Notifies the attached observers that the underlying data has been changed and any View reflecting the data set should refresh itself.

短时间显示Toast @param context @param message

add HeaderView Adapter

Invokes {@link DataObserver#onChanged} on each observer. Called when the contents of the data set have changed. The recipient will obtain the new con

set RealAdapter {@link #setLayoutManager(RecyclerView.LayoutManager)}

Chinese character -> Pinyin

This method is called when the entire data set has changed, refresh UI

set sort-mode

{@link #setAdapter(IndexableAdapter)} @param layoutManager One of LinearLayoutManager and GridLayoutManager

set Content-ItemView click listener

set Index-ItemView click listener

add FooterView Adapter

根据newText 进行查找, 显示

Are start with a letter @return if return false, index should be #