MulticastSocket的简单使用

来源：互联网发布：网络技术开发是什么编辑：程序博客网时间：2024/06/05 01:00

我们这里使用MulticastSocket以及组播锁的形式实时监控对应的ip和端口是否实时存在！

下面我们来看代码：

public Thread getListenThread(){Thread thread = null;try {thread = new Thread() {private static final String TAG = "ReceiverThread";private static final String MULTICAST_IP = "239.255.255.250";private static final int MULTICAST_PORT = 1900;private WifiManager wifiManager = (WifiManager)getSystemService(Context.WIFI_SERVICE);private MulticastSocket multicastSocket = new MulticastSocket(MULTICAST_PORT);private InetAddress groupInetAddress = InetAddress.getByName(MULTICAST_IP);private boolean joinedGroup = false;@Overridepublic void run() {while (!this.isInterrupted()) {if (wifiManager.getWifiState() == WifiManager.WIFI_STATE_ENABLED) {if (!joinedGroup)try {multicastSocket.joinGroup(groupInetAddress);wifiManager.createMulticastLock(TAG).acquire();joinedGroup = true;} catch (IOException ex) {Log.i(TAG, "Failed to join Multicast group:" + ex.getMessage());}try {byte[] buffer = new byte[1024];DatagramPacket packet = new DatagramPacket(buffer, buffer.length);while(true){multicastSocket.receive(packet);String text = new String(buffer, 0, packet.getLength());;//LogUtil.i(TAG, "Message received: /n" + text+"RECEIVED END");Message msg = new Message();msg.what = 4;Bundle bundle = new Bundle();bundle.putString("text", text);msg.setData(bundle);handlerdishes.sendMessageDelayed(msg,500);}} catch (SocketTimeoutException e) {e.printStackTrace();} catch (IOException ex) {multicastSocket = null;ex.printStackTrace();}  } elsejoinedGroup = false;}}};} catch (IOException e) {e.printStackTrace();}return thread;}

如上我们可知是使用线程的方式启动MulticastSocket，activity中启动的代码很简单：

/* * 监听盒子状态信息 */Thread boxListener_thread  = getListenThread();boxListener_thread.start();

同时使用handler处理相对应的事件，就OK了！

需要的权限有如下：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />    <uses-permission android:name="android.permission.RESTART_PACKAGES" />    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />    <uses-permission android:name="android.permission.GET_TASKS" />        <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />    <uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE" />    <uses-permission android:name="android.permission.INTERNET" />    <uses-permission android:name="android.permission.READ_PHONE_STATE" />    <uses-permission android:name="android.permission.WRITE_SETTINGS" />    <supports-screens        android:anyDensity="true"        android:largeScreens="true"        android:normalScreens="true"        android:resizeable="true"        android:smallScreens="true" />    <uses-permission android:name="android.permission.WAKE_LOCK" />    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />    <uses-permission android:name="android.permission.GET_TASKS" />    <uses-permission android:name="android.permission.READ_LOGS" />    <uses-permission android:name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION" />    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

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