Room +找不到实现DB + DB_Impl不存在 [英] Room + cannot find implementation DB + DB_Impl does not exist
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问题描述
运行应用程序时出现以下错误
I am getting following error while running application
java.lang.RuntimeException: cannot find implementation for com.abc.db.abdDB. abcDB_Impl does not exist
我的build.gradle具有以下配置:
My build.gradle has following configuration:
implementation "androidx.lifecycle:lifecycle-extensions:2.0.0-alpha1"
annotationProcessor "androidx.lifecycle:lifecycle-compiler:2.0.0-alpha1"
implementation "androidx.room:room-runtime:2.0.0-alpha1"
annotationProcessor "androidx.room:room-compiler:2.0.0-alpha1"
我的数据库类:
fun getDatabase(context: Context): abcDB? {
if (dbInstance == null) {
synchronized(abcDB::class.java) {
if (dbInstance == null) {
dbInstance = Room.databaseBuilder(context.applicationContext,
abcDB::class.java, "abc_db")
.fallbackToDestructiveMigration()
.addCallback(sRoomDatabaseCallback)
.build()
}
}
}
return dbInstance
}
有人尝试使用androidX API吗?有人可以帮忙找到解决方案吗?
Does anyone try to use androidX API? Can someone help to find solution for this?
推荐答案
如果使用Kotlin,则必须使用kapt
而不是annotationProcessor
,并且还必须应用kotlin-kapt
插件.
If you use Kotlin, then you have to use kapt
instead of annotationProcessor
, and must also apply kotlin-kapt
plugin.
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-kapt'
dependencies {
implementation "androidx.lifecycle:lifecycle-extensions:2.0.0-alpha1"
kapt "androidx.lifecycle:lifecycle-compiler:2.0.0-alpha1"
implementation "androidx.room:room-runtime:2.0.0-alpha1"
kapt "androidx.room:room-compiler:2.0.0-alpha1"
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