图片拉伸 bmp style 背景图片

<?xml version="1.0" encoding="utf-8"?>
<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
    android:gravity="center"
    android:src="@drawable/img"
    android:tileMode="disabled" />

<RadioButton
android:background="@drawable/bmp" />