handler2

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package com.example.handler_2;

import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.view.Menu;

public class MainActivity extends Activity {
private Handler handler = new Handler();

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  //handler.post(r); //如果把下面的Thread 注释掉，启用第一个那么不会新建线程，系统显示同一个id
  Thread t = new Thread(r);
  t.start();
  System.out.println("activity----->" + Thread.currentThread().getId());
  System.out.println("activityname----->"+ Thread.currentThread().getName());
}

Runnable r = new Runnable() {

  @Override
  public void run() {
   // TODO Auto-generated method stub
   System.out.println("handler----->" + Thread.currentThread().getId());
   System.out.println("handlername----->"+ Thread.currentThread().getName());
   try {
    Thread.sleep(10000);
   } catch (InterruptedException r) {
    r.printStackTrace();
   }
  }

};

@Override
public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
}

}