1.橙色
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<gradient
android:startColor="#fe6969"
android:centerColor="#fb7a6a"
android:endColor="#ff976d"
android:angle="45"
/>
</shape>
2.紫色
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<gradient android:startColor="#8f59db"
android:centerColor="#a86bf7"
android:endColor="#bc90fa"
android:angle="45"/>
</shape>
3.蓝色
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<gradient android:startColor="#249cc1"
android:centerColor="#46bfe4"
android:endColor="#5bd1f5"
android:angle="45"
/>
</shape>