java.net.BindException: bind failed: EADDRINUSE (Address already in use)

E/NMPWIFI ( 1189): java.net.BindException: bind failed: EADDRINUSE (Address already in use)

W/System.err( 1189): java.net.BindException: bind failed: EADDRINUSE (Address already in use)

W/System.err( 1189): at libcore.io.IoBridge.bind(IoBridge.java:89)

W/System.err( 1189): at java.net.PlainDatagramSocketImpl.bind(PlainDatagramSocketImpl.java:68)

W/System.err( 1189): at java.net.DatagramSocket.createSocket(DatagramSocket.java:133)

W/System.err( 1189): at java.net.DatagramSocket.<init>(DatagramSocket.java:78)

W/System.err( 1189): at com.nmp.nmpdmc.NMPWIFI$ReceiveUdp.run(NMPWIFI.java:276)

W/System.err( 1189): Caused by: libcore.io.ErrnoException: bind failed: EADDRINUSE (Address already in use)

W/System.err( 1189): at libcore.io.Posix.bind(Native Method)

W/System.err( 1189): at libcore.io.ForwardingOs.bind(ForwardingOs.java:39)

W/System.err( 1189): at libcore.io.IoBridge.bind(IoBridge.java:87)

W/System.err( 1189): ... 4 more
解决方法：

将：udpSocket = new DatagramSocket(DEFAULT_PORT );

改为：

if(udpSocket==null){

udpSocket = new DatagramSocket(null);

udpSocket.setReuseAddress(true);

udpSocket.bind(new InetSocketAddress(DEFAULT_PORT));

}