相关疑难解决方法(0)

房间1.1.0版.

迁移后第一次运行时出现此错误.

如果我关闭应用程序并再次启动它,它运行良好.

ROOM: Cannot run invalidation tracker. Is the db closed?
java.lang.IllegalStateException: Cannot perform this operation because the connection pool has been closed.
    at android.database.sqlite.SQLiteConnectionPool.throwIfClosedLocked(SQLiteConnectionPool.java:1182)
    at android.database.sqlite.SQLiteConnectionPool.waitForConnection(SQLiteConnectionPool.java:792)
    at android.database.sqlite.SQLiteConnectionPool.acquireConnection(SQLiteConnectionPool.java:518)

Caused By : SQL(query) error or missing database.
    (no such table: room_table_modification_log (code 1): , while compiling: DELETE FROM proposals WHERE hotel_id = ?)
#################################################################
    at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
    at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:1095)
    at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:660)
    at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
    at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:59)
    at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
    at android.database.sqlite.SQLiteDatabase.compileStatement(SQLiteDatabase.java:1417)
    at android.arch.persistence.db.framework.FrameworkSQLiteDatabase.compileStatement(FrameworkSQLiteDatabase.java:64)
    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:77)
    at android.arch.persistence.room.SharedSQLiteStatement.acquire(SharedSQLiteStatement.java:87) …

我有一个水平的回收站视图,里面有自定义项目.每个项目都可以在Recycler视图中保存当前项目的位置.我想使用拖放移动项目时更新项目位置.但是当水平视图中有三个以上的项目时,数据会被删除.请帮帮我. 源代码

这是我在Logcat中得到的:

E/ROOM:无效跟踪器初始化两次:/.

E /项目已移动:Counterfrom3

下一个项目:to2

在onCreate中初始化数据库.

 db = Room.databaseBuilder(getApplicationContext(), AppDatabase.class, DB_NAME)
                .fallbackToDestructiveMigration()
                .allowMainThreadQueries()
                .build();

RecyclerView适配器代码.

@Override
public boolean onItemMove(int fromPosition, int toPosition) {
    String name = dataSet.get(fromPosition).getName();
    //this will make "Add item" do not move from its first position..
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        if (!(Objects.equals(name, "Add") || (toPosition == 0 && fromPosition == 1))) {
            Collections.swap(dataSet, fromPosition, toPosition);
            MoveItem(fromPosition, toPosition);
            notifyItemMoved(fromPosition, toPosition);
            return true;
        }
    }
    return false;
}

移动项目时更新数据的代码.

 public static void MoveItem(int fromPosition,int toPosition){
        String …

升级到kotlin 1.2.40后,我在构建时遇到以下错误:

e: [kapt] An exception occurred: java.lang.NoClassDefFoundError: org/jetbrains/kotlin/serialization/jvm/JvmProtoBufUtil
at me.eugeniomarletti.kotlin.metadata.KotlinClassMetadata$data$2.invoke(KotlinMetadata.kt:51)
at me.eugeniomarletti.kotlin.metadata.KotlinClassMetadata$data$2.invoke(KotlinMetadata.kt:50)
at kotlin.SynchronizedLazyImpl.getValue(Lazy.kt:131)
at me.eugeniomarletti.kotlin.metadata.KotlinClassMetadata.getData(KotlinMetadata.kt)
at android.arch.persistence.room.ext.KotlinMetadataProcessor$DefaultImpls.getParameterNames(KotlinMetadataProcessor.kt:33)
at android.arch.persistence.room.processor.PojoProcessor.getParameterNames(PojoProcessor.kt:73)
at android.arch.persistence.room.processor.PojoProcessor.getParamNames(PojoProcessor.kt:245)
at android.arch.persistence.room.processor.PojoProcessor.chooseConstructor(PojoProcessor.kt:263)
at android.arch.persistence.room.processor.PojoProcessor.doProcess(PojoProcessor.kt:207)
at android.arch.persistence.room.processor.PojoProcessor.access$doProcess(PojoProcessor.kt:73)
at android.arch.persistence.room.processor.PojoProcessor$process$1.invoke(PojoProcessor.kt:104)
at android.arch.persistence.room.processor.PojoProcessor$process$1.invoke(PojoProcessor.kt:73)
at android.arch.persistence.room.processor.cache.Cache$Bucket.get(Cache.kt:46)
at android.arch.persistence.room.processor.PojoProcessor.process(PojoProcessor.kt:101)
at android.arch.persistence.room.processor.EntityProcessor.doProcess(EntityProcessor.kt:68)
at android.arch.persistence.room.processor.EntityProcessor.access$doProcess(EntityProcessor.kt:50)
at android.arch.persistence.room.processor.EntityProcessor$process$1.invoke(EntityProcessor.kt:57)
at android.arch.persistence.room.processor.EntityProcessor$process$1.invoke(EntityProcessor.kt:50)
at android.arch.persistence.room.processor.cache.Cache$Bucket.get(Cache.kt:46)
at android.arch.persistence.room.processor.EntityProcessor.process(EntityProcessor.kt:56)
at android.arch.persistence.room.processor.DatabaseProcessor.processEntities(DatabaseProcessor.kt:248)
at android.arch.persistence.room.processor.DatabaseProcessor.doProcess(DatabaseProcessor.kt:63)
at android.arch.persistence.room.processor.DatabaseProcessor.process(DatabaseProcessor.kt:53)
at android.arch.persistence.room.RoomProcessor$DatabaseProcessingStep.process(RoomProcessor.kt:57)
at com.google.auto.common.BasicAnnotationProcessor.process(BasicAnnotationProcessor.java:318)
at com.google.auto.common.BasicAnnotationProcessor.process(BasicAnnotationProcessor.java:171)
at org.jetbrains.kotlin.kapt3.ProcessorWrapper.process(annotationProcessing.kt:131)
at com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:794)
at com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:705)
at com.sun.tools.javac.processing.JavacProcessingEnvironment.access$1800(JavacProcessingEnvironment.java:91)
at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1039)
at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1180)
at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1170)
at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1068)
at org.jetbrains.kotlin.kapt3.AnnotationProcessingKt.doAnnotationProcessing(annotationProcessing.kt:87)
at …