[英]Communicate Android Application to PC Application over Wifi
我正在制作一個Android應用程序,它將通過Wifi發送UDP廣播。 並且有一個PC程序可以接收它。 這是代碼:
這是AndroidManifest.xml
的用戶權限
<uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE" />
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
DeviceManagerWindow.java
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.view.Menu;
public class DeviceManagerWindow extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_device_manager_window);
WifiManager wifi = (WifiManager)getSystemService( Context.WIFI_SERVICE );
if(wifi != null)
{
WifiManager.MulticastLock lock = wifi.createMulticastLock("WifiDevices");
lock.acquire();
}
Thread sendMulticast = new Thread(new MultiCastThread());
sendMulticast.start();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.device_manager_window, menu);
return true;
}
}
該文件發送多播數據包:
MultiCastThread.java
public class MultiCastThread implements Runnable
{
MulticastSocket s;
DatagramPacket pack;
public MultiCastThread()
{
try
{
s = new MulticastSocket(WifiConstants.PORT_NO);
s.joinGroup(InetAddress.getByName(WifiConstants.GROUP_ADDR));
}
catch(Exception e)
{
Log.v("Socket Error: ",e.getMessage());
}
}
@Override
public void run()
{
try
{
pack = new DatagramPacket(WifiConstants.WHO_IS.getBytes(),WifiConstants.WHO_IS.getBytes().length, InetAddress.getByName(WifiConstants.GROUP_ADDR), WifiConstants.PORT_NO);
s.setTimeToLive(WifiConstants.TIME_TO_LIVE);
s.send(pack);
}
catch(Exception e)
{
Log.v("Packet Sending Error: ",e.getMessage());
}
}
}
WifiConstants.java
此文件保留Wifi互動常數的記錄。
public class WifiConstants
{
public static final int PORT_NO = 5432;
public static final String GROUP_ADDR = "225.4.5.6";
public static final int DGRAM_LEN = 1024;
public static final String WHO_IS = "Who is?";
public static final int TIME_TO_LIVE = 100;
}
在我的系統上,我正在運行一個Java代碼來接收數據包並在控制台中將其打印出來。
ListenerDevice.java
package Receiver;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;
public class ListenerDevice
{
public static final int PORT_NO = 5432;
public static final String GROUP_ADDR = "225.4.5.6";
public static final int DGRAM_LEN = 1024;
public static final String WHO_IS = "Who is?";
public static final int TIME_TO_LIVE = 1;
public static void main(String[] args)
{
MulticastSocket socket = null;
DatagramPacket inPacket = null;
byte[] inBuf = new byte[DGRAM_LEN];
try
{
//Prepare to join multicast group
socket = new MulticastSocket(PORT_NO);
InetAddress address = InetAddress.getByName(GROUP_ADDR);
socket.joinGroup(address);
while(true)
{
System.out.println("Listening");
inPacket = new DatagramPacket(inBuf, inBuf.length);
socket.receive(inPacket);
String msg = new String(inBuf, 0, inPacket.getLength());
System.out.println("From :" + inPacket.getAddress() + " Msg : " + msg);
}
}
catch(Exception ioe)
{
System.out.println(ioe);
}
}
}
這正在發送數據,但不在PC端接收。 兩個設備都連接到同一網絡。
我還創建了一個用於在移動設備上接收數據包的類。 它正在接收正在發送的數據包。
我應該怎么做才能連接它。
兩個設備應連接到同一網絡 。 當您將數據包從仿真器發送到PC時,它位於同一系統上。 因此,您不會遇到任何問題。 但是,當您將數據包從PC發送到移動設備時,兩個設備應共享同一網絡。
如果兩個設備都連接到非unfirewalled
網絡,則效率會更高。 因為防火牆可能會在發送數據包時造成麻煩。
這是我得出的結論。
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