java.io.IOException异常:服务发现失败 [英] java.io.IOException: Service discovery failed
问题描述
我在Android应用程序中使用两对智能手机之间的蓝牙连接工作。蓝牙逻辑是基于著名的BluetoothChat SDK例如:服务类管理服务器接受()线程
,客户端线程连接()
和读取/插座上写一个主题。
一切工作正常,但如果我关闭活动连接(无论是从客户端或服务器端),那么所有连续尝试启动一个新的连接将会失败,此错误:
java.io.IOException异常:服务发现失败
经过一番研究,我来想,这是UUID的问题。我使用的BTChat例子的UUID( fa87c0d0-AFAC-11de-8a39-0800200c9a66
),但问题仍然存在与另一个随机UUID(这是 31ef5990-dc20-11e2-a28f-0800200c9a66
)。
下面是相关客户logcat的。 (客户端连接()
是失败):
E / BluetoothService.cpp:stopDiscoveryNative:在StopDiscovery的D-Bus错误:org.bluez.Error.Failed(无效的搜索会话)
D / BluetoothService:清理失败UUID渠道查找:30:17:8:A7:C6:C3 fa87c0d0-AFAC-11de-8a39-0800200c9a66
java.io.IOException异常:服务发现失败
D型总线错误可能是由 cancelDiscovery()
是Android的文档显示前来调用connect()$ C $所致C>。我认为,
失败UUID渠道查找
是真正的问题,但我不知道如何解决这一问题。我应该使用其他(著名?)UUID?
如果需要的话,我可以告诉code片段。然而,这个问题很逻辑上类似于BluetoothChat。
方法M = device.getClass()。实现getMethod(createRfcommSocket,新的Class [] {} int.class );
TMP =(的BluetoothSocket)m.invoke(设备,1);
&安培;
M = mAdapter.getClass()实现getMethod(listenUsingRfcommOn,新的Class [] {} int.class)。
TMP =(BluetoothServerSocket)m.invoke(mAdapter,BLUETOOTH_CHANNEL);
嗯....我不是一个BT的专家,但我知道我的code。使用反射作品,未经UUID。我不认为这是一个很好的解决方案,如果你想要的东西干净,但我只知道,在我的情况,它的工作原理(在2.3.6):)
I'm working on an Android app using Bluetooth connectivity between two paired smartphones. The Bluetooth logic is based on the famous BluetoothChat SDK example: a "service" Class managing a thread for server accept()
, a thread for client connect()
and a thread for reading/writing on the socket.
Everything works fine, except if I close an active connection (both from client or server side), then all successive attempts to start a new connection will fail with this error:
java.io.IOException: Service discovery failed
After some research, I've come to think this is a problem with UUID. I'm using the UUID of the BTChat example (fa87c0d0-afac-11de-8a39-0800200c9a66
), but the problem remains with another random UUID (it was 31ef5990-dc20-11e2-a28f-0800200c9a66
).
Here is the relevant client logcat. (The client connect()
is what fails):
E/BluetoothService.cpp: stopDiscoveryNative: D-Bus error in StopDiscovery: org.bluez.Error.Failed (Invalid discovery session)
D/BluetoothService: Cleaning up failed UUID channel lookup: 30:17:C8:A7:C6:C3 fa87c0d0-afac-11de-8a39-0800200c9a66
java.io.IOException: Service discovery failed
The D-Bus error probably is caused by the cancelDiscovery()
that Android docs suggests to call before connect()
. I think that failed UUID channel lookup
is the real problem, but I have no idea how to fix this. Should I use another (well-known?) UUID?
If needed, I can show code snippets. Yet this problem is very logically similar to BluetoothChat.
Method m = device.getClass().getMethod("createRfcommSocket", new Class[] {int.class});
tmp = (BluetoothSocket) m.invoke(device, 1);
&
m = mAdapter.getClass().getMethod("listenUsingRfcommOn", new Class[] { int.class });
tmp = (BluetoothServerSocket) m.invoke(mAdapter, BLUETOOTH_CHANNEL);
Well .... I'm not a BT specialist, but I know that my code works without UUID using reflection. I don't think it's a good solution if you want something clean, but I just know that, in my case, it works (On 2.3.6) :)
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