在项目的build.gradle中添加：
allprojects {
repositories {
...
maven { url 'https://jitpack.io'
}
}
}
在APP模块下的build.gradle中添加依赖：
dependencies {
implementation 'com.github.Liberuman:ShadowDrawable:0.1'
}
通过一行代码即可实现阴影效果
/**
* 为指定View设置带阴影的背景
* @param view 目标View
* @param bgColor View背景色
* @param shapeRadius View的圆角
* @param shadowColor 阴影的颜色
* @param shadowRadius 阴影的宽度
* @param offsetX 阴影水平方向的偏移量
* @param offsetY 阴影垂直方向的偏移量
*/
public static void setShadowDrawable(View view, int bgColor, int shapeRadius, int shadowColor, int shadowRadius, int offsetX, int offsetY);
// 实例：设置背景为颜色为#3D5AFE，圆角为8dp, 阴影颜色为#66000000，宽度为10dp的背景
ShadowDrawable.setShadowDrawable(textView1, Color.parseColor("#3D5AFE"), dpToPx(8),
Color.parseColor("#66000000"), dpToPx(10), 0, 0);
详细介绍可参考：Android开发中阴影效果的实现
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