概念：
Service是应用组件（运行在宿主进程的主线程中，或重新开启一个子线程），执行长时间运行操作，或为其它应用提供功能函数，每个Service必须在工程的AndroidManifest.xml中进行声明，开启Service以Context.startService()或Context.bindService()方式。
生命周期：
=========MainActivity.java==============
package com.xuwan.service;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
/**
* 本地Service
*
* @author SJC
*
*/
public class MainActivity extends Activity implements OnClickListener {
private static String tag = "MainActivity";
private LocalService localService = null;
private Boolean isBind = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button startServiceButton = (Button) findViewById(R.id.startService);
Button stopServiceButton = (Button) findViewById(R.id.stopService);
Button bindServiceButton = (Button) findViewById(R.id.bindService);
Button unbindServiceButton = (Button) findViewById(R.id.unbindService);
startServiceButton.setOnClickListener(this);
stopServiceButton.setOnClickListener(this);
bindServiceButton.setOnClickListener(this);
unbindServiceButton.setOnClickListener(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public void onClick(View v) {
if (v.getId() == R.id.startService) {
Log.i(tag, "==========启动服务==========");
Intent service = new Intent(this, LocalService.class);
startService(service);
} else if (v.getId() == R.id.stopService) {
Log.i(tag, "==========ֹͣ停止服务==========");
Intent service = new Intent(this, LocalService.class);
stopService(service);
} else if (v.getId() == R.id.bindService) {
Log.i(tag, "==========ֹͣ绑定服务==========");
Intent service = new Intent(this, LocalService.class);
bindService(service, serviceConnection, Context.BIND_AUTO_CREATE);
isBind = true;
} else if (v.getId() == R.id.unbindService) {
Log.i(tag, "==========ֹͣ卸载服务==========");
if (isBind) {
unbindService(serviceConnection);
isBind = false;
}
}
}
private ServiceConnection serviceConnection = new ServiceConnection() {
@Override
public void onServiceDisconnected(ComponentName name) {
Log.i(tag, "onServiceDisconnected===" + "name:" + name);
localService = null;
}
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
Log.i(tag, "onServiceConnected===" + "name:" + name);
localService = ((LocalService.LocalBinder) service)
.getLocalService();
}
};
}
=========LocalService.java==============
/**
*
*/
package com.xuwan.service;
import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;
/**
* @author SJC
*
*/
public class LocalService extends Service {
private static String tag = "LocalService";
private Binder binder = new LocalService.LocalBinder();
private MediaPlayer mp = null;
@Override
public IBinder onBind(Intent intent) {
Log.i(tag, "onBind");
return binder;
}
@Override
public void onCreate() {
Log.i(tag, "onCreate");
mp = MediaPlayer.create(this, R.raw.dongshi_sunyanzi);
mp.start();
super.onCreate();
}
@Override
public void onStart(Intent intent, int startId) {
Log.i(tag, "onStart");
super.onStart(intent, startId);
}
/**
* <1>START_CONTINUATION_MASK<br/>
* <2>START_FLAG_REDELIVERY<br/>
* <3>START_FLAG_RETRY<br/>
* <4>START_NOT_STICKY 如果进程被kill掉，系统将不会自动重新该Service<br/>
* <5>START_REDELIVER_INTENT
* 如果进程被kill掉，保留Service的状态和intent对象，随后系统会自动重启Service<br/>
* <6>START_STICKY 如果进程被kill掉，保留Service的状态为开始状态，但不会保留传递的intent对象；
* 随后系统会自动重启Service<br/>
* <7>START_STICKY_COMPATIBILITY START_STICKY的兼容版本，
* 并不能保证进程被kill掉后会调用onStartCommand()方法<br/>
*/
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.i(tag, "onStartCommand" + "|" + "flags:" + flags + "|" + "startId:"
+ startId);
return START_STICKY;
}
@Override
public boolean onUnbind(Intent intent) {
Log.i(tag, "onUnbind");
return super.onUnbind(intent);
}
@Override
public void onDestroy() {
Log.i(tag, "onDestroy");
mp.stop();
super.onDestroy();
}
public class LocalBinder extends Binder {
LocalService getLocalService() {
return LocalService.this;
}
}
}
<1>当执行“启动服务”时，打印信息如下：
<2>当执行“停止服务”时，打印信息如下：
<3>当执行“绑定服务”时，打印信息如下：
<4>当执行“卸载服务”时，打印信息如下：
