领域配置管理

本文介绍了领域配置管理的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在将Realm与我的android项目一起使用.当前，我在应用程序类中定义默认领域配置，如下所示-

I am using Realm with my android project. Currently I am defining the default realm configuration in my application class as follows-

@Override public void onCreate(){ super.onCreate(); myApplication=this; RealmConfiguration realmConfiguration = new RealmConfiguration.Builder(this).deleteRealmIfMigrationNeeded().build(); Realm.setDefaultConfiguration(realmConfiguration); Thread.setDefaultUncaughtExceptionHandler(new UnhandledExceptionHandler()); }

在当前情况下，只有1个用户使用设备.她使用自己的凭据登录到应用程序，并使用默认领域配置.

In current scenario only 1 user uses a device. She logs in to the app using her credentials and uses default realm configuration.

但是有新的要求，同一台android设备可以由不同的用户使用，因此我需要为每个用户使用不同的领域配置，以便每个用户都有自己的领域文件?

However with new requirements, the same android device can be used by different users and hence I need different realm configurations for each user so that each user has their own realm file right?

如果这是真的，那么管理领域配置的最佳方法是什么.我应该在登录活动中这样做吗?然后，我应该为登录活动中的每个用户创建不同的领域配置吗?

If this is true then what is the best way to manage realm configurations. Should I do that in my login activity? Should I then create different realm configurations for each user in login activity?

谢谢

阿普瓦(Apurva)

Apurva

推荐答案

IMO，使用工厂类将很有用，因为您正在管理多个Realm实例.可能看起来像这样，

IMO, using a factory class would be useful, since you are managing multiple Realm instances. which may look like this,

public class RealmFactory { /* Realm * CAUTION: Be careful which thread you call this from, it is not Thread safe */ public static Realm getRealmInstance(Context context, String primaryKeyFromUser) { return Realm.getInstance(getRealmConfiguration(context, primaryKeyFromUser)); } /* RealmConfiguration */ private static RealmConfiguration getRealmConfiguration(Context context, String primaryKeyFromUser) { return new RealmConfiguration.Builder(context) .name(primaryKeyFromUser) .encryptionKey(getSecurityKey()) .deleteRealmIfMigrationNeeded() .build(); } /* SecurityKey, * CAUTION: This is just a sample */ private static byte[] getSecurityKey() { char[] chars = "16CharacterLongPasswordKey4Realm".toCharArray(); byte[] key = new byte[chars.length * 2]; for (int i = 0; i < chars.length; i++) { key[i * 2] = (byte) (chars[i] >> 8); key[i * 2 + 1] = (byte) chars[i]; } return key; } /* Check for Realm file */ public static boolean isRealmFileExists(Context context, String primaryKeyFromUser) { RealmConfiguration realmConfiguration = new RealmConfiguration.Builder(context) .name(primaryKeyFromUser) .encryptionKey(getSecurityKey()) .deleteRealmIfMigrationNeeded() .build(); File realmFile = new File(realmConfiguration.getPath()); return realmFile.exists(); } /* Delete Realm file, if exists * CAUTION: if the Realm instance with given configuration is open, make sure you close it * first, before deleting it, else an Exception will be thrown. */ public static void deleteRealmFile(Context context, String primaryKeyFromUser) { RealmConfiguration realmConfiguration = new RealmConfiguration.Builder(context) .name(primaryKeyFromUser) .build(); Realm.deleteRealm(realmConfiguration); } /* Delete all Realm files, if exists * CAUTION: if the Realm instance with given configuration is open, make sure you close it * first, before deleting it, else an Exception will be thrown. */ public static void deleteAllRealmFiles(Context context) { File file = new File(context.getFilesDir().getPath()); File list[] = file.listFiles(new FileFilter() { @Override public boolean accept(File pathname) { return pathname.isFile(); } }); for (File deleteFile : list) { RealmConfiguration realmConfiguration = new RealmConfiguration.Builder(context) .name(deleteFile.getName()) .build(); Realm.deleteRealm(realmConfiguration); } } }