设置如下TextView控件文件的XML：

<com.example.Mytext
        android:id="@+id/textview" 

        android:layout_width="match_parent"

        android:layout_height="20dp"

        android:gravity="center"

        android:singleLine="true"//限制行数为1行

        android:ellipsize="marquee"//marquee 文字滚动

        android:marqueeRepeatLimit="marquee_forever"//文字滚动次数：marquee_forever 无限次

        android:focusable="true"//获取焦点

        android:focusableInTouchMode="true"//获取触摸焦点

        android:textColor="@color/red"

        android:text="@string/text"
         />

有其它布局如ScrollView等抢占焦点，需要自定义控件获取焦点：

public class Mytext extends TextView {  
public Mytext(Context context, AttributeSet attrs) {  
super(context, attrs);  
    } 
@Override
protected void onFocusChanged(boolean focused, int direction,
Rect previouslyFocusedRect) {
if(focused){  
super.onFocusChanged(focused, direction, previouslyFocusedRect);

     }
}
@Override  
public void onWindowFocusChanged(boolean hasWindowFocus) {  
if(hasWindowFocus){  
super.onWindowFocusChanged(hasWindowFocus); 

     } 
}  
@Override  
public boolean isFocused() {  
return true;  
     }  
}