Android（java）学习笔记210：Android线程形态之 IntentService

@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 + "]");
thread.start();

mServiceLooper = thread.getLooper();
mServiceHandler = new ServiceHandler(mServiceLooper);
}

 private final class ServiceHandler extends Handler {
public ServiceHandler(Looper looper) {
super(looper);
}

@Override
public void handleMessage(Message msg) {
onHandleIntent((Intent)msg.obj);
stopSelf(msg.arg1);
}
}

  @Override
public int onStartCommand(Intent intent, int flags, int startId) {
onStart(intent, startId);
return mRedelivery ? START_REDELIVER_INTENT : START_NOT_STICKY;
}

@Override
public void onStart(Intent intent, int startId) {
Message msg = mServiceHandler.obtainMessage();
msg.arg1 = startId;
msg.obj = intent;
mServiceHandler.sendMessage(msg);
}

package com.himi.intentservicedemo;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;

public class MainActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

/**
* 可以启动多次，每启动一次，就会新建一个work thread
* 但IintentService的实例始终只有一个
*/
// Operation 1
Intent startServiceIntent = new Intent(this,MyIntentService.class);
Bundle bundle = new Bundle();
bundle.putString("param", "oper1");
startServiceIntent.putExtras(bundle);
startService(startServiceIntent);

// Operation 2
Intent startServiceIntent2 = new Intent(this,MyIntentService.class);
Bundle bundle2 = new Bundle();
bundle2.putString("param", "oper2");
startServiceIntent2.putExtras(bundle2);
startService(startServiceIntent2);
}
}

package com.himi.intentservicedemo;

import android.app.IntentService;
import android.content.Intent;
import android.os.IBinder;

public class MyIntentService extends IntentService {

public MyIntentService() {
// 必须实现父类的构造方法
super("IntentServiceDemo");
}

@Override
public IBinder onBind(Intent intent) {
System.out.println("onBind");
return super.onBind(intent);
}

@Override
public void onCreate() {
System.out.println("onCreate");
super.onCreate();
}

@Override
public void onStart(Intent intent, int startId) {
System.out.println("onStart");
super.onStart(intent, startId);
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
System.out.println("onStartCommand");
return super.onStartCommand(intent, flags, startId);
}

@Override
public void setIntentRedelivery(boolean enabled) {
super.setIntentRedelivery(enabled);
System.out.println("setIntentRedelivery");
}

@Override
protected void onHandleIntent(Intent intent) { //这个方法在子线程中执行，因此需要用到handler跟主线程进行通信
// Iintent是从Activity发过来的，携带识别参数，根据参数不同执行不同的任务
String action = intent.getExtras().getString("param");
if (action.equals("oper1")) {
System.out.println("Operation1");
} else if (action.equals("oper2")) {
System.out.println("Operation2");
}

try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}

@Override
public void onDestroy() {
System.out.println("onDestroy");
super.onDestroy();
}

}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.himi.intentservicedemo"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="15"
android:targetSdkVersion="17" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

<service
android:name="MyIntentService">
</service>

</application>

</manifest>