@Override
public void onUIPositionChange(
PtrFrameLayout frame, boolean isUnderTouch, byte status, PtrIndicator ptrIndicator) {
float percent = Math.min(1f, ptrIndicator.getCurrentPercent());
if (status == PtrFrameLayout.PTR_STATUS_PREPARE) {
mDrawable.setAlpha((int) (255 * percent));
mDrawable.showArrow(true);
float strokeStart = ((percent) * .8f);
mDrawable.setStartEndTrim(0f, Math.min(0.8f, strokeStart));
mDrawable.setArrowScale(Math.min(1f, percent));
// magic
float rotation = (-0.25f + .4f * percent + percent * 2) * .5f;
mDrawable.setProgressRotation(rotation);
invalidate();
}
}