Xamarin android permissions

MainActivity.cs

/* you need the xamarin permissions to use this /*

static readonly int REQUEST_WRITESETTINGS = 2, REQUEST_EXTERNAL = 4, REQUEST_WIFI = 5, REQUEST_WAKELOCK = 6, REQUEST_CONTACTS;

        static string[] PERMISSIONS_SETTINGS = { Manifest.Permission.WriteSettings };
        static string[] PERMISSIONS_STORAGE = { Manifest.Permission_group.Storage };
        static string[] PERMISSIONS_WIFISTATE = { Manifest.Permission.AccessWifiState };
        static string[] PERMISSIONS_WAKELOCK = { Manifest.Permission.WakeLock };
        static string[] PERMISSIONS_CONTACTS = { Manifest.Permission.ReadContacts };

        Android.Views.View layout;

        public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
        {
            PermissionsImplementation.Current.OnRequestPermissionsResult(requestCode, permissions, grantResults);
            base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
        }
        
   // inside OnCreate - if your app is a Xam Forms one, add after LoadApplication, otherwise, set it close to the start of the method
   
   if (Build.VERSION.SdkInt >= BuildVersionCodes.M)
            {
                RequestWriteSettingsPermission();
                RequestExternal();
                RequestWifi();
                RequestWakelock();
                RequestContacts();
            }
            
    // the following is general for the above method calls
    
    void RequestWakelock()
        {
            if (ActivityCompat.ShouldShowRequestPermissionRationale(this, /*whatever permission you're after - it'll be the same as the requested ones in the static strings*/))
            {
                Console.WriteLine("Show wake");
                Snackbar.Make(GetSnackbarAnchorView(), Resource.String./*insert your string here*/,
                              Snackbar.LengthIndefinite).SetAction("OK", v => ActivityCompat.RequestPermissions(this, /*string permission request*/, /*int request*/)).Show();
            }
            else
            {
                // Contact permissions have not been granted yet. Request them directly.
                ActivityCompat.RequestPermissions(this, /*string permission request*/, /*int request*/);
            }
        }

        Android.Views.View GetSnackbarAnchorView()
        {
            var a = this;
            var v3 = a.FindViewById(Android.Resource.Id.Content);
            return v3;
        }