我的android设备已连接到我的家庭无线网络。还有一个特殊的UDP设备连接到它。我的android应用成功可以发送命令给UDP设备。但是,如果我打开一个套接字它不会收到数据。你能看到什么是错的吗?我知道从iphone-APP的UDP-设备中的哪一个工作无法通过UDP从设备(在WLAN中)通过套接字接收数据
下面是如何应用程序发送指令的IP:
public static final String SERVERIP = "192.168.2.114";
public static final int PORT = 44444;
public void run() {
try {
serverAddr = InetAddress.getByName(SERVERIP);
DatagramSocket socket = new DatagramSocket();
byte[] buf = message.toByteArray();
DatagramPacket packet = new DatagramPacket(buf, buf.length, serverAddr, PORT);
socket.send(packet);
socket.close();
} catch (Exception e) {
Log.e("UDP", "Sender/Client: Error", e);
}
}
虽然我有用于接收数据的两种方法:
public static final String SERVERIP = "192.168.2.114";
public static final int SERVERPORT = 44445;
private InetAddress serverAddr;
public void run() {
try {
InetAddress serverAddr = InetAddress.getByName(SERVERIP);
DatagramSocket socket = new DatagramSocket(SERVERPORT, serverAddr);
byte[] buf = new byte[65213];
DatagramPacket packet = new DatagramPacket(buf, buf.length);
socket.receive(packet);
} catch (Exception e) {
Log.e("UDP", "Receiver: Error", e);
}
try {
serverAddr = InetAddress.getByName(SERVERIP);
DatagramChannel channel = DatagramChannel.open();
DatagramSocket socket = channel.socket();
byte[] buf = new byte[65213];
DatagramPacket packet = new DatagramPacket(buf, buf.length, serverAddr, SERVERPORT);
socket.receive(packet);
socket.close();
} catch (Exception e) {
Log.e("UDP", "Sender/Client: Error", e);
}
}
在第一个try块的方法导致的异常:
java.net.BindException: Cannot assign requested address
at org.apache.harmony.luni.platform.OSNetworkSystem.bind(Native Method)
at dalvik.system.BlockGuard$WrappedNetworkSystem.bind(BlockGuard.java:268)
at org.apache.harmony.luni.net.PlainDatagramSocketImpl.bind(PlainDatagramSocketImpl.java:81)
at java.net.DatagramSocket.createSocket(DatagramSocket.java:193)
at java.net.DatagramSocket.<init>(DatagramSocket.java:95)
at de.myappname.connection.Receiver.run(Receiver.java:29)
at java.lang.Thread.run(Thread.java:1019)
第二AP proach只是通过不接收数据的socket.receive(packet)阻塞线程。从iPhone和规格我知道该设备通过无线局域网上的UDP 44445发送数据。任何建议有什么不对? 谢谢!
终于在这里找到了解决方案:http://code.google.com/p/boxeeremote/wiki/AndroidUDP – softwaresupply