if (event.getAction() == MotionEvent.ACTION_MOVE) {
dzoom = event.getRawX() - startX;
Log.d(TAG,"move_action, dzoom: " + dzoom);
if (event.getAction() == MotionEvent.ACTION_MOVE) {
dzoom = event.getRawX() - startX;
Log.d(TAG,"move_action, dzoom: " + dzoom);