@Override
public void onChanged() {
PagerAdapter adapter = mPager.getAdapter();
int count = 0;
if (adapter instanceof InfinitePagerAdapter) {
count = ((InfinitePagerAdapter) adapter).getRealCount();
} else {
count = adapter.getCount();
}
if (count > mItemCount) {
for (int i = 0; i < count - mItemCount; i++) {
ImageView indicator = new ImageView(mContext);
indicator.setImageDrawable(mUnselectedDrawable);
indicator.setPadding(
(int) mUnSelectedPadding_Left,
(int) mUnSelectedPadding_Top,
(int) mUnSelectedPadding_Right,
(int) mUnSelectedPadding_Bottom);
addView(indicator);
mIndicators.add(indicator);
}
} else if (count < mItemCount) {
for (int i = 0; i < mItemCount - count; i++) {
removeView(mIndicators.get(0));
mIndicators.remove(0);
}
}
mItemCount = count;
mPager.setCurrentItem(mItemCount * 20 + mPager.getCurrentItem());
}
/**
* since we used a adapter wrapper, so we can't getCount directly from wrapper.
*
* @return
*/
private int getShouldDrawCount() {
if (mPager.getAdapter() instanceof InfinitePagerAdapter) {
return ((InfinitePagerAdapter) mPager.getAdapter()).getRealCount();
} else {
return mPager.getAdapter().getCount();
}
}
/**
* bind indicator with viewpagerEx.
*
* @param pager
*/
public void setViewPager(ViewPagerEx pager) {
if (pager.getAdapter() == null) {
throw new IllegalStateException("Viewpager does not have adapter instance");
}
mPager = pager;
mPager.setOnPageChangeListener(this);
((InfinitePagerAdapter) mPager.getAdapter())
.getRealAdapter()
.registerDataSetObserver(dataChangeObserver);
}
/**
* clear self means unregister the dataset observer and remove all the child views(indicators).
*/
public void destroySelf() {
if (mPager == null || mPager.getAdapter() == null) {
return;
}
InfinitePagerAdapter wrapper = (InfinitePagerAdapter) mPager.getAdapter();
PagerAdapter adapter = wrapper.getRealAdapter();
if (adapter != null) {
adapter.unregisterDataSetObserver(dataChangeObserver);
}
removeAllViews();
}