java - 无法使用 Kotlin 在项目中设置 Realm

Question

我正在尝试使用 Realm 在 Kotlin 中构建一个测试项目。这是我的模型:

open class Book : RealmObject() {

    // Standard getters & setters generated by your IDE…
    @PrimaryKey
    open var id: Long = 0

    open var title = ""

    open var description = ""

    open var author = ""

    open var imageUrl = ""
}

这是我得到的异常:

FATAL EXCEPTION: main
                                                                        Process: app.androidhive.info.realm, PID: 18782
                                                                        java.lang.RuntimeException: Unable to start activity ComponentInfo{app.androidhive.info.realm/app.androidhive.info.realm.activity.MainActivity}: java.lang.IllegalArgumentException: Book is not part of the schema for this Realm
                                                                            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
                                                                            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
                                                                            at android.app.ActivityThread.-wrap11(ActivityThread.java)
                                                                            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
                                                                            at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                            at android.os.Looper.loop(Looper.java:148)
                                                                            at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                                            at java.lang.reflect.Method.invoke(Native Method)
                                                                            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
                                                                         Caused by: java.lang.IllegalArgumentException: Book is not part of the schema for this Realm

我四处寻找解决方案，并在 build.gradle 中添加了 classpath "io.realm:realm-gradle-plugin:2.2.2"应用插件:'realm-android' 和

dependencies {
    ...
    // Realm
    compile 'io.realm:realm-android:0.87.4'
    kapt "io.realm:realm-annotations:0.87.4"
    kapt "io.realm:realm-annotations-processor:0.87.4"
}

进入模块应用程序中的构建脚本。它给了我另一个问题:

Error:(15, 48) Cannot access '<init>': it is public/*package*/ in 

'Builder'
/Volumes/Toshiba/Users/macuser/Development/Android/Exersises/MyApplication/app/src/main/java/realmtest/realm/RealmController.kt
Error:(27, 15) Unresolved reference: refresh
Error:(34, 15) Unresolved reference: clear
Error:(53, 23) Unresolved reference: allObjects

[KOTLIN] deleting /Volumes/Toshiba/Users/macuser/Development/Android/Exersises/MyApplication/app/build/tmp/kotlin-classes/debug on error

只有 Book 是用 java 编写的，我才能成功构建我的项目。有什么建议可以让 Realm 和 Kotlin 协同工作吗？

Answer 1

使用RealmClass注解+RealmModel接口(interface)

import io.realm.Realm
import io.realm.RealmModel
import io.realm.annotations.PrimaryKey
import io.realm.annotations.RealmClass

@RealmClass
open class Example(
    @PrimaryKey open var Id : Long = 0,
    open var Field : String = ""
) : RealmModel

在模块gradle文件中添加

apply plugin: 'realm-android'

在项目gradle文件中添加

classpath "io.realm:realm-gradle-plugin:2.2.2"

不需要额外的编译/kapt