java.io.IOException: read failed, socket might closed or timeout, read ret: -1

最近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，下面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");

//找到蓝牙设备并判断是否连接上蓝牙，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
					}
				}
		
	}

但是这样在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现在

mSocket.connect()时候还需要在另一个子线程中处理才正常连接上接收到指令，也就是如下代码：

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();
	}
 
  
 这里只是找到了解决方法，但是还不知道原因，也查了各种资料，没有得到为什么在子线程中做，connect的时候还需要再开一个子线程。