我有一个蓝牙设备，我想用我的智能手机连接，但这并不重要，它总会出现同样的错误：Java.IO.IOException: read failed, socket might closed or timeout, read ret: -1。
我已经在Stackoverflow上阅读了一些内容，但这些答案并不那么明确。是否有人有这方面的经验？
错误将显示在以下行：socket.Connect();
代码下方（我使用了Xamarin Android Connecting with bluetooth device的视频教程）。
BluetoothManager.cs
public class BluetoothManager
{
private const string profile = "00001101-0000-1000-8000-E4121DB64549";
private BluetoothDevice result;
private BluetoothSocket socket;
private BufferedReader reader;
private System.IO.Stream mStream;
private InputStreamReader mReader;
public BluetoothManager()
{
reader = null;
}
private UUID GetProfileUUID()
{
return UUID.FromString(profile);
}
private void Close(IDisposable connObject)
{
if (connObject == null) return;
try
{
connObject.Dispose();
} catch (Exception ex)
{
throw ex;
}
}
public String GetDataFromDevice()
{
return reader.ReadLine();
}
private void OpenDeviceConnection(BluetoothDevice bd)
{
try
{
socket = bd.CreateRfcommSocketToServiceRecord(GetProfileUUID());
socket.Connect();
mStream = socket.InputStream;
mReader = new InputStreamReader(mStream);
reader = new BufferedReader(mReader);
} catch (IOException ex)
{
Close(socket);
Close(mStream);
Close(mReader);
throw ex;
}
}
public void GetDevice()
{
BluetoothAdapter btAdapter = BluetoothAdapter.DefaultAdapter;
var devices = btAdapter.BondedDevices;
if(devices != null && devices.Count > 0)
{
foreach (BluetoothDevice bd in devices)
{
if(bd.Name == "CONTROLLER")
{
OpenDeviceConnection(bd);
}
}
}
}
}
InputModel.cs
public class InputModel
{
private string data = null;
public InputModel()
{
BluetoothManager bluetoothManager = new BluetoothManager();
bluetoothManager.GetDevice();
Thread thread = new Thread(() =>
{
while (true)
{
data = bluetoothManager.GetDataFromDevice();
}
});
thread.IsBackground = true;
thread.Start();
}
}
我希望有人可以帮我解决这个问题！
答案 0 :(得分：0)
请创建蓝牙服务器套接字
public class BluetoothService {
private static final String TAG = "Bluetooth Service";
// Name for the SDP record when creating server socket
private static final String NAME_SECURE = "Bluetooth Secure";
// Unique UUID for this application
private static final UUID UUID_ANDROID_DEVICE =
UUID.fromString("fa87c0d0-afac-11de-8a39-0800200c9a66");
private static final UUID UUID_OTHER_DEVICE =
UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
// Member fields
private final BluetoothAdapter mAdapter;
private final Handler mHandler;
private AcceptThread mSecureAcceptThread;
private ConnectThread mConnectThread;
private ConnectedThread mConnectedThread;
private int mState;
private boolean isAndroid = BluetoothState.DEVICE_ANDROID;
// Constructor. Prepares a new BluetoothChat session
// context : The UI Activity Context
// handler : A Handler to send messages back to the UI Activity
public BluetoothService(Context context, Handler handler) {
mAdapter = BluetoothAdapter.getDefaultAdapter();
mState = BluetoothState.STATE_NONE;
mHandler = handler;
}
// Set the current state of the chat connection
// state : An integer defining the current connection state
private synchronized void setState(int state) {
Log.d(TAG, "setState() " + mState + " -> " + state);
mState = state;
// Give the new state to the Handler so the UI Activity can update
mHandler.obtainMessage(BluetoothState.MESSAGE_STATE_CHANGE, state, -1).sendToTarget();
}
// Return the current connection state.
public synchronized int getState() {
return mState;
}
// Start the chat service. Specifically start AcceptThread to begin a
// session in listening (server) mode. Called by the Activity onResume()
public synchronized void start(boolean isAndroid) {
// Cancel any thread attempting to make a connection
if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}
setState(BluetoothState.STATE_LISTEN);
// Start the thread to listen on a BluetoothServerSocket
if (mSecureAcceptThread == null) {
mSecureAcceptThread = new AcceptThread(isAndroid);
mSecureAcceptThread.start();
BluetoothService.this.isAndroid = isAndroid;
}
}
// Start the ConnectThread to initiate a connection to a remote device
// device : The BluetoothDevice to connect
// secure : Socket Security type - Secure (true) , Insecure (false)
public synchronized void connect(BluetoothDevice device) {
// Cancel any thread attempting to make a connection
if (mState == BluetoothState.STATE_CONNECTING) {
if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}
}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}
// Start the thread to connect with the given device
mConnectThread = new ConnectThread(device);
mConnectThread.start();
setState(BluetoothState.STATE_CONNECTING);
}
/**
* Start the ConnectedThread to begin managing a Bluetooth connection
* @param socket The BluetoothSocket on which the connection was made
* @param device The BluetoothDevice that has been connected
*/
public synchronized void connected(BluetoothSocket socket, BluetoothDevice
device, final String socketType) {
// Cancel the thread that completed the connection
if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}
// Cancel the accept thread because we only want to connect to one device
if (mSecureAcceptThread != null) {
mSecureAcceptThread.cancel();
mSecureAcceptThread = null;
}
// Start the thread to manage the connection and perform transmissions
mConnectedThread = new ConnectedThread(socket, socketType);
mConnectedThread.start();
// Send the name of the connected device back to the UI Activity
Message msg = mHandler.obtainMessage(BluetoothState.MESSAGE_DEVICE_NAME);
Bundle bundle = new Bundle();
bundle.putString(BluetoothState.DEVICE_NAME, device.getName());
bundle.putString(BluetoothState.DEVICE_ADDRESS, device.getAddress());
msg.setData(bundle);
mHandler.sendMessage(msg);
setState(BluetoothState.STATE_CONNECTED);
}
// Stop all threads
public synchronized void stop() {
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
if (mSecureAcceptThread != null) {
mSecureAcceptThread.cancel();
mSecureAcceptThread.kill();
mSecureAcceptThread = null;
}
setState(BluetoothState.STATE_NONE);
}
// Write to the ConnectedThread in an unsynchronized manner
// out : The bytes to write
public void write(byte[] out) {
// Create temporary object
ConnectedThread r;
// Synchronize a copy of the ConnectedThread
synchronized (this) {
if (mState != BluetoothState.STATE_CONNECTED) return;
r = mConnectedThread;
}
// Perform the write unsynchronized
r.write(out);
}
// Indicate that the connection attempt failed and notify the UI Activity
private void connectionFailed() {
// Start the service over to restart listening mode
BluetoothService.this.start(BluetoothService.this.isAndroid);
}
// Indicate that the connection was lost and notify the UI Activity
private void connectionLost() {
// Start the service over to restart listening mode
BluetoothService.this.start(BluetoothService.this.isAndroid);
}
// This thread runs while listening for incoming connections. It behaves
// like a server-side client. It runs until a connection is accepted
// (or until cancelled)
private class AcceptThread extends Thread {
// The local server socket
private BluetoothServerSocket mmServerSocket;
private String mSocketType;
boolean isRunning = true;
public AcceptThread(boolean isAndroid) {
BluetoothServerSocket tmp = null;
// Create a new listening server socket
try {
if(isAndroid)
tmp = mAdapter.listenUsingRfcommWithServiceRecord(NAME_SECURE, UUID_ANDROID_DEVICE);
else
tmp = mAdapter.listenUsingRfcommWithServiceRecord(NAME_SECURE, UUID_OTHER_DEVICE);
} catch (IOException e) { }
mmServerSocket = tmp;
}
public void run() {
setName("AcceptThread" + mSocketType);
BluetoothSocket socket = null;
// Listen to the server socket if we're not connected
while (mState != BluetoothState.STATE_CONNECTED && isRunning) {
try {
// This is a blocking call and will only return on a
// successful connection or an exception
socket = mmServerSocket.accept();
} catch (IOException e) {
break;
}
// If a connection was accepted
if (socket != null) {
synchronized (BluetoothService.this) {
switch (mState) {
case BluetoothState.STATE_LISTEN:
case BluetoothState.STATE_CONNECTING:
// Situation normal. Start the connected thread.
connected(socket, socket.getRemoteDevice(),
mSocketType);
break;
case BluetoothState.STATE_NONE:
case BluetoothState.STATE_CONNECTED:
// Either not ready or already connected. Terminate new socket.
try {
socket.close();
} catch (IOException e) { }
break;
}
}
}
}
}
public void cancel() {
try {
mmServerSocket.close();
mmServerSocket = null;
} catch (IOException e) { }
}
public void kill() {
isRunning = false;
}
}
// This thread runs while attempting to make an outgoing connection
// with a device. It runs straight through
// the connection either succeeds or fails
private class ConnectThread extends Thread {
private final BluetoothSocket mmSocket;
private final BluetoothDevice mmDevice;
private String mSocketType;
public ConnectThread(BluetoothDevice device) {
mmDevice = device;
BluetoothSocket tmp = null;
// Get a BluetoothSocket for a connection with the
// given BluetoothDevice
try {
if(BluetoothService.this.isAndroid)
tmp = device.createRfcommSocketToServiceRecord(UUID_ANDROID_DEVICE);
else
tmp = device.createRfcommSocketToServiceRecord(UUID_OTHER_DEVICE);
} catch (IOException e) { }
mmSocket = tmp;
}
public void run() {
// Always cancel discovery because it will slow down a connection
mAdapter.cancelDiscovery();
// Make a connection to the BluetoothSocket
try {
// This is a blocking call and will only return on a
// successful connection or an exception
mmSocket.connect();
} catch (IOException e) {
// Close the socket
try {
mmSocket.close();
} catch (IOException e2) { }
connectionFailed();
return;
}
// Reset the ConnectThread because we're done
synchronized (BluetoothService.this) {
mConnectThread = null;
}
// Start the connected thread
connected(mmSocket, mmDevice, mSocketType);
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) { }
}
}
// This thread runs during a connection with a remote device.
// It handles all incoming and outgoing transmissions.
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket socket, String socketType) {
mmSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
// Get the BluetoothSocket input and output streams
try {
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) { }
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
byte[] buffer;
ArrayList<Integer> arr_byte = new ArrayList<Integer>();
// Keep listening to the InputStream while connected
while (true) {
try {
int data = mmInStream.read();
if(data == 0x0A) {
} else if(data == 0x0D) {
buffer = new byte[arr_byte.size()];
for(int i = 0 ; i < arr_byte.size() ; i++) {
buffer[i] = arr_byte.get(i).byteValue();
}
// Send the obtained bytes to the UI Activity
mHandler.obtainMessage(BluetoothState.MESSAGE_READ
, buffer.length, -1, buffer).sendToTarget();
arr_byte = new ArrayList<Integer>();
} else {
arr_byte.add(data);
}
} catch (IOException e) {
connectionLost();
// Start the service over to restart listening mode
BluetoothService.this.start(BluetoothService.this.isAndroid);
break;
}
}
}
// Write to the connected OutStream.
// @param buffer The bytes to write
public void write(byte[] buffer) {
try {/*
byte[] buffer2 = new byte[buffer.length + 2];
for(int i = 0 ; i < buffer.length ; i++)
buffer2[i] = buffer[i];
buffer2[buffer2.length - 2] = 0x0A;
buffer2[buffer2.length - 1] = 0x0D;*/
mmOutStream.write(buffer);
// Share the sent message back to the UI Activity
mHandler.obtainMessage(BluetoothState.MESSAGE_WRITE
, -1, -1, buffer).sendToTarget();
} catch (IOException e) { }
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) { }
}
}
}`
答案 1 :(得分：0)
我刚刚添加了GetUuids().ElementAt(0)来解决我的问题。见代码：
var listDevices = bluetoothAdapter.BondedDevices;
if (listDevices.Count > 0)
{
foreach (var btDevice in listDevices)
{
if (btDevice.Name == "CONTROLLER")
{
UUID = btDevice.GetUuids().ElementAt(0);
deviceDictionary.Add(btDevice.Name, btDevice.Address);
}
}
}
感谢您的帮助！
答案 2 :(得分：0)
问题解决了。我不需要蓝牙插座。我刚刚使用了覆盖方法＆＃34; KeyDown＆＃34;和＆＃34; KeyUp＆＃34;。现在效果很好:)）
如果你需要一个套接字并且你有IOException: read failed, socket might closed这样的例外，那么你应该在这里阅读我的修复：
IOException: read failed, socket might closed - Bluetooth on Android 4.3