如何獲取GPS或位置

我試過教程GPS，我收到以下錯誤消息。什麼似乎是問題？如何獲取GPS或位置

http://docs.xamarin.com/recipes/android/os_device_resources/gps/get_current_device_location

 
using System; 
using Android.App; 
using Android.Content; 
using Android.Runtime; 
using Android.Views; 
using Android.Widget; 
using Android.OS; 

//-- added these 


using Android.Locations; 
using System.Collections.Generic; 
using System.Threading; 
using System.Text; 


namespace GetLocation 
{ 

    [Activity(Label = "Get Location", MainLauncher = true, Icon = "@drawable/icon")] 
    public class Activity1 : Activity, ILocationListener 
    { 
     //int count = 1; 
     private Location _currentLocation; 
     private LocationManager _locationManager; 
     private TextView _locationText; 
     private TextView _addressText; 

     protected override void OnCreate (Bundle bundle) 
     { 
      base.OnCreate (bundle); 
      SetContentView(Resource.Layout.Main); 
      _addressText = FindViewById(Resource.Id.address_text); 
      _locationText = FindViewById(Resource.Id.location_text); 
      FindViewById(Resource.Id.get_address_button).Click += AddressButton_OnClick; 

      InitializeLocationManager();   
     } 

     //public void OnLocationChanged(Location location) {} 
     public void OnProviderDisabled(string provider) {} 
     public void OnProviderEnabled(string provider) {} 
     public void OnStatusChanged(string provider, Availability status, Bundle extras) {} 

     private void InitializeLocationManager() 
     { 
      _locationManager = (LocationManager) GetSystemService(LocationService); 
      var criteriaForLocationService = new Criteria 
      { 
       Accuracy = Accuracy.Fine 
      }; 
      var acceptableLocationProviders = _locationManager.GetProviders(criteriaForLocationService, true); 

      if (acceptableLocationProviders.Any()) 
      { 
       _locationProvider = acceptableLocationProviders.First(); 
      } 
      else 
      { 
       _locationProvider = String.Empty; 
      } 
     } 

     protected override void OnResume() 
     { 
      base.OnResume(); 
      _locationManager.RequestLocationUpdates(_locationProvider, 0, 0, this); 
     } 

     protected override void OnPause() 
     { 
      base.OnPause(); 
      _locationManager.RemoveUpdates(this); 
     } 

     private void AddressButton_OnClick(object sender, EventArgs eventArgs) 
     { 
      if (_currentLocation == null) 
      { 
       _addressText.Text = "Can't determine the current location."; 
       return; 
      } 
      new Thread(() => 
         { 
       var addressText = "Unable to find a location."; 
       var geocoder = new Geocoder(this); 
       var addressList = geocoder.GetFromLocation(_currentLocation.Latitude, _currentLocation.Longitude, 50); 
       var address = addressList.FirstOrDefault(); 

       if (address != null) 
       { 
        var deviceLocation = new StringBuilder(); 
        for (var i = 0; i { _addressText.Text = addressText; }); 
      }).Start(); 
     } 

     public void OnLocationChanged(Location location) 
     { 
      _currentLocation = location; 
      if (_currentLocation == null) 
      { 
       _locationText.Text = "Unable to determine your location."; 
      } 
      else 
      { 
       _locationText.Text = String.Format("{0},{1}", _currentLocation.Latitude, _currentLocation.Longitude); 
      } 
     } 
    } 
}

如何解決這些問題：

錯誤消息

1）

錯誤CS1061： 'System.Collections.Generic.IList' 不包含'Any'的定義，並且沒有擴展方法'Any'接受類型 'System.Collections.Generic.IList' 可以找到（是否缺少使用指令或程序集引用？）（CS1061）的第一參數（的getLocation）

2）Error CS0103: The name '_locationProvider' does not exist in the current context (CS0103) (GetLocation)

3）Error CS1061: 'System.Collections.Generic.IList<string>' does not contain a definition for 'First' and no extension method 'First' accepting a first argument of type 'System.Collections.Generic.IList<string>' could be found (are you missing a using directive or an assembly reference?) (CS1061) (GetLocation)

4）Error CS0103: The name '_locationProvider' does not exist in the current context (CS0103) (GetLocation)

5）Error CS1061: 'System.Collections.Generic.IList<Android.Locations.Address>' does not contain a definition for 'FirstOrDefault' and no extension method 'FirstOrDefault' accepting a first argument of type 'System.Collections.Generic.IList<Android.Locations.Address>' could be found (are you missing a using directive or an assembly reference?) (CS1061) (GetLocation)

6）不要緊，如果文件名是MainActivity.cs和活動課叫做：

public class Activity1 : Activity, ILocationListener 
{ 
}

感謝

來源

2013-05-16 MilkBottle

您是否試過本教程？它看起來不同於你的代碼，所以也許這會更好。 http://docs.xamarin.com/guides/android/platform_features/maps_and_location/part_3_-_location_services – jHogen

@jHogen：感謝您的鏈接。我添加了system.linq，system.xml並聲明瞭一個私有字符串_locationProvider（這是缺少的）。現在它沒有編譯錯誤，但沒有Gps，它說無法確定位置。我在模擬器上測試，可以提供默認的Gps嗎？ – MilkBottle

看看這個問題：http://stackoverflow.com/questions/2279647/how-to-emulate-gps-location-in-the-android-emulator – jHogen

使用的定義，「任何（）」你必須有「使用System.Linq的」。

希望有所幫助。

來源

2014-03-12 17:15:36 tackyshirt

如何獲取GPS或位置

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