一个快速跳跃分组的侧边栏控件，示例中配合 RecyclerView 实现。

波浪的实现采用了三段二次贝塞尔曲线，附一张手稿草图，仅供参考。

Usage

use WaveSideBarView in the layout file

    <cc.solart.wave.WaveSideBarView
        android:id="@+id/side_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

set OnTouchLetterChangeListener

    mSideBarView.setOnTouchLetterChangeListener(new WaveSideBarView.OnTouchLetterChangeListener() {
            @Override
            public void onLetterChange(String letter) {
                int pos = adapter.getLetterPosition(letter);

                if (pos != -1) {
                    mRecyclerView.scrollToPosition(pos);
                }
            }
        });

Thanks

used PinnedHeaderDecoration in RecyclerItemDecoration

License

No fucking license. just enjoy it!