android 线程超时的例证

import java.util.Timer;　　import java.util.TimerTask;　　import android.app.Activity;　　import android.app.AlertDialog;　　import android.app.Dialog;　　import android.content.Intent;　　import android.os.Bundle;　　import android.os.Handler;　　import android.os.Looper;　　import android.os.Message;　　import android.view.View;　　import android.view.View.OnClickListener;　　import android.widget.Button;　　/**　　* @author Tony Shen　　*　　*/　　public class Main extends Activity {private Button button;　　private Timer timer;　　private final int TIMER_EXECUTE = 1;　　private final int ERROR_MESSAGE = 1;　　private final int CHECK_TIME = 5000;　　private EThread eThread;　　/** Called when the activity is first created. */[email protected]　　public void onCreate(Bundle savedInstanceState) {　　super.onCreate(savedInstanceState);　　setContentView(R.layout.main);　　button = (Button) findViewById(R.id.btn);　　button.setOnClickListener(new OnClickListener() {　　public void onClick(View v) {　　//timer for check the thread　　timer = new Timer();　　timer.schedule(new TimerTask(){[email protected]　　public void run() {　　checkThread();　　}　　},CHECK_TIME);　　eThread = new EThread();　　eThread.start();　　}　　});　　}[email protected]　　protected Dialog onCreateDialog(int id) {　　return new AlertDialog.Builder(this).setTitle("错误")　　.setMessage("线程超时!").create();　　}　　private Handler mHandler = new Handler() {　　public void handleMessage(Message msg) {　　switch(msg.what){　　case TIMER_EXECUTE:　　if (eThread.getState().toString().equals("TERMINATED")||　　eThread.getState().toString().equals("TIMED_WAITING")) {　　eThread.stopThread(true);　　showDialog(ERROR_MESSAGE);　　timer.cancel();// 关闭计时器　　}　　break;　　}　　super.handleMessage(msg);　　}　　};　　protected void checkThread() {　　Message msg = new Message();　　msg.what = TIMER_EXECUTE;　　mHandler.sendMessage(msg);　　}　　class EThread extends Thread {　　private boolean flag = true;　　public void stopThread(boolean flag) {this.flag = !flag;　　}[email protected]　　public void run() {　　Looper.prepare();　　try {　　Thread.sleep(6000);　　} catch (InterruptedException e) {　　e.printStackTrace();　　}　　timer.cancel();// 关闭计时器　　if(!flag) {　　return;　　}　　Intent i = new Intent(Main.this,SecondActivity.class);　　startActivity(i);　　}　　}　　}