I have a problem with my bluetooth scanner.I'm using a samsung A50 with android 11 .So my Bluetooth is supposed to check the surrounding bluetooth devices and then add them into an ArrayList and display it on screen with a recyclerview. The problem is I don't find any device. I tried to debug my code and It seems that my code doesn't go to mReceiver that's why I don't detect any device. The code was working last week I found the devices (I found the same device multiple times it's normal) but they didn't add to the ArrayList. So Now I'm asking you guys here is my code. I'm pretty sure I gave all the permissions necessary and even more and I also given the location permission to my app.
This is The Activity:
class ConnectionActivity : AppCompatActivity(),BluetoothOnItemClickListener{
private lateinit var binding : ActivityConnectionBinding
private lateinit var manager : RecyclerView.LayoutManager
val dataset = Datasource().loadDataBluetooth()
private val devices_list : ArrayList<BluetoothDevice> = ArrayList()
var m_bluetoothAdapter : BluetoothAdapter? = null
val REQUEST_ENABLE_BLUETOOTH = 1
companion object{
val EXTRA_ADDRESS :String = "Device_address"
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityConnectionBinding.inflate(layoutInflater)
setContentView(binding.root)
supportActionBar?.setDisplayHomeAsUpEnabled(true)
supportActionBar?.title = "Bluetooth"
m_bluetoothAdapter = BluetoothAdapter.getDefaultAdapter()
if(m_bluetoothAdapter == null){
Toast.makeText(this, "not supported", Toast.LENGTH_SHORT).show()
return
}
if (!m_bluetoothAdapter!!.isEnabled){
val enableBluetoothIntent = Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE)
startActivityForResult(enableBluetoothIntent,REQUEST_ENABLE_BLUETOOTH)
val discoverableIntent: Intent = Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE).apply {
putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300)
}
startActivity(discoverableIntent)
}else{
discoverDevices()}
}
private val mReceiver = object : BroadcastReceiver() {
override fun onReceive(context: Context, intent: Intent) {
val action = intent.action
if (BluetoothDevice.ACTION_FOUND == action) {
// A Bluetooth device was found
// Getting device information from the intent
val device = intent.getParcelableExtra<BluetoothDevice>(BluetoothDevice.EXTRA_DEVICE)
if (device != null) {
devices_list.add(device)
println("SIZE : ${devices_list.size}")
}
}
}
}
private fun discoverDevices(){
if (m_bluetoothAdapter!!.isDiscovering) {
// Bluetooth is already in mode discovery mode, we cancel to restart it again
m_bluetoothAdapter!!.cancelDiscovery()
}
val bool = m_bluetoothAdapter?.startDiscovery()
Log.i("", bool.toString())
val filter = IntentFilter(BluetoothDevice.ACTION_FOUND)
registerReceiver(mReceiver, IntentFilter(BluetoothDevice.ACTION_FOUND))
println("Count : ${devices_list.size}")
manager = LinearLayoutManager(this)
binding.recycleView.adapter = ItemAdapter(devices_list,this)
binding.recycleView.layoutManager = manager
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (requestCode == REQUEST_ENABLE_BLUETOOTH) {
if (resultCode == Activity.RESULT_OK) {
if (m_bluetoothAdapter!!.isEnabled) {
Toast.makeText(this, "Bluetooth enabled", Toast.LENGTH_SHORT).show()
discoverDevices()
} else {
Toast.makeText(this, "Bluetooth disabled", Toast.LENGTH_SHORT).show()
}
} else if (resultCode == Activity.RESULT_CANCELED) {
Toast.makeText(this, "Bluetooth enabling has been canceled", Toast.LENGTH_SHORT).show()
}
}
}
override fun onCreateOptionsMenu(menu: Menu?): Boolean {
val inflater: MenuInflater = menuInflater
inflater.inflate(R.menu.menu_connection, menu)
return true
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
when (item.itemId) {
R.id.ic_ip -> Toast.makeText(this, "IP", Toast.LENGTH_SHORT).show()
}
return super.onOptionsItemSelected(item)
}
override fun onStop() {
super.onStop()
unregisterReceiver(mReceiver)
}
}
And This is the Adapter :
class ItemAdapter(private val devices : ArrayList<BluetoothDevice>, var clickListener: BluetoothOnItemClickListener): RecyclerView.Adapter<ItemAdapter.ItemViewHolder>(){
inner class ItemViewHolder(val binding: ListItemBinding) : RecyclerView.ViewHolder(binding.root){
fun bind(item : BluetoothDevice,action: BluetoothOnItemClickListener){
binding.item?.StringNameB = item.name
itemView.setOnClickListener {
binding.item?.checked = true
notifyItemChanged(bindingAdapterPosition)
}
}
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ItemViewHolder {
val inflater = LayoutInflater.from(parent.context)
val adapterlayout = ListItemBinding.inflate(inflater,parent,false)
return ItemViewHolder(adapterlayout)
}
override fun onBindViewHolder(holder: ItemViewHolder, position: Int) {
holder.bind(devices[position],clickListener)
holder.binding.executePendingBindings()
}
override fun getItemCount(): Int {
return devices.size
}
}
interface BluetoothOnItemClickListener{
}
And this is my the permissions I have in my manifest
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-permission android:name="android.permission.BLUETOOTH_CONNECT"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
