学步园

在工作中我们经常要用到网络，网络状态的检查必不可少，这是一个检查当前网络状态的工具类，直接粘过去就能用：

package com.todoo.android.app.utils;

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;

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


public class NetworkUtils
{
	public static final String NET_TYPE_WIFI = "WIFI";
	public static final String NET_TYPE_MOBILE = "MOBILE";
	public static final String NET_TYPE_NO_NETWORK = "no_network";
	
	private Context mContext = null;
	
	public NetworkUtils(Context pContext) {
		this.mContext = pContext;
	}
	
	public static final String IP_DEFAULT = "0.0.0.0";

	public static boolean isConnectInternet(final Context pContext)
	{
		final ConnectivityManager conManager = (ConnectivityManager) pContext.getSystemService(Context.CONNECTIVITY_SERVICE);
		final NetworkInfo networkInfo = conManager.getActiveNetworkInfo();

		if (networkInfo != null)
		{
			return networkInfo.isAvailable();
		}

		return false;
	}
	
	public static boolean isConnectWifi(final Context pContext) {
		ConnectivityManager mConnectivity = (ConnectivityManager) pContext.getSystemService(Context.CONNECTIVITY_SERVICE);
		NetworkInfo info = mConnectivity.getActiveNetworkInfo();
		//判断网络连接类型，只有在3G或wifi里进行一些数据更新。  
		int netType = -1;
		if(info != null){
			netType = info.getType();
		}
		if (netType == ConnectivityManager.TYPE_WIFI) {
			return info.isConnected();
		} else {
			return false;
		}
	}

	public static String getNetTypeName(final int pNetType)
	{
		switch (pNetType)
		{
			case 0:
				return "unknown";
			case 1:
				return "GPRS";
			case 2:
				return "EDGE";
			case 3:
				return "UMTS";
			case 4:
				return "CDMA: Either IS95A or IS95B";
			case 5:
				return "EVDO revision 0";
			case 6:
				return "EVDO revision A";
			case 7:
				return "1xRTT";
			case 8:
				return "HSDPA";
			case 9:
				return "HSUPA";
			case 10:
				return "HSPA";
			case 11:
				return "iDen";
			case 12:
				return "EVDO revision B";
			case 13:
				return "LTE";
			case 14:
				return "eHRPD";
			case 15:
				return "HSPA+";
			default:
				return "unknown";
		}
	}

	public static String getIPAddress()
	{
		try
		{
			final Enumeration<NetworkInterface> networkInterfaceEnumeration = NetworkInterface.getNetworkInterfaces();

			while (networkInterfaceEnumeration.hasMoreElements())
			{
				final NetworkInterface networkInterface = networkInterfaceEnumeration.nextElement();

				final Enumeration<InetAddress> inetAddressEnumeration = networkInterface.getInetAddresses();

				while (inetAddressEnumeration.hasMoreElements())
				{
					final InetAddress inetAddress = inetAddressEnumeration.nextElement();

					if (!inetAddress.isLoopbackAddress())
					{
						return inetAddress.getHostAddress();
					}
				}
			}

			return NetworkUtils.IP_DEFAULT;
		}
		catch (final SocketException e)
		{
			return NetworkUtils.IP_DEFAULT;
		}
	}
	
	public String getConnTypeName() {
		ConnectivityManager connectivityManager = (ConnectivityManager) this.mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
		NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
		if(networkInfo == null) {
			return NET_TYPE_NO_NETWORK;
		} else {
			return networkInfo.getTypeName();
		}
	}
}

最后不要忘了加上权限：

<!-- 获取网络状态的权限 -->
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />