近期项目中连接蓝牙之后接收蓝牙设备发出的指令功能，在连接设备之后，创建RfcommSocket连接时候报java.io.IOException: read failed, socket might closed or timeout, read ret: -1错误。以下说一下我的解决方法，希望对各位有一点帮助。

private BluetoothSocket mSocket;	private InputStream mInputSream;	private UUID mUUID = UUID			.fromString("00001101-0000-1000-8000-00805F9B34FB");

//找到蓝牙设备并推断是否连接上蓝牙，并创建socket

BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();		Set
     
       sets = adapter.getBondedDevices();		Iterator
      
        iterator = sets.iterator();		while (iterator.hasNext()) {			BluetoothDevice device = iterator.next();			if (mUtils.isConnected(device))				try {					mBluetoothDevice = device;					mSocket = mBluetoothDevice							.createRfcommSocketToServiceRecord(mUUID);
      
     

接下来就是socket的连接了，本来我是在一个子线程中做的这些：

public void run() {						try {					if (mSocket != null)						mSocket.connect();					if (mSocket != null) {						mInputSream = mSocket.getInputStream();						mIsRunning = true;					}					while (mIsRunning) {						byte[] buffer = new byte[16];						while (mInputSream != null								&& mInputSream.read(buffer) > 0 && mIsRunning) {							String val = new String(buffer);							Log.i("SPP", val);							Intent intent = new Intent();							if (val.contains("+PTT=P")) {								intent.setAction("android.intent.action.PTT.down");							} else if (val.contains("+PTT=R")) {								intent.setAction("android.intent.action.PTT.up");							}							mContext.sendBroadcast(intent);							Arrays.fill(buffer, (byte) 0);						}					}				} catch (IOException e) {					try {						if (mInputSream != null)							mInputSream.close();						if (mSocket != null) {							mSocket.close();							mSocket = null;						}					} catch (Exception e2) {						// TODO: handle exception					}				}			}

可是这样在socket连接的时候还是会报java.io.IOException: read failed, socket might closed or timeout, read ret: -1错误，

查了各种资料也没找到解决方法。经过自己多次实验发如今

mSocket.connect()时候还须要在还有一个子线程中处理才正常连接上接收到指令。也就是例如以下代码：

public void run() {		new Thread(new Runnable() {			@Override			public void run() {				try {					if (mSocket != null)						mSocket.connect();					if (mSocket != null) {						mInputSream = mSocket.getInputStream();						mIsRunning = true;					}					while (mIsRunning) {						byte[] buffer = new byte[16];						while (mInputSream != null								&& mInputSream.read(buffer) > 0 && mIsRunning) {							String val = new String(buffer);							Log.i("SPP", val);							Intent intent = new Intent();							if (val.contains("+PTT=P")) {								intent.setAction("android.intent.action.PTT.down");							} else if (val.contains("+PTT=R")) {								intent.setAction("android.intent.action.PTT.up");							}							mContext.sendBroadcast(intent);							Arrays.fill(buffer, (byte) 0);						}					}				} catch (IOException e) {					try {						if (mInputSream != null)							mInputSream.close();						if (mSocket != null) {							mSocket.close();							mSocket = null;						}					} catch (Exception e2) {						// TODO: handle exception					}				}			}		}).start();	}

这里仅仅是找到了解决方法，可是还不知道原因，也查了各种资料，没有得到为什么在子线程中做，connect的时候还须要再开一个子线程。