安卓没有收到UDP包 [英] Android never receives UDP packet

问题描述

在超时下面code结果。

The below code results in a timeout.

它工作正常，在非Android的Java。发生什么事了？

It works fine on non-Android Java. What's the matter?

 //@Override
public static void run()
{
    //System.out.println ( "Local Machine IP : "+addrStr.toString (  )  ) ;
    HelloWorldActivity.tv.setText("Trace 1");

    try
    {
        // Retrieve the ServerName
        InetAddress serverAddr; //= InetAddress.getByName(Server.SERVERIP);
        InetAddress ias[] = InetAddress.getAllByName(Server.SERVERNAME);
        serverAddr  = ias[0];

        Log.d("UDP", "C: Connecting...");
        /* Create new UDP-Socket */
        DatagramSocket socket = new DatagramSocket();

        /* Prepare some data to be sent. */
        String strQuery="ÿÿÿÿgetservers"+" "+Server.iProtocol+" "+"'all'";
        Log.d("UDP", strQuery);
        //byte[] buf = ("ÿÿÿÿgetservers 68 'all'").getBytes();
        byte[] buf = strQuery.getBytes();

        /* Create UDP-packet with
         * data & destination(url+port) */
        DatagramPacket packet = new DatagramPacket(buf, buf.length,
                                                   serverAddr, Server.SERVERPORT);

        Log.d("UDP", "C: Sending: '" + new String(buf) + "'");

        /* Send out the packet */
        socket.setSoTimeout(5000);
        socket.send(packet);
        Log.d("UDP", "C: Sent.");
        Log.d("UDP", "C: Done.");

        // http://code.google.com/p/android/issues/detail?id=2917

        byte[] buffer= new byte[1024*100];
        DatagramPacket receivePacket
          = new DatagramPacket(buffer,
                               buffer.length); //, serverAddr, Server.SERVERPORT);
        socket.receive(receivePacket);
        HelloWorldActivity.tv.setText("TTT");

        String x = new String(receivePacket.getData());
        Log.d("UDP", "C: Received: '" + x  + "'");
        HelloWorldActivity.tv.setText(x);

   } catch (Exception e) {
       HelloWorldActivity.tv.setText(e.getMessage());
       Log.e("UDP", "C: Error", e);
   }
}


public class Server
{
    /*
    //public static java.lang.string SERVERIP;
    public static String SERVERNAME = "monster.idsoftware.com";
    public static String SERVERIP = "192.246.40.56";
    public static int SERVERPORT = 27950;
    public static int PROTOCOL = 68;
      */

    //public static String SERVERNAME="monster.idsoftware.com";
    public static String SERVERNAME="dpmaster.deathmask.net";

    public static String SERVERIP="192.246.40.56";
    public static int SERVERPORT=27950;
    //public static int iProtocol= 68; // Quake3
    public static int iProtocol=71; // OpenArena

}

Android清单：

Android manifest:

<?xml version="1.0" encoding="utf-8"?>

<use-permission id="android.permission.READ_CONTACTS" />

    <use-permission android:name="android.permission.WRITE_SETTINGS" />
    <uses-permission android:name="android.permission.READ_CONTACTS" />
    <uses-permission android:name="android.permission.CALL_PHONE" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_GPS" />
    <uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.ACCESS_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_ASSISTED_GPS" />
    <uses-permission android:name="android.permission.ACCESS_CELL_ID" />

    <uses-permission android:name="android.permission.RECEIVE_SMS" />
    <uses-permission android:name="android.permission.VIBRATE" />
    <uses-permission android:name="android.permission.WAKE_LOCK" />

<application
        android:icon="@drawable/icon"
        android:label="AAA New Application"
        >
    <activity android:name="HelloWorldActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN"/>
            <category android:name="android.intent.category.LAUNCHER"/>
        </intent-filter>
    </activity>
</application>

推荐答案

您在模拟器或在实际的手机测试呢？如果您使用的是模拟器，你需要知道如何在网络仿真器的工作原理。最具体：

Are you testing this on the emulator or on an actual phone? If you're using an emulator you need to be aware of how networking on the emulator works. Most specifically:

模拟器的每个实例运行背后的虚拟路由器/防火墙服务，从开发机器的网络接口和设置，并从互联网隔离开来。一个模拟装置不能在网络上看到您的开发机器或其他模拟器实例。相反，它只能看到，它是通过以太网连接到一个路由器/防火墙

Each instance of the emulator runs behind a virtual router/firewall service that isolates it from your development machine's network interfaces and settings and from the internet. An emulated device can not see your development machine or other emulator instances on the network. Instead, it sees only that it is connected through Ethernet to a router/firewall.

您可能会需要设置端口转发，无论是<一个href="http://developer.android.com/intl/fr/guide/developing/tools/emulator.html#portredirection">using使用亚洲开发银行<模拟器控制台或 / code>命令。

You'll probably need to set up port forwarding, either using the Emulator console or using the adb command.

这篇关于安卓没有收到UDP包的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！