service与IntentService 区别
2015-04-07 00:53
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关系:
IntentService继承service
区别:
IntentService 是一个带有HandlerThread的线程的service,把任务执行完成以后IntentService自动销毁。
Service要手动 调用stopSelf()来销毁。
IntentService 运行在子线程中,Service运行在主线程中
作用:
IntentService 用于执行一次复杂的场景使用IntentService相对好一点
Service 用于重复执行的场景
代码分析:
IntentService 运行在子线程中,Service运行在主线程中
MyService 继承Service
MyIntentService 继承IntentService
运行结果:
04-07 00:41:58.245: I/System.out(5107): MyService ===== 所在的线程 Thread[main,5,main]
04-07 00:41:58.255: I/System.out(5107): MyIntentService ===== 所在的线程 Thread[IntentService[lihao],5,main]
为什么MyIntentService 会在IntentService[lihao]这个线程中
从源代码的41-45行中 IntentService 中维护了一个HandlerThread 和一个Handler 很容易看到我们继承的IntentService的线程的名字
由于HandlerThread是个子线程start以后生成了loop传给Handler所以Handler运行在子线程里面然后,Handler发送消息,,接收到消息以后
会调用handleMessage()方法这个方法里面又调用了onHandleIntent(),这个方法执行完成后调用stopSelf() 13-14行代码,Service将自动销毁。
IntentService继承service
区别:
IntentService 是一个带有HandlerThread的线程的service,把任务执行完成以后IntentService自动销毁。
Service要手动 调用stopSelf()来销毁。
IntentService 运行在子线程中,Service运行在主线程中
作用:
IntentService 用于执行一次复杂的场景使用IntentService相对好一点
Service 用于重复执行的场景
代码分析:
IntentService 运行在子线程中,Service运行在主线程中
MyService 继承Service
package com.example.activitynate; import android.app.Service; import android.content.Intent; import android.os.IBinder; public class MyService extends Service { @Override public IBinder onBind(Intent intent) { return null; } @Override public int onStartCommand(Intent intent, int flags, int startId) { System.out.println("MyService ===== 所在的线程 "+Thread.currentThread()); return super.onStartCommand(intent, flags, startId); } }
MyIntentService 继承IntentService
package com.example.activitynate; import android.app.IntentService; import android.content.Intent; public class MyIntentService extends IntentService { public MyIntentService(String name) { super(name); } public MyIntentService() { this("lihao"); } @Override protected void onHandleIntent(Intent intent) { System.out.println("MyIntentService ===== 所在的线程 "+Thread.currentThread()); } }
运行结果:
04-07 00:41:58.245: I/System.out(5107): MyService ===== 所在的线程 Thread[main,5,main]
04-07 00:41:58.255: I/System.out(5107): MyIntentService ===== 所在的线程 Thread[IntentService[lihao],5,main]
为什么MyIntentService 会在IntentService[lihao]这个线程中
public abstract class IntentService extends Service { private volatile Looper mServiceLooper; private volatile ServiceHandler mServiceHandler; private String mName; private boolean mRedelivery; private final class ServiceHandler extends Handler { public ServiceHandler(Looper looper) { super(looper); } @Override public void handleMessage(Message msg) { onHandleIntent((Intent)msg.obj); 15 stopSelf(msg.arg1); } } /** * Creates an IntentService. Invoked by your subclass's constructor. * * @param name Used to name the worker thread, important only for debugging. */ public IntentService(String name) { super(); mName = name; } public void setIntentRedelivery(boolean enabled) { mRedelivery = enabled; } @Override 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 + "]"); 42 thread.start(); 43 44 mServiceLooper = thread.getLooper(); 45 mServiceHandler = new ServiceHandler(mServiceLooper); } @Override public void onStart(Intent intent, int startId) { Message msg = mServiceHandler.obtainMessage(); msg.arg1 = startId; msg.obj = intent; mServiceHandler.sendMessage(msg); } @Override public int onStartCommand(Intent intent, int flags, int startId) { onStart(intent, startId); return mRedelivery ? START_REDELIVER_INTENT : START_NOT_STICKY; } @Override public void onDestroy() { mServiceLooper.quit(); } /** * Unless you provide binding for your service, you don't need to implement this * method, because the default implementation returns null. * @see android.app.Service#onBind */ @Override public IBinder onBind(Intent intent) { return null; } protected abstract void onHandleIntent(Intent intent); }
从源代码的41-45行中 IntentService 中维护了一个HandlerThread 和一个Handler 很容易看到我们继承的IntentService的线程的名字
由于HandlerThread是个子线程start以后生成了loop传给Handler所以Handler运行在子线程里面然后,Handler发送消息,,接收到消息以后
会调用handleMessage()方法这个方法里面又调用了onHandleIntent(),这个方法执行完成后调用stopSelf() 13-14行代码,Service将自动销毁。
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