错误的java.lang.IllegalArgumentException异常：供应商== NULL

我发表我的应用程序到Android市场。我在主页上有错误。有人写了崩溃的错误。但这个应用程序是完全在我真正的工作设备。我添加的权限也。我的错误：

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.karthi.locationspeecher/com.android.locationspeecher.LocationSpeecher}: java.lang.IllegalArgumentException: provider==null
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
at android.app.ActivityThread.access$1500(ActivityThread.java:117)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3687)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalArgumentException: provider==null
at android.location.LocationManager.getLastKnownLocation(LocationManager.java:1017)
at com.android.locationspeecher.LocationSpeecher.onCreate(LocationSpeecher.java:84)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
... 11 more

的LocationManager：

 LocationManager locationManager; 
            String context = Context.LOCATION_SERVICE; 
            locationManager = (LocationManager)getSystemService(context); 

            Criteria crta = new Criteria(); 
            crta.setAccuracy(Criteria.ACCURACY_FINE); 
            crta.setAltitudeRequired(false); 
            crta.setBearingRequired(false); 
            crta.setCostAllowed(true); 
            crta.setPowerRequirement(Criteria.POWER_LOW); 
            String provider = locationManager.getBestProvider(crta, true); 

         // String provider = LocationManager.GPS_PROVIDER; 
            Location location = locationManager.getLastKnownLocation(provider); 
            updateWithNewLocation(location); 

            locationManager.requestLocationUpdates(provider, 2000, 10, locationListener); 
            }

Answer 1:

你是最有可能得到这个错误，由于未可用性GPS Providers 。请询问的人，如果要检查设置Gps Provider或Network Provider已启用到位置设置。

Answer 2:

同时一定要增加android.permission.ACCESS_FINE_LOCATION或android.permission.ACCESS_COARSE_LOCATION到您的清单文件，这解决了这个问题对我来说（所有供应商的位置设置已经启用）。

Answer 3:

我解决了这个加入：

`[组件：UsesPermission（Manifest.Permission.AccessFineLocation）] [组件：UsesPermission（Manifest.Permission.AccessCoarseLocation）] [组件：UsesPermission（Manifest.Permission.Internet）]”

在assemlyInfo.cs赋予权限