android擷取wifi的IP，子網路遮罩，網關，dns等資訊

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public class MainActivity extends Activity {private WifiManager my_wifiManager;private WifiInfo wifiInfo;private DhcpInfo dhcpInfo;private TextView tvResult;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);my_wifiManager = ((WifiManager) getSystemService("wifi"));dhcpInfo = my_wifiManager.getDhcpInfo();wifiInfo = my_wifiManager.getConnectionInfo();tvResult = (TextView) findViewById(R.id.tvResult);}@Overrideprotected void onResume() {super.onResume();StringBuilder sb = new StringBuilder();sb.append("網路資訊：");sb.append("\nipAddress：" + intToIp(dhcpInfo.ipAddress));sb.append("\nnetmask：" + intToIp(dhcpInfo.netmask));sb.append("\ngateway：" + intToIp(dhcpInfo.gateway));sb.append("\nserverAddress：" + intToIp(dhcpInfo.serverAddress));sb.append("\ndns1：" + intToIp(dhcpInfo.dns1));sb.append("\ndns2：" + intToIp(dhcpInfo.dns2));sb.append("\n");System.out.println(intToIp(dhcpInfo.ipAddress));System.out.println(intToIp(dhcpInfo.netmask));System.out.println(intToIp(dhcpInfo.gateway));System.out.println(intToIp(dhcpInfo.serverAddress));System.out.println(intToIp(dhcpInfo.dns1));System.out.println(intToIp(dhcpInfo.dns2));System.out.println(dhcpInfo.leaseDuration);sb.append("Wifi資訊：");sb.append("\nIpAddress：" + intToIp(wifiInfo.getIpAddress()));sb.append("\nMacAddress：" + wifiInfo.getMacAddress());tvResult.setText(sb.toString());}private String intToIp(int paramInt) {return (paramInt & 0xFF) + "." + (0xFF & paramInt >> 8) + "." + (0xFF & paramInt >> 16) + "."+ (0xFF & paramInt >> 24);}}

效果例如以下：

備忘：

android.net.NetworkUtils

    /**     * Convert a IPv4 address from an integer to an InetAddress.     * @param hostAddress an int corresponding to the IPv4 address in network byte order     */    public static InetAddress intToInetAddress(int hostAddress) {        byte[] addressBytes = { (byte)(0xff & hostAddress),                                (byte)(0xff & (hostAddress >> 8)),                                (byte)(0xff & (hostAddress >> 16)),                                (byte)(0xff & (hostAddress >> 24)) };        try {           return InetAddress.getByAddress(addressBytes);        } catch (UnknownHostException e) {           throw new AssertionError();        }    }

android擷取wifi的IP，子網路遮罩，網關，dns等資訊