res/drawable/blocked_contact.xml

<?xml version="1.0" encoding="utf-8"?>

<!--
  ~ Copyright (C) 2015 The Android Open Source Project
  ~
  ~ Licensed under the Apache License, Version 2.0 (the "License");
  ~ you may not use this file except in compliance with the License.
  ~ You may obtain a copy of the License at
  ~
  ~      http://www.apache.org/licenses/LICENSE-2.0
  ~
  ~ Unless required by applicable law or agreed to in writing, software
  ~ distributed under the License is distributed on an "AS IS" BASIS,
  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  ~ See the License for the specific language governing permissions and
  ~ limitations under the License
  -->

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <item>
        <shape android:shape="oval">
            <solid android:color="@color/blocked_contact_background" />
            <size android:width="24dp" android:height="24dp" />
        </shape>
    </item>

    <item android:drawable="@drawable/ic_block_24dp"
        android:width="18dp"
        android:height="18dp"
        android:gravity="center" />

</layer-list>