android 判断网络是否连接可用

// 判断网络是否正常
public static boolean isNetworkAvailable(Context context) {
ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity == null) {
return false;
} else {
NetworkInfo info = connectivity.getActiveNetworkInfo();
if (info == null) {
return false;
} else {
if (info.isAvailable()) {
return true;
}
}
}
return false;
}