Added methods for pausing/resuming camera

android/src/main/kotlin/net/touchcapture/qr/flutterqr/QRView.kt

@@ -87,6 +87,17 @@ class QRView(private val registrar: PluginRegistry.Registrar, id: Int) :
         barcodeView?.resume()
     }
 
+    private fun pauseCamera() {
+        if (barcodeView!!.isPreviewActive) {
+            barcodeView?.pause()
+        }
+    }
+
+    private fun resumeCamera() {
+        if (!barcodeView!!.isPreviewActive) {
+            barcodeView?.resume()
+        }
+    }
 
     override fun getView(): View {
         return initBarCodeView()?.apply {
@@ -147,6 +158,12 @@ class QRView(private val registrar: PluginRegistry.Registrar, id: Int) :
             "flipFlash" -> {
                 flipFlash()
             }
+            "pauseCamera" -> {
+                pauseCamera()
+            }
+            "resumeCamera" -> {
+                resumeCamera()
+            }
         }
     }
 

example/lib/main.dart

@@ -85,7 +85,31 @@ class _QRViewExampleState extends State<QRViewExample> {
                       ),
                     )
                   ],
-                )
+                ),
+                Row(
+                  mainAxisAlignment: MainAxisAlignment.spaceEvenly,
+                  crossAxisAlignment: CrossAxisAlignment.center,
+                  children: <Widget>[
+                    Container(
+                      margin: EdgeInsets.only(bottom: 8.0),
+                      child: RaisedButton(
+                        onPressed: () {
+                          controller?.pauseCamera();
+                        },
+                        child: Text('pause', style: TextStyle(fontSize: 20)),
+                      ),
+                    ),
+                    Container(
+                      margin: EdgeInsets.only(bottom: 8.0),
+                      child: RaisedButton(
+                        onPressed: () {
+                          controller.resumeCamera();
+                        },
+                        child: Text('resume', style: TextStyle(fontSize: 20)),
+                      ),
+                    )
+                  ],
+                ),
               ],
             ),
             flex: 1,

ios/Classes/QRView.swift

@@ -50,6 +50,10 @@ public class QRView:NSObject,FlutterPlatformView {
                     self?.flipCamera()
                 case "flipFlash":
                     self?.flipFlash()
+                case "pauseCamera":
+                    self?.pauseCamera()
+                case "resumeCamera":
+                    self?.resumeCamera()
                 default:
                     result(FlutterMethodNotImplemented)
                     return
@@ -79,4 +83,20 @@ public class QRView:NSObject,FlutterPlatformView {
             }
         }
     }
+    
+    func pauseCamera() {
+        if let sc: MTBBarcodeScanner = scanner {
+            if sc.isScanning() {
+                sc.freezeCapture()
+            }
+        }
+    }
+    
+    func resumeCamera() {
+        if let sc: MTBBarcodeScanner = scanner {
+            if !sc.isScanning() {
+                sc.unfreezeCapture()
+            }
+        }
+    }
 }

lib/qr_code_scanner.dart

@@ -83,12 +83,19 @@ class QRViewController {
     }
   }
 
-  void flipCamera(){
+  void flipCamera() {
     channel.invokeMethod("flipCamera");
   }
 
-  void flipFlash(){
+  void flipFlash() {
     channel.invokeMethod("flipFlash");
   }
 
+  void pauseCamera() {
+    channel.invokeMethod("pauseCamera");
+  }
+
+  void resumeCamera() {
+    channel.invokeMethod("resumeCamera");
+  }
 }