service

public class AskService extends Service
{
    public class SimpleBinder extends Binder
    {
        /**
         * 获取 Service 实例
         */
        public AskService getService()
        {
            return AskService.this;
        }
        public int add(int a, int b)
        {
            return a + b;
        }
    }
    public SimpleBinder sBinder;
    /**
     * 当启动Service的时候会调用这个方法
     */
    public void onCreate()
    {
        CommonUtil.log("create service");
        super.onCreate();
        sBinder = new SimpleBinder();
    }
    /**
     * 当系统被销毁的时候会调用这个方法
     */
    public void onDestroy()
    {
        CommonUtil.log("deatroy service");
        super.onDestroy();
    }
    public IBinder onBind(Intent intent)
    {
        return sBinder;
    }
    /**
     * 当启动Service的时候会调用这个方法
     */
    public int onStartCommand(Intent intent, int flags, int startId)
    {
        CommonUtil.log("start service");
        return super.onStartCommand(intent, flags, startId);
    }
}

Activity:private ServiceConnection sc;
    private boolean isBind;
sc = new ServiceConnection()
        {
            @Override
            public void onServiceDisconnected(ComponentName name) {
            }
           
            @Override
            public void onServiceConnected(ComponentName name, IBinder service) {
                AskService.SimpleBinder sBinder = (AskService.SimpleBinder)service;
                CommonUtil.log("3 + 5 = " + sBinder.add(3, 5));
                CommonUtil.log(sBinder.getService().toString());
            }
        };
        bindService(new Intent(Index.this, AskService.class), sc, Context.BIND_AUTO_CREATE);
        isBind = true;

CommonUtil.log("running service is:"+isMyServiceRunning());
private boolean isMyServiceRunning()
    {
        ActivityManager manager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
        for (RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE))
        {
            if ("com.huawei.voice.activity.AskService".equals(service.service.getClassName()))
            {
                return true;
            }
        }
        return false;
    }

AndroidManifest.xml:<service android:name=".activity.AskService" android:icon="@drawable/logo"
android:label="ask everyday"></service>