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

{

s+=tmp[i]+"\n";

}

tv.setText(s);

curi=i;

}};

readThread.start();

ReadListener updateThread=new ReadListener();

mHandler=new Handler();

updateThread.start();

}

}