public void setZoomingEnabled(boolean zoomingEnabled) {
    mZoomingEnabled = zoomingEnabled;
    mZoomableController.setEnabled(false);
  }
Sets whether long-press tap detection is enabled. Unfortunately, long-press conflicts with
onDoubleTapEvent.
samples/zoomable/src/main/java/com/facebook/samples/zoomable/ZoomableDraweeView.java