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package com.example.multicastclient;

import android.support.v7.app.ActionBarActivity;

import java.io.IOException;

import java.net.DatagramPacket;

import java.net.InetAddress;

import java.net.MulticastSocket;

import java.net.UnknownHostException;

import android.content.Context;

import android.content.Intent;

import android.net.wifi.WifiManager;

import android.net.wifi.WifiManager.MulticastLock;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

public class ClientMainActivity extends ActionBarActivity {

private Button send;

private TextView printout1;

static String destAddressStr = "224.224.224.224";

static int destPortInt = 9998;

static int TTLTime = 4;

int destPort = destPortInt;

int TTL = TTLTime;

MulticastLock multicastLock;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

allowMulticast();

printout1=(TextView) findViewById(R.id.printout1);

findViewById(R.id.send).setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

// TODO Auto-generated method stub

try {

SendMulticastUdp();

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

});

multicastLock.release();

}

private void allowMulticast() {

// TODO Auto-generated method stub

WifiManager wifiManager=(WifiManager)getSystemService(Context.WIFI_SERVICE);

multicastLock=wifiManager.createMulticastLock("multicast.test");

multicastLock.acquire();

}

protected void SendMulticastUdp() throws Exception {

// TODO Auto-generated method stub

MulticastSocket multiSocket =new MulticastSocket(9998);

InetAddress destAddress =InetAddress.getByName(destAddressStr);

if(!destAddress.isMulticastAddress()){//檢測該地址是否是多播地址

printout1.setText("地址不是多播地址");

}

byte[] sendMSG = "#1029testmsg".getBytes();

DatagramPacket dp = new DatagramPacket(sendMSG, sendMSG.length, destAddress , destPort);

multiSocket.joinGroup(destAddress);

multiSocket.setTimeToLive(TTL);

multiSocket.send(dp);

//multiSocket.close();

}

}

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