判断一个服务是否开启

 1     public static boolean isServiceRunning(Context context, String serviceName) {
 2         // 得到一个应用管理器, 如同windows中的任务管理器一样
 3         ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
 4         List<RunningServiceInfo> services = am.getRunningServices(100);
 5         for (RunningServiceInfo sInfo : services) {
 6             String runningServiceName = sInfo.service.getClassName();
 7             if(serviceName.equals(runningServiceName)){
 8                 return true;
 9             }
10         }
11         return false;
12     }