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。
[图片] 1.jpg
[图片] 2.jpg
[代码] main.xml布局文件
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<?xml version="1.0" encoding="utf-8"?>
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<ScrollView
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xmlns:Android="http://schemas.android.com/apk/res/android"
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Android:layout_height="wrap_content" android:id="@+id/scrollView1"android:layout_width="fill_parent">
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<LinearLayout Android:id="@+id/linearLayout1"
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Android:orientation="vertical"
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Android:layout_width="fill_parent"
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Android:layout_height="wrap_content">
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<TextView
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Android:id="@+id/tv"
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Android:layout_width="fill_parent"
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Android:layout_height="wrap_content"
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/>
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</LinearLayout>
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</ScrollView>
[代码] FileRead.java
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public class FileRead {
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boolean readend=false;
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List<String> al=null;
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publicclass ReadNodesThread extends Thread{//读取线程
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public void run()
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{
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al=new ArrayList<String>(100);
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al.clear();
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readend=false;
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int i=0;
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try {
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RandomAccessFile raf=new RandomAccessFile("/sdcard/test.txt","r");
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//try {
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while(raf.getFilePointer()<raf.length())
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{
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al.add(raf.readLine());
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//sleep(100);//如果测试文件太小，这里休眠是为了测试，
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}
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} catch (Exception e1) {
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// TODO Auto-generated catch block
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e1.printStackTrace();
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}
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readend=true;
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}
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};
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}
[代码] MultiThreadActivity.java
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public class MultiThreadActivity extends Activity {
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FileRead fr=null;
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Handler mHandler=null;
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int curi=0;
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Runnable updateui=null;
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String[] tmp=null;
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String s="";
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TextView tv=null;
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class ReadListener extends Thread{//监听线程，当数据更新数目大于10条时，更新UI
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public void run()
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{
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int i=0,newi=0;
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while(!fr.readend)
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{
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newi=fr.al.size();
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if((newi-i)>10)//新增数据大于10条，更新UI
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{
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i=newi;
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tmp=(String[])fr.al.toArray(new String[fr.al.size()]);
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mHandler.post(updateui);
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try {
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Thread.sleep(100);
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} catch (InterruptedException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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}
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}
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//数据读完了
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tmp=(String[])fr.al.toArray(new String[fr.al.size()]);
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mHandler.post(updateui);
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try {
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Thread.sleep(100);
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} catch (InterruptedException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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}
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};
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.main);
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tv=(TextView)findViewById(R.id.tv);
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fr=new FileRead();
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ReadNodesThread readThread=fr.new ReadNodesThread();
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updateui=new Runnable()//更新UI的线程
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{
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@Override
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public void run() {
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// TODO Auto-generated method stub
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int i=0;
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for(i=curi;i<tmp.length;i++)
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{
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s+=tmp[i]+"\n";
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}
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tv.setText(s);
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curi=i;
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}};
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readThread.start();
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ReadListener updateThread=new ReadListener();
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mHandler=new Handler();
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updateThread.start();
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}
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}
