res/drawable/ic_lockscreen_answer_video.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2014 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
  -->
<!-- Used with incoming call wigdet. -->
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:state_enabled="true" android:state_active="false" android:state_focused="false"
        android:drawable="@drawable/ic_lockscreen_answer_video_normal_layer"/>
    <item
        android:state_enabled="true" android:state_active="true"  android:state_focused="false"
        android:drawable="@drawable/ic_lockscreen_answer_video_activated_layer" />
   <item
        android:state_enabled="true" android:state_active="false"  android:state_focused="true"
        android:drawable="@drawable/ic_lockscreen_answer_video_activated_layer" />
</selector>