BtMonitor Kotlin | #5

ControlActivity

import android.bluetooth.BluetoothManager
import android.content.Context
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.view.Menu
import android.view.MenuItem
import androidx.activity.result.ActivityResultLauncher
import androidx.activity.result.contract.ActivityResultContracts
import com.neco_desarrollo.btmonitorkotlin.databinding.ActivityControlBinding

class ControlActivity : AppCompatActivity() {
    private lateinit var binding: ActivityControlBinding
    private lateinit var actListLauncher: ActivityResultLauncher<Intent>
    lateinit var btConnection: BtConnection
    private var listItem: ListItem? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityControlBinding.inflate(layoutInflater)
        setContentView(binding.root)
        onBtListResult()
        init()
        binding.apply {
            bA.setOnClickListener {
                btConnection.sendMessage("A")
            }
            bB.setOnClickListener {
                btConnection.sendMessage("B")
            }
        }

    }

    private fun init(){
        val btManager = getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
        val btAdapter = btManager.adapter
        btConnection = BtConnection(btAdapter)
    }

    override fun onCreateOptionsMenu(menu: Menu?): Boolean {
        menuInflater.inflate(R.menu.control_menu, menu)
        return super.onCreateOptionsMenu(menu)
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        if(item.itemId == R.id.id_list){
            actListLauncher.launch(Intent(this, BtListActivity::class.java))
        } else if(item.itemId == R.id.id_connect){
             listItem.let {
                 btConnection.connect(it?.mac!!)
             }
        }
        return super.onOptionsItemSelected(item)
    }

    private fun onBtListResult(){
        actListLauncher = registerForActivityResult(
            ActivityResultContracts.StartActivityForResult()){
            if(it.resultCode == RESULT_OK){
                listItem = it.data?.getSerializableExtra(BtListActivity.DEVICE_KEY) as ListItem
            }
        }
    }
}

BtListActivity

import android.bluetooth.BluetoothAdapter
import android.bluetooth.BluetoothDevice
import android.bluetooth.BluetoothManager
import android.content.Context
import android.content.Intent
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 BtListActivity : AppCompatActivity(), RcAdapter.Listener {
    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(this)
        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)
    }

    companion object{
        const val DEVICE_KEY = "device_key"
    }

    override fun onClick(item: ListItem) {
        val i= Intent().apply {
            putExtra(DEVICE_KEY, item)
        }
        setResult(RESULT_OK, i)
        finish()
    }
}

BtConnection

import android.bluetooth.BluetoothAdapter

class BtConnection(private val adapter: BluetoothAdapter) {
    lateinit var cThread: ConnectThread
    fun connect(mac: String) {
        if (adapter.isEnabled && mac.isNotEmpty()) {
            val device = adapter.getRemoteDevice(mac)
            device.let {
                cThread = ConnectThread(it)
                cThread.start()
            }
        }
    }
    fun sendMessage(message: String){
        cThread.rThread.sendMessage(message.toByteArray())
    }

}

ConnectThread

import android.bluetooth.BluetoothDevice
import android.bluetooth.BluetoothSocket
import android.util.Log
import java.io.IOException
import java.util.*

class ConnectThread(private val device: BluetoothDevice) : Thread() {
    val uuid = "00001101-0000-1000-8000-00805F9B34FB"
    var mSocket: BluetoothSocket? = null
    lateinit var rThread: ReceiveThread

    init {
        try {
           mSocket = device.createRfcommSocketToServiceRecord(UUID.fromString(uuid))
        }catch (i: IOException){

        }
    }

    override fun run() {
        try {
            Log.d("MyLog","Connecting...")
            mSocket?.connect()
            Log.d("MyLog","Connected")
            rThread = ReceiveThread(mSocket!!)
            rThread.start()
        }catch (i: IOException){
            Log.d("MyLog","Can not connect to device")
           closeConnection()
        }
    }

    fun closeConnection(){
        try {
            mSocket?.close()
        }catch (i: IOException){

        }
    }
}

ListItem

import java.io.Serializable

data class ListItem(
    var name: String,
    var mac: String
): Serializable

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(private val listener: Listener) : ListAdapter<ListItem, RcAdapter.ItemHolder>(ItemComparator()) {

    class ItemHolder(view: View) : RecyclerView.ViewHolder(view){
        val binding = ListItemBinding.bind(view)

        fun setData(item: ListItem, listener: Listener) = with(binding){
            tvName.text = item.name
            tvMac.text = item.mac
            itemView.setOnClickListener {
                listener.onClick(item)
            }
        }
        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), listener)
    }

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

ReceiveThread

import android.bluetooth.BluetoothSocket
import android.util.Log
import java.io.IOException
import java.io.InputStream
import java.io.OutputStream

class ReceiveThread(val bSocket: BluetoothSocket) : Thread() {
    var inStream: InputStream? = null
    var outStream: OutputStream? = null
    init {
       try {
          inStream = bSocket.inputStream
       } catch (i: IOException){

       }
        try {
           outStream = bSocket.outputStream
        } catch (i: IOException){

        }
    }

    override fun run() {
        val buf = ByteArray(2)
        while (true){
            try{
               val size = inStream?.read(buf)
               val message = String(buf, 0, size!!)
                Log.d("MyLog","Message: $message")
            } catch (i: IOException){
                break
            }
        }
    }
    fun sendMessage(byteArray: ByteArray){
        try {
           outStream?.write(byteArray)
        } catch (i: IOException){

        }
    }
}

activity_control.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"
    tools:context=".ControlActivity">

    <Button
        android:id="@+id/bB"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="Send B"
        app:layout_constraintBottom_toTopOf="@+id/bA"
        app:layout_constraintEnd_toEndOf="@+id/bA"
        app:layout_constraintStart_toStartOf="@+id/bA" />

    <Button
        android:id="@+id/bA"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginEnd="8dp"
        android:text="Send A"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

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=".BtListActivity">

    <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>

control_menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
   <item
       android:id="@+id/id_connect"
       android:title="Connect"
       android:orderInCategory="100"
       app:showAsAction="ifRoom"
       android:icon="@drawable/ic_connect"
       />
    <item
        android:id="@+id/id_list"
        android:title="Bt List"
        android:orderInCategory="200"
        app:showAsAction="ifRoom"
        android:icon="@drawable/ic_list"
        />
</menu>

2 комментария для “BtMonitor Kotlin | #5”

  2. Казбек

    Спасибо большое тебе Сергей! Жаль что этот курс был мене интересен публике, но оно очень помогло мне с научным проектом, которое нуждалось в таком приложении(на базе этого приложения). Нигде не мог найти нормальные обучающие видео по android+arduino на русском языке. Ещё раз благодарю за твой труд. Обязательно пересмотрю твои другие уроки.

    Ответить

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