private void init() {
if (SparkleMotionCompat.hasPresenter(mViewPager)) {
mPresenter = SparkleMotionCompat.getAnimationPresenter(mViewPager);
} else {
mPresenter = new SparkleAnimationPresenter();
}
mAnimations = new ArrayList<Animation>();
}
/**
* Setup a ViewPager within this layout, so that we can use it to run animations.
*
* @param viewPager ViewPager object being added to this layout.
* @param index Index of the ViewPager being added to this layout.
*/
private void setViewPager(@NonNull ViewPager viewPager, int index) {
if (mViewPager != null) {
throw new IllegalStateException("SparkleViewPagerLayout already has a ViewPager set.");
}
if (!SparkleMotionCompat.hasPresenter(viewPager)) {
SparkleMotionCompat.installAnimationPresenter(viewPager);
}
mViewPagerIndex = index < 0 ? getChildCount() : index;
mViewPager = viewPager;
mViewPager.addOnPageChangeListener(this);
}
