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

標籤：android   bluetooth   bluetoothsocket   

最近項目中串連藍芽之後接收藍牙裝置發出的指令功能，在串連裝置之後，建立RfcommSocket串連時候報java.io.IOException: read failed, socket might closed or timeout, read ret: -1錯誤，下面說一下我的解決方案，希望對各位有一點協助。

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");

//找到藍牙裝置並判斷是否串連上藍芽，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的串連了，本來我是在一個子線程中做的這些：

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串連的時候還是會報java.io.IOException: read failed, socket might closed or timeout, read ret: -1錯誤，

查了各種資料也沒找到解決方案，<span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);">經過自己多次實驗發現在</span>

mSocket.connect()時候還需要在另一個子線程中處理才正常串連上接收到指令，也就是如下代碼：

<pre name="code" class="java">public void run() {new Thread(new Runnable() {@Overridepublic 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();}

這裡只是找到瞭解決方法，但是還不知道原因，也查了各種資料，沒有得到為什麼在子線程中做，connect的時候還需要再開一個子線程。

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