getHostAddress（）返回一个反转IP地址 [英] getHostAddress() returns a reversed ip adress

问题描述

我试图用WifiManager和WifiInfo类获取我的手机的IP地址。

I'm trying to get my cell phone ip address by using WifiManager and WifiInfo classes.

它返回正确的IP地址逆转。

It returns correct ip address reversed.

public String getWifiIpAddress() {
    WifiManager wm = (WifiManager) getSystemService(WIFI_SERVICE);
    WifiInfo wi = wm.getConnectionInfo();

    byte[] ipAddress = BigInteger.valueOf(wi.getIpAddress()).toByteArray();
    try {
        InetAddress myAddr = InetAddress.getByAddress(ipAddress);
        String hostAddr = myAddr.getHostAddress();
        return hostAddr;
    } catch (UnknownHostException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    return "";
}

结果：73.0.168.192

result : 73.0.168.192

推荐答案

好吧，我刚刚看到您的地址是相反的！ ：）

Ok, I just saw that your address is reversed! :)

它被称为大/小端的问题，阅读更多有关字节序这是必须 - 到知道所有的程序员，在不同操作系统上专门做应用整合和迁移的时候。

It is referred as big/little endian issue, read more about Endianness which is must-to-know for all programmers, specially when doing applications integrations and migrations on different Operating Systems.

流汗从WiFi管理器的连接信息后，添加这一点。

Add this after gettting the Connection Info from the Wifi manager.

int ipAddress = wi.getIpAddress();

ipAddress = (ByteOrder.nativeOrder().equals(ByteOrder.LITTLE_ENDIAN)) ? 
                Integer.reverseBytes(ipAddress) : ipAddress;

然后继续你的code。与toByteArray和getHostAddress等。

Then continue your code with toByteArray and getHostAddress etc.

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