Android 2.2数据备份：如何备份DefaultSharedPreferences？

发布于 2024-09-28 00:25:44 字数 805 浏览 2 评论 0原文

我正在实现 Android OS 2.2 中的新 BackupAgentHelper。

为了使其工作，您需要提供要备份的 SharedPreferences 的名称：

public class MyPrefsBackupAgent extends BackupAgentHelper {
// The name of the SharedPreferences file
static final String PREFS = "user_preferences";

// A key to uniquely identify the set of backup data
static final String PREFS_BACKUP_KEY = "prefs";

// Allocate a helper and add it to the backup agent
void onCreate() {
    SharedPreferencesBackupHelper helper = new SharedPreferencesBackupHelper(this, PREFS);
    addHelper(PREFS_BACKUP_KEY, helper);
}
}

问题是我在应用程序中使用 PreferenceManager.getDefaultSharedPreferences() 方法来获取默认共享首选项实例。现在我需要提供该文件的名称。我怎样才能知道那是什么名字？

（为什么他们不提供一个只执行 DefaultSharedPreferences 备份的助手？）

原文

I am implementing the new BackupAgentHelper from Android OS 2.2.

For it to work you need to supply the name of the SharedPreferences that you want to backup:

public class MyPrefsBackupAgent extends BackupAgentHelper {
// The name of the SharedPreferences file
static final String PREFS = "user_preferences";

// A key to uniquely identify the set of backup data
static final String PREFS_BACKUP_KEY = "prefs";

// Allocate a helper and add it to the backup agent
void onCreate() {
    SharedPreferencesBackupHelper helper = new SharedPreferencesBackupHelper(this, PREFS);
    addHelper(PREFS_BACKUP_KEY, helper);
}
}

Problem is I use the PreferenceManager.getDefaultSharedPreferences() method in my application to get the default shared preferences instance. Now I need to supply the name of that file. How can I find out what name that is?

(And why do they not supply a helper that just does a DefaultSharedPreferences backup?)

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