未为MediaProvider调用SyncAdapter onPerformSync

public class MySyncAdapter extends AbstractThreadedSyncAdapter {
    // 构造函数
    public MySyncAdapter(Context context, boolean autoInitialize) {
        super(context, autoInitialize);
    }

    // 同步方法
    @Override
    public void onPerformSync(Account account, Bundle extras, String authority, ContentProviderClient provider, SyncResult syncResult) {
        // 执行实际的数据同步操作
        // ...
    }
}

// 在应用程序的代码中，创建SyncAdapter并进行初始化
// ...
// 创建SyncAdapter实例
MySyncAdapter syncAdapter = new MySyncAdapter(context, true);
// 初始化SyncAdapter
ContentResolver.setSyncAutomatically(account, authority, true);
ContentResolver.addPeriodicSync(account, authority, extras, syncInterval);
ContentResolver.setIsSyncable(account, authority, 1);
ContentResolver.requestSync(account, authority, extras);
// ...