android获取网络地址通用方法
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方法一:通过NetworkInterface获得所有网络设备的ip地址(包括ipv4和ipv6地址)
实现一:
String networkIp = "";try { List<NetworkInterface> interfaces = Collections.list(NetworkInterface.getNetworkInterfaces()); for(NetworkInterface iface : interfaces){ if(iface.getDisplayName().equals("wlan0")){ List<InetAddress> addresses = Collections.list(iface.getInetAddresses()); for(InetAddress address : addresses){ if(address instanceof Inet4Address){ networkIp = address.getHostAddress(); } } } }} catch (SocketException e) { // TODO Auto-generated catch block e.printStackTrace();}?
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实现二:
String networkIp = "";try { Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); while(en.hasMoreElements()){ NetworkInterface ni = en.nextElement(); Log.i(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>",ni.getDisplayName()); Enumeration<InetAddress> enIp = ni.getInetAddresses(); while(enIp.hasMoreElements()){ InetAddress inet = enIp.nextElement(); if(!inet.isLoopbackAddress() && (inet instanceof Inet4Address)){ networkIp = inet.getHostAddress().toString(); } } } Log.i(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>", "getIp end");} catch (SocketException e) { // TODO Auto-generated catch block e.printStackTrace();}
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说明:
1.获取指定网络接口设备的地址,可通过NetworkInterface的getDisplayName()方法获取设备名称进行对比。
2.获取指定ipv4或者ipv6地址,可通过NetworkInterface的getInetAddress()方法获取到InetAddress列表进行遍历,对每个对象的类型进行判断即可(即instanceof Inet4Address或者Inet6Address)
3.推荐使用实现一,其实原理都是一样的,只因为实现一通过Collections的list方法将泛型Enumeration接口转换成List接口,代码更加简洁易懂。
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方法二:通过WifiInfo获得wifi的ipv4地址
WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);WifiInfo wifiInfo = wifiManager.getConnectionInfo();String networkIp = "";int hostAddress = (wifiInfo == null) ? 0 : wifiInfo.getIpAddress();byte[] addressByte = { (byte)(0xff & hostAddress), (byte)(0xff & (hostAddress >> 8)), (byte)(0xff & (hostAddress >> 16)), (byte)(0xff & (hostAddress >> 24))};InetAddress inet = null;try { inet = InetAddress.getByAddress(addressByte); networkIp = inet.getHostAddress().toString();} catch (UnknownHostException e) { // TODO Auto-generated catch block e.printStackTrace();}
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这种方法的局限性不言而喻,只能获取wifi的ipv4地址,且只能用于android设备,而NetworkInterface使用于所有可以使用java的设备上。
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