Google Karte Geocoder und MoveToRegion funktioniert nicht

Question

Ich habe ein sehr seltsames Problem mit Xamarin.Forms.Maps. Ich versuche, eine Seite mit einer Karte zu implementieren, die den aktuellen Standort abruft und beim Start der Seite in die Region wechselt.

Alles funktioniert gut in IOS, aber in Android, Geocoder & MoveToRegion funktionieren überhaupt nicht. Nur die Karte wird angezeigt.

Ich erhalte den Standort korrekt (Long & Lat) in den Emulatoren & Gerät. MoveToRegion nichts tun & GetAddressesForPositionAsync retrive nichts.

Hier sind die Informationen in meinem Manifest:

<meta-data android:name="com.google.android.maps.v2.API_KEY" android:value="mykey" /> 
     <meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" /> 

<uses-permission android:name="android.permission.INTERNET" /> 
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" /> 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> 
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> 
<uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS" /> 
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" /> 
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> 

Hier den Code:

map.MoveToRegion(MapSpan.FromCenterAndRadius(
       new Xamarin.Forms.Maps.Position(coordinates.Lat.Value, coordinates.Lng.Value), Distance.FromMiles(1)) 
      ); 

     var possibleAddresses = await locator.GetAddressesForPositionAsync(position); 

Ich habe versucht, in Genymotion, Emulator von AVD. Ich bin nicht in der Lage in Echt Gerät zu testen (Der Einsatz in meinem Tablet scheitern)

Edit:

global::Xamarin.Forms.Forms.Init(this, bundle); 

War richtig eingestellt, aber immer noch nicht funktioniert.

Ich zwinge Geocoder Nutzung und es diesen Fehler ausgelöst:

[MonoDroid] UNHANDLED EXCEPTION: 
[MonoDroid] Java.IO.IOException: grpc failed 
[MonoDroid] at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() [0x0000c] in <896ad1d315ca4ba7b117efb8dacaedcf>:0 
[MonoDroid] at Java.Interop.JniEnvironment+InstanceMethods.CallObjectMethod (Java.Interop.JniObjectReference instance, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args) [0x00069] in <6cd960837cc24c26bab2a0a29b597627>:0 
[MonoDroid] at Java.Interop.JniPeerMembers+JniInstanceMethods.InvokeAbstractObjectMethod (System.String encodedMember, Java.Interop.IJavaPeerable self, Java.Interop.JniArgumentValue* parameters) [0x00014] in <6cd960837cc24c26bab2a0a29b597627>:0 
[MonoDroid] at Android.Locations.Geocoder.GetFromLocationName (System.String locationName, System.Int32 maxResults) [0x0003c] in <d278c06ad5684d6882c743a94a93ebc2>:0 
[MonoDroid] at Android.Locations.Geocoder+<>c__DisplayClass17_0.<GetFromLocationNameAsync>b__0() [0x00000] in <d278c06ad5684d6882c743a94a93ebc2>:0 
[MonoDroid] at System.Threading.Tasks.Task`1[TResult].InnerInvoke() [0x0000f] in <896ad1d315ca4ba7b117efb8dacaedcf>:0 
[MonoDroid] at System.Threading.Tasks.Task.Execute() [0x00010] in <896ad1d315ca4ba7b117efb8dacaedcf>:0 
[MonoDroid] --- End of stack trace from previous location where exception was thrown --- 
[MonoDroid] at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() [0x0000c] in <896ad1d315ca4ba7b117efb8dacaedcf>:0 
[MonoDroid] at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x0003e] in <896ad1d315ca4ba7b117efb8dacaedcf>:0 
[MonoDroid] at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in <896ad1d315ca4ba7b117efb8dacaedcf>:0 
[MonoDroid] at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in <896ad1d315ca4ba7b117efb8dacaedcf>:0 
[MonoDroid] at System.Runtime.CompilerServices.TaskAwaiter`1[TResult].GetResult() [0x00000] in <896ad1d315ca4ba7b117efb8dacaedcf>:0 
[MonoDroid] at Xamarin.Forms.Maps.Android.GeocoderBackend+<GetPositionsForAddressAsync>d__1.MoveNext() [0x0006b] in <39c694c022be4f7b8a39897d372b2d00>:0 
[MonoDroid] --- End of stack trace from previous location where exception was thrown --- 
[MonoDroid] at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() [0x0000c] in <896ad1d315ca4ba7b117efb8dacaedcf>:0 
[MonoDroid] at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x0003e] in <896ad1d315ca4ba7b117efb8dacaedcf>:0 
[MonoDroid] at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in <896ad1d315ca4ba7b117efb8dacaedcf>:0 
[MonoDroid] at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in <896ad1d315ca4ba7b117efb8dacaedcf>:0 
[MonoDroid] at System.Runtime.CompilerServices.TaskAwaiter`1[TResult].GetResult() [0x00000] in <896ad1d315ca4ba7b117efb8dacaedcf>:0 
[MonoDroid] at Picaplant.Views.GeolocationPage+<HandleAdressCompleted>d__8.MoveNext() [0x00047] in /Users/OrcusZ/Documents/AutoEntrepreneur/Picaplant/Source/Picaplant/Views/GeolocationPage.xaml.cs:158 
[MonoDroid] --- End of stack trace from previous location where exception was thrown --- 
[MonoDroid] at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() [0x0000c] in <896ad1d315ca4ba7b117efb8dacaedcf>:0 
[MonoDroid] at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.<ThrowAsync>b__6_0 (System.Object state) [0x00000] in <896ad1d315ca4ba7b117efb8dacaedcf>:0 
[MonoDroid] at Android.App.SyncContext+<>c__DisplayClass2_0.<Post>b__0() [0x00000] in <d278c06ad5684d6882c743a94a93ebc2>:0 
[MonoDroid] at Java.Lang.Thread+RunnableImplementor.Run() [0x00008] in <d278c06ad5684d6882c743a94a93ebc2>:0 
[MonoDroid] at Java.Lang.IRunnableInvoker.n_Run (System.IntPtr jnienv, System.IntPtr native__this) [0x00008] in <d278c06ad5684d6882c743a94a93ebc2>:0 
[MonoDroid] at (wrapper dynamic-method) System.Object:6621ff63-14b8-4291-a222-45bff630bddc (intptr,intptr) 
[MonoDroid] --- End of managed Java.IO.IOException stack trace --- 
[MonoDroid] java.io.IOException: grpc failed 
[MonoDroid]  at android.location.Geocoder.getFromLocationName(Geocoder.java:178) 
[MonoDroid] 

EDIT 2:

gleiche Fehler mit Xamarin Formular mit Karten Probe Arbeits

Jede Idee?

Answer 1

Hier ist eine funktionierende Cross-Plattform-Beispiel-App. Es läuft in einem KitKat 4.4 API Level 19 Emulator und auch in einem Samsung Android Gerät. Wir präsentieren auch eine benutzerdefinierte Geocoder Implementierung mit HTTP-Anforderungen, vorausgesetzt, dass die Standard-Funktion für ein tatsächliches Android-Gerät funktioniert, aber eine leere Antwort für den Emulator zurückgibt.

XAML:

<?xml version="1.0" encoding="utf-8" ?> 
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" 
      xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" 
      xmlns:Maps="clr-namespace:Xamarin.Forms.Maps;assembly=Xamarin.Forms.Maps.dll" 
      xmlns:local="clr-namespace:App20" 
      x:Class="App20.MainPage"> 
    <ContentPage.Content> 
     <Grid> 
      <Grid.RowDefinitions> 
       <RowDefinition Height="8*"></RowDefinition> 
       <RowDefinition Height="4*"></RowDefinition> 
       <RowDefinition Height="*"></RowDefinition> 
       <RowDefinition Height="*"></RowDefinition> 
      </Grid.RowDefinitions> 

      <Maps:Map x:Name="map1" Grid.Row="0"></Maps:Map> 
      <ListView ItemsSource="{Binding AddressList}" Grid.Row="1" /> 
      <Button Text="Move To Region" Grid.Row="2" Clicked="Button_Clicked_Move"></Button> 
      <Button Text="Get Address" Grid.Row="3" Clicked="Button_Clicked_Address"></Button> 
     </Grid> 
    </ContentPage.Content> 
</ContentPage> 

CS:

public partial class MainPage : ContentPage 
{ 
    MyViewModel vm; 

    public MainPage() 
    { 
     InitializeComponent(); 

     vm = new MyViewModel(); 
     BindingContext = vm; 
    } 

    private void Button_Clicked_Move(object sender, EventArgs e) 
    { 
     map1.MoveToRegion(MapSpan.FromCenterAndRadius(
      new Position(vm.Lat, vm.Lon), Distance.FromMiles(vm.Distance))); 
    } 

    private async void Button_Clicked_Address(object sender, EventArgs e) 
    { 
     Geocoder gc = new Geocoder(); 

     var list = await gc.GetAddressesForPositionAsync(new Position(vm.Lat, vm.Lon)); 

     if (list.Count() > 0) 
     { 
      foreach (string s in list) 
       vm.AddressList.Add(s); 
     } 
     else 
     { 
      MyGeocoder mgc = new MyGeocoder(); 

      var mylist = await mgc.GetAddressesForPositionAsync(vm.Lat, vm.Lon, vm.Key); 

      foreach (string s in mylist) 
       vm.AddressList.Add(s); 
     } 
    } 
} 

Ansicht Modell:

Geocoder 0

public class MyViewModel 
{ 
    public string Key { get; } 
    public double Lat { get; set; } 
    public double Lon { get; set; } 
    public double Distance { get; set; } 
    public ObservableCollection<string> AddressList { get; set; } 

    public MyViewModel() 
    { 
     Lat = 40.706501; 
     Lon = -74.011340; 
     Distance = 0.5; 
     Key = "YOUR_API_KEY"; 
     AddressList = new ObservableCollection<string>(); 
    } 
} 

Gewohnheit:

public class MyGeocoder 
{ 
    public async Task<IEnumerable<string>> GetAddressesForPositionAsync(double lat, double lon, string key) 
    { 
     HttpClient client = new HttpClient(); 

     var request = string.Format(@"https://maps.googleapis.com/maps/api/geocode/json?latlng={0},{1}&key={2}", lat, lon, key); 

     var json = await client.GetStringAsync(request); 

     var result = JObject.Parse(json)["results"]; 

     List<string> list = new List<string>(); 

     foreach (JToken jt in result) 
      list.Add((string)jt["formatted_address"]); 

     return list.AsEnumerable<string>(); 
    } 
}