C＃MonoDroid的/ Xamarin - 位置服务java.lang.IllegalArgumentException异常

摘要C＃MonoDroid的/ Xamarin - 位置服务java.lang.IllegalArgumentException异常

I AM这段代码运行在真实设备上，而不是一个模拟器。

我已经经历了Xamarin MonoDroid的位置服务教程 - 在下面的代码行HERE

当我编译代码我得到一个“java.lang.IllegalArgumentException异常” -

protected override void OnResume() 
     { 
      base.OnResume(); 
      _locationManager.RequestLocationUpdates(_locationProvider, 0, 0, this); 
      Log.Debug(LogTag, "Listening for location updates using " + _locationProvider + "."); 
     }

向下钻取异常揭示了以下 -

Java.Lang.IllegalArgumentException: provider= 
    at Android.Runtime.JNIEnv.CallVoidMethod (intptr,intptr,Android.Runtime.JValue[]) [0x00023] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.8.2-branch/a25a31d0/source/monodroid/src/Mono.Android/src/Runtime/JNIEnv.g.cs:368 
    at Android.Locations.LocationManager.RequestLocationUpdates (string,long,single,Android.Locations.ILocationListener) [0x0004a] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.8.2-branch/a25a31d0/source/monodroid/src/Mono.Android/platforms/android-10/src/generated/Android.Locations.LocationManager.cs:814 
    at com.xamarin.recipes.getlocation.Activity1.OnResume() [0x0001b] in /Users/SimonGilbert/Downloads/GetLocation/Activity1.cs:86 
    at Android.App.Activity.n_OnResume (intptr,intptr) [0x00009] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.8.2-branch/a25a31d0/source/monodroid/src/Mono.Android/platforms/android-10/src/generated/Android.App.Activity.cs:2596 
    at at (wrapper dynamic-method) object.383877df-2ff3-46a8-906d-6d9bd2915e69 (intptr,intptr) <IL 0x00011, 0x0001b> 
    at 
    at --- End of managed exception stack trace --- 
    at java.lang.IllegalArgumentException: provider= 
    at at android.os.Parcel.readException(Parcel.java:1331) 
    at at android.os.Parcel.readException(Parcel.java:1281) 
    at at android.location.ILocationManager$Stub$Proxy.requestLocationUpdates(ILocationManager.java:646) 
    at at android.location.LocationManager._requestLocationUpdates(LocationManager.java:614) 
    at at android.location.LocationManager.requestLocationUpdates(LocationManager.java:478) 
    at at com.xamarin.recipes.getlocation.Activity1.n_onResume(Native Method) 
    at at com.xamarin.recipes.getlocation.Activity1.onResume(Activity1.java:43) 
    at at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1154) 
    at at android.app.Activity.performResume(Activity.java:4540) 
    at at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2437) 
    at at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2475) 
    at at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1989) 
    at at android.app.ActivityThread.access$600(ActivityThread.java:124) 
    at at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1148) 
    at at android.os.Handler.dispatchMessage(Handler.java:99) 
    at at android.os.Looper.loop(Looper.java:137) 
    at at android.app.ActivityThread.main(ActivityThread.java:4436) 
    at at java.lang.reflect.Method.invokeNative(Native Method) 
    at at java.lang.reflect.Method.invoke(Method.java:511) 
    at at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
    at at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
    at at dalvik.system.NativeStart.main(Native Method) 
    at

问题

有没有人见过这个？
任何关于它可能导致它的想法？

UPDATE

从阅读周围，好像加入下面可以解决我的问题，虽然我还没有机会尚未对其进行测试 -
```
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> 
```

似乎另一种解决方案可能是检查网络提供商是否也可用 -

locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 300000, 500, locationListener);

也许还检查GPS提供商可太 -

locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 300000, 500, locationListener);

非常感谢。

来源

2013-11-01 Goober

你试过选择最好的提供者？像这样：http://stackoverflow.com/a/15679274/851490 – Roosevelt

传递一个空标准集合，并在AssemblyInfo文件中设置权限。

LocationManager mgr = (LocationManager) GetSystemService(LOCATION_SERVICE); 
Criteria criteria = new Criteria(); 
String best = mgr.GetBestProvider(criteria, true); 
//since you are using true as the second parameter, you will only get the best of providers which are enabled. 
Location location = mgr.GetLastKnownLocation(best); 

<uses-permission android:name="android.permission.NETWORK" />

来源

2013-11-06 12:52:51 Goober

我已经在一些不同的方式进行，在OnCreate中

btnDone = FindViewById<Button> (Resource.Id.btnDone); 
     LocationManager LC=(LocationManager) GetSystemService(Context.LocationService); 
     Criteria criteria=new Criteria(); 
     string provider=LC.GetBestProvider(criteria, true); 
     Location loc=LC.GetLastKnownLocation(provider); 
`btnDone.Click += delegate { 
OnLocationChanged(loc); 
} 

// outside OnCreate 
public void OnLocationChanged(Location location) { 

     double lattitude = location.Latitude; 
     double longitude = location.Longitude; 
     Toast.MakeText (this, "Lattitude and Longitude is "+lattitude.ToString()+" and "+longitude.ToString(), ToastLength.Long).Show(); 
    }

也实现ILocationListener。提到这个 http://docs.xamarin.com/recipes/android/os_device_resources/gps/get_current_device_location/``

来源

2014-05-06 12:55:26 Cool7

C＃MonoDroid的/ Xamarin - 位置服务java.lang.IllegalArgumentException异常

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