Question

我已实施public class CustomAdapter : BaseAdapter<Devices> { private ObservableCollection<Devices> _devices; private Activity _context; public CustomAdapter(Activity context, ObservableCollection<Devices> devices) : base() { _context = context; _devices = devices; } public override long GetItemId(int position) { return position; } public override View GetView(int position, View convertView, ViewGroup parent) { var device = _devices[position]; View view = convertView; if (view == null) view = ((Activity)_context).LayoutInflater.Inflate(Resource.Layout.listView, null); view.FindViewById<TextView>(Resource.Id.textName).Text = device.Name; view.FindViewById<TextView>(Resource.Id.textAddress).Text = device.Address; return view; } public override int Count { get { return _devices.Count; } } public override Devices this[int position] { get { return _devices[position]; } } }，同步频率为10秒。但在运行应用程序时，此同步频率会自动更新为900秒。

帐户创建代码：

SyncAdapter

记录跟踪：

public static void createSyncAccount(Context c) {
        boolean created = false;

        Account account = getAccount();
        AccountManager manager = (AccountManager)c.getSystemService(Context.ACCOUNT_SERVICE);

        if (manager != null && manager.addAccountExplicitly(account, null, null)) {
            final String AUTHORITY = UserIntakeContract.CONTENT_AUTHORITY;
            final long SYNC_FREQUENCY = 10; // (seconds)

            ContentResolver.setIsSyncable(account, AUTHORITY, 1);
            ContentResolver.setSyncAutomatically(account, AUTHORITY, true);
            ContentResolver.addPeriodicSync(account, AUTHORITY, new Bundle(), SYNC_FREQUENCY);
            created = true;
        }

        if (created) {
            SyncAdapter.performSync();
        }
    }

但我无法找到任何资源或文件说明最低轮询频率为15分钟（900秒）。

任何人都可以提供一些真实的资源或文档或解释吗？

Answer 1

您是否查看了“ContentResolver.addPeriodicSync”的文档？有一个民意调查频率文档，描述如下： long：执行同步的频率，以秒为单位。最低值为1小时。也许由于这种强制执行，这种变化正在发生。

Answer 2

看起来您正试图将时间段设置为超出限制。

看完来源：

https://android.googlesource.com/platform/frameworks/base/+/b267554/services/java/com/android/server/content/ContentService.java#415

可设置的最短时间段因版本而异。

SyncAdapter轮询频率

2 个答案: