文件名:networkInfo.java

package com.jao.other.functions;



import android.content.Context;

import android.content.Intent;

import android.net.ConnectivityManager;

import android.provider.Settings;

import android.util.Log;



public class networkInfo {





	public static boolean checkNetworkInfo(Context context){

		Context c=context;

        ConnectivityManager conMan = (ConnectivityManager) c.getSystemService(Context.CONNECTIVITY_SERVICE);



        //mobile 3G Data Network

        android.net.NetworkInfo.State mobile = conMan.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();

        Log.v("3G",String.valueOf(mobile));  //CONNECTED ||DISCONNECTED



        //wifi

        android.net.NetworkInfo.State wifi = conMan.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();

        Log.v("WIFI",String.valueOf(wifi));  //NOKNOWN || CONNECTED  ||DISCONNECTED

        

        //如果3G网络和wifi网络都未连接，且不是处于正在连接状态 则进入Network Setting界面 由用户配置网络连接

        if(mobile==android.net.NetworkInfo.State.CONNECTED||mobile==android.net.NetworkInfo.State.CONNECTING)

            return true;

        if(wifi==android.net.NetworkInfo.State.CONNECTED||wifi==android.net.NetworkInfo.State.CONNECTING)

            return true;

        

		return false;

        

    }

	

	public static void changeNetwork(Context context){

		context.startActivity(new Intent(Settings.ACTION_WIRELESS_SETTINGS));//进入无线网络配置界面

	}

}

调用方法:

首先是权限配置:<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>

boolean state=networkInfo.checkNetworkInfo(context);

if(!state){

    networkInfo.changeNetwork(context); 

}