一、前言

Android自定义边框，可以设置任意边框的角度和阴影。我下面分为四个角度设置边框、两个角度设置边框、半圆球设置边框加两层阴影等。

二、边框分类：

1、四个角度设置边框

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <corners android:radius="@dimen/dp_16" />
    <solid android:color="@color/color_FFFAFAFA" />
</shape>

效果图：

图片.png

2、两个角度设置边框

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="@android:color/white" />
    <corners
        android:topLeftRadius="@dimen/dp_20"
        android:topRightRadius="@dimen/dp_20"
        />
    <padding
        android:top="@dimen/dp_10" />
</shape>

效果图：

图片.png

3、半圆球设置边框加两层阴影

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <!-- 外层边框1 -->
    <item>
        <shape>
            <padding
                android:bottom="@dimen/dp_1"
                android:left="@dimen/dp_1"
                android:right="0dp"
                android:top="@dimen/dp_1" />
            <solid android:color="#f00" />
            <corners
                android:bottomLeftRadius="@dimen/dp_28"
                android:topLeftRadius="@dimen/dp_28" />
        </shape>
    </item>

    <!-- 外层边框2 -->
    <item>
        <shape>
            <padding
                android:bottom="@dimen/dp_1"
                android:left="@dimen/dp_1"
                android:right="0dp"
                android:top="@dimen/dp_1" />
            <solid android:color="@color/color_FFF9F8F8" />
            <corners
                android:bottomLeftRadius="@dimen/dp_27"
                android:topLeftRadius="@dimen/dp_27" />
        </shape>
    </item>

    <!--  外层边框3 -->
    <item>
        <shape>
            <padding
                android:bottom="@dimen/dp_1"
                android:left="@dimen/dp_1"
                android:right="0dp"
                android:top="@dimen/dp_1" />
            <solid android:color="@color/color_FFDBDBDB" />
            <corners
                android:bottomLeftRadius="@dimen/dp_26"
                android:topLeftRadius="@dimen/dp_26" />
        </shape>
    </item>

    
    <!-- 主体背景颜色值 -->
    <item>

        <!-- 边框里面背景颜色 白色 -->
        <shape>
            <solid android:color="@color/color_FFFFFF" />
            <size
                android:width="@dimen/dp_52"
                android:height="@dimen/dp_52" />
            <corners
                android:bottomLeftRadius="@dimen/dp_26"
                android:topLeftRadius="@dimen/dp_26" />
        </shape>

    </item>

</layer-list>

效果图：