如何判断Android手机当前是否联网

渣方法

public static String isNetworkAvailable(Context context) { ConnectivityManager cm = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); if (cm == null) { return "没有网络"; } else { NetworkInfo[] info = cm.getAllNetworkInfo(); if (info != null) { for (int i = 0; i < info.length; i++) { if (info[i].getState() == NetworkInfo.State.CONNECTED) { return "有网络"; } } } } return "没有网络"; }