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

近期項目中鏈接藍牙以後接收藍牙設備發出的指令功能，在鏈接設備以後，建立RfcommSocket鏈接時候報java.io.IOException: read failed, socket might closed or timeout, read ret: -1錯誤。如下說一下個人解決方法，但願對各位有一點幫助。

private BluetoothSocket mSocket;
<span style="white-space:pre">	</span>private InputStream mInputSream;
<span style="white-space:pre">	</span>private UUID mUUID = UUID
<span style="white-space:pre">			</span>.fromString("00001101-0000-1000-8000-00805F9B34FB");

//找到藍牙設備並推斷是否鏈接上藍牙，並建立socket

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

接下來就是socket的鏈接了，原本我是在一個子線程中作的這些：

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
					}
				}
		
	}

但是這樣在socket鏈接的時候仍是會報java.io.IOException: read failed, socket might closed or timeout, read ret: -1錯誤，

查了各類資料也沒找到解決方法。<span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);">通過本身屢次實驗發現在</span>

mSocket.connect()時候還需要在還有一個子線程中處理才正常鏈接上接收到指令。也就是例如如下代碼：

<pre name="code" class="java">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();
	}

這裏僅僅是找到了解決方法，但是還不知道緣由，也查了各類資料，沒有獲得爲何在子線程中作，connect的時候還需要再開一個子線程。