android 判断网络状态

android 判断网络状态

package com.example.android;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.URL;
import java.util.Enumeration;

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

public class NetStatus {

    public static int NET_CNNT_BAIDU_OK = 1; // 正常访问因特网状态
    public static int NET_CNNT_BAIDU_TIMEOUT = 2; // 无法访问因特网状态
    public static int NET_NOT_PREPARE = 3; // 网络未准备好
    public static int NET_ERROR = 4;
    private static int TIMEOUT = 3000;

    /**
     * 返回当前网络状态
     * 
     * @param context
     * @return
     */
    public static int getNetState(Context context) {
	try {
	    ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
	    if (connectivity != null) {
		NetworkInfo networkinfo = connectivity.getActiveNetworkInfo();
		if (networkinfo != null) {
		    if (networkinfo.isAvailable() && networkinfo.isConnected()) {
			if (!connectionNetwork())
			    return NET_CNNT_BAIDU_TIMEOUT;
			else
			    return NET_CNNT_BAIDU_OK;
		    } else {
			return NET_NOT_PREPARE;
		    }
		}
	    }
	} catch (Exception e) {
	}
	return NET_ERROR;
    }

    /**
     * 拼百度地址
     * 
     * @return
     */
    private static boolean connectionNetwork() {
	boolean result = false;
	HttpURLConnection httpUrl = null;
	try {
	    httpUrl = (HttpURLConnection) new URL("http://www.baidu.com").openConnection();
	    httpUrl.setConnectTimeout(TIMEOUT);
	    httpUrl.connect();
	    result = true;
	} catch (IOException e) {
	} finally {
	    if (null != httpUrl) {
		httpUrl.disconnect();
	    }
	    httpUrl = null;
	}
	return result;
    }

    /**
     * 判断当前网络是否是3G网络
     * 
     * @param context
     * @return boolean
     */
    public static boolean is3G(Context context) {
	ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
	NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();
	if (activeNetInfo != null && activeNetInfo.getType() == ConnectivityManager.TYPE_MOBILE) {
	    return true;
	}
	return false;
    }

    /**
     * 判断当前网络是否是wifi网络
     * 
     * @param context
     * @return boolean
     */
    public static boolean isWifi(Context context) {
	ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
	NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();
	if (activeNetInfo != null && activeNetInfo.getType() == ConnectivityManager.TYPE_WIFI) {
	    return true;
	}
	return false;
    }

    /**
     * 判断当前网络是否是2G网络
     * 
     * @param context
     * @return boolean
     */
    public static boolean is2G(Context context) {
	ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
	NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();
	if (activeNetInfo != null && (activeNetInfo.getSubtype() == TelephonyManager.NETWORK_TYPE_EDGE
			|| activeNetInfo.getSubtype() == TelephonyManager.NETWORK_TYPE_GPRS 
			|| activeNetInfo.getSubtype() == TelephonyManager.NETWORK_TYPE_CDMA)) {
	    return true;
	}
	return false;
    }

    /**
     * wifi是否打开
     */
    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);
    }

    /**
     * 获得本机ip地址
     * 
     * @return
     */
    public static String GetHostIp() {
	try {
	    for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
		NetworkInterface intf = en.nextElement();
		for (Enumeration<InetAddress> ipAddr = intf.getInetAddresses(); ipAddr.hasMoreElements();) {
		    InetAddress inetAddress = ipAddr.nextElement();
		    if (!inetAddress.isLoopbackAddress()) {
			return inetAddress.getHostAddress();
		    }
		}
	    }
	} catch (SocketException ex) {
	} catch (Exception e) {
	}
	return null;
    }

    /**
     * 获取本机串号imei
     * 
     * @param context
     * @return
     */
    public static String getIMEI(Context context) {
	TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
	return telephonyManager.getDeviceId();
    }
}

添加权限：访问网络权限

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>  
<uses-permission android:name="android.permission.INTERNET"/>