Fix ShutterCallback

plugin/src/main/java/com/theta360/pluginsample/CameraFragment.java

@@ -54,6 +54,7 @@ public class CameraFragment extends Fragment {
     private MediaRecorder mMediaRecorder;//for video
     private boolean isSurface = false;
     private boolean isCapturing = false;
+    private boolean isShutter = false;
     private File instanceRecordMP4;
     private File instanceRecordWAV;
     private MediaRecorder.OnInfoListener onInfoListener = new MediaRecorder.OnInfoListener() {
@@ -93,7 +94,11 @@ public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
     private Camera.ShutterCallback onShutterCallback = new Camera.ShutterCallback() {
         @Override
         public void onShutter() {
-            mCallback.onShutter();
+            // ShutterCallback is called twice.
+            if (!isShutter) {
+                mCallback.onShutter();
+                isShutter = true;
+            }
         }
     };
     private Camera.PictureCallback onJpegPictureCallback = new Camera.PictureCallback() {
@@ -110,6 +115,8 @@ public void onPictureTaken(byte[] data, Camera camera) {
                 e.printStackTrace();
             }
 
+            mCallback.onPictureTaken();
+
             mCamera.startPreview();
             isCapturing = false;
         }
@@ -208,6 +215,7 @@ public void stopWatching() {
     public void takePicture() {
         if (!isCapturing) {
             isCapturing = true;
+            isShutter = false;
 
             mParameters.setPictureSize(5376, 2688);
             mParameters.set("RIC_SHOOTING_MODE", "RicStillCaptureStd");