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Code is working fine for first time only, if i am trying to connect it again it is throwing this exception:
read failed, socket might closed or timeout, read ret: -1
This is my function for connecting to the bluetooth printer:
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;
}
解决方案
You should close your socket after using it :
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());
mmSocket.close(); //Socket closed
} catch (NullPointerException e) {
e.printStackTrace();
return false;
} catch (Exception e) {
e.printStackTrace();
return false;
}
return true;}
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