能接收到udp数据,但是接收不到udp组播数据,请各位大神帮帮忙,万分感谢!
代码如下:
package ncepu.wsy.udp_multicast_server;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;
import java.sql.Date;
import java.text.SimpleDateFormat;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.net.wifi.WifiManager;
import android.net.wifi.WifiManager.MulticastLock;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.LinearLayout;
import android.widget.TextView;
@SuppressLint({ "SimpleDateFormat", "HandlerLeak" })
public class MulticastServer extends Activity {
private MulticastSocket ms;
private static String MulticastHost="238.9.9.1";
private static int PORT = 8302;
InetAddress receiveAddress;
String result = "";
private MulticastLock multicastLock;
LinearLayout layout;
String baotou="";
String mingling="";
String minglingleixing="";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
allowMulticast();
setContentView(R.layout.activity_main);
layout = (LinearLayout) findViewById(R.id.layout);
new Thread(){
public void run() {
try {
ms = new MulticastSocket(PORT);
receiveAddress=InetAddress.getByName(MulticastHost);
ms.joinGroup(receiveAddress);
} catch (Exception e) {
e.printStackTrace();
}
byte data[] = new byte[512];
DatagramPacket dp = new DatagramPacket(data, 512);
while (true) {
try {
ms.receive(dp);
result = new String(data, 0, dp.getLength());
Message msg = new Message();
msg.what = 1;
hd.sendMessage(msg);
} catch (Exception e) {
e.printStackTrace();
}
}
};
}.start();
}
Handler hd = new Handler(){
@SuppressWarnings("unused")
@Override
public void handleMessage(Message msg)
{
super.handleMessage(msg);
switch(msg.what){
case 1:
SimpleDateFormat formatter = new SimpleDateFormat ("yyyy年MM月dd日 HH:mm:ss");
Date curDate = new Date(System.currentTimeMillis());//获取当前时间
String str = formatter.format(curDate);
TextView tv =new TextView(MulticastServer.this);
tv.setText("result--》"+result);
layout.addView(tv);
break;
}
}
};
private void allowMulticast() {
WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
multicastLock = wifiManager.createMulticastLock("multicast.test");
multicastLock.acquire();
}
}
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<LinearLayout
android:id="@+id/layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
tools:context=".MainActivity" >
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
package="ncepu.wsy.udp_multicast_server"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="9"
android:targetSdkVersion="16" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="ncepu.wsy.udp_multicast_server.MulticastServer"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>