判断是否有网

//需要权限
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

package com.bawei.week2.utils;

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

/**
 */
public class IsMobile {
    public static boolean isNetWorkUtils(Context context) {
        //创建网络管理器
        ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        //得到网络
        NetworkInfo info = manager.getActiveNetworkInfo();
        if (info != null){
            return info.isAvailable();
        }
        return false;
    }

}