Connecting to Smart Gloves Using Bluetooth in Navigation Glove IoT application Using Kotlin - Part 5

<uses-permission android:name="android.permission.BLUETOOTH"/><uses-permission android:name="android.permission.BLUETOOTH_CONNECT" /><uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />

<androidx.recyclerview.widget.RecyclerView    android:id="@+id/recyclerView"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:layout_above="@+id/pairedDeviceBtn"    android:layout_below="@id/messageTv"    tools:listitem="@layout/paired_device_list_item"/>

<?xml version="1.0" encoding="utf-8"?><androidx.cardview.widget.CardView 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="80dp"    android:layout_margin="10dp"    app:cardElevation="6dp">    <LinearLayout        android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_gravity="center"        android:gravity="center|start"        android:orientation="horizontal"        android:padding="5dp"        android:id="@+id/rootLayout">        <ImageView            android:id="@+id/imageview"            android:layout_width="50dp"            android:layout_height="50dp"            android:layout_marginStart="5dp"            android:src="@drawable/gloves_ic"            android:visibility="visible" />        <LinearLayout            android:layout_width="match_parent"            android:layout_height="match_parent"            android:layout_marginStart="5dp"            android:orientation="vertical">            <LinearLayout                android:layout_width="match_parent"                android:layout_height="wrap_content"                android:layout_gravity="center"                android:layout_weight="1"                android:gravity="center|start"                android:orientation="horizontal">                <TextView                    android:layout_width="wrap_content"                    android:layout_height="wrap_content"                    android:layout_marginStart="10dp"                    android:layout_marginLeft="15dp"                    android:text="@string/name"                    android:textSize="16sp"                    android:textStyle="bold" />                <TextView                    android:id="@+id/deviceName"                    android:layout_width="wrap_content"                    android:layout_height="wrap_content"                    android:layout_marginStart="10dp"                    android:layout_marginLeft="15dp"                    android:textSize="16sp"                    android:textStyle="bold" />            </LinearLayout>            <LinearLayout                android:layout_width="match_parent"                android:layout_height="wrap_content"                android:layout_gravity="center"                android:layout_weight="1"                android:gravity="center|start"                android:orientation="horizontal">                <TextView                    android:layout_width="wrap_content"                    android:layout_height="wrap_content"                    android:layout_marginStart="10dp"                    android:layout_marginLeft="15dp"                    android:text="@string/mac_address"                    android:textSize="16sp"                    android:textStyle="bold" />                <TextView                    android:id="@+id/macAddress"                    android:layout_width="wrap_content"                    android:layout_height="wrap_content"                    android:layout_marginStart="10dp"                    android:layout_marginLeft="15dp"                    android:textSize="16sp"                    android:textStyle="bold" />            </LinearLayout>        </LinearLayout>    </LinearLayout></androidx.cardview.widget.CardView>

package com.huawei.navigationglove.modeldata class DeviceModel(val name: String, val macAddress: String)

private lateinit var linearLayoutManager: LinearLayoutManager

private var pairedDeviceList = ArrayList<DeviceModel>()var deviceModel: DeviceModel? = null

linearLayoutManager = LinearLayoutManager(this)recyclerView.layoutManager = linearLayoutManager

package com.huawei.navigationglove.ui.adaptersimport android.view.LayoutInflaterimport android.view.Viewimport android.view.ViewGroupimport android.widget.LinearLayoutimport android.widget.TextViewimport androidx.recyclerview.widget.RecyclerViewimport com.huawei.navigationglove.Rimport com.huawei.navigationglove.callbacks.OnDeviceClickCallbackimport com.huawei.navigationglove.model.DeviceModelclass PairedDevicesAdapter(    private val mList: List<DeviceModel>,    private val onDeviceClickCallback: OnDeviceClickCallback) :    RecyclerView.Adapter<PairedDevicesAdapter.ViewHolder>() {    // create new views    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {        val view = LayoutInflater.from(parent.context)            .inflate(R.layout.paired_device_list_item, parent, false)        return ViewHolder(view)    }    override fun onBindViewHolder(holder: ViewHolder, position: Int) {        val deviceModel = mList[position]        holder.deviceName.text = deviceModel.name        holder.macAddress.text = deviceModel.macAddress        holder.rootLayout.setOnClickListener { onDeviceClickCallback.onDeviceClick(deviceModel) }    }    // return the number of the items in the list    override fun getItemCount(): Int {        return mList.size    }    // Holds the views for adding it to image and text    class ViewHolder(ItemView: View) : RecyclerView.ViewHolder(ItemView) {        val deviceName: TextView = itemView.findViewById(R.id.deviceName)        val macAddress: TextView = itemView.findViewById(R.id.macAddress)        val rootLayout: LinearLayout = itemView.findViewById(R.id.rootLayout)    }}

private fun pairedDevicesList() {    pairedDeviceList = ArrayList<DeviceModel>()    pairedDevices = myBluetooth!!.bondedDevices    val list: ArrayList<String> = ArrayList<String>()    if ((pairedDevices as MutableSet<BluetoothDevice>?)!!.size > 0) {        for (bt in (pairedDevices as MutableSet<BluetoothDevice>?)!!) {            Log.e(TAG, bt.name + "
" + bt.address)            list.add(bt.name + "
" + bt.address) //Get the device's name and the address            deviceModel = DeviceModel(bt.name, bt.address)            pairedDeviceList.add(deviceModel!!)        }        val adapter = PairedDevicesAdapter(pairedDeviceList, this)        recyclerView.adapter = adapter    } else {        Toast.makeText(            applicationContext,            "No Paired Bluetooth Devices Found.",            Toast.LENGTH_LONG        ).show()    }}

Create OnDeviceClickCallback.kt interface.package com.huawei.navigationglove.callbacksimport com.huawei.navigationglove.model.DeviceModelinterface OnDeviceClickCallback {fun onDeviceClick(deviceModel: DeviceModel)}

class ConnectSmartGlovesActivity : AppCompatActivity(), OnDeviceClickCallback {

override fun onDeviceClick(deviceModel: DeviceModel) {address = deviceModel.macAddressConnectBT(this).execute()}

private var progress: ProgressDialog? =null //This progress dialog box while connecting to bluetoothprivate var isBtConnected = falsevar btSocket: BluetoothSocket? = null //Bridge which sends data to bluetooth from Android appvar myBluetooth: BluetoothAdapter? = nullval myUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB") //Uniquevar address: String? = null

open class ConnectBT(val context: Context) : AsyncTask<Void?, Void?, Void?>() // UI thread{    private var ConnectSuccess = true //if it's here, it's almost connected    override fun onPreExecute() {        progress = ProgressDialog.show(            context,            "Connecting...",            "Please wait!!!"        ) //show a progress dialog    }    @SuppressLint("MissingPermission")    override fun doInBackground(vararg devices: Void?): Void? //while the progress dialog is shown, the connection is done in background    {        try {            if (btSocket == null || !isBtConnected) {                myBluetooth =                    BluetoothAdapter.getDefaultAdapter() //get the mobile bluetooth device                val dispositivo: BluetoothDevice = myBluetooth!!.getRemoteDevice(address) //connects to the device's address and checks if it's available                Log.e(TAG,"Device: "+Gson().toJson(dispositivo))                btSocket = dispositivo.createInsecureRfcommSocketToServiceRecord(myUUID) //create a RFCOMM (SPP) connection                Log.e(TAG,"Device: "+Gson().toJson(btSocket))                BluetoothAdapter.getDefaultAdapter().cancelDiscovery()                btSocket!!.connect() //start connection            }        } catch (e: IOException) {            ConnectSuccess = false //if the try failed, you can check the exception here            Log.e("MapsActivity","Device not connected" +e.message)        }        return null    }    override fun onPostExecute(result: Void?) //after the doInBackground, it checks if everything went fine    {        super.onPostExecute(result)        if (!ConnectSuccess) {            val toast =                Toast.makeText(context, "Failure", Toast.LENGTH_LONG)            toast.show()            val handler = Handler()            handler.postDelayed({ toast.cancel() }, 300)            //TODO need to check this            //finish()        } else {            val toast = Toast.makeText(context, "Success.", Toast.LENGTH_LONG)            toast.show()            val handler = Handler()            handler.postDelayed({ toast.cancel() }, 300)            //msg("Connected.");            SystemClock.sleep(1000)            isBtConnected = true        }        progress!!.dismiss()    }}

val filter = IntentFilter()filter.addAction(BluetoothDevice.ACTION_ACL_CONNECTED)filter.addAction(BluetoothDevice.ACTION_ACL_DISCONNECT_REQUESTED)filter.addAction(BluetoothDevice.ACTION_ACL_DISCONNECTED)this.registerReceiver(nReceiver, filter)

//This BroadcastReceiver finds listens the status of bluetoothprivate val nReceiver: BroadcastReceiver? = object : BroadcastReceiver() {    @RequiresApi(Build.VERSION_CODES.M)    override fun onReceive(context: Context, intent: Intent) {        val action = intent.action        val device = intent.getParcelableExtra<BluetoothDevice>(BluetoothDevice.EXTRA_DEVICE)        if (BluetoothDevice.ACTION_FOUND == action) {        } else if (BluetoothDevice.ACTION_ACL_CONNECTED == action) {            co = true            Log.e("mode:", "Connected")            requestLocationUpdatesWithCallback()        } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED == action) {        } else if (BluetoothDevice.ACTION_ACL_DISCONNECT_REQUESTED == action) {            Log.e("mode:", "disConnected")        } else if (BluetoothDevice.ACTION_ACL_DISCONNECTED == action) {            co = false            Log.e("mode:", "disConnected1")            val vib = context.getSystemService(Vibrator::class.java)            Log.e("Vibe", "" + vib.hasVibrator())            //t1.speak("Your Bluetooth Has Been Disconnected", TextToSpeech.QUEUE_FLUSH, null);            for (i in 0..4) {                vib.vibrate(700)                SystemClock.sleep(1000)            }            i = 0        }    }}