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解决办法:
添加两个属性:
android:shadowColor = "#00ff00"
android:shadowRadius="0.2"
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!Hello World!Hello World!Hello World!Hello World!"
android:ellipsize="marquee"
android:shadowColor = "#00ff00"
android:shadowRadius="0.2"
android:layout_marginLeft="10dp"
android:paddingLeft="10dp"
android:marqueeRepeatLimit="marquee_forever"
android:background="#0000ff"
android:singleLine="true"
android:focusable="true"/>
参考:https://blog.csdn.net/ysh06201418/article/details/26376699
android:ellipsize = "end" 省略号在结尾
android:ellipsize = "start" 省略号在开头
android:ellipsize = "middle" 省略号在中间
android:ellipsize = "marquee" 跑马灯
android:shadowColor :阴影颜色
android:shadowDx :阴影x方向位移
android:shadowDy :阴影y方向位移
android:shadowRadius :阴影的半径
注意:实现跑马灯,必须让该控件获得焦点。