效果图：

51e7288e0f71e945f81f1e1b1d89f33a.gif

布局

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <TextView
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        android:id="@+id/tvTip"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#FFFDE9EB"
        android:singleLine="true"
        android:scrollHorizontally="true"
        android:ellipsize="marquee"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:marqueeRepeatLimit="marquee_forever"
        android:paddingLeft="10dp"
        android:paddingTop="12dp"
        android:paddingRight="10dp"
        android:paddingBottom="12dp"
        android:text="物流公告：受疫情影响，2020-08-20起，深圳地区暂时不支持发货"
        android:textColor="#FFEB2C3E"
        android:textSize="15sp">

        <requestFocus/>

    </TextView>

</androidx.constraintlayout.widget.ConstraintLayout>

设置以下属性：
android:singleLine="true"
android:scrollHorizontally="true"
android:ellipsize="marquee"
android:focusable="true"
android:focusableInTouchMode="true"
android:marqueeRepeatLimit="marquee_forever
这句很重要

如果界面即存在textview跑马灯效果还存在刷新refresh或edittext要把跑马灯布局给抽取出去

<include
        android:layout_below="@+id/lineView"
        android:id="@+id/pmdLay"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        layout="@layout/include_pmd_view"/>

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <TextView
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        android:id="@+id/tvTip"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/lineView"
        android:background="@color/red_ffd"
        android:singleLine="true"
        android:scrollHorizontally="true"
        android:ellipsize="marquee"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:marqueeRepeatLimit="marquee_forever"
        android:paddingLeft="@dimen/dp_10"
        android:paddingTop="@dimen/dp_12"
        android:paddingRight="@dimen/dp_10"
        android:paddingBottom="@dimen/dp_12"
        android:text="物流公告：受疫情影响，2020-08-20起，深圳地区暂时不支持发货"
        android:textColor="@color/red_ffe"
        android:textSize="@dimen/sp_15">

        <requestFocus/>

    </TextView>

</androidx.constraintlayout.widget.ConstraintLayout>

有时切换后textview跑马灯效果失效需要添加以下代码

//设置跑马灯效果，避免跑马灯效果失效
private fun setMarqueeText() {
   tvMarqueeTip.ellipsize = TextUtils.TruncateAt.MARQUEE
   tvMarqueeTip.isSingleLine = true
   tvMarqueeTip.isSelected = true
   tvMarqueeTip.isFocusable = true
   tvMarqueeTip.isFocusableInTouchMode = true
}