XML布局：

<TextView
        android:layout_width="100dip"
        android:layout_height="wrap_content"
        android:ellipsize="marquee"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:marqueeRepeatLimit="marquee_forever"
        android:singleLine="true"
        android:text="走马灯xml布局实现，哈哈。。。。" />

自定义控件：

package com.android.widget;

import android.content.Context;
import android.graphics.Rect;
import android.text.TextUtils.TruncateAt;
import android.util.AttributeSet;
import android.widget.TextView;

/**
 * 
 * 一直走马灯效果控件
 * 
 * @author zuolongsnail
 */
public class CustomMarqueeTextView extends TextView {

	public MyMarqueeTextView(Context context) {
		super(context);
		createView();
	}

	public MyMarqueeTextView(Context context, AttributeSet attrs) {
		super(context, attrs);
		createView();
	}

	public MyMarqueeTextView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		createView();
	}

	private void createView() {
		setEllipsize(TruncateAt.MARQUEE);
		setMarqueeRepeatLimit(-1);
		setFocusableInTouchMode(true);
	}

	@Override
	protected void onFocusChanged(boolean focused, int direction,
			Rect previouslyFocusedRect) {
		if (focused) {
			super.onFocusChanged(focused, direction, previouslyFocusedRect);
		}
	}

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

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

}

在xml中的使用方法：

<com.android.widget.CustomMarqueeTextView
            android:id="@+id/custom_marquee_textview"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />