Java read failed_android-获取java.io.IOException：读取失败,套接...

代码仅在第一次正常运行,如果我尝试再次连接它,则会引发此异常：

read failed, socket might closed or timeout, read ret: -1

这是我用于连接蓝牙打印机的功能：

public boolean openBT(Context context) throws IOException {

try {

// Standard SerialPortService ID

UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb");

mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);

mBluetoothAdapter.cancelDiscovery();

mmSocket.connect();

mmOutputStream = new DataOutputStream(mmSocket.getOutputStream());

mmInputStream = new DataInputStream(mmSocket.getInputStream());

} catch (NullPointerException e) {

e.printStackTrace();

return false;

} catch (Exception e) {

e.printStackTrace();

return false;

}

return true;

}