Android 判断网络状态实例详解
实例代码
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"/>
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