最简单的跑马灯效果

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout xmlns:android=“http://schemas.android.com/apk/res/android”
android:layout_width=“match_parent”
android:layout_height=“match_parent”>

<TextView
    android:singleLine="true"
    android:ellipsize="marquee"
    android:text="大王让我来巡山，寻了南山寻北山,大王让我来巡山，寻了南山寻北山,大王让我来巡山，寻了南山寻北山,大王让我来巡山，寻了南山寻北山"
    android:background="@color/colorAccent"
    android:textSize="30sp"
    android:textColor="#ffffff"
    android:padding="10dp"
    android:focusableInTouchMode="true"
    android:marqueeRepeatLimit="marquee_forever"
    android:focusable="true"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

</android.support.constraint.ConstraintLayout>