package lan.activity; import android.app.IntentService; import android.content.Intent; import android.util.Log; public class HelloIntentService extends IntentService { //传入父类构造方法的字符串将作为工作线程的名字,如IntentService[HelloIntentService] public HelloIntentService() { super("HelloIntentService"); } @Override protected void onHandleIntent(Intent intent) { Log.v("VERBOSE", Thread.currentThread().getName()); try { Thread.sleep(5000); } catch (InterruptedException e) { e.printStackTrace(); } } @Override public void onCreate() { Log.v("VERBOSE", "Create HelloIntentService"); super.onCreate(); } @Override public void onDestroy() { Log.v("VERBOSE", "Destroy HelloIntentService"); super.onDestroy(); } @Override public int onStartCommand(Intent intent, int flags, int startId) { Log.v("VERBOSE", "Start Command HelloIntentService"); return super.onStartCommand(intent, flags, startId); } }
连续3次启动HelloService,输出如下图所示:
1.IntentService会创建一个工作队列,启动服务时会有个intent传给onStartCommand()方法;
2.onStartCommand()方法的默认实现会把intent传递到工作队列中;
3.IntentService会创建一个工作线程一次从工作队列中获取intent,然后调用onHandleIntent()方法;
4.完成服务后会自动调用selfstop()方法;
因此IntentService不适合执行多个请求并发执行的情况。