private void dataSetChanged() {
final int currentPage = mCurrentPage;
// if the adapter has stable ids, try to keep the page currently on
// stable.
if (mAdapter.hasStableIds() && mCurrentPage != INVALID_PAGE_POSITION) {
mCurrentPage = getNewPositionOfCurrentPage();
} else if (mCurrentPage == INVALID_PAGE_POSITION) {
mCurrentPage = 0;
}
// remove all the current views
removeAllViews();
mActivePageQueue.clear();
mPageCount = mAdapter.getCount();
// put the current page within the new adapter range
mCurrentPage =
Math.min(mPageCount - 1, mCurrentPage == INVALID_PAGE_POSITION ? 0 : mCurrentPage);
if (mCurrentPage != INVALID_PAGE_POSITION) {
mRecycler.setViewTypeCount(mAdapter.getViewTypeCount());
mCurrentPageId = mAdapter.getItemId(mCurrentPage);
addView(viewForPage(mCurrentPage));
if (mCurrentPage != currentPage) {
flipTo(mCurrentPage);
}
} else {
mPageCount = 0;
mFlipDistance = 0;
}
updateEmptyStatus();
}
public void flipBy(int delta) {
flipTo(mCurrentPage + delta);
}