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.JuHonggang:ShadowDrawable:0.1'
}
通过一行代码即可实现阴影效果
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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