Question

我突然开始在应用启动时就收到了这个运行时异常，而没有任何余地作为我的依赖。

07-20 19:48:37.703 18737-18771/mypackage.x E/AndroidRuntime: FATAL EXCEPTION: pool-4-thread-1
    Process: mypackage, PID: 18737
    java.lang.IllegalStateException: A migration from 3 to 2 was required but not found. Please provide the necessary Migration path via RoomDatabase.Builder.addMigration(Migration ...) or allow for destructive migrations via one of the RoomDatabase.Builder.fallbackToDestructiveMigration* methods.
        at android.arch.persistence.room.RoomOpenHelper.onUpgrade(RoomOpenHelper.java:97)
        at android.arch.persistence.room.RoomOpenHelper.onDowngrade(RoomOpenHelper.java:109)
        at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper$OpenHelper.onDowngrade(FrameworkSQLiteOpenHelper.java:144)
        at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:396)
        at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:298)
        at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper$OpenHelper.getWritableSupportDatabase(FrameworkSQLiteOpenHelper.java:96)
        at android.arch.persistence.db.framework.FrameworkSQLiteOpenHelper.getWritableDatabase(FrameworkSQLiteOpenHelper.java:54)
        at android.arch.persistence.room.RoomDatabase.compileStatement(RoomDatabase.java:244)
        at android.arch.persistence.room.SharedSQLiteStatement.createNewStatement(SharedSQLiteStatement.java:65)
        at android.arch.persistence.room.SharedSQLiteStatement.getStmt(SharedSQLiteStatement.java:72)
        at android.arch.persistence.room.SharedSQLiteStatement.acquire(SharedSQLiteStatement.java:87)
        at androidx.work.impl.model.WorkSpecDao_Impl.resetScheduledState(WorkSpecDao_Impl.java:337)
        at androidx.work.impl.WorkManagerImpl.rescheduleEligibleWork(WorkManagerImpl.java:514)
        at androidx.work.impl.utils.ForceStopRunnable.run(ForceStopRunnable.java:73)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:764)

以下是我对Android arch的一些依赖：

implementation "androidx.core:core-ktx:$ktx_version"
implementation "android.arch.paging:runtime:$paging_runtime"
implementation("android.arch.lifecycle:extensions:$android_arc_version") {
    force = true
}

implementation "android.arch.navigation:navigation-fragment-ktx:$navigation_version"
// use -ktx for Kotlin
implementation "android.arch.navigation:navigation-ui-ktx:$navigation_version"
implementation "android.arch.work:work-runtime-ktx:$work_version"

你知道是什么原因造成的吗？

Answer 1

事实证明，android.arch.work:work对房间库具有依赖性，而我使用的是工作库的版本1.0.0-alpha03。我本想排除依赖关系，但我注意到该工作组件有可用的更新，尝试了此更新后，它解决了此问题。因此，请升级您的工作库以解决此问题（当前更新的版本为1.0.0-alpha04）

不使用会议室的项目中会议室的运行时异常

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