怎么在Android系统中添加服务

 //这是我们获取服务的路口 @Override public Object getSystemService(String name) {  //可以看到我们是从一个HashMap中拿的服务.  ServiceFetcher fetcher = SYSTEM_SERVICE_MAP.get(name);  return fetcher == null &#63; null : fetcher.getService(this); } private static final HashMap<String, ServiceFetcher> SYSTEM_SERVICE_MAP =    new HashMap<String, ServiceFetcher>(); //这是注册服务的方法,请注意是静态方法 private static void registerService(String serviceName, ServiceFetcher fetcher) {  if (!(fetcher instanceof StaticServiceFetcher)) {   fetcher.mContextCacheIndex = sNextPerContextServiceCacheIndex++;  }  SYSTEM_SERVICE_MAP.put(serviceName, fetcher); }