Android 的跑马灯工具类

package com.jxs.app.gridview.utils;

import android.os.Handler;
import android.os.Message;
import android.widget.TextView;
/**
 * 
 * @Author Jiangxs
 * @Date 2011-7-21 上午12:06:24
 * @Des 本类为跑马灯工具类 只要提供给一个要显示的字符串，一个TextView，就可以在这个TextView中实现跑马灯。
 */
public class Marquee {

	private final int TEXT_OUT = 4;
	private final int TEXT_IN = 5;

	private String titleStr;// 跑马灯字符串
	private int place = 1;// replace count
	private TextView titleTextView;

	public Marquee(String titleStr, TextView titleTextView) {
		this.titleStr = titleStr;
		this.titleTextView = titleTextView;
	}

	private Handler myHandler = new Handler() {
		@Override
		public void handleMessage(Message msg) {// 重写的方法用于接收Handler消息
			super.handleMessage(msg);
			if (msg.what == TEXT_OUT) {// 跑马灯向外出来时
				titleTextView.setText(titleStr.substring(0, place));
			} else if (msg.what == TEXT_IN) {// 跑马灯向里进去时
				titleTextView.setText(titleStr.substring(place, titleStr
						.length()));
			}
		}
	};
	public void menuThread() {
		new Thread() {// 该线程用于标题栏跑马灯的实现
			public void run() {
				boolean control = true;
				while (true) {
					if (control) {// 出来时
						myHandler.sendEmptyMessage(TEXT_OUT);
						try {
							Thread.sleep(300);// 睡觉300毫秒
						} catch (Exception e) {// 捕获异常
							e.printStackTrace();// 打印异常
						}
						if (place >= titleStr.length()) {
							place = 1;
							control = false;
						} else {
							place++;
						}
					} else {// 进去
						myHandler.sendEmptyMessage(TEXT_IN);// 发送Handler消息
						try {
							Thread.sleep(200);// 睡觉300毫秒
						} catch (Exception e) {// 捕获异常
							e.printStackTrace();// 打印异常
						}
						if (place >= titleStr.length()) {
							place = 1;
							control = true;
						} else {
							place++;// 将place加一
						}
					}
				}
			}
		}.start();
	}
}