I am working on Bluetooth receiving and sending data. I can send data via Bluetooth but it doesn't work the receive data. I want to get string data and split it. And the split data will show the list view. Since data import is not working, I created string data and called the split method, but it didn't work here either in a release. Can you help me? Here are my Activity codes;
var mUUID: UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB")
var mBluetoothSocket: BluetoothSocket? = null
lateinit var mProgress: ProgressDialog
lateinit var mBluetoothAdapter: BluetoothAdapter
var mIsConnected: Boolean = false
lateinit var mAddress: String
lateinit var inputStream: InputStream
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityListBinding.inflate(layoutInflater)
val view = binding.root
setContentView(view)
mAddress = intent.getStringExtra(MainActivity.EXTRA_ADDRESS).toString()
ConnectToDevice(this).execute()
run()
binding.deneme.setOnClickListener {
sendCommand("denemebeyza")
Log.d("mesajBT", "onCreate: mesaj gonderildi")
}
val string2: String = "deneme, deneme02K, deneme90,klm08B,bitti."
splitList(string2)
}
private fun sendCommand(input: String) {
if (mBluetoothSocket != null) {
try {
mBluetoothSocket!!.outputStream.write(input.toByteArray())
} catch (e: IOException) {
e.printStackTrace()
}
}
}
fun run() {
val LOGTAG: String ="ReadListString"
Log.i(LOGTAG, Thread.currentThread().name)
val buffer = ByteArray(8)
var bytes: Int
val text1: TextView = binding.text2
var readText : String
Log.d("mesajBt", "mesaj metodu")
//Loop to listen for received bluetooth messages
if (mBluetoothSocket != null) {
while (true) {
bytes = try {
bytes = inputStream.read(buffer) ?:0
readText = String(buffer, 0, bytes)
Log.e("Arduino Message", readText)
} catch (e: IOException) {
e.printStackTrace()
Log.d("Else", "message alinamadi.")
break
}
text1.text =readText
}
}
}
fun splitList(output: String) {
val listView : ListView= binding.list1
val textView: TextView= binding.text1
if (mBluetoothSocket != null) {
try {
val list: List<String> = output.split(",").toList()
var arrayAdapter: ArrayAdapter<*>
for (it in list) {
Log.e("TAG", "splitList: $list ")
val list2: ArrayList<String> = ArrayList(list)
textView.text = list2.toString()
}
arrayAdapter = ArrayAdapter(this, android.R.layout.simple_list_item_1, list)
listView.adapter=arrayAdapter
} catch (e: IOException) {
e.printStackTrace()
}
// [A, B, C, D]
}
}
private class ConnectToDevice(c: Context) : AsyncTask<Void, Void, String>() {
private var connectSuccess: Boolean = true
@SuppressLint("StaticFieldLeak")
val context: Context = c
@Deprecated("Deprecated in Java")
override fun onPreExecute() {
super.onPreExecute()
mProgress = ProgressDialog.show(
context,
context.getString(R.string.connecting),
context.getString(R.string.connecting)
)
}
@SuppressLint("MissingPermission")
override fun doInBackground(vararg p0: Void?): String? {
try {
if (mBluetoothSocket == null || !mIsConnected) {
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter()
val device: BluetoothDevice = mBluetoothAdapter.getRemoteDevice(mAddress)
mBluetoothSocket = device.createInsecureRfcommSocketToServiceRecord(mUUID)
BluetoothAdapter.getDefaultAdapter().cancelDiscovery()
mBluetoothSocket!!.connect()
inputStream = mBluetoothSocket!!.inputStream
}
}catch (e: IOException) {
connectSuccess = false
e.printStackTrace()
}
return null
}
override fun onPostExecute(result: String?) {
super.onPostExecute(result)
if (!connectSuccess) {
Log.i("data", "couldn't connect")
} else {
mIsConnected = true
}
mProgress.dismiss()
}
}
}
Here is debugged console log.e output
Thanks, advance :)
I/ReadList-run: main
E/mesajBt: mesaj metodu
W/BluetoothAdapter:getBluetoothService() called with no BluetoothManagerCallback
W/libEGL: EGLNativeWindowType 0xc9a7d808 disconnect failed
W/libEGL:EGLNativeWindowType 0xc95be008 disconnect failed
I/InputMethodManager: startInputInner mService.startInputOrWindowGainedFocus E/ViewRootImpl:sendUserActionEvent() returned.
I/InputMethodManager: startInputInner - mService.startInputOrWindowGainedFocus
Since there will be commas between words in data coming from Bluetooth, I used a comma as a separator in the split method. After some research, I corrected a few mistakes. You can change the value of the bytes as 8-16-32-64 according to the incoming data type and size. Receive method is here
private fun run() {
//Loop to listen for received bluetooth messages
if (mBluetoothSocket != null) {
val TAG: String = "ReadList-run"
Log.i(TAG, Thread.currentThread().name)
val buffer = ByteArray(1024)
var bytes: Int
var readText: String
Log.e("mesajBt", "mesaj metodu")
while (true) {
try {
bytes = inputStream.read(buffer)
readText = String(buffer, 0, bytes)
Log.e("Arduino Message", readText)
splitlist(readText)
break
} catch (e: IOException) {
e.printStackTrace()
Log.d("Else", "message alinamadi.")
break
}
}
}
}
Here is my split method
fun splitList(output: String) {
if (mBluetoothSocket != null) {
try {
val list: List<String> = output.split(",").toList()
for (it in list) {
Log.e("TAG", "splitList: $list ")
}
} catch (e: IOException) {
e.printStackTrace()
}
// [A, B, C, D]
}
}