styles.xml

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

<!--
  ~ Copyright (c) 2015 Zhang Hai <Dreaming.in.Code.ZH@Gmail.com>
  ~ All Rights Reserved.
  -->

<resources>

    <style name="Widget.MaterialProgressBar.ProgressBar.Horizontal" parent="android:Widget.ProgressBar.Horizontal">
        <!--
        Disabled for correct behavior on Android 4.x, see
        https://github.com/android/platform_frameworks_base/commit/911743652b597057a1bd7ef8a921e9ff8dce0f4a#diff-149f45c5ff2d3185bb79688ba17bc432L536
        <item name="android:progressDrawable">@null</item>
        -->
        <item name="android:indeterminateDrawable">@null</item>
        <item name="android:minHeight">16dp</item>
        <item name="android:maxHeight">16dp</item>
    </style>

    <style name="Widget.MaterialProgressBar.ProgressBar.Horizontal.NoPadding">
        <item name="android:minHeight">4dp</item>
        <item name="android:maxHeight">4dp</item>
    </style>

    <style name="Widget.MaterialProgressBar.ProgressBar" parent="android:Widget.ProgressBar">
        <item name="android:indeterminateDrawable">@null</item>
        <!-- We have support for determinate circular progress drawable. -->
        <item name="android:indeterminateOnly">false</item>
        <item name="android:minWidth">48dp</item>
        <item name="android:maxWidth">48dp</item>
        <item name="android:minHeight">48dp</item>
        <item name="android:maxHeight">48dp</item>
    </style>

    <style name="Widget.MaterialProgressBar.ProgressBar.NoPadding">
        <item name="android:minWidth">42dp</item>
        <item name="android:maxWidth">42dp</item>
        <item name="android:minHeight">42dp</item>
        <item name="android:maxHeight">42dp</item>
    </style>

    <style name="Widget.MaterialProgressBar.ProgressBar.Large">
        <item name="android:minWidth">76dp</item>
        <item name="android:maxWidth">76dp</item>
        <item name="android:minHeight">76dp</item>
        <item name="android:maxHeight">76dp</item>
    </style>

    <style name="Widget.MaterialProgressBar.ProgressBar.Large.NoPadding">
        <item name="android:minWidth">66.5dp</item>
        <item name="android:maxWidth">66.5dp</item>
        <item name="android:minHeight">66.5dp</item>
        <item name="android:maxHeight">66.5dp</item>
    </style>

    <style name="Widget.MaterialProgressBar.ProgressBar.Small">
        <item name="android:minWidth">16dp</item>
        <item name="android:maxWidth">16dp</item>
        <item name="android:minHeight">16dp</item>
        <item name="android:maxHeight">16dp</item>
    </style>

    <style name="Widget.MaterialProgressBar.ProgressBar.Small.NoPadding">
        <item name="android:minWidth">14dp</item>
        <item name="android:maxWidth">14dp</item>
        <item name="android:minHeight">14dp</item>
        <item name="android:maxHeight">14dp</item>
    </style>
</resources>