标签:com top 启动 param stop bug 管理 并且 deb
IntentService是继承并处理异步请求的一个类,在IntentService内有一个工作线程来处理耗时操作,启动IntentService的方式和启动传统的Service一样,同时,当任务执行完后,IntentService会自动停止,而不需要我们手动去控制或stopSelf()。另外,可以启动IntentService多次,而每一个耗时操作会以工作队列的方式在IntentService的onHandleIntent回调方法中执行,并且,每次只会执行一个工作线程,执行完第一个再执行第二个,以此类推。
先来看一下IntentService类的源码:
public void onCreate() { // TODO: It would be nice to have an option to hold a partial wakelock // during processing, and to have a static startService(Context, Intent) // method that would launch the service & hand off a wakelock. super.onCreate(); HandlerThread thread = new HandlerThread("IntentService[" + mName + "]"); thread.start(); //开启一个工作线程 mServiceLooper = thread.getLooper(); //单独的消息队列 mServiceHandler = new ServiceHandler(mServiceLooper); }
定义一个IntentService的子类:
public class MIntentService extends IntentService { public MIntentService(){ super("MIntentService"); } /** * Creates an IntentService. Invoked by your subclass‘s constructor. * @param name Used to name the worker thread, important only for debugging. */ public MIntentService(String name) { super(name); } @Override public void onCreate() { Log.e("MIntentService--", "onCreate"); super.onCreate(); } @Override public int onStartCommand(Intent intent, int flags, int startId) { Log.e("MIntentService--", "onStartCommand"); return super.onStartCommand(intent, flags, startId); } @Override protected void onHandleIntent(Intent intent) { Log.e("MIntentService--", Thread.currentThread().getName() + "--" + intent.getStringExtra("info") ); for(int i = 0; i < 100; i++){ //耗时操作 Log.i("onHandleIntent--", i + "--" + Thread.currentThread().getName()); } } @Override public void onDestroy() { Log.e("MIntentService--", "onDestroy"); super.onDestroy(); } }
开启IntentService服务:
public void intentClick(View v){ Intent intent = new Intent(this, MIntentService.class); intent.putExtra("info", "good good study"); startService(intent); }
点击按钮之后输出结果为(过滤log.e):
10-25 16:54:58.852 27135-27135/com.example.lenovo.myintentservicedemo E/MIntentService--﹕ onCreate
10-25 16:54:58.852 27135-27135/com.example.lenovo.myintentservicedemo E/MIntentService--﹕ onStartCommand
10-25 16:54:58.856 27135-27354/com.example.lenovo.myintentservicedemo E/MIntentService--﹕ IntentService[MIntentService]--good good study
10-25 16:54:58.879 27135-27135/com.example.lenovo.myintentservicedemo E/MIntentService--﹕ onDestroy
Intent服务开启后,执行完onHandleIntent里面的任务就自动销毁结束,通过打印的线程名称可以发现是新开了一个线程来处理耗时操作的,即是耗时操作也可以被这个线程管理和执行,同时不会产生ANR的情况。
标签:com top 启动 param stop bug 管理 并且 deb
原文地址:http://www.cnblogs.com/denluoyia/p/5997452.html