Updating overview buttons click feedback

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

<!--

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 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

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 distributed under the License is distributed on an "AS IS" BASIS,

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 See the License for the specific language governing permissions and

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-->

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_pressed="true">

        <objectAnimator

            android:duration="@android:integer/config_shortAnimTime"

            android:propertyName="alpha"

            android:valueTo="0.5"

            android:valueType="floatType" />

    </item>

    <item android:state_focused="true">

        <objectAnimator

            android:duration="@android:integer/config_shortAnimTime"

            android:propertyName="alpha"

            android:valueTo="0.5"

            android:valueType="floatType" />

    </item>

    <item>

        <objectAnimator

            android:duration="@android:integer/config_shortAnimTime"

            android:propertyName="alpha"

            android:valueTo="1"

            android:valueType="floatType" />

    </item>

</selector>

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