房间持久性库：尝试重新打开已关闭的对象

Question

java.lang.IllegalStateException：尝试重新打开已关闭的对象：SQLiteDatabase:/data/data/package_name/databases/app_db

我该怎么解决这个？

编辑：

@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();
}

@Database(version = 22, entities = {
        DifficultyEntity.class, // ....
})
@Singleton
public abstract class AppDatabase extends RoomDatabase {

    public abstract DifficultyDao difficultyDao();
    //....
}

当我调用GetAllDowleds方法时，我得到了这个错误。

以下是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：

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)

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)

我删除了我的应用程序并重新安装。现在，alpha9 Verison的一切工作都很好。

Answer 1

你必须提供迁移。在Live应用中，你不能告诉每个人请删除应用程序和重新安装应用程序。

在Room新版本1.0.0-alpha9中，Room增加了对NOT NULL约束的支持。

这将改变Room生成的模式。因为它改变了模式，所以它也改变了DB的identityHash，Room使用它唯一地标识每个DB版本。因此，我们需要一个迁移