Android笔记（1）网络 wifi等判断
Context context = listActivity.getApplicationContext();//获取应用上下文ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);//获取系统的连接服务NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();//获取网络的连接情况if(activeNetInfo.getType()==ConnectivityManager.TYPE_WIFI){//判断WIFI网}else if(activeNetInfo.getType()==ConnectivityManager.TYPE_MOBILE) {//判断3G网