android判断服务是否是运行状态

/**

     * 判断服务是否处于运行状态.

     * @param servicename

     * @param context

     * @return

     */

    public static boolean isServiceRunning(String servicename,Context context){

        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);

        List<RunningServiceInfo>  infos = am.getRunningServices(100);

        for(RunningServiceInfo info: infos){

            if(servicename.equals(info.service.getClassName())){

                return true;

            }

        }

        return false;

    }