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:163)
at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper$OpenHelper.getWritableSupportDatabase(FrameworkSQLiteOpenHelper.java:106)
at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper.getWritableDatabase(FrameworkSQLiteOpenHelper.java:82)
at android.arch.persistence.room.RoomDatabase.query(RoomDatabase.java:191)
at uz.iumarov.ieltsspeaking.data.local.database.daos.RecordingDao_Impl.getAllRecordings(RecordingDao_Impl.java:167)
at uz.iumarov.ieltsspeaking.data.local.database.DatabaseHelper.getAllRecording(DatabaseHelper.java:361)
at uz.iumarov.ieltsspeaking.ui.main.recordingsFragment.RecordingsPresenter$1.call(RecordingsPresenter.java:77)
at uz.iumarov.ieltsspeaking.ui.main.recordingsFragment.RecordingsPresenter$1.call(RecordingsPresenter.java:74)
at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:46)
at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.Observable.unsafeSubscribe(Observable.java:10151)
at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:48)
at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:33)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.Observable.unsafeSubscribe(Observable.java:10151)
at rx.internal.operators.OperatorSubscribeOn$1.call(OperatorSubscribeOn.java:94)
at rx.internal.schedulers.EventLoopsScheduler$EventLoopWorker$1.call(EventLoopsScheduler.java:172)
at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:152)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:265)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
编辑2：
过了一段时间，我开始得到不同的错误：
java.lang.IllegalStateException: Room cannot verify the data integrity. Looks like you've changed schema but forgot to update the version number. You can simply fix this by increasing the version number.
at android.arch.persistence.room.RoomOpenHelper.checkIdentity(RoomOpenHelper.java:118)
at android.arch.persistence.room.RoomOpenHelper.onOpen(RoomOpenHelper.java:99)
at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper$1.onOpen(FrameworkSQLiteOpenHelper.java:64)
at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:266)
at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:163)
at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper$OpenHelper.getWritableSupportDatabase(FrameworkSQLiteOpenHelper.java:106)
at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper.getWritableDatabase(FrameworkSQLiteOpenHelper.java:82)
at android.arch.persistence.room.RoomDatabase.query(RoomDatabase.java:191)
at uz.iumarov.ieltsspeaking.data.local.database.daos.RecordingDao_Impl.getAllRecordings(RecordingDao_Impl.java:167)
at uz.iumarov.ieltsspeaking.data.local.database.DatabaseHelper.getAllRecording(DatabaseHelper.java:361)
at uz.iumarov.ieltsspeaking.ui.main.recordingsFragment.RecordingsPresenter$1.call(RecordingsPresenter.java:77)
at uz.iumarov.ieltsspeaking.ui.main.recordingsFragment.RecordingsPresenter$1.call(RecordingsPresenter.java:74)
at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:46)
at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.Observable.unsafeSubscribe(Observable.java:10151)
at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:48)
at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:33)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.Observable.unsafeSubscribe(Observable.java:10151)
at rx.internal.operators.OperatorSubscribeOn$1.call(OperatorSubscribeOn.java:94)
at rx.internal.schedulers.EventLoopsScheduler$EventLoopWorker$1.call(EventLoopsScheduler.java:172)
at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:152)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:265)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
当我更新版本号时，我收到了迁移错误：
java.lang.IllegalStateException: A migration from 22 to 23 is necessary. Please provide a Migration in the builder or call fallbackToDestructiveMigration in the builder in which case Room will re-create all of the tables.
at android.arch.persistence.room.RoomOpenHelper.onUpgrade(RoomOpenHelper.java:81)
at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper$1.onUpgrade(FrameworkSQLiteOpenHelper.java:49)
at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:256)
at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:163)
at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper$OpenHelper.getWritableSupportDatabase(FrameworkSQLiteOpenHelper.java:106)
at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper.getWritableDatabase(FrameworkSQLiteOpenHelper.java:82)
at android.arch.persistence.room.RoomDatabase.query(RoomDatabase.java:191)
at uz.iumarov.ieltsspeaking.data.local.database.daos.RecordingDao_Impl.getAllRecordings(RecordingDao_Impl.java:167)
at uz.iumarov.ieltsspeaking.data.local.database.DatabaseHelper.getAllRecording(DatabaseHelper.java:361)
at uz.iumarov.ieltsspeaking.ui.main.recordingsFragment.RecordingsPresenter$1.call(RecordingsPresenter.java:77)
at uz.iumarov.ieltsspeaking.ui.main.recordingsFragment.RecordingsPresenter$1.call(RecordingsPresenter.java:74)
at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:46)
at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.Observable.unsafeSubscribe(Observable.java:10151)
at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:48)
at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:33)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.Observable.unsafeSubscribe(Observable.java:10151)
at rx.internal.operators.OperatorSubscribeOn$1.call(OperatorSubscribeOn.java:94)
at rx.internal.schedulers.EventLoopsScheduler$EventLoopWorker$1.call(EventLoopsScheduler.java:172)
at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:152)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:265)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
拜托，有人帮助我！
解决
我删除了我的应用并重新安装了。现在，alpha9 verison一切正常。
答案 0 :(得分：8)
您必须提供Migration.In Live App，您无法告诉每个人请删除应用并重新安装应用。
In Room新版本1.0.0-alpha9 Room增加了对NOT NULL约束的支持。
这将改变Room生成的架构。因为它会更改架构，所以它还会更改数据库的identityHash以及Room用于唯一标识每个数据库版本的身份。因此，我们需要迁移
对于从1.0.0-alpha5迁移到1.0.0-alpha9，请访问以下文章。非常好的文章，从旧版本迁移到1.0.0-alpha9版本。
答案 1 :(得分：0)
有同样的问题。 请注意，数据库在卸载后可能会持续存在。
您需要做的清单
android:allowBackup="false"