android如何获取后台正在运行的service

给一段获取正在运行的后台service的代码，如下：

//RunningServicesInfo
public static String getRunningServicesInfo(Context context) {
StringBuffer serviceInfo = new StringBuffer();
final ActivityManager activityManager = (ActivityManager) context
.getSystemService(Context.ACTIVITY_SERVICE);
List services = activityManager.getRunningServices(100);
Iterator l = services.iterator();
while (l.hasNext()) {
RunningServiceInfo si = (RunningServiceInfo) l.next();
serviceInfo.append("pid: ").append(si.pid);
serviceInfo.append("\nprocess: ").append(si.process);
serviceInfo.append("\nservice: ").append(si.service);
serviceInfo.append("\ncrashCount: ").append(si.crashCount);
serviceInfo.append("\nclientCount: ").append(si.clientCount);
serviceInfo.append("\nactiveSince: ").append(ToolHelper.formatData(si.activeSince));
serviceInfo.append("\nlastActivityTime: ").append(ToolHelper.formatData(si.lastActivityTime));
serviceInfo.append("\n\n");
}
return serviceInfo.toString();
}

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