Unable to receive data from a device even when it is paired , Getting IO Exception error . I have built a android app to receive data from a device, for the first time I am getting all the values but if I try for second time the data is not receiving, I have to remove it from paired list and have to pair it again, in android studio I am getting IOException error and "getBluetoothService called with no BluetoothManagerCallback".
In some devices its working fine.
logcat screenshot
@Override
protected void onResume() {
super.onResume();
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter != null) {
if (!mBluetoothAdapter.isEnabled())
{
Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
} else {
scanAndPairDevice();
}
} else {
// TODO Android Device doesnt Support Bluetooth
}
}
private void scanAndPairDevice() {
if (isDevicePaired()) {
receiveDataFromDevice();
} else {
if(flag!=1) {
showAlertDialog(mContext, "SPLTECH Device is not paired!", "Please pair the device to connect", 1);
}
else {
showAlertDialog(mContext, "SPLTECH Device is not registered!", "Please conect with a registered device", 3);
}
//getDeviceListFromServer();
}
}
private boolean isDevicePaired() {
Set<BluetoothDevice> bluetoothDeviceSet = mBluetoothAdapter.getBondedDevices();
if (bluetoothDeviceSet.size() > 0) {
Set<String> set=mSesssion.getDeviceList();
Iterator<BluetoothDevice> iT=bluetoothDeviceSet.iterator();
while(iT.hasNext()){
BluetoothDevice device=iT.next();
for(String device1: set)
{
if(device.getName().equals("SPLTECH"))
{
flag=1;
}
if(device.getAddress().equals(device1))
{
mDevice = device;
mSesssion.setDeviceMacId(device.getAddress());
return true;
}
}
}
}
return false;
}
private void receiveDataFromDevice() {
mProgressBar.setVisibility(View.GONE);
mHint.setVisibility(View.VISIBLE);
Toast.makeText(mContext, "Now,Bluetooth is Ready to Take Value From Device..!", Toast.LENGTH_SHORT).show();
myThreadConnectBTdevice = new ThreadConnectBTdevice();
myThreadConnectBTdevice.start();
}
private class ThreadConnectBTdevice extends Thread {
private BluetoothSocket bluetoothSocket = null;
private ThreadConnectBTdevice() {
try {
Log.i("hii","hello");
//bluetoothSocket = mDevice.createRfcommSocketToServiceRecord(myUUID);
Method m = mDevice.getClass().getMethod("createRfcommSocket", new Class[] { int.class });
bluetoothSocket = (BluetoothSocket) m.invoke(mDevice, 1);
} catch (Exception e) {
// TODO Auto-generated catch block
Log.i("hii","hello");
e.printStackTrace();
}
}
@Override
public void run() {
boolean success = false;
try {
bluetoothSocket.connect();
success = true;
} catch (IOException e)
{
e.printStackTrace();
final String eMessage = e.getMessage();
runOnUiThread(new Runnable() {
@Override
public void run() {
// textStatus.setText("something wrong bluetoothSocket.connect(): \n" + eMessage);
}
});
try{
bluetoothSocket.close();
}
catch (IOException ex)
{
}
}
if (success) {
//connect successful
startThreadConnected(bluetoothSocket);
} else {
//fail
Log.i("hii","in false");
}
}
public void cancel() {
try {
bluetoothSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
private void startThreadConnected(BluetoothSocket socket) {
myThreadConnected = new ThreadConnected(socket);
myThreadConnected.start();
}
/*
ThreadConnected:
Background Thread to handle Bluetooth data communication
after connected
*/
private class ThreadConnected extends Thread {
private final BluetoothSocket connectedBluetoothSocket;
private final InputStream connectedInputStream;
private final OutputStream connectedOutputStream;
public ThreadConnected(BluetoothSocket socket) {
connectedBluetoothSocket = socket;
InputStream in = null;
OutputStream out = null;
try {
in = socket.getInputStream();
out = socket.getOutputStream();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
connectedInputStream = in;
connectedOutputStream = out;
}
@Override
public void run() {
byte[] buffer = new byte[1024];
int bytes;
while (true) {
try {
bytes = connectedInputStream.read(buffer);
final String strReceived = new String(buffer, 0, bytes);
Log.d("abc", strReceived);
Message readMsg = mHandler.obtainMessage(
DATA_FROM_DEVICE, strReceived);
readMsg.sendToTarget();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
final String msgConnectionLost = "Connection lost:\n"
+ e.getMessage();
runOnUiThread(new Runnable() {
@Override
public void run() {
mHint.setText(msgConnectionLost);
}
});
break;
}
}
}
public void write(byte[] buffer) {
try {
connectedOutputStream.write(buffer);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void cancel() {
try {
connectedBluetoothSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
