<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="com.example.app6.MainActivity" >

    <com.example.TextView_flow.marqueeText

        android:id="@+id/textView_1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="@string/hello_world"

        android:singleLine="true"

        android:ellipsize="marquee"

        android:focusable="true"

        android:focusableInTouchMode="true"/>

    <!--  TextView可以用其子类来声明，子类的表现形式是包名+类名

            设置4条语功能语句才能实现跑马灯的效果-->

    <com.example.TextView_flow.marqueeText

        android:layout_below="@id/textView_1"

        android:layout_marginTop="10dp"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="@string/hello_world"

        android:singleLine="true"

        android:ellipsize="marquee"

        android:focusable="true"

        android:focusableInTouchMode="true"/>

</RelativeLayout>

package com.example.TextView_flow;

import android.content.Context;

import android.util.AttributeSet;

import android.widget.TextView;

public class marqueeText extends TextView{

    public marqueeText(Context context) {

        super(context);

        // TODO Auto-generated constructor stub

    }

    public marqueeText(Context context, AttributeSet attrs, int defStyle) {

        super(context, attrs, defStyle);

        // TODO Auto-generated constructor stub

    }

    public marqueeText(Context context, AttributeSet attrs) {

        super(context, attrs);

        // TODO Auto-generated constructor stub

    }

    /*

     * 复写这个方法是第一个文本框得到了可聚焦为true的方法，以跑马灯形式显示，而其他文本框得不到

     */

    @Override

    public boolean isFocused() {

        return true;

    }

}

package com.example.TextView_flow;

import android.app.Activity;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

public class MainActivity extends Activity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

    }

}