Add pausing and resuming to example app

packages/camera/example/lib/main.dart

@@ -206,6 +206,19 @@ class _CameraExampleHomeState extends State<CameraExampleHome>
               ? onVideoRecordButtonPressed
               : null,
         ),
+        IconButton(
+          icon: controller != null && controller.value.isRecordingPaused
+              ? Icon(Icons.play_arrow)
+              : Icon(Icons.pause),
+          color: Colors.blue,
+          onPressed: controller != null &&
+                  controller.value.isInitialized &&
+                  controller.value.isRecordingVideo
+              ? (controller != null && controller.value.isRecordingPaused
+                  ? onResumeButtonPressed
+                  : onPauseButtonPressed)
+              : null,
+        ),
         IconButton(
           icon: const Icon(Icons.stop),
           color: Colors.red,
@@ -308,6 +321,20 @@ class _CameraExampleHomeState extends State<CameraExampleHome>
     });
   }
 
+  void onPauseButtonPressed() {
+    pauseVideoRecording().then((_) {
+      if (mounted) setState(() {});
+      showInSnackBar('Video recording paused');
+    });
+  }
+
+  void onResumeButtonPressed() {
+    resumeVideoRecording().then((_) {
+      if (mounted) setState(() {});
+      showInSnackBar('Video recording resumed');
+    });
+  }
+
   Future<String> startVideoRecording() async {
     if (!controller.value.isInitialized) {
       showInSnackBar('Error: select a camera first.');
@@ -349,6 +376,32 @@ class _CameraExampleHomeState extends State<CameraExampleHome>
     await _startVideoPlayer();
   }
 
+  Future<void> pauseVideoRecording() async {
+    if (!controller.value.isRecordingVideo) {
+      return null;
+    }
+
+    try {
+      await controller.pauseVideoRecording();
+    } on CameraException catch (e) {
+      _showCameraException(e);
+      return null;
+    }
+  }
+
+  Future<void> resumeVideoRecording() async {
+    if (!controller.value.isRecordingVideo) {
+      return null;
+    }
+
+    try {
+      await controller.resumeVideoRecording();
+    } on CameraException catch (e) {
+      _showCameraException(e);
+      return null;
+    }
+  }
+
   Future<void> _startVideoPlayer() async {
     final VideoPlayerController vcontroller =
         VideoPlayerController.file(File(videoPath));

packages/camera/lib/camera.dart

@@ -130,14 +130,17 @@ class CameraValue {
     this.isRecordingVideo,
     this.isTakingPicture,
     this.isStreamingImages,
-  });
+    bool isRecordingPaused,
+  }) : _isRecordingPaused = isRecordingPaused;
 
   const CameraValue.uninitialized()
       : this(
-            isInitialized: false,
-            isRecordingVideo: false,
-            isTakingPicture: false,
-            isStreamingImages: false);
+          isInitialized: false,
+          isRecordingVideo: false,
+          isTakingPicture: false,
+          isStreamingImages: false,
+          isRecordingPaused: false,
+        );
 
   /// True after [CameraController.initialize] has completed successfully.
   final bool isInitialized;
@@ -151,6 +154,11 @@ class CameraValue {
   /// True when images from the camera are being streamed.
   final bool isStreamingImages;
 
+  final bool _isRecordingPaused;
+
+  /// True when camera [isRecordingVideo] and recording is paused.
+  bool get isRecordingPaused => isRecordingVideo && _isRecordingPaused;
+
   final String errorDescription;
 
   /// The size of the preview in pixels.
@@ -172,6 +180,7 @@ class CameraValue {
     bool isStreamingImages,
     String errorDescription,
     Size previewSize,
+    bool isRecordingPaused,
   }) {
     return CameraValue(
       isInitialized: isInitialized ?? this.isInitialized,
@@ -180,6 +189,7 @@ class CameraValue {
       isRecordingVideo: isRecordingVideo ?? this.isRecordingVideo,
       isTakingPicture: isTakingPicture ?? this.isTakingPicture,
       isStreamingImages: isStreamingImages ?? this.isStreamingImages,
+      isRecordingPaused: isRecordingPaused ?? _isRecordingPaused,
     );
   }
 
@@ -446,7 +456,7 @@ class CameraController extends ValueNotifier<CameraValue> {
         'startVideoRecording',
         <String, dynamic>{'textureId': _textureId, 'filePath': filePath},
       );
-      value = value.copyWith(isRecordingVideo: true);
+      value = value.copyWith(isRecordingVideo: true, isRecordingPaused: false);
     } on PlatformException catch (e) {
       throw CameraException(e.code, e.message);
     }
@@ -492,11 +502,8 @@ class CameraController extends ValueNotifier<CameraValue> {
       );
     }
     try {
-      // value = value.copyWith(isRecordingVideo: false);
-      // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-      // https://github.com/flutter/flutter/issues/26431
-      // ignore: strong_mode_implicit_dynamic_method
-      await _channel.invokeMethod(
+      value = value.copyWith(isRecordingPaused: true);
+      await _channel.invokeMethod<void>(
         'pauseVideoRecording',
         <String, dynamic>{'textureId': _textureId},
       );
@@ -520,11 +527,8 @@ class CameraController extends ValueNotifier<CameraValue> {
       );
     }
     try {
-      // value = value.copyWith(isRecordingVideo: false);
-      // TODO(amirh): remove this on when the invokeMethod update makes it to stable Flutter.
-      // https://github.com/flutter/flutter/issues/26431
-      // ignore: strong_mode_implicit_dynamic_method
-      await _channel.invokeMethod(
+      value = value.copyWith(isRecordingPaused: false);
+      await _channel.invokeMethod<void>(
         'resumeVideoRecording',
         <String, dynamic>{'textureId': _textureId},
       );