I am working on the project on the android dev. the website for BluetoothChat and it seems to be sending messages correctly but not receiving them. In the past, I attempted to create another Bluetooth app and when connecting to a device I was prompted to confirm the connection and presented with a pin code. when working on the current app I am never given a prompt. However, it is not hitting any exceptions and messages seem to be sending. Here is my Thread class for managing a connection:
inner class ConnectedThread(val socket:BluetoothSocket, val socketType:String) : Thread(){
val inStream = socket.inputStream
val outStream = socket.outputStream
init {
mState = STATE_CONNECTED
}
override fun run() {
Log.i(TAG, "BEGIN mConnectedThread")
val buffer = ByteArray(1024)
var bytes:Int
while (mState == STATE_CONNECTED){
try {
bytes = inStream.read(buffer)
mHandler.obtainMessage(Constants.MESSAGE_READ, bytes, -1, buffer)
.sendToTarget()
}catch (ioe:IOException){
Log.e(TAG, "disconnected", ioe)
connectionLost()
break
}
}
}
fun write(buffer:ByteArray){
try {
outStream.writeMessage(buffer, mHandler)
}catch (ioe:IOException){
Log.e(TAG, "Exception during write", ioe)
}
}
fun cancel(){
try {
socket.close()
}catch (ioe:IOException){
Log.e(TAG, "close of connect socket failed", ioe)
}
}
}
}
and below i it the extension function used to write to the OutputStream:
fun OutputStream.writeMessage(buffer:ByteArray, handler:Handler? = null){
write(buffer)
handler?.let {
it.obtainMessage(Constants.MESSAGE_WRITE, -1, -1, buffer)
.sendToTarget()
}
}
I just am not sure where my mistake is. I was thinking it was a problem with the way that I am sending the message? But when I step through my code with the debugger I really don't see anything out of place. Now I am thinking that the problem is at the end of the receiving device which doesn't seem to receive anything at all. I will post my Handler and broadcastReceiver as well:
val mHandler = object:Handler(){
override fun handleMessage(msg: Message?) {
when(msg!!.what) {
Constants.MESSAGE_STATE_CHANGE -> {
when(msg.arg1) {
BluetoothChatService.STATE_CONNECTED -> {
setStatus(getString(R.string.title_connected_to, mConnectedDeviceName))
mConversationArrayAdapter!!.clear()
}
BluetoothChatService.STATE_CONNECTING -> {
setStatus(getString(R.string.title_connecting))
}
BluetoothChatService.STATE_LISTEN -> {
}
BluetoothChatService.STATE_NONE -> {
setStatus(getString(R.string.title_not_connected))
}
}
}
Constants.MESSAGE_WRITE -> {
val writeBuf = msg.obj as ByteArray
val writeMessage = String(writeBuf)
mConversationArrayAdapter!!.add("Me: $writeMessage")
}
Constants.MESSAGE_READ -> {
val readBuf = msg.obj as ByteArray
val readMessage = String(readBuf, 0, msg.arg1)
mConversationArrayAdapter!!.add("$mConnectedDeviceName: $readMessage")
}
Constants.MESSAGE_DEVICE_NAME -> {
mConnectedDeviceName = msg.data.getString(Constants.DEVICE_NAME)
if (activity!=null)Toast.makeText(activity, "Connected to $mConnectedDeviceName", Toast.LENGTH_SHORT).show()
}
Constants.MESSAGE_TOAST -> {
if (activity!=null)Toast.makeText(activity, msg.data.getString(Constants.TOAST), Toast.LENGTH_SHORT).show()
}
}
}
}
val mReceiver:BroadcastReceiver = object:BroadcastReceiver(){
override fun onReceive(context: Context, intent: Intent) {
val action = intent.action
if (BluetoothDevice.ACTION_FOUND.equals(action)){
val device = intent.getParcelableExtra<BluetoothDevice>(BluetoothDevice.EXTRA_DEVICE)
if (device.bondState!=BluetoothDevice.BOND_BONDED){
mNewDevicesArrayAdapter.add("${device.name} \n ${device.address}")
}
}else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)){
setProgressBarIndeterminateVisibility(false)
setTitle(R.string.select_device)
if (mNewDevicesArrayAdapter.count==0){
val noDevices = resources.getText(R.string.none_found).toString()
mNewDevicesArrayAdapter.add(noDevices)
}
}
}
}
Here is my AcceptThread as well:
inner class AcceptThread(val secure:Boolean) : Thread(){
var mmServerSocket:BluetoothServerSocket? = null
val mSocketType:String = if (secure) "Secure" else "Insecure"
init {
try {
mmServerSocket = if (secure){
mAdapter.listenUsingRfcommWithServiceRecord(NAME_SECURE, UUID_SECURE)
} else {
mAdapter.listenUsingInsecureRfcommWithServiceRecord(NAME_INSECURE, UUID_INSECURE)
}
}catch (ioe:IOException){
Log.e(TAG, "Socket Type: $mSocketType listen() failed", ioe)
}
mState = STATE_LISTEN
}
override fun run() {
Log.d(TAG, "Socket Type: $mSocketType BEGIN $this")
name = "AcceptThread $mSocketType"
var socket:BluetoothSocket? = null
while (mState!=STATE_CONNECTED){
try {
socket = mmServerSocket!!.accept()
}catch (ioe:IOException){
Log.e(TAG, "Socket Type: $mSocketType accept failed", ioe)
break
}
}
socket?.let {
synchronized(this@BluetoothChatService){
when(mState){
STATE_LISTEN -> {}
STATE_CONNECTING -> {
connected(socket!!, socket!!.remoteDevice, mSocketType)
}
STATE_NONE -> {}
STATE_CONNECTED -> {
try {
it.close()
}catch (ioe:IOException){
Log.e(TAG, "Could not close unwanted socket", ioe)
}
}
else->{throw BluetoothChatServiceException("Invalid Service State")}
}
}
}
Log.i(TAG, "End mAcceptThread, Socket Type: $mSocketType")
}
fun cancel(){
Log.d(TAG, "Socket Type: $mSocketType cancel $this")
try {
mmServerSocket!!.close()
}catch (ioe:IOException){
Log.e(TAG, "Socket Type: $mSocketType close() of server failed", ioe)
}
}
}
Please let me know if you're able to spot anything. I would really appreciate the help. Also, I should mention that the original code was in Java. I am writing mine in Kotlin.
Turns out the problem was my while loop. The while(mState!=STATE_CONNECTED loop should have enclosed the rest of the run() function body. So the solution was just moving the curly brace. Sometimes it's the little things. But I do appreciate the help with my when expressions.