java.io.IOException：bt socket不在listen状态[Android Marshmallow]
[英]java.io.IOException: bt socket is not in listen state [Android Marshmallow]
问题描述
I am trying to establish a connection between nexus 5(Android 6+) and Google Glass. 
我正在尝试在nexus 5（Android 6+）和Google Glass之间建立连接。 Client side code to connect: 要连接的客户端代码：
try {
bluetoothSocket = device.createInsecureRfcommSocketToServiceRecord(
BluetoothParametersHolder.uuids[0]);
} catch (Exception e) {
e.printStackTrace();
}
//In a thread
bluetoothSocket.connect();
Server side code: 服务器端代码：
mmServerSocket = bluetoothAdapter.listenUsingInsecureRfcommWithServiceRecord(
BluetoothParametersHolder.NAME, BluetoothParametersHolder.uuids[0]);
//In a thread
socket = mmServerSocket.accept();
Using https://github.com/vicmns/BluetoothGlass as a reference. 使用https://github.com/vicmns/BluetoothGlass作为参考。 The problem I'm facing is that immediately after the accept() returns, connection gets disconnect with the following error: 我面临的问题是，在accept（）返回后，连接会立即与以下错误断开连接：
02-15 16:20:42.769 2163-2414/?
I am new to Bluetooth and Glass. 我是蓝牙和玻璃的新手。 Any help is really appreciated. 任何帮助都非常感谢。 Didn't get much help from the existing posts. 没有得到现有帖子的帮助。 All I'm trying here is to send a 'hello' message from client(Glass) to server(Mobile). 我在这里尝试的是从客户端（Glass）向服务器（Mobile）发送“hello”消息。
1 个解决方案
解决方案1
0 2019-01-04 10:36:46
Looking inside the framework code, we can find following: 查看框架代码，我们可以找到以下内容：
if (mSocketState != SocketState.LISTENING)
throw new IOException("bt socket is not in listen state");
Clearly the method accept() throws exception if the socket is not in the state LISTENING . 显然，如果套接字不处于LISTENING状态，方法accept()会抛出异常。
In most of the cases this happens if the instance of BluetoothServerSocket is already closed . 在大多数情况下，如果BluetoothServerSocket的实例已经关闭 ，则会发生这种情况。 Make sure the BluetoothServerSocket is not closed before trying to accept connections. 在尝试接受连接之前，请确保BluetoothServerSocket未关闭。
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