java 从 ANDROID 2.2 发送 UDP 包（HTC 的愿望）
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Sending UDP packages from ANDROID 2.2 (HTC desire)
提问by user623273
i have a lan and i want to send a upd message from my android (htc desire) to my PC. Theres a Wlan Router between them. The Problem is, that the UPD message never gets to the PC.
我有一个局域网，我想从我的 android（htc 愿望）向我的 PC 发送一条更新消息。它们之间有一个 Wlan 路由器。问题是，UPD 消息永远不会到达 PC。
Code on the Android.:
Android上的代码。：
package org.example.androidapp;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
public class UDPClientAnd {
public void sendUDPMessage(int port) throws java.io.IOException {
DatagramSocket socket = new DatagramSocket();
InetAddress serverIP = InetAddress.getByName("192.168.1.110");
byte[] outData = ("Ping").getBytes();
DatagramPacket out = new DatagramPacket(outData,outData.length, serverIP,50005);
socket.send(out);
socket.close();
}
}
I choose a high port on booth sides.
我选择展位两侧的高端口。
The Permissions on the Android are:
Android上的权限是：
uses-permission android:name="android.permission.INTERNET"
uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE"
The Server-Side is the PC just a simple programm for receiving:
服务器端是 PC 只是一个简单的接收程序：
package org.example.androidapp;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
public class UPDServerAnd implements Runnable{
public void run(){
byte[] inData = new byte[48];
byte[] outData = new byte[48];
String message;
DatagramSocket socket;
try {
socket = new DatagramSocket(50005);
while (true) {
DatagramPacket in = new DatagramPacket(inData,inData.length);
socket.receive(in);
InetAddress senderIP = in.getAddress();
int senderPort = in.getPort();
message=new String(in.getData(),0,in.getLength());
System.out.println("Got "+message+" from "+senderIP+","+senderPort);
outData = "Pong".getBytes();
DatagramPacket out = new DatagramPacket(outData,outData.length, senderIP,senderPort);
socket.send(out);
}
} catch (SocketException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
So why is there no UDP Package visible coming from android? Even Wireshark only shows some ARP packages. Plz help :)
那么为什么没有来自 android 的 UDP 包可见呢？甚至 Wireshark 也只显示一些 ARP 包。请帮忙:)
回答by Alex
I was having a very similar problem. My solution was to add:
我遇到了非常相似的问题。我的解决方案是添加：
uses-permission android:name="android.permission.INTERNET"
uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"
uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE"
to the Manifest.xmlfile. Then I disabled all Windows firewalland it worked. I was able to send a Stringfrom my Droidto a PC.
到Manifest.xml文件。然后我禁用了所有Windows firewall并且它起作用了。我能够String从我Droid的电脑发送一个。
