Fixing RuntimeException when calling CameraView.stop() google#158

Author: luowei

library/src/main/api14/com/google/android/cameraview/Camera1.java

@@ -243,8 +243,11 @@ void takePictureInternal() {
                 public void onPictureTaken(byte[] data, Camera camera) {
                     isPictureCaptureInProgress.set(false);
                     mCallback.onPictureTaken(data);
-                    camera.cancelAutoFocus();
-                    camera.startPreview();
+                    //Check if camera still previewing
+                    if (mShowingPreview) {
+                        camera.cancelAutoFocus();
+                        camera.startPreview();
+                    }
                 }
             });
         }