Question

我在Linux控制台上运行服务器，用C语言编写并在android中创建客户端。我没有在DDMS上收到任何错误，但是发出调试消息后

11-12 20:38:06.787: DEBUG/SntpClient(60): request time failed: 
java.net.SocketException: Address family not supported by protocol

但邮件不会发送到服务器。但是如果在C或java中创建客户端它工作正常。任何建议。

public class UDPDemo extends Activity {
    private EditText mEditText;
    private Button sendButton;
    private DatagramSocket client_socket;
    private static InetAddress IPAddress;
    private byte[] send_data = new byte[1024];
    static{
    try {
     IPAddress =  InetAddress.getByName("127.0.0.1");
 } catch (UnknownHostException e1) {
 e1.printStackTrace();
 }
} 

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    mEditText = (EditText)findViewById(R.id.EditText01);
    sendButton = (Button)findViewById(R.id.Button01);
    sendButton.setOnTouchListener( send);
 }
OnTouchListener send = new OnTouchListener() {
  @Override
  public boolean onTouch(View v, MotionEvent event) {
  if( event.getAction() == MotionEvent.ACTION_UP)
  try {  
      client_socket = new DatagramSocket();
      String data =  mEditText.getText().toString();
      send_data = data.getBytes();

      DatagramPacket send_packet = new DatagramPacket(send_data,
               send_data.length, IPAddress, 5000); 

client_socket.send(send_packet);
mEditText.setText("");
  }catch (IOException e) {
    System.out.println("UDPDemo.enclosing_method() error"+e.getMessage());
   e.printStackTrace();
  }
 return true;
 }
};
}

Answer 1

SNTP是网络时间协议。模拟器尝试获取实际时间。我认为，这与您的应用程序无关。

来自：http://developer.appcelerator.com/question/117495/javanetsocketexception-address-family-not-supported-by-protocol

Answer 2

请记得添加

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

进入清单。

这对我有帮助。

Answer 3

我知道这已经过时但我相信这是你的问题：

IPAddress =  InetAddress.getByName("127.0.0.1");

Android使用127.0.0.1作为自己的环回设备。要获得“localhost”即服务器，您将需要10.0.2.2。

DEBUG / SntpClient（60）：请求时间失败：java.net.SocketException：协议不支持的地址族

3 个答案: