MainAct.kt

package com.lavanya.androidsensors

import android.content.Context
import android.graphics.Color
import android.hardware.Sensor
import android.hardware.Sensor.TYPE_GRAVITY
import android.hardware.Sensor.TYPE_PROXIMITY
import android.hardware.SensorEvent
import android.hardware.SensorEventListener
import android.hardware.SensorManager
import android.os.Bundle
import android.util.Log
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity(), SensorEventListener {

private lateinit var sensorManager: SensorManager
private lateinit var gravSensor: Sensor

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        
         val sensorManager = getSystemService(Context.SENSOR_SERVICE) as SensorManager
         val listOfSensors = sensorManager.getSensorList(Sensor.TYPE_ALL)
         //To see the details of the sensor
         listOfSensors.forEach {
              Log.d("TAG", "Name : " + it.name)
              Log.d("TAG", "Type : " + it.stringType)
              ...
    }
    
        gravSensor = sensorManager.getDefaultSensor(TYPE_GRAVITY)
}

    override fun onAccuracyChanged(sensor: Sensor?, accuracy: Int) {
        //This is called whenever the accuracy of the sensor in use changes.
        //Perform the action.
    }

    override fun onSensorChanged(event: SensorEvent?) {
      //If there is a new sensor data. Perform the action.
    }
    
    //Registering a SensorEventListener
    override fun onResume() {
        super.onResume()
        gravSensor?.also { it ->
        sensorManager.registerListener(this, it, SensorManager.SENSOR_DELAY_NORMAL)
        }
    }

    //Unregistering a SensorEventListener
    override fun onPause() {
        super.onPause()
        sensorManager.unregisterListener(this)
    }
}