[camera] Improving handling when camera permissions are not granted. (flutter#2848)

Author: panmari

packages/camera/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.5.8+4
+
+* Fixed bug caused by casting a `CameraAccessException` on Android.
+
 ## 0.5.8+3
 
 * Fix bug in usage example in README.md 

packages/camera/android/src/main/java/io/flutter/plugins/camera/MethodCallHandlerImpl.java

@@ -167,8 +167,10 @@ private void instantiateCamera(MethodCall call, Result result) throws CameraAcce
   private void handleException(Exception exception, Result result) {
     if (exception instanceof CameraAccessException) {
       result.error("CameraAccess", exception.getMessage(), null);
+      return;
     }
 
+    // CameraAccessException can not be cast to a RuntimeException.
     throw (RuntimeException) exception;
   }
 }

packages/camera/pubspec.yaml

@@ -2,7 +2,7 @@ name: camera
 description: A Flutter plugin for getting information about and controlling the
   camera on Android and iOS. Supports previewing the camera feed, capturing images, capturing video,
   and streaming image buffers to dart.
-version: 0.5.8+3
+version: 0.5.8+4
 
 homepage: https://github.com/flutter/plugins/tree/master/packages/camera