Android bestimmt, ob es sich um WLAN oder 4G-Netzwerk handelt

package com.chengxinet.bobo.utils;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.telephony.TelephonyManager;
/**
 * Created by Administrator on 2016/1/7.
 */
public class NetworkUtils {
    public static boolean isNetworkAvailable(Context c) {
        Context context = c.getApplicationContext();
        // 获取手机所有连接管理对象（包括对wi-fi,net等连接的管理）
        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        if (connectivityManager == null) {
            return false;
        } else {
            // 获取NetworkInfo对象
            NetworkInfo[] networkInfo = connectivityManager.getAllNetworkInfo();
            if (networkInfo != null && networkInfo.length > 0) {
                for (NetworkInfo aNetworkInfo : networkInfo) {
//                    System.out.println(i + "===状态===" + networkInfo[i].getState());
//                    System.out.println(i + "===类型===" + networkInfo[i].getTypeName());
                    // 判断当前网络状态是否为连接状态
                    if (aNetworkInfo.getState() == NetworkInfo.State.CONNECTED) {
                        return true;
                    }
                }
            }
        }
        return false;
    }
    /**
     * 判断WIFI是否打开
     * @param context
     * @return
     */
    public static boolean isWifiEnabled(Context context) {
        ConnectivityManager mgrConn = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        TelephonyManager mgrTel = (TelephonyManager) context
                .getSystemService(Context.TELEPHONY_SERVICE);
        return ((mgrConn.getActiveNetworkInfo() != null && mgrConn
                .getActiveNetworkInfo().getState() == NetworkInfo.State.CONNECTED) || mgrTel
                .getNetworkType() == TelephonyManager.NETWORK_TYPE_UMTS);
    }
    /**
     * 判断是否是3G网络
     * @param context
     * @return
     */
    public static boolean is3rd(Context context) {
        ConnectivityManager cm = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkINfo = cm.getActiveNetworkInfo();
        if (networkINfo != null
                && networkINfo.getType() == ConnectivityManager.TYPE_MOBILE) {
            return true;
        }
        return false;
    }
    /**
     * 判断是wifi还是3g网络
     * @param context
     * @return
     */
    public static boolean isWifi(Context context) {
        ConnectivityManager cm = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkINfo = cm.getActiveNetworkInfo();
        if (networkINfo != null
                && networkINfo.getType() == ConnectivityManager.TYPE_WIFI) {
            return true;
        }
        return false;
    }
}