安卓，领域:为什么方法isClosed()返回false？

Question

领域3.5.0

我在MyApp中添加了领域。

这里的片段：

public class MainApp extends MultiDexApplication {    
    private void setRealmDefaultSyncConfiguration(SyncUser syncUser, String realmURL) {
        SyncConfiguration sync = new SyncConfiguration.Builder(syncUser, realmURL).build();
            Realm.setDefaultConfiguration(sync );
            if (BuildConfig.DEBUG)
                Log.d(TAG, "setRealmDefaultSyncConfiguration: SUCCESS SET REALM DEFAULT CONFIGURATION:"
                        + "\nThreadSignature = " + AndroidUtil.getThreadSignature()
                        + "\nsyncUser = " + syncUser
                        + "\nrealmURL = " + realmURL
                        + "\nRealm = " + Realm.getDefaultInstance()
                        + "\nRealmget. DefaultConfiguration:\n\n" + Realm.getDefaultInstance().getConfiguration() + "\n\n"
                );
    }
}

下面是logcat数据：

 setRealmDefaultSyncConfiguration: SUCCESS SET REALM DEFAULT CONFIGURATION:
 Thread=main: id=1, priority=5, group=main
 syncUser = {UserId: 32afeeeeeeeeeeeeeeee3c63f5606c4b, AuthUrl: http://172.12.11.90:9080/auth, IsValid: true, Sessions: 0}
 realmURL = realm://172.12.11.90:9080/fccc46ssssssssssssssssb9e828700c/db
 Realm = io.realm.Realm@4225bd68
 Realmget. DefaultConfiguration:  
 realmDirectory: /data/data/com.myproject/files/realm-object-server/32afeeeee/fccc46bbe2354bae35d3ddb9e828700c
 realmFileName : db
 canonicalPath: /data/data/com.myproject/files/realm-object-server/32afeeeee3f5606c4b/fccc46ssssssssssssssssb9e828700c/db
 key: [length: 0]
 schemaVersion: 0
 migration: null
 deleteRealmIfMigrationNeeded: false
 durability: FULL
 schemaMediator: io.realm.DefaultRealmModuleMediator@42136c40
 readOnly: false
 compactOnLaunch: null
 serverUrl: realm://172.12.11.90:9080/fccc46ssssssssssssssssb9e828700c/db
 user: {UserId: 32afeeeeeeeeeeeeeeee3c63f5606c4b,
 AuthUrl: http://172.12.11.90:9080/auth, IsValid: true, Sessions: 0}
 errorHandler: io.realm.SyncManager$1@42068038
 deleteRealmOnLogout: false
 waitForInitialRemoteData: true

正如您可以在“主”线程上的create中看到的那样。

PersonFragment代码：

public class PersonsFragment extends Fragment {
    private Realm realm;

    @Nullable
        @Override
        public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.organizations_fragment, container, false);
            realm = Realm.getDefaultInstance();
            return rootView;
        }        

    @Override
    public void onDestroy() {
        super.onDestroy();
        if (BuildConfig.DEBUG)
            Log.d(TAG, "onDestroy():"
                    + "\nThreadSignature=" + AndroidUtil.getThreadSignature()
                    + "\nRealm global instance=" + Realm.getGlobalInstanceCount(Realm.getDefaultConfiguration())
                    + "\nrealm=" + realm);
        realm.close();
        if (BuildConfig.DEBUG)
            Log.d(TAG, "onDestroy():"
                    + "\nThreadSignature=" + AndroidUtil.getThreadSignature()
                    + "\nrealm.isClosed()=" + realm.isClosed()
                    + "\nRealm global instance=" + Realm.getGlobalInstanceCount(Realm.getDefaultConfiguration())
            );
    }
}

我的碎片的逻辑猫：

PersonsFragment(18573):onDestroy():
PersonsFragment(18573):Thread=main:id=1,priority=5,group=main
PersonsFragment(18573):Realm global instance = 1
PersonsFragment(18573):realm = io.realm.Realm@4225bd68  
PersonsFragment(18573):onDestroy():
PersonsFragment(18573):Thread=main:id=1,priority=5,group=main
PersonsFragment(18573):realm.isClosed() = false
PersonsFragment(18573):Realm global instance = 1

如您所见，isClose()仍然是false，而领域全局实例总是= 1，而且领域实例是在主线程上创建的。

Answer 1

更新我刚刚发现了这个问题这里

或者你可以跟着这个-

你可以试试这个，从这个问题中学到的东西。您可能打开了多个领域实例，在不同的线程上，您可以尝试使用下面的代码关闭onDestroy()中的每个领域实例-

while(!realm.isClosed()) realm.close();

然后检查isClosed()是否返回true。

另外，要以更好的方式处理不同线程上的领域实例，可以遵循@Zhuinden的方法-

try(Realm realm = Realm.getDefaultInstance()) {
   // use realm
} // auto-close

或者关闭finally块中的领域实例。

如果你还需要帮助，请告诉我。