MainActivity
import android.bluetooth.BluetoothAdapter
import android.bluetooth.BluetoothDevice
import android.bluetooth.BluetoothManager
import android.content.Context
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import androidx.recyclerview.widget.LinearLayoutManager
import com.neco_desarrollo.btmonitorkotlin.databinding.ActivityMainBinding
class MainActivity : AppCompatActivity() {
private var btAdapter: BluetoothAdapter? = null
private lateinit var binding: ActivityMainBinding
private lateinit var adapter: RcAdapter
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
init()
}
private fun init(){
val btManager = getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
btAdapter = btManager.adapter
adapter = RcAdapter()
binding.rcView.layoutManager = LinearLayoutManager(this)
binding.rcView.adapter = adapter
getPairedDevises()
}
private fun getPairedDevises(){
val pairedDevices: Set<BluetoothDevice>? = btAdapter?.bondedDevices
val tempList = ArrayList<ListItem>()
pairedDevices?.forEach {
tempList.add(ListItem(it.name, it.address))
}
adapter.submitList(tempList)
}
}
ListItem
data class ListItem(
var name: String,
var mac: String
)
RcAdapter
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.DiffUtil
import androidx.recyclerview.widget.ListAdapter
import androidx.recyclerview.widget.RecyclerView
import com.neco_desarrollo.btmonitorkotlin.databinding.ListItemBinding
class RcAdapter : ListAdapter<ListItem, RcAdapter.ItemHolder>(ItemComparator()) {
class ItemHolder(view: View) : RecyclerView.ViewHolder(view){
val binding = ListItemBinding.bind(view)
fun setData(item: ListItem) = with(binding){
tvName.text = item.name
tvMac.text = item.mac
}
companion object{
fun create(parent: ViewGroup): ItemHolder{
return ItemHolder(LayoutInflater.
from(parent.context).
inflate(R.layout.list_item, parent, false))
}
}
}
class ItemComparator : DiffUtil.ItemCallback<ListItem>(){
override fun areItemsTheSame(oldItem: ListItem, newItem: ListItem): Boolean {
return oldItem.mac == newItem.mac
}
override fun areContentsTheSame(oldItem: ListItem, newItem: ListItem): Boolean {
return oldItem == newItem
}
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ItemHolder {
return ItemHolder.create(parent)
}
override fun onBindViewHolder(holder: ItemHolder, position: Int) {
holder.setData(getItem(position))
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#C8C6C6"
tools:context=".MainActivity">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rcView"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<androidx.cardview.widget.CardView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="3dp"
android:layout_marginTop="5dp"
android:layout_marginEnd="3dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="5dp">
<TextView
android:id="@+id/tvName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="TextView"
android:textColor="@color/black"
android:textStyle="bold" />
<TextView
android:id="@+id/tvMac"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="TextView"
android:textSize="12sp" />
</LinearLayout>
</androidx.cardview.widget.CardView>
</androidx.constraintlayout.widget.ConstraintLayout>