我希望将套接字绑定到本地wifi网络地址,以确保请求不通过3g或其他网络运行。 我尝试了这段代码:
public static String getIpAddress(WifiManager wifiManager) {
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
int ipAddress = wifiInfo.getIpAddress();
return String.format("%d.%d.%d.%d", (ipAddress & 0xff),(ipAddress >> 8 & 0xff),
(ipAddress >> 16 & 0xff),(ipAddress >> 24 & 0xff));
}
Socket socket = new Socket();
String localIpAddress = getIpAddress(wifiManager);
socket.bind(new InetSocketAddress(localIpAddress, 80));
socket.connect(new InetSocketAddress(serverHostname, serverPort), (int) timeoutMs);
它报错了:
java.net.BindException: bind failed: EACCES (Permission denied)
我查看了清单文件中的权限,似乎已经授予了所有需要的权限:
<!-- Uses: show 'disconnected' message when not connected to the internet -->
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<!-- Uses: record wifi network name when setting up a device -->
<!-- Uses: device wifi setup -->
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<!-- Uses: device wifi setup -->
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.INTERNET" />