带有DatagramChannel的java IndexOutOfBoundsException。接收（buf）；

Question

在网络编程方面，我是个十足的傻瓜

我得到以下错误：

E/AndroidRuntime( 4095): Caused by: java.lang.IndexOutOfBoundsException: length=18, offset=0, buffer size=0

在以下行：

SocketAddress servaddr = udpChannel.receive(rcvHskBuf);

这就是我创建缓冲区的方式

ByteBuffer rcvHskBuf = ByteBuffer.allocateDirect(packetSize);

为了调试，我将参数（可以在应用程序中更改）从默认值1432更改为1432*20，如下所述

我如何调试这个？我尝试将allocateDirect()参数更改为比以前大20倍，但仍然遇到这个问题

以下是完整的错误日志：

02-27 22:28:01.739: E/AndroidRuntime(2753): FATAL EXCEPTION: AsyncTask #1
02-27 22:28:01.739: E/AndroidRuntime(2753): java.lang.RuntimeException: An error occured while executing doInBackground()
02-27 22:28:01.739: E/AndroidRuntime(2753):     at 安卓.os.AsyncTask$3.done(AsyncTask.java:278)
02-27 22:28:01.739: E/AndroidRuntime(2753):     at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
02-27 22:28:01.739: E/AndroidRuntime(2753):     at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
02-27 22:28:01.739: E/AndroidRuntime(2753):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
02-27 22:28:01.739: E/AndroidRuntime(2753):     at java.util.concurrent.FutureTask.run(FutureTask.java:137)
02-27 22:28:01.739: E/AndroidRuntime(2753):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
02-27 22:28:01.739: E/AndroidRuntime(2753):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
02-27 22:28:01.739: E/AndroidRuntime(2753):     at java.lang.Thread.run(Thread.java:856)
02-27 22:28:01.739: E/AndroidRuntime(2753): Caused by: java.lang.IndexOutOfBoundsException: length=18, offset=0, buffer size=0
02-27 22:28:01.739: E/AndroidRuntime(2753):     at java.net.DatagramPacket.setLengthOnly(DatagramPacket.java:234)
02-27 22:28:01.739: E/AndroidRuntime(2753):     at java.net.DatagramPacket.setLength(DatagramPacket.java:222)
02-27 22:28:01.739: E/AndroidRuntime(2753):     at libcore.io.IoBridge.postRecvfrom(IoBridge.java:528)
02-27 22:28:01.739: E/AndroidRuntime(2753):     at libcore.io.IoBridge.recvfrom(IoBridge.java:516)
02-27 22:28:01.739: E/AndroidRuntime(2753):     at java.nio.DatagramChannelImpl.receiveDirectImpl(DatagramChannelImpl.java:232)
02-27 22:28:01.739: E/AndroidRuntime(2753):     at java.nio.DatagramChannelImpl.receive(DatagramChannelImpl.java:185)
02-27 22:28:01.739: E/AndroidRuntime(2753):     at com.alu.wireless.puredata.PSConnection.UDPInitialization(PSConnection.java:315)
02-27 22:28:01.739: E/AndroidRuntime(2753):     at com.alu.wireless.puredata.PSConnection.PSInitialization(PSConnection.java:73)
02-27 22:28:01.739: E/AndroidRuntime(2753):     at com.alu.wireless.puredata.PureDataActivity$MyTask.doInBackground(PureDataActivity.java:262)
02-27 22:28:01.739: E/AndroidRuntime(2753):     at com.alu.wireless.puredata.PureDataActivity$MyTask.doInBackground(PureDataActivity.java:1)
02-27 22:28:01.739: E/AndroidRuntime(2753):     at 安卓.os.AsyncTask$2.call(AsyncTask.java:264)
02-27 22:28:01.739: E/AndroidRuntime(2753):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
02-27 22:28:01.739: E/AndroidRuntime(2753):     ... 4 more

奇怪的是，应用程序可以很好地打印缓冲区的内容。显然，打印缓冲区内容的代码位于导致异常的行（上面写的第315行，我创建缓冲区的地方）之后

如有任何提示或指示，将不胜感激。提前谢谢