You can use WaveSideBar in the contacts page of your application.
Refer to AlexLiuSheng/AnimSideBar.

Screenshot

Include the WaveSideBar to Your Project

With gradle:

dependencies {
   compile 'com.gjiazhe:wavesidebar:1.3'
}

Use WaveSideBar in Layout File

<com.gjiazhe.wavesidebar.WaveSideBar
        android:id="@+id/side_bar"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingRight="8dp"
        app:sidebar_position="right"
        app:sidebar_max_offset="80dp"
        app:sidebar_lazy_respond="false"
        app:sidebar_text_color="#8D6E63"
        app:sidebar_text_size="14sp"
        app:sidebar_text_alignment="center"/>

Description of Attributes

Attributes	Format	Default	Description
sidebar_text_color	color	Color.GRAY	Text color of side bar.
sidebar_text_size	dimension	14sp	Text size of side bar.
sidebar_max_offset	dimension	80dp	Offset of the selected item.
sidebar_position	enum {right, left}	right	Be placed on left or right in the view.
sidebar_text_alignment	enum {center, left, right}	center	Alignment of items.
sidebar_lazy_respond	boolean	false	If true, the listener will not be called until the finger up. If false, the listener will be called when the finger down, move and up.

You can set these attributes in the layout file, or in the java code:

WaveSideBar sideBar = (WaveSideBar) findViewById(R.id.side_bar);
sideBar.setTextColor(Color.BLACK);
sideBar.setMaxOffset(100);
sideBar.setPosition(WaveSideBar.POSITION_LEFT);
sideBar.setTextAlign(WaveSideBar.TEXT_ALIGN_CENTER);
sideBar.setLazyRespond(true);

Set the Listener to Observe WaveSideBar

WaveSideBar sideBar = (WaveSideBar) findViewById(R.id.side_bar);
sideBar.setOnSelectIndexItemListener(new WaveSideBar.OnSelectIndexItemListener() {
    @Override
    public void onSelectIndexItem(String index) {
        Log.d("WaveSideBar", index);
        // Do something here ....
    }
});

Customize the indexes

Use setIndexItems to Customize the indexes.

sideBar.setIndexItems("あ", "か", "さ", "た", "な", "は", "ま", "や", "ら", "わ");

Use Left Hand?

Use setPosition to change the position of side bar.

sideBar.setPosition(WaveSideBar.POSITION_LEFT);

Lazy respond

use setLazyRespond to set whether the side bar should respond lazily to your touch events.

sideBar.setLazyRespond(true);