Android动态设置背景边框颜色

控件依赖版本至少25

implementation 'com.android.support:design:25.+'

新建shape_radius2_border1_gray.xml文件

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

    <!-- 主体背景颜色值 -->
    <solid android:color="#FFFFFF" />
    <corners android:radius="2dp"></corners>
    <!-- 连框宽度和颜色值 -->
    <stroke
        android:width="1dp"
        android:color="#E9E9E9" />
</shape>
// 然后设置
android:background="@drawable/shape_radius2_border1_gray"

重点来了

   LinearLayout ll_root=helper.getView(R.id.ll_root);
    GradientDrawable drawable = (GradientDrawable) ll_root.getBackground();
    // 设置边框的宽度和颜色
    drawable.setStroke(1, Color.parseColor("#ff0000"));