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
)
