获得用户对权限的响应时无法恢复活动

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【中文标题】获得用户对权限的响应时无法恢复活动【英文标题】：Unable to resume activity when getting users response for permission 【发布时间】：2017-01-19 00:07:19 【问题描述】：

我正在尝试获得用户访问其 GPS 的权限。我不确定我是否正确使用了它，因为当我访问该屏幕时，我会因错误而崩溃：

java.lang.RuntimeException: Unable to resume activity com.SuppShoesTest.SuppShoesTest/md5056fe371b3902b2cc984ad5dda4f920b.gMaps: android.util.SuperNotCalledException: Activity com.SuppShoesTest.SuppShoesTest/md5056fe371b3902b2cc984ad5dda4f onResume() 01-18 23:57:20.419 E/AndroidRuntime(2712): 在 android.app.ActivityThread.performResumeActivity(ActivityThread.java:3103) 01-18 23:57:20.419 E/AndroidRuntime(2712): 在 android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3134) 01-18 23:57:20.419 E/AndroidRuntime(2712): 在 android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2481) 01-18 23:57:20.419 E/AndroidRuntime(2712): 在 android.app.ActivityThread.-wrap11(ActivityThread.java) 01-18 23:57:20.419 E/AndroidRuntime(2712): 在 android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 01-18 23:57:20.419 E/AndroidRuntime（2712）：在 android.os.Handler.dispatchMessage（Handler.java:102） 01-18 23:57:20.419 E/AndroidRuntime（2712）：在 android.os.Looper.loop（Looper.java:148） 01-18 23:57:20.419 E/AndroidRuntime(2712): 在 android.app.ActivityThread.main(ActivityThread.java:5417) 01-18 23:57:20.419 E/AndroidRuntime（2712）：在 java.lang.reflect.Method.invoke（本机方法） 01-18 23:57:20.419 E/AndroidRuntime（2712）：在 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run（ZygoteInit.java:726） 01-18 23:57:20.419 E/AndroidRuntime（2712）：在 com.android.internal.os.ZygoteInit.main（ZygoteInit.java:616） 01-18 23:57:20.419 E/AndroidRuntime（2712）：引起：android.util.SuperNotCalledException：活动 com.SuppShoesTest.SuppShoesTest/md5056fe371b3902b2cc984ad5dda4f920b.gMaps 没有调用到 super.onResume() 01-18 23:57:20.419 E/AndroidRuntime(2712): 在 android.app.Activity.performResume(Activity.java:6314) 01-18 23:57:20.419 E/AndroidRuntime(2712): 在 android.app.ActivityThread.performResumeActivity(ActivityThread.java:3092)

这是我的代码


    private GoogleMap maps;
    string dman;
    string date;
    string time;
    public static readonly EndpointAddress EndPoint = new EndpointAddress("http://192.168.1.3:9608/SuppShoes.svc");
    private SuppShoesClient _client;
    ArrayList postal;
    double mylat;
    double mylong;
    Location _currentLocation;
    LocationManager _locationManager;
    LinearLayout layout;
    string _locationProvider;
    PolylineOptions rect = new PolylineOptions();
    readonly string[] PermissionsLocation = 

  Manifest.Permission.AccessCoarseLocation,
  Manifest.Permission.AccessFineLocation
;

    const int RequestLocationId = 0;
    protected override void OnCreate(Bundle savedInstanceState)
    

        base.OnCreate(savedInstanceState);

        SetContentView(Resource.Layout.gMap);
        layout = (LinearLayout)FindViewById(Resource.Id.layout);
        InitializeHelloWorldServiceClient();
        dman = Intent.GetStringExtra("Dman");
        date = Intent.GetStringExtra("date");
        time = Intent.GetStringExtra("Time");
        InitializeLocationManager(); 
        SetUpMap();


        // Create your application here
    

    private void InitializeHelloWorldServiceClient()
    


        BasicHttpBinding binding = CreateBasicHttp();
        _client = new SuppShoesClient(binding, EndPoint);


    

    private static BasicHttpBinding CreateBasicHttp()
    
        BasicHttpBinding binding = new BasicHttpBinding
        
            Name = "basicHttpBinding",
            MaxBufferSize = 2147483647,
            MaxReceivedMessageSize = 2147483647
        ;
        TimeSpan timeout = new TimeSpan(0, 0, 30);
        binding.SendTimeout = timeout;
        binding.OpenTimeout = timeout;
        binding.ReceiveTimeout = timeout;
        return binding;
    

    public async void OnLocationChanged(Location location)
    
        _currentLocation = location;
        if (_currentLocation == null)
        

        
        else
        

            AddMarker();
        

    
    public void OnProviderDisabled(string provider)  

    public void OnProviderEnabled(string provider)  

    public void OnStatusChanged(string provider, Availability status, Bundle extras)  




    protected override void OnResume()
    


            const string permission = Manifest.Permission.AccessFineLocation;
            if (CheckSelfPermission(permission) == (int)Permission.Granted)
            
                base.OnResume();
                _locationManager.RequestLocationUpdates(_locationProvider, 0, 0, this);

            
        if (ShouldShowRequestPermissionRationale(permission))
              

                //Explain to the user why we need to read the contacts
                  Android.Support.Design.Widget.Snackbar.Make(layout,"Location access is required to show coffee shops nearby.", Android.Support.Design.Widget.Snackbar.LengthIndefinite)
                        .SetAction("OK", v => RequestPermissions(PermissionsLocation, RequestLocationId))
                        .Show();
                return;

//最后用权限列表和Id请求权限 RequestPermissions(PermissionsLocation, RequestLocationId); 

                    public override async void OnRequestPermissionsResult(int requestCode, string[] permissions, Permission[] grantResults)
                    
                      switch (requestCode)
                      
                        case RequestLocationId:
                        
                          if (grantResults[0] == Permission.Granted)
                          
                            //Permission granted
                              var snack = Android.Support.Design.Widget.Snackbar.Make(layout, "Location permission is available, getting lat/long.", Android.Support.Design.Widget.Snackbar.LengthShort);
                            snack.Show();

                            base.OnResume();
                          
                          else
                          
                            //Permission Denied :(
                            //Disabling location functionality
                              var snack = Android.Support.Design.Widget.Snackbar.Make(layout, "Location permission is denied.",  Android.Support.Design.Widget.Snackbar.LengthShort);
                            snack.Show();
                          
                        
                        break;
                      
                    
    protected override void OnPause()
    
        base.OnPause();
        _locationManager.RemoveUpdates(this);
    
    void InitializeLocationManager()
    
        _locationManager = (LocationManager)GetSystemService(LocationService);
        Criteria criteriaForLocationService = new Criteria
        
            Accuracy = Accuracy.Fine
        ;
        IList<string> acceptableLocationProviders = _locationManager.GetProviders(criteriaForLocationService, true);

        if (acceptableLocationProviders.Any())
        
            _locationProvider = acceptableLocationProviders.First();
        
        else
        
            _locationProvider = string.Empty;
        

    

    void AddMarker()
    
        RunOnUiThread(() =>
        
            LatLng current = new LatLng(_currentLocation.Latitude, _currentLocation.Longitude);
            MarkerOptions asd = new MarkerOptions();

            asd.SetPosition(current);

            asd.InvokeIcon(BitmapDescriptorFactory.FromResource(Resource.Drawable.green));
            maps.AddMarker(asd);
            rect.Add(current);
        );
    
    private void SetUpMap()
    
        if(maps==null)
        
            FragmentManager.FindFragmentById<MapFragment>(Resource.Id.googlemap).GetMapAsync(this);
        

    
    public void OnMapReady(GoogleMap googleMap)
    
        this.maps = googleMap;

        LatLng latlng = new LatLng(Convert.ToDouble(1.3521), Convert.ToDouble(103.8198));
        CameraUpdate camera = CameraUpdateFactory.NewLatLngZoom(latlng,10);
        maps.MoveCamera(camera);

        _client.getPostalAsync(dman, date, time);
        _client.getPostalCompleted += _client_getPostalCompleted;
    


    private void _client_getPostalCompleted(object sender, getPostalCompletedEventArgs e)
    

        RunOnUiThread(() =>
        


        foreach (var item in e.Result)
        


            LatLng latlng = new LatLng(item.lat1, item.longi2);
            MarkerOptions options = new MarkerOptions()    
            .SetPosition(latlng)
            .SetTitle(item.companyname2)
            .SetSnippet(item.DevID.ToString());
            maps.AddMarker(options);
            rect.Add(latlng);
            Polyline polyline = maps.AddPolyline(rect);
        
    );

【问题讨论】：

【参考方案1】：

对于 Xamarin 表单，需要调用 base.OnResume() 以避免此异常。与往常一样，这需要位于重写的 OnResume() 方法的顶部。

【讨论】：

【参考方案2】：

正如您的异常 Caused by: android.util.SuperNotCalledException 所明确的那样，您必须添加 super.onResume() 才能执行恢复生命周期，因为您是 @Overriding 方法。

在onResume();内致电super：

super.onResume();

【讨论】：

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