Bluetooth module | #9

DeviceListFragment

import android.app.Activity
import android.bluetooth.BluetoothAdapter
import android.bluetooth.BluetoothDevice
import android.bluetooth.BluetoothManager
import android.content.Context
import android.content.Intent
import android.content.SharedPreferences
import android.graphics.Color
import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.activity.result.ActivityResultLauncher
import androidx.activity.result.contract.ActivityResultContracts
import androidx.recyclerview.widget.LinearLayoutManager
import com.google.android.material.snackbar.Snackbar
import com.neco_dev.bt_def.databinding.FragmentListBinding

class DeviceListFragment : Fragment(), ItemAdapter.Listener {
    private var preferences: SharedPreferences? = null
    private lateinit var itemAdapter: ItemAdapter
    private var bAdapter: BluetoothAdapter? = null
    private lateinit var binding: FragmentListBinding
    private lateinit var btLauncher: ActivityResultLauncher<Intent>

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        binding = FragmentListBinding.inflate(inflater, container, false)
        return binding.root
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        preferences = activity?.getSharedPreferences(BluetoothConstants.PREFERENCES, Context.MODE_PRIVATE)
        binding.imBluetoothOn.setOnClickListener {
           btLauncher.launch(Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE))
        }
        initRcViews()
        registerBtLauncher()
        initBtAdapter()
        bluetoothState()
    }

    private fun initRcViews() = with(binding){
        rcViewPaired.layoutManager = LinearLayoutManager(requireContext())
        itemAdapter = ItemAdapter(this@DeviceListFragment)
        rcViewPaired.adapter = itemAdapter
    }

    private fun getPairedDevices(){
        try {
            val list = ArrayList<ListItem>()
            val deviceList = bAdapter?.bondedDevices as Set<BluetoothDevice>
            deviceList.forEach{
               list.add(
                   ListItem(
                       it.name,
                       it.address,
                       preferences?.getString(BluetoothConstants.MAC, "") == it.address
                   )
               )
            }
            binding.tvEmptyPaired.visibility = if(list.isEmpty()) View.VISIBLE else View.GONE
            itemAdapter.submitList(list)
        } catch (e: SecurityException){

        }

    }

    private fun initBtAdapter(){
      val bManager = activity?.getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
      bAdapter = bManager.adapter
    }

    private fun bluetoothState(){
        if (bAdapter?.isEnabled == true){
        changeButtonColor(binding.imBluetoothOn, Color.GREEN)
            getPairedDevices()
        }
    }

    private fun registerBtLauncher(){
        btLauncher = registerForActivityResult(
            ActivityResultContracts.StartActivityForResult()
        ){
            if (it.resultCode == Activity.RESULT_OK){
                changeButtonColor(binding.imBluetoothOn, Color.GREEN)
                getPairedDevices()
                Snackbar.make(binding.root, "Блютуз включен!", Snackbar.LENGTH_LONG).show()
            } else {
                Snackbar.make(binding.root, "Блютуз выключен!", Snackbar.LENGTH_LONG).show()
            }
        }
    }

    private fun saveMac(mac: String){
        val editor = preferences?.edit()
        editor?.putString(BluetoothConstants.MAC, mac)
        editor?.apply()
    }

    override fun onClick(device: ListItem) {
       saveMac(device.mac)
    }

}

ItemAdapter

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.CheckBox
import androidx.recyclerview.widget.DiffUtil
import androidx.recyclerview.widget.ListAdapter
import androidx.recyclerview.widget.RecyclerView
import com.neco_dev.bt_def.databinding.ListItemBinding

class ItemAdapter(private val listener: Listener) :
    ListAdapter<ListItem, ItemAdapter.MyHolder>(Comparator()) {
    private var oldCheckBox: CheckBox? = null

    class MyHolder(
        view: View, private val adapter: ItemAdapter,
        private val listener: Listener
    ) : RecyclerView.ViewHolder(view) {
        private val b = ListItemBinding.bind(view)
        private var device: ListItem? = null

        init {
            b.checkBox.setOnClickListener {
                device?.let { it1 -> listener.onClick(it1) }
                adapter.selectCheckBox(it as CheckBox)
            }
            itemView.setOnClickListener {
                device?.let { it1 -> listener.onClick(it1) }
                adapter.selectCheckBox(b.checkBox)
            }
        }

        fun bind(item: ListItem) = with(b) {
            device = item
            name.text = item.name
            mac.text = item.mac
            if (item.isChecked) adapter.selectCheckBox(checkBox)
        }
    }

    class Comparator : DiffUtil.ItemCallback<ListItem>() {
        override fun areItemsTheSame(oldItem: ListItem, newItem: ListItem): Boolean {
            return oldItem == newItem
        }

        override fun areContentsTheSame(oldItem: ListItem, newItem: ListItem): Boolean {
            return oldItem == newItem
        }
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyHolder {
        val view = LayoutInflater.from(parent.context)
            .inflate(R.layout.list_item, parent, false)
        return MyHolder(view, this, listener)
    }

    override fun onBindViewHolder(holder: MyHolder, position: Int) {
        holder.bind(getItem(position))
    }

    fun selectCheckBox(checkBox: CheckBox) {
        oldCheckBox?.isChecked = false
        oldCheckBox = checkBox
        oldCheckBox?.isChecked = true
    }

    interface Listener {
        fun onClick(device: ListItem)
    }
}

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