Why do we pass an adapter to the Section Indexer object?

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Why do we pass an adapter to the Section Indexer object in android?

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It actually says in android documentation but basically it stands for fast scrolling.I recommend you to read https://developer.android.com/reference/android/widget/SectionIndexer.html and if you want to implement http://www.survivingwithandroid.com/2012/12/android-listview-sectionindexer-fastscroll.html this link.However android developer site explains more detailed.