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社区首页 >问答首页 >更新应用程序上的领域迁移问题

问更新应用程序上的领域迁移问题
EN

Stack Overflow用户
提问于 2017-04-03 23:42:53
回答 2查看 702关注 0票数 0

我在Android模拟器上做了一些migration realm测试，没有遇到任何问题，但是在production中，有些设备正在进行trouble迁移。

在第1版中：

代码语言：javascript
运行
复制
public class Configuration extends Application {

    @Override
    public void onCreate() {
        super.onCreate();

        Realm.init(this);

        RealmConfiguration configuration = new RealmConfiguration.Builder()
                .name("myapp.realm").schemaVersion(1).build();
        Realm.setDefaultConfiguration(configuration);
    }
}

在第2版中：

代码语言：javascript
运行
复制
public class Configuration extends Application {

    @Override
    public void onCreate() {
        super.onCreate();

        Realm.init(this);
        RealmConfiguration configuration = new RealmConfiguration.Builder()
                .name("myapp.realm").schemaVersion(2).migration(new MyMigration()).build();
        Realm.setDefaultConfiguration(configuration);

    }

    private class MyMigration implements RealmMigration {
        @Override
        public void migrate(DynamicRealm realm, long oldVersion, long newVersion) {
            RealmSchema schema = realm.getSchema();

            if (oldVersion == 1) {
                schema.get(ClassRealm.class.getSimpleName())
                        .addField(ClassRealm.STRING_FIELD_NAME, String.class);

                schema.create(AnotherClassRealm.class.getSimpleName())
                        .addField(AnotherClassRealm.INTEGER_FIELD_NAME, Integer.class, FieldAttribute.PRIMARY_KEY)
                        .addField(AnotherClassRealm.STRING_FIELD1_NAME, String.class, FieldAttribute.REQUIRED)
                        .addField(AnotherClassRealm.STRING_FIELD2_NAME, String.class, FieldAttribute.REQUIRED)
                        .addField(AnotherClassRealm.DATE_FIELD_NAME, Date.class, FieldAttribute.REQUIRED);
                oldVersion++;
            }

        }
    }
}

升级到新版本后，错误：

设备: Galaxy J5 (j5lte)，Android: 6.0

代码语言：javascript
运行
复制
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3415)
    at android.app.ActivityThread.access$1100(ActivityThread.java:229)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1821)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:148)
    at android.app.ActivityThread.main(ActivityThread.java:7325)
    at java.lang.reflect.Method.invoke(Method.java)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'io.realm.RealmObjectSchema io.realm.RealmObjectSchema.a(java.lang.String, java.lang.Class, io.realm.e[])' on a null object reference
    at myapp.configuration.Configuration$MyMigration.migrate(Configuration.java)
    at io.realm.BaseRealm$4.onResult(BaseRealm.java)
    at io.realm.RealmCache.createRealmOrGetFromCache(RealmCache.java)
    at <OR>.release(RealmCache.java)
    at <OR>.validateConfiguration(RealmCache.java)
    at <OR>.invokeWithGlobalRefCount(RealmCache.java)
    at <OR>.updateSchemaCache(RealmCache.java)
    at <OR>.findColumnIndices(RealmCache.java)
    at <OR>.storeColumnIndices(RealmCache.java)
    at io.realm.BaseRealm.isInTransaction(BaseRealm.java)
    at <OR>.setVersion(BaseRealm.java)
    at <OR>.get(BaseRealm.java)
    at <OR>.get(BaseRealm.java)
    at <OR>.get(BaseRealm.java)
    at <OR>.deleteRealm(BaseRealm.java)
    at <OR>.migrateRealm(BaseRealm.java)
    at io.realm.Realm.init(Realm.java)
    at <OR>.createInstance(Realm.java)
    at <OR>.initializeRealm(Realm.java)
    at <OR>.createObject(Realm.java)
    at <OR>.createObjectInternal(Realm.java)
    at <OR>.copyToRealm(Realm.java)
    at <OR>.copyFromRealm(Realm.java)
    at <OR>.where(Realm.java)
    at <OR>.executeTransaction(Realm.java)
    at <OR>.copyOrUpdate(Realm.java)
    at <OR>.createDetachedCopy(Realm.java)
    at <OR>.checkMaxDepth(Realm.java)
    at <OR>.migrateRealm(Realm.java)
    at <OR>.updateSchemaCache(Realm.java)
    at <OR>.isInTransaction(Realm.java)
    at io.realm.Realm.init(Realm.java)
    at <OR>.createInstance(Realm.java)
    at <OR>.initializeRealm(Realm.java)
    at <OR>.createObject(Realm.java)
    at <OR>.createObjectInternal(Realm.java)
    at <OR>.copyToRealm(Realm.java)
    at <OR>.copyFromRealm(Realm.java)
    at <OR>.where(Realm.java)
    at <OR>.executeTransaction(Realm.java)
    at <OR>.copyOrUpdate(Realm.java)
    at <OR>.createDetachedCopy(Realm.java)
    at <OR>.checkMaxDepth(Realm.java)
    at <OR>.migrateRealm(Realm.java)
    at <OR>.updateSchemaCache(Realm.java)
    at <OR>.isInTransaction(Realm.java)
    at io.realm.RealmCache.createRealmOrGetFromCache(RealmCache.java)
    at <OR>.release(RealmCache.java)
    at <OR>.validateConfiguration(RealmCache.java)
    at <OR>.invokeWithGlobalRefCount(RealmCache.java)
    at <OR>.updateSchemaCache(RealmCache.java)
    at <OR>.findColumnIndices(RealmCache.java)
    at <OR>.storeColumnIndices(RealmCache.java)
    at io.realm.Realm.getDefaultInstance(Realm.java)
    at myapp.MyView.onCreate(MyView.java)
    at android.app.Activity.performCreate(Activity.java:6904)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1136)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3266)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3415)
    at android.app.ActivityThread.access$1100(ActivityThread.java:229)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1821)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:148)
    at android.app.ActivityThread.main(ActivityThread.java:7325)
    at java.lang.reflect.Method.invoke(Method.java)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

另一个:设备: Galaxy S3 Neo (s3ve3gds)，Android: 4.4

代码语言：javascript
运行
复制
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2500)
    at android.app.ActivityThread.access$900(ActivityThread.java:171)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1309)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:146)
    at android.app.ActivityThread.main(ActivityThread.java:5679)
    at java.lang.reflect.Method.invokeNative(Method.java)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
    at dalvik.system.NativeStart.main(NativeStart.java)
Caused by: java.lang.NullPointerException
    at myapp.configuration.Configuration$MyMigration.migrate(Configuration.java)
    at io.realm.BaseRealm$4.onResult(BaseRealm.java)
    at io.realm.RealmCache.createRealmOrGetFromCache(RealmCache.java)
    at <OR>.release(RealmCache.java)
    at <OR>.validateConfiguration(RealmCache.java)
    at <OR>.invokeWithGlobalRefCount(RealmCache.java)
    at <OR>.updateSchemaCache(RealmCache.java)
    at <OR>.findColumnIndices(RealmCache.java)
    at <OR>.storeColumnIndices(RealmCache.java)
    at io.realm.BaseRealm.isInTransaction(BaseRealm.java)
    at <OR>.setVersion(BaseRealm.java)
    at <OR>.get(BaseRealm.java)
    at <OR>.get(BaseRealm.java)
    at <OR>.get(BaseRealm.java)
    at <OR>.deleteRealm(BaseRealm.java)
    at <OR>.migrateRealm(BaseRealm.java)
    at io.realm.Realm.init(Realm.java)
    at <OR>.createInstance(Realm.java)
    at <OR>.initializeRealm(Realm.java)
    at <OR>.createObject(Realm.java)
    at <OR>.createObjectInternal(Realm.java)
    at <OR>.copyToRealm(Realm.java)
    at <OR>.copyFromRealm(Realm.java)
    at <OR>.where(Realm.java)
    at <OR>.executeTransaction(Realm.java)
    at <OR>.copyOrUpdate(Realm.java)
    at <OR>.createDetachedCopy(Realm.java)
    at <OR>.checkMaxDepth(Realm.java)
    at <OR>.migrateRealm(Realm.java)
    at <OR>.updateSchemaCache(Realm.java)
    at <OR>.isInTransaction(Realm.java)
    at io.realm.Realm.init(Realm.java)
    at <OR>.createInstance(Realm.java)
    at <OR>.initializeRealm(Realm.java)
    at <OR>.createObject(Realm.java)
    at <OR>.createObjectInternal(Realm.java)
    at <OR>.copyToRealm(Realm.java)
    at <OR>.copyFromRealm(Realm.java)
    at <OR>.where(Realm.java)
    at <OR>.executeTransaction(Realm.java)
    at <OR>.copyOrUpdate(Realm.java)
    at <OR>.createDetachedCopy(Realm.java)
    at <OR>.checkMaxDepth(Realm.java)
    at <OR>.migrateRealm(Realm.java)
    at <OR>.updateSchemaCache(Realm.java)
    at <OR>.isInTransaction(Realm.java)
    at io.realm.RealmCache.createRealmOrGetFromCache(RealmCache.java)
    at <OR>.release(RealmCache.java)
    at <OR>.validateConfiguration(RealmCache.java)
    at <OR>.invokeWithGlobalRefCount(RealmCache.java)
    at <OR>.updateSchemaCache(RealmCache.java)
    at <OR>.findColumnIndices(RealmCache.java)
    at <OR>.storeColumnIndices(RealmCache.java)
    at io.realm.Realm.getDefaultInstance(Realm.java)
    at myapp.MyView.onCreate(MyView.java)
    at android.app.Activity.performCreate(Activity.java:5582)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2405)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2500)
    at android.app.ActivityThread.access$900(ActivityThread.java:171)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1309)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:146)
    at android.app.ActivityThread.main(ActivityThread.java:5679)
    at java.lang.reflect.Method.invokeNative(Method.java)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
    at dalvik.system.NativeStart.main(NativeStart.java)

所有设备：

  • 银河大Neo (挡板板)
  • 银河Tab3V 7.0 (goyave3gsea)
  • 银河S7边缘(hero2lte)
  • 银河J5(2016) (j5xnlte)
  • Moto G(4) Plus (athene_f)
  • Galaxy J1 Mini (j1mini3g)
  • 银河Win2 (coreprimeltedtv)
  • 联想K5 (A6020l36)
  • Moto G Turbo版(merlin)
  • Moto G4 Play (harpia_t)
  • 星系S3 Neo (s3ve3gds)
  • STUDIO_SELFIE
  • 银河Core2 (卡纳斯)
  • 银河J2 (j2lte)
  • 银河大奖赛(fortuna3gdtv)
  • 银河J3(2016) (j3xlte)
android
realm
EN

回答 2

Stack Overflow用户

回答已采纳

发布于 2017-04-07 05:25:17

当您使用ProGuard时，模型类会被混淆。这意味着ClassRealm.class.getSimpleName()不返回"ClassRealm"。

这是一种预期的行为。

当然，您可以通过添加您自己的过程保护配置来保留模型类的名称。

票数 1
EN

Stack Overflow用户

发布于 2019-01-31 11:44:21

如果您不太关心公开逻辑，那么您只需在整个MyMigration类上使用一个@ left注释，因为这个类将不会被Pro卫兵混淆。

代码语言：javascript
运行
复制
import android.support.annotation.Keep

@Keep
private class MyMigration implements RealmMigration {
    @Override
    public void migrate(DynamicRealm realm, long oldVersion, long newVersion) {
        RealmSchema schema = realm.getSchema();

        if (oldVersion == 1) {
            schema.get(ClassRealm.class.getSimpleName())
                    .addField(ClassRealm.STRING_FIELD_NAME, String.class);

            schema.create(AnotherClassRealm.class.getSimpleName())
                    .addField(AnotherClassRealm.INTEGER_FIELD_NAME, Integer.class, FieldAttribute.PRIMARY_KEY)
                    .addField(AnotherClassRealm.STRING_FIELD1_NAME, String.class, FieldAttribute.REQUIRED)
                    .addField(AnotherClassRealm.STRING_FIELD2_NAME, String.class, FieldAttribute.REQUIRED)
                    .addField(AnotherClassRealm.DATE_FIELD_NAME, Date.class, FieldAttribute.REQUIRED);
            oldVersion++;
        }

    }
}
票数 -1
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/43196064

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