通过Activity的onCreate检测服务可用性

List<ActivityManager.RunningServiceInfo> getRunningServices (int maxNum)

ActivityMAnager am = (ActivityManager)getSystemService(Context.ACTIVITY_SERVICE);
ArrayList<ActivityManager.RunningServiceInfo> rsiList = am.getRunningServices (999);
boolean found = null;
for (ActivityManager.RunningServiceInfo rsi: rsiList) {
    if (rsi.service.getPackageName().equals(\"MYPACKAGE\") {
       found = true;
       break;
    }
}
if (found) {
    // do whatever
} else {
    // alternative
}