RecyclerViewIndexer

RecyclerViewIndexer Library use RecyclerView.ItemDecoration to draw a indexer, but not override RecyclerView
or custom a view to implement indexer.

alphabet_indexer

Download

maven:

<dependency>
  <groupId>com.buxiliulian.rv</groupId>
  <artifactId>recyclerviewindexer</artifactId>
  <version>0.1.7</version>
  <type>pom</type>
</dependency>

gradle:

compile 'com.buxiliulian.rv:recyclerviewindexer:0.1.7'

Usage

        SimpleIndexer.Builder builder = new SimpleIndexer.Builder(this, ContactsIndexer.DEFAULT_INDEXER_CHARACTERS)
                .indexerTextSize(12)
                .padding(SimpleIndexer.DEFAULT_PADDING_DP)
                .indicatorColor(SimpleIndexer.DEFAULT_INDICATOR_BG_COLOR);
        SimpleIndexer balloonIndexer = new BalloonIndexer(builder);
        balloonIndexer.attachToRecyclerView(mContactsList, (rv, sectionIndex) -> {
            RecyclerView.Adapter adapter = rv.getAdapter();
            if (adapter instanceof SectionIndexer) {
                SectionIndexer indexer = (SectionIndexer) adapter;
                int pos = indexer.getPositionForSection(sectionIndex);
                RecyclerView.LayoutManager layoutManager = rv.getLayoutManager();
                if (layoutManager instanceof LinearLayoutManager) {
                    LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
                    linearLayoutManager.scrollToPositionWithOffset(pos, 0);
                }
            }
        });
    }

Contact & Help

If you want to know more, please refer to https://blog.csdn.net/zwlove5280/article/details/80979207.

Please feel free to contact me if you have any question when using this library.