本文通过例子来验证和说明使用Handler对象开启的线程是否和主线程为在同一线程中。
程序结构图如下:
[1] HandlerActivity.java中的源码如下:
- package com.andyidea.handlerdemo2;
- import android.app.Activity;
- import android.os.Bundle;
- import android.os.Handler;
- import android.os.HandlerThread;
- import android.os.Looper;
- import android.os.Message;
- import android.util.Log;
- public class HandlerActivity extends Activity {
- private Handler handler = new Handler();
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- //handler.post(r);
- setContentView(R.layout.main);
- Log.e("activity-->" ,Thread.currentThread().getId() + "");
- Log.e("activityname-->" ,Thread.currentThread().getName() + "");
- //与主线程同一线程
- handler.post(r);
- //与主线程不同线程
- HandlerThread handlerThread = new HandlerThread("handler_thread");
- handlerThread.start();
- //HandlerThread线程对象要启动后,
- //通过handlerThread.getLooper()方法才能获得Looper对象
- MyHandler myHandler = new MyHandler(handlerThread.getLooper());
- Message msg = myHandler.obtainMessage();
- msg.sendToTarget(); //发送消息的方式
- }
- //创建一个线程对象
- Runnable r = new Runnable() {
- @Override
- public void run() {
- Log.e("handler-->" ,Thread.currentThread().getId() + "");
- Log.e("handlername-->" ,Thread.currentThread().getName() + "");
- try{
- Thread.sleep(10*1000);
- }catch(InterruptedException e){
- e.printStackTrace();
- }
- }
- };
- //创建Handler对象
- class MyHandler extends Handler{
- public MyHandler(){