如何使用Android Backup Service进行数据备份和恢复[页5]
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时间: 2023-08-23
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javapublic class MyBackupAgent extends BackupAgentHelper {
// 定义备份的数据类型
static final String PREFS_BACKUP_KEY = "prefs";
static final String DATABASE_BACKUP_KEY = "database";
@Override
public void onCreate() {
// 定义备份的数据类型
SharedPreferencesBackupHelper prefsHelper =
new SharedPreferencesBackupHelper(this, getPackageName() + "_preferences");
addHelper(PREFS_BACKUP_KEY, prefsHelper);
FileBackupHelper fileHelper = new FileBackupHelper(this, "my_file.txt");
addHelper("file", fileHelper);
SQLiteOpenHelper helper = new MyDatabaseHelper(this);
SQLiteDatabase db = helper.getWritableDatabase();
BackupHelper dbHelper = new SQLiteDatabaseBackupHelper(this, db, "my_database.db");
addHelper(DATABASE_BACKUP_KEY, dbHelper);
}
}
在上面的示例中,我们使用SharedPreferencesBackupHelper、FileBackupHelper和SQLiteDatabaseBackupHelper来备份SharedPreferences、文件和SQLite数据库。需要注意的是,我们需要提供每个备份数据类型的唯一标识符。
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