首先,我知道有一個幾乎相同的問題here,但它沒有回答。所以我再問一次。DatagramChannel.receive()導致IndexOutOfBoundsException
在我的Android應用程序中,我使用非阻塞UDP套接字來做一些廣播作業,所以我選擇DatagramChannel
。當我在Samsung GT-P7510(使用Android 4.0.4)上運行以下代碼時,我得到一個IndexOutOfBoundsException
,它表示緩衝區不夠長。但顯然我已經分配了足夠大的空間。有誰知道原因?任何幫助表示讚賞。
代碼導致異常:
ByteBuffer bytebuf = ByteBuffer.allocateDirect(1024);
bytebuf.clear();
try {
// LINE causes the Exception!
SocketAddress addr = socketDiscoverChannel.receive(bytebuf);
if (addr != null) {
bytebuf.flip();
InetSocketAddress remoteAddr = (InetSocketAddress) addr;
String remoteIP = remoteAddr.getAddress().getHostAddress();
......
......
} finally {
......
}
登錄:
02-26 16:58:22.209: E/AndroidRuntime(4695): FATAL EXCEPTION: IntentService[DaemonListeningService]
02-26 16:58:22.209: E/AndroidRuntime(4695): java.lang.IndexOutOfBoundsException: length=36, offset=0, buffer size=0
02-26 16:58:22.209: E/AndroidRuntime(4695): at java.net.DatagramPacket.setLengthOnly(DatagramPacket.java:234)
02-26 16:58:22.209: E/AndroidRuntime(4695): at java.net.DatagramPacket.setLength(DatagramPacket.java:222)
02-26 16:58:22.209: E/AndroidRuntime(4695): at libcore.io.IoBridge.postRecvfrom(IoBridge.java:528)
02-26 16:58:22.209: E/AndroidRuntime(4695): at libcore.io.IoBridge.recvfrom(IoBridge.java:516)
02-26 16:58:22.209: E/AndroidRuntime(4695): at java.nio.DatagramChannelImpl.receiveDirectImpl(DatagramChannelImpl. java:232)
02-26 16:58:22.209: E/AndroidRuntime(4695): at java.nio.DatagramChannelImpl.receive(DatagramChannelImpl.java:185)
02-26 16:58:22.209: E/AndroidRuntime(4695): at com.zisync.daemon.DaemonListeningService.startListening( DaemonListeningService.java:261)
02-26 16:58:22.209: E/AndroidRuntime(4695): at com.zisync.daemon.DaemonListeningService.onHandleIntent( DaemonListeningService.java:98)
02-26 16:58:22.209: E/AndroidRuntime(4695): at android.app.IntentService$ServiceHandler.handleMessage(IntentService. java:65)
02-26 16:58:22.209: E/AndroidRuntime(4695): at android.os.Handler.dispatchMessage(Handler.java:99)
02-26 16:58:22.209: E/AndroidRuntime(4695): at android.os.Looper.loop(Looper.java:137)
02-26 16:58:22.209: E/AndroidRuntime(4695): at android.os.HandlerThread.run(HandlerThread.java:60)
'.flip()'是在發生異常之後,實際上它不會被執行一次......順便說一句,.flip()就是我想要的。 –
看起來像Android中的一個重大錯誤對我來說。 – EJP
@EJP似乎是這樣!我只是發佈一個答案,但不知道它是否正確。 –