すでに開いているレルムファイルをマイグレートできません〜レルム〜Android

Question

レルムのAndroidには新しく、現在私のプロジェクトでレルムを使用する必要がありますが、私はアプリを開く度に頻繁に起こるこのエラーCannot migrate a Realm file that is already open 。ここで

FATAL EXCEPTION: main 
Process: com.etobee.driver, PID: 31866 
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.etobee.driver/com.etobee.driver.activity.HomeActivity}: java.lang.IllegalStateException: Cannot migrate a Realm file that is already open: /data/data/com.etobee.driver/files/default6 
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2460) 
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2522) 
    at android.app.ActivityThread.access$800(ActivityThread.java:169) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1421) 
    at android.os.Handler.dispatchMessage(Handler.java:111) 
    at android.os.Looper.loop(Looper.java:194) 
    at android.app.ActivityThread.main(ActivityThread.java:5546) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java:372) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:967) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:762) 
Caused by: java.lang.IllegalStateException: Cannot migrate a Realm file that is already open: /data/data/com.etobee.driver/files/default6 
    at io.realm.BaseRealm$3.onResult(BaseRealm.java:740) 
    at io.realm.RealmCache.invokeWithGlobalRefCount(RealmCache.java:274) 
    at io.realm.BaseRealm.migrateRealm(BaseRealm.java:735) 
    at io.realm.Realm.migrateRealm(Realm.java:1361) 
    at com.etobee.driver.util.RealMHelper.init(RealMHelper.java:35) 
    at com.etobee.driver.activity.DefaultActivity.onCreate(DefaultActivity.java:138) 
    at com.etobee.driver.activity.HomeActivity.onCreate(HomeActivity.java:91) 
    at android.app.Activity.performCreate(Activity.java:5975) 
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1111) 
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2413) 
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2522)  
    at android.app.ActivityThread.access$800(ActivityThread.java:169)  
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1421)  
    at android.os.Handler.dispatchMessage(Handler.java:111)  
    at android.os.Looper.loop(Looper.java:194)  
    at android.app.ActivityThread.main(ActivityThread.java:5546)  
    at java.lang.reflect.Method.invoke(Native Method)  
    at java.lang.reflect.Method.invoke(Method.java:372) 

は私が私の主な活動にonCreateの内側にこれを呼んで、レルムを初期化する方法です。

public static void init(Context context){ 
    // Create a RealmConfiguration that saves the Realm file in the app's "files" directory. 
    RealmConfiguration config0 = new RealmConfiguration.Builder(context) 
      .name("default6") 
      .schemaVersion(7) 
      .build(); 
    try { 
     Realm.migrateRealm(config0, new RealmMigration() { /**--- ERROR HERE **/ 
      @Override 
      public void migrate(DynamicRealm realm, long oldVersion, long newVersion) { 
       // DynamicRealm exposes an editable schema 
       RealmSchema schema = realm.getSchema(); 
      } 
     }); 
    } catch (FileNotFoundException ignored) { 
     // If the Realm file doesn't exist, just ignore. 
    } 
    Realm.setDefaultConfiguration(config0); 
} 

常に起こるとは限りませんが、ランダムに起こることはありますが、かなり頻繁に起こります。私はこの問題を探しましたが、まだ何も見つかりませんでした。 助けてください。

ありがとうございます。

Answer 1

static RealmConfiguration realmConfiguration = null; 

public static void init(Context context){ 
    if(realmConfiguration == null) { 
     // Create a RealmConfiguration that saves the Realm file in the app's "files" directory. 
     realmConfiguration = new RealmConfiguration.Builder(context.getApplicationContext()) 
      .name("default6") 
      .schemaVersion(7) 
      .migration(new MyMigration()) 
      .build(); 
     Realm.setDefaultConfiguration(realmConfiguration); 
    } 
} 

そして

public class MyMigration implements RealmMigration { 
     @Override 
     public void migrate(DynamicRealm realm, long oldVersion, long newVersion) { 
      // DynamicRealm exposes an editable schema 
      RealmSchema schema = realm.getSchema(); 
      // Loop through each version when an upgrade occurs. 
      for (long version = oldVersion + 1; version <= newVersion; version++) { 
       switch (version) { 
        case 1: 
        // migrate to version 1 
        break; 
        case 2: 
        // migrate to version 2 
        break;   
        //... 
        case 7: 
        // migrate to version 7 
        break; 
       } 
      } 
     } 

     @Override 
     public int hashCode() { 
      return MyMigration.class.hashCode(); 
     } 

     @Override 
     public boolean equals(Object obj) { 
      return obj != null && obj instanceof MyMigration; 
     } 
}