Question

我在Android Studio模拟器上进行了一些migration realm测试并没有遇到任何问题，但在production部分设备正在迁移trouble。

在版本1中：

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);
    }
}

在版本2中：

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++;
            }

        }
    }
}

升级到新版本后出现错误：

设备：Galaxy J5（j5lte）， Android：6.0

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

    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：

Galaxy Grand Neo（baffinlitedtv）
Galaxy Tab3V 7.0（goyave3gsea）
Galaxy S7 Edge（hero2lte）
Galaxy J5（2016）（j5xnlte）
Moto G（4）Plus（athene_f）
Galaxy J1 Mini（j1mini3g）
Galaxy Win2（coreprimeltedtv）
Lenovo K5（A6020l36）
Moto G Turbo Edition（梅林）
Moto G4 Play（harpia_t）
Galaxy S3 Neo（s3ve3gds）
STUDIO_SELFIE
Galaxy Core2（kanas）
Galaxy J2（j2lte）
Galaxy Grand Prime（fortuna3gdtv）
Galaxy J3（2016）（j3xlte）

Answer 1

使用ProGuard时，会对模型类进行模糊处理。这意味着ClassRealm.class.getSimpleName()不会返回"ClassRealm"。

这是预期的行为。

当然，您可以通过添加自己的proguard配置来保留模型类的名称。

Answer 2

如果您不太关心公开逻辑，因为Proguard不会混淆该类，则可以在整个MyMigration类上使用@keep批注。

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++;
        }

    }
}

更新应用程序上的域迁移问题

2 个答案: