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我是 android 新手，我在我的 APP 中使用了领域，但当时我没有指定 schemaversion，现在当我想升级应用程序并实施迁移时。

以前，我是这样做的，

Realm.init(getApplicationContext());

RealmConfiguration realmConfiguration =
                        new RealmConfiguration.Builder().build();

realm = Realm.getInstance(realmConfiguration);

现在，

Realm.init(getApplicationContext());

RealmConfiguration realmConfiguration =
                            new RealmConfiguration.Builder().schemaVersion(1).migration(new Migration()).build();

realm = Realm.getInstance(realmConfiguration);

而且，我收到了这个错误。

java.lang.IllegalArgumentException: Configurations cannot be different if used to open the same file. 
Cached configuration: 
realmDirectory: /data/user/0/in.avanti_app.student_companion.debug/files
realmFileName : default.realm
canonicalPath: /data/data/in.avanti_app.student_companion.debug/files/default.realm
key: [length: 0]
schemaVersion: 1
migration: in.avanti_app.student_companion.realmClasses.Migration@25
deleteRealmIfMigrationNeeded: false
durability: FULL
schemaMediator: io.realm.DefaultRealmModuleMediator@793ec9a4

New configuration: 
realmDirectory: /data/user/0/in.avanti_app.student_companion.debug/files
realmFileName : default.realm
canonicalPath: /data/data/in.avanti_app.student_companion.debug/files/default.realm
key: [length: 0]
schemaVersion: 0
migration: null
deleteRealmIfMigrationNeeded: false
durability: FULL
schemaMediator: io.realm.DefaultRealmModuleMediator@793ec9a4

我还覆盖了 Migration 类中的 hasCode 和 equals。

4

1 回答 1

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调用Realm.init(Context)在以下代码中初始化一个“默认配置”

public static synchronized void init(Context context) {
    if (BaseRealm.applicationContext == null) {
        if (context == null) {
            throw new IllegalArgumentException("Non-null context required.");
        }
        RealmCore.loadLibrary(context);
        defaultConfiguration = new RealmConfiguration.Builder(context).build();
        ObjectServerFacade.getSyncFacadeIfPossible().init(context);
        BaseRealm.applicationContext = context.getApplicationContext();
        SharedRealm.initialize(new File(context.getFilesDir(), ".realm.temp"));
    }
}

但是new RealmConfiguration.Builder(context).build();设置没有架构版本、迁移deleteIfMigrationNeeded()等的配置

为了设置一个新的默认配置，你需要创建你的配置然后调用Realm.setDefaultConfiguration(realmConfig);

RealmConfiguration realmConfiguration =
         new RealmConfiguration.Builder().schemaVersion(1).migration(new Migration()).build();
Realm.setDefaultConfiguration(realmConfiguration);
realm = Realm.getDefaultInstance();
于 2017-02-10T11:58:52.963 回答