创建style和修改style

<style name="test_style">
    <item name="android:background">#000</item>
    <item name="android:progress">@mipmap/demo</item>
</style>

<!--修改自己的style-->
<style name="test_style1" parent="test_style">
   <item name="android:background">#fff</item>
</style>
<!--修改android自带的Theme-->
<style name="test_style3" parent="Theme.AppCompat.Dialog">
   <item name="android:background">#ccc</item>
</style>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.chen.android.test.MainActivity">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        style="@style/test_style"/>
</LinearLayout>