Question

我正在Xamarin下开发一个跨平台的移动应用程序。该应用需要知道用户的坐标。我尝试使用Google的Fused API，以便在Android案例中获得最佳准确性。在阅读了几篇关于如何在Android中处理此类案例的博客文章后，我编写了一些代码，用于检查手机设置是否足以支持Fused API（启用位置并设置为高精度+ WiFi打开或WiFi扫描始终上）。如果不满足这些先决条件，则代码会针对此案例启动默认的Google解决方案，并期望用户在OnActivityResult中的回复。尽管紧迫＆＃34; OK＆＃34;作为用户，OnActivityResult中的代码保持接收resultCode = Result.Canceled。但是，设置已更改!!!我还尝试在OnActivityResult中再次执行检查，结果是分辨率弹出第二次，但这次Ok确实发送了resultCode = Result.Ok信号。我已经在stackoverflow中阅读了不少相关帖子，尝试了一些建议的技巧，但都没有解决问题。自11月初以来，我已经在Xamarin论坛上发布了这个问题，但还没有人提出解决方案。我正在测试中兴Blade L3 Android 5.0设备上的应用程序。我在此结束时发布了Android Activity的代码。如果有人能提出建议，我将非常感激。非常感谢你的时间。

[Activity(Label = "TestLocation", 
    Icon = "@drawable/icon", 
    Theme = "@style/MainTheme",
    MainLauncher = true, 
    ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity,
    GoogleApiClient.IConnectionCallbacks,
    GoogleApiClient.IOnConnectionFailedListener,
    Android.Gms.Location.ILocationListener 
    {
    private GoogleApiClient locationClient;
    private LocationRequest locationRequest;
    private LocationSettingsRequest locationSettingsRequest;
    private const int MIN_TIME_BW_UPDATES = 1000 * 3;
    private const int REQUEST_CHECK_SETTINGS = 9000;

        public async void OnConnected(Bundle connectionHint)
        {
            await CheckFusedApiSettings();
        }

        public void OnConnectionFailed(ConnectionResult result)
        {
            throw new NotImplementedException();
        }

        public void OnConnectionSuspended(int cause)
        {
            throw new NotImplementedException();
        }

        public void OnLocationChanged(Location location)
        {
            throw new NotImplementedException();
        }

        protected override void OnCreate(Bundle bundle)
        {
            TabLayoutResource = Resource.Layout.Tabbar;
            ToolbarResource = Resource.Layout.Toolbar;

            base.OnCreate(bundle);

            InitiateClient();
            InitiateRequests();

            global::Xamarin.Forms.Forms.Init(this, bundle);
            LoadApplication(new App());
        }

        protected override void OnStart()
        {
            base.OnStart();
            locationClient.Connect();
        }

        protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
        {
            base.OnActivityResult(requestCode, resultCode, data);
            if (requestCode == REQUEST_CHECK_SETTINGS)
            {
                switch (resultCode)
                {
                    case Result.Canceled:
                    Toast.MakeText(this, "RESULT CANCEL", ToastLength.Short).Show();
                        break;

                    case Result.Ok:
                        Toast.MakeText(this, "RESULT OK", ToastLength.Short).Show();
                        break;

                    case Result.FirstUser:
                    default:
                        break;
                }
            }
        }

        private void InitiateClient()
        {
            locationClient = new GoogleApiClient.Builder(this, this, this)
                            .AddApi(LocationServices.API)
                            .Build();
            locationClient.Connect();
        }
        private void InitiateRequests()
        {
            locationRequest = new LocationRequest();
            locationRequest.SetPriority(LocationRequest.PriorityHighAccuracy);
            locationRequest.SetFastestInterval(MIN_TIME_BW_UPDATES / 2);
            locationRequest.SetInterval(MIN_TIME_BW_UPDATES);

            LocationSettingsRequest.Builder settingsBuilder = new LocationSettingsRequest.Builder();
            settingsBuilder.AddLocationRequest(locationRequest);
            locationSettingsRequest = settingsBuilder.Build();
        }
        private async Task CheckFusedApiSettings()
        {
            var locationSettingsResult = await LocationServices.SettingsApi.CheckLocationSettingsAsync(locationClient, locationSettingsRequest);

            switch (locationSettingsResult.Status.StatusCode)
            {
                case LocationSettingsStatusCodes.Success:
                    Toast.MakeText(this, "SUCCESS", ToastLength.Short).Show();
                    break;

                case LocationSettingsStatusCodes.ResolutionRequired:
                    try
                    {
                        locationSettingsResult.Status.StartResolutionForResult(this, REQUEST_CHECK_SETTINGS);
                    }
                    catch (Exception e)
                    {
                        Toast.MakeText(this, "CANCEL: " + e.Message, ToastLength.Short).Show();
                    }
                    break;

                default:
                    locationClient.Disconnect();
                    break;
            }
        }
    }

Answer 1

如果您对上述问题感兴趣，请访问： https://forums.xamarin.com/discussion/comment/275171#Comment_275171 在经过7-8个月的努力之后，我已经得出了一个结论。

StartResolutionForResult总是在OnActivityResult中结束，resultCode = Result.Canceled

1 个答案: