从 ANDROID 2.2 发送 UDP 包(HTC 希望)
我有一个局域网,我想从我的 Android (htcdesire) 向我的电脑发送更新消息。它们之间有一个 WLAN 路由器。问题是,UPD 消息永远不会到达 PC。
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();
}
}
我选择展台两侧的高端口。
Android 上的权限是:
uses-permission android:name="android.permission.INTERNET"
uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE"
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();
}
}
}
那么为什么没有可见来自 android 的 UDP 包?即使 Wireshark 也只显示一些 ARP 包。 请帮忙:)
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.
Code on the Android.:
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.
The Permissions on the Android are:
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:
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 :)
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