Implement QR code scanning

QuickPlay/MainActivity.cs

@@ -7,6 +7,7 @@ using Android.Content;
 using Android.Support.V7.App;
 using Toolbar = Android.Support.V7.Widget.Toolbar;
 using GridLayoutManager = Android.Support.V7.Widget.GridLayoutManager;
+using Android.Runtime;
 
 namespace QuickPlay
 {
@@ -84,7 +85,13 @@ namespace QuickPlay
                     StartActivity(i);
                 });
                 b.SetNegativeButton("Scan QR", delegate {
-                    Toast.MakeText(this, "Not implemented :-(", ToastLength.Long).Show(); 
+                    try
+                    {
+                        var i = new Intent("com.google.zxing.client.android.SCAN");
+                        StartActivityForResult(i, 0);
+                    } catch (ActivityNotFoundException e) {
+                        Toast.MakeText(this, "You need ZXing Barcode scanner for this", ToastLength.Long).Show();
+                    }
                 });
                 b.SetCancelable(true);
 
@@ -169,5 +176,26 @@ namespace QuickPlay
 
             this.appConfig.saveConfiguration();
         }
+
+        protected override void OnActivityResult(int requestCode, [GeneratedEnum] Result resultCode, Intent data)
+        {
+            base.OnActivityResult(requestCode, resultCode, data);
+            if (requestCode == 0)
+            {
+                if (resultCode == Result.Ok)
+                {
+                    string url = data.GetStringExtra("SCAN_RESULT");
+                    var cfg = new AppConfiguration { playerConfigUrl = url };
+                    cfg.saveConfiguration();
+                    Toast.MakeText(this, "Configuration saved, reloading", ToastLength.Short).Show();
+                    var i = new Intent(this, typeof(MainActivity));
+                    StartActivity(i);
+                }
+                else if (resultCode == Result.Canceled)
+                {
+                    Toast.MakeText(this, "Could not load QR code", ToastLength.Short).Show();
+                }
+            }
+        }
     }
 }