android 检查网络

 NetWorkUtils

package com.example.tomorrow.MobileOA.utils;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

/**
 * Created by he on 11/9 2015.
 */
public class NetWorkUtils {

    public static boolean isNetworkAvailable(Context context) {
        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(
                Context.CONNECTIVITY_SERVICE);
        if (cm == null) {

        } else {
            //如果仅仅是用来判断网络连接
            //则可以使用 cm.getActiveNetworkInfo().isAvailable();
            NetworkInfo[] info = cm.getAllNetworkInfo();
            if (info != null) {
                for (int i = 0; i < info.length; i++) {
                    if (info[i].getState() == NetworkInfo.State.CONNECTED) {
                        return true;
                    }
                }
            }
        }
        return false;
    }
}