@Override
 public int getSectionForPosition(int position) {
   final int contactTileAdapterCount = mContactTileAdapter.getCount();
   if (position <= contactTileAdapterCount) {
     return 0;
   } else {
     // "-1" for mAccountFilterHeaderContainer
     final int localPosition = position - contactTileAdapterCount - 1;
     return mContactEntryListAdapter.getSectionForPosition(localPosition);
   }
 }
 @Override
 public int getItemViewType(int position) {
   final int contactTileAdapterCount = mContactTileAdapter.getCount();
   final int contactEntryListAdapterCount = mContactEntryListAdapter.getCount();
   // There should be four kinds of types that are usually used, and one more exceptional
   // type (IGNORE_ITEM_VIEW_TYPE), which sometimes comes from mContactTileAdapter.
   //
   // The four ordinary view types have the index equal to or more than 0, and less than
   // mContactTileAdapter.getViewTypeCount()+ mContactEntryListAdapter.getViewTypeCount() + 2.
   // (See also this class's getViewTypeCount())
   //
   // We have those values for:
   // - The view types mContactTileAdapter originally has
   // - The view types mContactEntryListAdapter originally has
   // - mAccountFilterHeaderContainer ("all" section's account header), and
   // - mLoadingView
   //
   // Those types should not be mixed, so we have a different range for each kinds of types:
   // - Types for mContactTileAdapter ("tile" and "frequent" sections)
   //   They should have the index, >=0 and <mContactTileAdapter.getViewTypeCount()
   //
   // - Types for mContactEntryListAdapter ("all" sections)
   //   They should have the index, >=mContactTileAdapter.getViewTypeCount() and
   //   <(mContactTileAdapter.getViewTypeCount() + mContactEntryListAdapter.getViewTypeCount())
   //
   // - Type for "all" section's account header
   //   It should have the exact index
   //   mContactTileAdapter.getViewTypeCount()+ mContactEntryListAdapter.getViewTypeCount()
   //
   // - Type for "loading" view used during "all" section is being loaded.
   //   It should have the exact index
   //   mContactTileAdapter.getViewTypeCount()+ mContactEntryListAdapter.getViewTypeCount() + 1
   //
   // As an exception, IGNORE_ITEM_VIEW_TYPE (-1) will be remained as is, which will be used
   // by framework's Adapter implementation and thus should be left as is.
   if (position < contactTileAdapterCount) { // For "tile" and "frequent" sections
     return mContactTileAdapter.getItemViewType(position);
   } else if (position == contactTileAdapterCount) { // For "all" section's account header
     return mContactTileAdapter.getViewTypeCount() + mContactEntryListAdapter.getViewTypeCount();
   } else { // For "all" section
     if (mContactEntryListAdapter.isLoading()) { // "All" section is being loaded.
       return mContactTileAdapter.getViewTypeCount()
           + mContactEntryListAdapter.getViewTypeCount()
           + 1;
     } else {
       // "-1" for mAccountFilterHeaderContainer
       final int localPosition = position - contactTileAdapterCount - 1;
       final int type = mContactEntryListAdapter.getItemViewType(localPosition);
       // IGNORE_ITEM_VIEW_TYPE must be handled differently.
       return (type < 0) ? type : type + mContactTileAdapter.getViewTypeCount();
     }
   }
 }
 @Override
 public int getCount() {
   final int contactTileAdapterCount = mContactTileAdapter.getCount();
   final int contactEntryListAdapterCount = mContactEntryListAdapter.getCount();
   if (mContactEntryListAdapter.isLoading()) {
     // Hide "all" contacts during its being loaded. Instead show "loading" view.
     //
     // "+2" for mAccountFilterHeaderContainer and mLoadingView
     return contactTileAdapterCount + 2;
   } else {
     // "+1" for mAccountFilterHeaderContainer
     return contactTileAdapterCount + contactEntryListAdapterCount + 1;
   }
 }
 @Override
 public Object getItem(int position) {
   final int contactTileAdapterCount = mContactTileAdapter.getCount();
   final int contactEntryListAdapterCount = mContactEntryListAdapter.getCount();
   if (position < contactTileAdapterCount) { // For "tile" and "frequent" sections
     return mContactTileAdapter.getItem(position);
   } else if (position == contactTileAdapterCount) { // For "all" section's account header
     return mAccountFilterHeaderContainer;
   } else { // For "all" section
     if (mContactEntryListAdapter.isLoading()) { // "All" section is being loaded.
       return mLoadingView;
     } else {
       // "-1" for mAccountFilterHeaderContainer
       final int localPosition = position - contactTileAdapterCount - 1;
       return mContactTileAdapter.getItem(localPosition);
     }
   }
 }
 @Override
 public boolean isEnabled(int position) {
   final int contactTileAdapterCount = mContactTileAdapter.getCount();
   final int contactEntryListAdapterCount = mContactEntryListAdapter.getCount();
   if (position < contactTileAdapterCount) { // For "tile" and "frequent" sections
     return mContactTileAdapter.isEnabled(position);
   } else if (position == contactTileAdapterCount) { // For "all" section's account header
     // This will be handled by View's onClick event instead of ListView's onItemClick event.
     return false;
   } else { // For "all" section
     if (mContactEntryListAdapter.isLoading()) { // "All" section is being loaded.
       return false;
     } else {
       // "-1" for mAccountFilterHeaderContainer
       final int localPosition = position - contactTileAdapterCount - 1;
       return mContactEntryListAdapter.isEnabled(localPosition);
     }
   }
 }
 @Override
 public boolean isEmpty() {
   // Cannot use the super's method here because we add extra rows in getCount() to account
   // for headers
   return mContactTileAdapter.getCount() + mContactEntryListAdapter.getCount() == 0;
 }
 public boolean shouldShowFirstScroller(int firstVisibleItem) {
   final int contactTileAdapterCount = mContactTileAdapter.getCount();
   return firstVisibleItem > contactTileAdapterCount;
 }
 @Override
 public int getPositionForSection(int sectionIndex) {
   final int contactTileAdapterCount = mContactTileAdapter.getCount();
   final int localPosition = mContactEntryListAdapter.getPositionForSection(sectionIndex);
   return contactTileAdapterCount + 1 + localPosition;
 }
  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    final int contactTileAdapterCount = mContactTileAdapter.getCount();
    final int contactEntryListAdapterCount = mContactEntryListAdapter.getCount();

    // Obtain a View relevant for that position, and adjust its horizontal padding. Each
    // View has different implementation, so we use different way to control those padding.
    if (position < contactTileAdapterCount) { // For "tile" and "frequent" sections
      final View view = mContactTileAdapter.getView(position, convertView, parent);
      final int frequentHeaderPosition = mContactTileAdapter.getFrequentHeaderPosition();
      if (position < frequentHeaderPosition) { // "starred" contacts
        // No padding adjustment.
      } else if (position == frequentHeaderPosition) {
        view.setPadding(
            mItemPaddingLeft,
            mFrequentHeaderPaddingTop,
            mItemPaddingRight,
            view.getPaddingBottom());
      } else {
        // Views for "frequent" contacts use FrameLayout's margins instead of padding.
        final FrameLayout frameLayout = (FrameLayout) view;
        final View child = frameLayout.getChildAt(0);
        FrameLayout.LayoutParams params =
            new FrameLayout.LayoutParams(
                FrameLayout.LayoutParams.WRAP_CONTENT, FrameLayout.LayoutParams.WRAP_CONTENT);
        params.setMargins(mItemPaddingLeft, 0, mItemPaddingRight, 0);
        child.setLayoutParams(params);
      }
      return view;
    } else if (position == contactTileAdapterCount) { // For "all" section's account header
      mAccountFilterHeaderContainer.setPadding(
          mItemPaddingLeft,
          mAccountFilterHeaderContainer.getPaddingTop(),
          mItemPaddingRight,
          mAccountFilterHeaderContainer.getPaddingBottom());

      // Show a single "No Contacts" label under the "all" section account header
      // if no contacts are displayed.
      mAccountFilterHeaderContainer
          .findViewById(R.id.contact_list_all_empty)
          .setVisibility(contactEntryListAdapterCount == 0 ? View.VISIBLE : View.GONE);
      return mAccountFilterHeaderContainer;
    } else { // For "all" section
      if (mContactEntryListAdapter.isLoading()) { // "All" section is being loaded.
        mLoadingView.setPadding(
            mItemPaddingLeft,
            mLoadingView.getPaddingTop(),
            mItemPaddingRight,
            mLoadingView.getPaddingBottom());
        return mLoadingView;
      } else {
        // "-1" for mAccountFilterHeaderContainer
        final int localPosition = position - contactTileAdapterCount - 1;
        final ContactListItemView itemView =
            (ContactListItemView)
                mContactEntryListAdapter.getView(localPosition, convertView, null);
        itemView.setPadding(
            mItemPaddingLeft,
            itemView.getPaddingTop(),
            mItemPaddingRight,
            itemView.getPaddingBottom());
        itemView.setSelectionBoundsHorizontalMargin(mItemPaddingLeft, mItemPaddingRight);
        return itemView;
      }
    }
  }