如果运行时，可以看到滚动条由条慢慢变短，则说明程序成功了。截图如下，建议选择大点的文件做测试。

main.xml

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

android:layout_height="wrap_content" android:id="@+id/scrollView1" android:layout_width="fill_parent">

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="wrap_content">

android:id="@+id/tv"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

/>

FileRead.java

public class FileRead {

boolean readend=false;

List al=null;

public  class ReadNodesThread extends Thread{//读取线程

public void run()

{

al=new ArrayList(100);

al.clear();

readend=false;

int i=0;

try {

RandomAccessFile raf=new RandomAccessFile("/sdcard/test.txt","r");

//try {

while(raf.getFilePointer()

{

al.add(raf.readLine());

//sleep(100);//如果测试文件太小，这里休眠是为了测试，

}

} catch (Exception e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}

readend=true;

}

};

}

MultiThreadActivity.java

public class MultiThreadActivity extends Activity { FileRead fr=null; Handler mHandler=null; int curi=0; Runnable updateui=null; String[] tmp=null; String s=""; TextView tv=null; class ReadListener extends Thread{//监听线程，当数据更新数目大于10条时，更新UI public void run() { int i=0,newi=0; while(!fr.readend) { newi=fr.al.size(); if((newi-i)>10)//新增数据大于10条，更新UI { i=newi; tmp=(String[])fr.al.toArray(new String[fr.al.size()]); mHandler.post(updateui); try { Thread.sleep(100); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } //数据读完了 tmp=(String[])fr.al.toArray(new String[fr.al.size()]); mHandler.post(updateui); try { Thread.sleep(100); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } }  }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); tv=(TextView)findViewById(R.id.tv); fr=new FileRead(); ReadNodesThread readThread=fr.new ReadNodesThread(); updateui=new Runnable()//更新UI的线程 { @Override public void run() { // TODO Auto-generated method stub int i=0; for(i=curi;i