Android 背景的一些设置

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边框渐变色

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="rectangle">
            <padding
                android:bottom="1dp"
                android:left="1dp"
                android:right="1dp"
                android:top="1dp" />
            <solid android:color="#0DCCCCCC" />
            <corners android:radius="8dp" />
        </shape>
    </item>
    <item>
        <shape android:shape="rectangle">
            <padding
                android:bottom="1dp"
                android:left="1dp"
                android:right="1dp"
                android:top="1dp" />
            <solid android:color="#10CCCCCC" />
            <corners android:radius="8dp" />
        </shape>
    </item>
    <item>
        <shape android:shape="rectangle">
            <padding
                android:bottom="1dp"
                android:left="1dp"
                android:right="1dp"
                android:top="1dp" />
            <solid android:color="#15CCCCCC" />
            <corners android:radius="8dp" />
        </shape>
    </item>
    <item>
        <shape android:shape="rectangle">
            <padding
                android:bottom="1dp"
                android:left="1dp"
                android:right="1dp"
                android:top="1dp" />
            <solid android:color="#20CCCCCC" />
            <corners android:radius="8dp" />
        </shape>
    </item>
    <item>
        <shape android:shape="rectangle">
            <padding
                android:bottom="1dp"
                android:left="1dp"
                android:right="1dp"
                android:top="1dp" />
            <solid android:color="#25CCCCCC" />
            <corners android:radius="8dp" />
        </shape>
    </item>
    <item>
        <shape>
            <solid android:color="#FFFFFF" />
            <corners android:radius="4dp" />
        </shape>
    </item>
</layer-list>

背景圆环

<?xml version="1.0" encoding="utf-8"?>
<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="ring"
    android:useLevel="false"
    android:thickness="1dp">

    <solid android:color="#E00808"/>

    <size android:width="40dp"
        android:height="40dp" />

</shape>