Bluetooth

=========================================================================
Gradle
=========================================================================
    implementation 'com.karumi:dexter:6.2.3'
 
=========================================================================
 Manifest
=========================================================================
 
    <uses-permission android:name="android.permission.BLUETOOTH" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" />
    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />

    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
    
=========================================================================
Layout MainActivity
========================================================================= 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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=".MainActivity">



        <TextView android:text=""
            android:id="@+id/out"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">
        </TextView>
        <Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true"
            android:layout_marginLeft="30dp"
            android:layout_marginTop="49dp"
            android:text="TURN_ON" />

        <Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@+id/button1"
            android:layout_below="@+id/button1"
            android:layout_marginTop="27dp"
            android:text="DISCOVERABLE" />

        <Button
            android:id="@+id/button3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@+id/button2"
            android:layout_below="@+id/button2"
            android:layout_marginTop="28dp"
            android:text="TURN_OFF" />

    </RelativeLayout>

=========================================================================
MainActivity
=========================================================================


import android.bluetooth.BluetoothAdapter
import android.bluetooth.BluetoothManager
import android.content.Context
import android.content.Intent
import android.os.Build
import android.os.Bundle 
import android.view.View
import android.widget.Toast
import androidx.annotation.RequiresApi
import androidx.appcompat.app.AppCompatActivity
 

class MainActivity : AppCompatActivity() {

    private val REQUEST_ENABLE_BT = 0
    private val REQUEST_DISCOVERABLE_BT = 0


    @RequiresApi(Build.VERSION_CODES.S)
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

      
        var button1 =  findViewById<View>(R.id.button1);
        var button2 =   findViewById<View>(R.id.button2);
        var button3 =  findViewById<View>(R.id.button3);


        val bluetoothManager = getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
        var mBluetoothAdapter = bluetoothManager.adapter


        button1.setOnClickListener(View.OnClickListener() {
            if (!mBluetoothAdapter.isEnabled()) {
                //Manifest.permission.BLUETOOTH_CONNECT
                val enableBtIntent =  Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE)
                startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT)
                
            }
        })
        button2.setOnClickListener(View.OnClickListener() {

            //Manifest.permission.BLUETOOTH_SCAN
            if (!mBluetoothAdapter.isDiscovering()) {
             
                Toast.makeText(
                    getApplicationContext(), "MAKING YOUR DEVICE DISCOVERABLE",
                    Toast.LENGTH_LONG
                );

                val enableBtIntent =  Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
                startActivityForResult(enableBtIntent, REQUEST_DISCOVERABLE_BT);

            }


        })
        button3.setOnClickListener( View.OnClickListener() {
        
        //Manifest.permission.BLUETOOTH_CONNECT
            mBluetoothAdapter.disable();
    
            Toast.makeText(getApplicationContext(), "TURNING_OFF BLUETOOTH", Toast.LENGTH_LONG);

        })
    }

}