@Override
  public void onCreate(Bundle state) {
    super.onCreate(state);
    setContentView(R.layout.activity_simple_scanner);
    setupToolbar();

    ViewGroup contentFrame = (ViewGroup) findViewById(R.id.content_frame);
    mScannerView =
        new ZXingScannerView(this) {
          @Override
          protected IViewFinder createViewFinderView(Context context) {
            return new CustomViewFinderView(context);
          }
        };
    contentFrame.addView(mScannerView);
  }
 @Override
 public void onPause() {
   super.onPause();
   mScannerView.stopCamera();
 }
 @Override
 public void onResume() {
   super.onResume();
   mScannerView.setResultHandler(this);
   mScannerView.startCamera();
 }