android 怎么获取ip地址

在 Android 中获取 IP 地址有几种常见的方式:

1. 使用 `WifiManager` 类:

```java

WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(WIFI_SERVICE);

WifiInfo wifiInfo = wifiManager.getConnectionInfo();

int ipAddress = wifiInfo.getIpAddress();

String ipString = ((ipAddress & 0xFF) + "." +

(ipAddress >> 8 & 0xFF) + "." +

(ipAddress >> 16 & 0xFF) + "." +

(ipAddress >> 24 & 0xFF));

```

2. 使用 `ConnectivityManager` 类:

```java

ConnectivityManager connMgr = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();

if (networkInfo != null && networkInfo.isConnected()) {

InetAddress inetAddress = networkInfo.getDetailedState().getInetAddress();

String ipString = inetAddress.getHostAddress();

}

```

3. 使用 `InetAddress` 类:

```java

try {

for (Enumeration en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {

NetworkInterface intf = en.nextElement();

for (Enumeration enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {

InetAddress inetAddress = enumIpAddr.nextElement();

if (!inetAddress.isLoopbackAddress()) {

String ipString = inetAddress.getHostAddress();

}

}

}

} catch (SocketException ex) {

ex.printStackTrace();

}

```

需要注意的是,Android 8.0 (API 26) 以上版本需要申请 `android.permission.ACCESS_NETWORK_STATE` 权限才能使用 `ConnectivityManager` 和 `InetAddress` 类获取 IP 地址。