Android “房间”;找不到“的实现”;即使使用kapt
我试图在我的项目中使用房间。Gradle可以很好地同步文件,但我在尝试获取数据库实例时遇到RunitomeException “原因:java.lang.RuntimeException:找不到com.fillooow.android.testtochka.BusinessLogic.database.GithubUserSearchDataBase的实现。GithubUserSearchDataBase\u Impl不存在” 我搜索了这个问题,发现解决方案是将以下行添加到build.gradle文件中:Android “房间”;找不到“的实现”;即使使用kapt,android,kotlin,android-room,Android,Kotlin,Android Room,我试图在我的项目中使用房间。Gradle可以很好地同步文件,但我在尝试获取数据库实例时遇到RunitomeException “原因:java.lang.RuntimeException:找不到com.fillooow.android.testtochka.BusinessLogic.database.GithubUserSearchDataBase的实现。GithubUserSearchDataBase\u Impl不存在” 我搜索了这个问题,发现解决方案是将以下行添加到build.gradl
implementation "android.arch.persistence.room:runtime:1.1.1"
implementation "android.arch.persistence.room:rxjava2:1.1.1"
kapt "android.arch.persistence.room:compiler:1.1.1"
也可以使用这个插件
apply plugin: 'kotlin-kapt'
但这是我的build.gradle文件,我仍然有这个问题:
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-kapt'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.fillooow.android.testtochka"
minSdkVersion 21
targetSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation 'com.android.support:support-v4:28.0.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation 'com.squareup.retrofit2:converter-gson:2.5.0'
implementation 'com.squareup.retrofit2:retrofit:2.5.0'
implementation 'io.reactivex.rxjava2:rxandroid:2.1.0'
implementation 'com.squareup.retrofit2:adapter-rxjava2:2.5.0'
implementation 'com.android.support:recyclerview-v7:28.0.0'
implementation 'com.android.support:design:28.0.0'
implementation 'com.jakewharton.rxbinding2:rxbinding-kotlin:2.0.0'
implementation 'com.google.android.gms:play-services-auth:16.0.1'
implementation 'com.facebook.android:facebook-android-sdk:[4,5)'
implementation 'com.vk:androidsdk:1.6.9'
implementation 'com.android.support:cardview-v7:28.0.0'
implementation 'com.squareup.picasso:picasso:2.71828'
implementation "android.arch.persistence.room:runtime:1.1.1"
implementation "android.arch.persistence.room:rxjava2:1.1.1"
kapt "android.arch.persistence.room:compiler:1.1.1"
}
这是数据库类
import android.arch.persistence.room.Room
import android.arch.persistence.room.RoomDatabase
import android.content.Context
abstract class GithubUserSearchDataBase : RoomDatabase(){
abstract fun githubUserSearchDataDao(): GithubUserSearchDataDao
companion object {
private var INSTANCE: GithubUserSearchDataBase? = null
fun getInstance(context: Context): GithubUserSearchDataBase?{
if (INSTANCE == null){
synchronized(GithubUserSearchDataBase::class){
INSTANCE = Room.databaseBuilder(context.applicationContext,
GithubUserSearchDataBase::class.java,
"github.db")
.build()
}
}
return INSTANCE
}
fun destroyInstance(){
INSTANCE = null
}
}
}
项目被清除和重建很多次。
那么,也许我错过了什么 您的gradle文件看起来不错。只需确保在添加了正确的导入后对其进行
Sync
您缺少的是数据库类顶部的@Database
注释
@Database(entities = [Entity1::class, Entity2::class, Entity3::class, Entity4::class], version = 1)
abstract class GithubUserSearchDataBase : RoomDatabase(){
abstract fun githubUserSearchDataDao(): GithubUserSearchDataDao
companion object {
private var INSTANCE: GithubUserSearchDataBase? = null
fun getInstance(context: Context): GithubUserSearchDataBase?{
if (INSTANCE == null){
synchronized(GithubUserSearchDataBase::class){
INSTANCE = Room.databaseBuilder(context.applicationContext,
GithubUserSearchDataBase::class.java,
"github.db")
.build()
}
}
return INSTANCE
}
fun destroyInstance(){
INSTANCE = null
}
}
}
在
@数据库
注释的实体
属性中,必须放置一个数组,其中包含使用@实体
注释注释的模型的所有类。我放了假名字,你应该放正确的。你有Sync
你的gradle文件吗?因为你的gradle文件现在看起来很好是的,同步了很多次。并重新开放Android Studio。结清了现金,等着回答,你又救了我两个小时的命