ScrollView文字竖直滚动

这几天研究了下文字的竖直滚动，是用ScrollView实现的，按下“启动”按钮，开始滚动，按下停止“按钮”，停止滚动
首先是Activity,

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ScrollView;
import android.widget.TextView;

public class ScrollActivity extends Activity {
	/** Called when the activity is first created. */
	ScrollView myscroll;
	TextView tv;
	int ori = 0;
	Button stopButton, startButton, kanButton;
	boolean isFlag = true;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.mylayout);
		myscroll = (ScrollView) findViewById(R.id.sv);
		myscroll.setVerticalScrollBarEnabled(false); //禁用垂直滚动
		myscroll.setHorizontalScrollBarEnabled(false); //禁用水平滚动


		
        
        stopButton = (Button)findViewById(R.id.stopButton);
        stopButton.setOnClickListener(new OnClickListener(){

			public void onClick(View v) {
				isFlag = false;
			}});
        
        
        
        startButton = (Button)findViewById(R.id.startButton);
        startButton.setOnClickListener(new OnClickListener(){

			public void onClick(View v) {
				isFlag = true;
				startScroll();
				
			}});
        
        kanButton = (Button)findViewById(R.id.kanButton);
        kanButton.setOnClickListener(new OnClickListener(){

			public void onClick(View v) {
				int count = Thread.activeCount();
				Thread[] ts = new Thread[count];
				Thread.enumerate(ts);
				for(Thread t : ts)
				{
					System.out.println(t.getName() + " ========= ");
				}
				
			}});
	}

	Handler h = new Handler() {

		@Override
		public void handleMessage(Message msg) {
			doScrow();
		}
	};

	//滚动
	public void doScrow(){  
        int now = myscroll.getScrollY();
        if(ori == now){  
        	myscroll.scrollTo(now, 0);  
            ori = -1;  
              
        }  
        else {  
        	myscroll.smoothScrollBy(10, 2);  
              
            ori = now;  
              
        }  
    }

	//启动滚动线程
	private void startScroll()
	{
		Runnable r = new TimerLoop();
		final Thread loop = new Thread(r, "MyThread");
        loop.start();
	}
	
	public class TimerLoop implements Runnable {  
        public void run() {  
              
            while(isFlag){  
            	try {
					Thread.currentThread().sleep(100);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
                h.sendEmptyMessage(0);  
            }  
        }  
          
    }  

}

下面是xml配置

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/layout"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical" >

    <ScrollView
        android:id="@+id/sv"
        android:layout_width="500px"
        android:layout_height="50dip" >

        

            <TextView
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:text="钗头凤 陆游红酥手 黄藤酒 满城春色宫墙柳东风恶 欢情薄 一杯愁绪，几年离索错！错！错！
                                                          春如旧 人空瘦 泪痕红悒鲛绡透桃花落 闲池阁 山盟虽在 锦书难托莫! 莫! 莫!钗头凤 唐婉世情薄 人情
                                                          恶 雨送黄昏花易落晓风干 泪痕残 欲笺心事 独语斜阑难！难！难!人成各 今非昨 病魂常似秋千索
                                                          角声寒 夜阑珊 怕人寻问 咽泪装欢瞒! 瞒! 瞒!" />


    </ScrollView>

        <Button 
            android:id="@+id/stopButton" 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="结束"
            />
        
        <Button 
            android:id="@+id/startButton" 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="启动"
            />
        
        <Button 
            android:id="@+id/kanButton" 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="查看活动线程"
            />
</LinearLayout>