Room Persistence Library：尝试重新打开一个已经关闭的对象

Question

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，我收到了这个错误：

java.lang.IllegalStateException: attempt to re-open an already-closed object: SQLiteDatabase: /data/data/package_name/databases/app_db

我该如何解决这个问题？

编辑：

我正在使用 Dagger 2 的 MVP 架构。我有 DatabaseHelper class 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();
}

我的房间数据库：

@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，出现该错误。

这是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.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$OpenHelper.getWritableSupportDatabase(FrameworkSQLiteOpenHelper.java:106)
       at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper.getWritableDatabase(FrameworkSQLiteOpenHelper.java:82)
       at android.arch.persistence.room.RoomDatabase.query(RoomDatabase.java:191)
       at uz.iumarov.ieltsspeaking.data.local.database.daos.RecordingDao_Impl.getAllRecordings(RecordingDao_Impl.java:167)
       at uz.iumarov.ieltsspeaking.data.local.database.DatabaseHelper.getAllRecording(DatabaseHelper.java:361)
       at uz.iumarov.ieltsspeaking.ui.main.recordingsFragment.RecordingsPresenter.call(RecordingsPresenter.java:77)
       at uz.iumarov.ieltsspeaking.ui.main.recordingsFragment.RecordingsPresenter.call(RecordingsPresenter.java:74)
       at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:46)
       at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
       at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
       at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
       at rx.Observable.unsafeSubscribe(Observable.java:10151)
       at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:48)
       at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:33)
       at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
       at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
       at rx.Observable.unsafeSubscribe(Observable.java:10151)
       at rx.internal.operators.OperatorSubscribeOn.call(OperatorSubscribeOn.java:94)
       at rx.internal.schedulers.EventLoopsScheduler$EventLoopWorker.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.access1(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：

一段时间后，我开始收到不同的错误：

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.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$OpenHelper.getWritableSupportDatabase(FrameworkSQLiteOpenHelper.java:106)
       at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper.getWritableDatabase(FrameworkSQLiteOpenHelper.java:82)
       at android.arch.persistence.room.RoomDatabase.query(RoomDatabase.java:191)
       at uz.iumarov.ieltsspeaking.data.local.database.daos.RecordingDao_Impl.getAllRecordings(RecordingDao_Impl.java:167)
       at uz.iumarov.ieltsspeaking.data.local.database.DatabaseHelper.getAllRecording(DatabaseHelper.java:361)
       at uz.iumarov.ieltsspeaking.ui.main.recordingsFragment.RecordingsPresenter.call(RecordingsPresenter.java:77)
       at uz.iumarov.ieltsspeaking.ui.main.recordingsFragment.RecordingsPresenter.call(RecordingsPresenter.java:74)
       at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:46)
       at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
       at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
       at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
       at rx.Observable.unsafeSubscribe(Observable.java:10151)
       at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:48)
       at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:33)
       at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
       at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
       at rx.Observable.unsafeSubscribe(Observable.java:10151)
       at rx.internal.operators.OperatorSubscribeOn.call(OperatorSubscribeOn.java:94)
       at rx.internal.schedulers.EventLoopsScheduler$EventLoopWorker.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.access1(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，出现迁移错误：

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.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$OpenHelper.getWritableSupportDatabase(FrameworkSQLiteOpenHelper.java:106)
       at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper.getWritableDatabase(FrameworkSQLiteOpenHelper.java:82)
       at android.arch.persistence.room.RoomDatabase.query(RoomDatabase.java:191)
       at uz.iumarov.ieltsspeaking.data.local.database.daos.RecordingDao_Impl.getAllRecordings(RecordingDao_Impl.java:167)
       at uz.iumarov.ieltsspeaking.data.local.database.DatabaseHelper.getAllRecording(DatabaseHelper.java:361)
       at uz.iumarov.ieltsspeaking.ui.main.recordingsFragment.RecordingsPresenter.call(RecordingsPresenter.java:77)
       at uz.iumarov.ieltsspeaking.ui.main.recordingsFragment.RecordingsPresenter.call(RecordingsPresenter.java:74)
       at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:46)
       at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
       at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
       at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
       at rx.Observable.unsafeSubscribe(Observable.java:10151)
       at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:48)
       at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:33)
       at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
       at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
       at rx.Observable.unsafeSubscribe(Observable.java:10151)
       at rx.internal.operators.OperatorSubscribeOn.call(OperatorSubscribeOn.java:94)
       at rx.internal.schedulers.EventLoopsScheduler$EventLoopWorker.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.access1(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，有人帮帮我！

已解决

我删除了我的应用程序并重新安装了。现在，alpha9 verison 一切正常。

Answer 1

你必须提供Migration.In Live App你不能告诉每个人请删除应用程序并重新安装应用程序。

In Room 新版本 1.0.0-alpha9 Room 添加了对 NOT NULL 约束的支持。

这将更改 Room 生成的架构。因为它改变了模式，它也改变了数据库的 identityHash，Room 使用它来唯一标识每个数据库版本。因此，我们需要一个迁移

对于从 1.0.0-alpha5 到 1.0.0-alpha9 的迁移，请访问下面的文章。从旧版本迁移到 1.0.0-alpha9 版本的非常好的文章。

https://medium.com/@manuelvicnt/android-room-upgrading-alpha-versions-needs-a-migration-with-kotlin-or-nonnull-7a2d140f05b9

Answer 2

有同样的问题。请注意，卸载后数据库可能会保留。

在清单中你需要做

    android:allowBackup="false"

Room Persistence Library：尝试重新打开一个已经关闭的对象

Room Persistence Library: attempt to re-open an already-closed object

sqlite

android

android-room