private void sendDownEvent() {
        if (DEBUG) {
            PtrCLog.d(LOG_TAG, "send down event");
        }
        final MotionEvent last = mLastMoveEvent;
        MotionEvent e = MotionEvent.obtain(last.getDownTime(), last.getEventTime(), MotionEvent.ACTION_DOWN, last.getX(), last.getY(), last.getMetaState());
        dispatchTouchEventSupper(e);
    }
The duration to close time

@param duration
common/src/main/java/com/sxjs/common/widget/pulltorefresh/PtrFrameLayout.java