android获取wifi的IP，子网掩码，网关，dns等信息

public class MainActivity extends Activity {
	
	private WifiManager my_wifiManager;
	private WifiInfo wifiInfo;
	private DhcpInfo dhcpInfo;

	private TextView tvResult;

	@Override
	protected 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);
	}

	@Override
	protected void onResume() {
		super.onResume();
		StringBuilder sb = new StringBuilder();
		sb.append("网络信息：");
		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信息：");
		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：

备注：

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();
        }
    }