MVVMCross IMvxGeoLocationWatcher 成功操作永远不会在 Android 上触发 [英] MVVMCross IMvxGeoLocationWatcher Success Action never fires on Android

问题描述

我创建了一个非常简单的测试应用程序来尝试将我当前的纬度/经度反向地理编码为地址.

I created a very simple test app to try and reverse geocode my current lat/long into an address.

这是我的 ViewModel 的代码:

Here is the code for my ViewModel:

namespace LoginProductsMVVM.Core.ViewModels
{
    public class ProductDetailViewModel
        : MvxViewModel
    {
        public void Init(Product product)
        {
            Product = product;
        }

        private Product _product;
        public Product Product
        {
            get { return _product; }
            set { _product = value;
                RaisePropertyChanged (() => Product); }
        }

        private string _latitude;
        public string Latitude{
            get { return _latitude; }
            set { _latitude = value; RaisePropertyChanged(() => Latitude); }
        }

        private string _longitude;
        public string Longitude{
            get { return _longitude; }
            set { _longitude = value; RaisePropertyChanged(() => Longitude); }
        }

        private string _address;
        public string Address{
            get { return _address; }
            set { _address = value; RaisePropertyChanged(() => Address); }
        }

        private IMvxGeoLocationWatcher _watcher;
        public IMvxGeoLocationWatcher Watcher
        {
            get 
            {
                _watcher = Mvx.Resolve<IMvxGeoLocationWatcher> ();
                return _watcher;
            }
        }

        public ProductDetailViewModel(IMvxGeoLocationWatcher watcher)
        {
            _watcher = watcher;
            _watcher.Start (new MvxGeoLocationOptions (), OnLocation, OnError);
        }

        void OnLocation (MvxGeoLocation location)
        {
            Latitude = location.Coordinates.Latitude.ToString();
            Longitude = location.Coordinates.Longitude.ToString();

            // Android Location specific stuff
            var activity = Mvx.Resolve<IMvxAndroidCurrentTopActivity> ().Activity;
            Geocoder geocdr = new Geocoder (activity.BaseContext);

            IList<Address> addresses = geocdr.GetFromLocation (double.Parse(Latitude), double.Parse(Longitude), 1);

            addresses.ToList().ForEach ((addr) => Address += addr.ToString() + "

");
        }

        void OnError (MvxLocationError error)
        {
            Mvx.Error ("Seen location error {0}", error);
        }
    }
}

我的 OnLocation 方法中有一个断点，但它从未进入那里.我是否缺少某些东西才能在 Android 上正常工作?它似乎适用于 iOS...

I have a break point in my OnLocation method but it never gets in there. Am I missing something for this to work properly on Android? It appears to work just fine for iOS...

推荐答案

Per Odahan 此处:

Per Odahan here:

嗯...我调查了更多:这个问题是已知的，可以在许多设备上看到.这不是 MvvmCross 问题.简短回答:设备需要重新启动，并且一切都像魅力一样工作......似乎谷歌发送了一些导致问题的更新.这是一个讨论这个问题的线程和一个关于 GeoCode 类的类似问题:

Well... I investigated a bit more : The problem is known and can be seen on many devices. This is not a MvvmCross problem. Short answer : the device needs to be rebooted and all is working like a charm... It seems Google sent some updates that are causing the problem. Here is a thread speaking about this problem and a similar one concerning the GeoCode class :

https://code.google.com/p/android/问题/详细信息?id=38009

所以:可以关闭，MvvmCross 没问题，但其他人可能会遇到这个错误，所以我的解释和链接在这里.

So : can be closed, MvvmCross is ok but others can face this bug so my explanations and the link here.

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