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App crashes/ implementing picture in picture mode to timer

When I tried to emmulate the app that I coded in the connected phone, it keeps closing due to crashes, is there any problem in my code?

Also, I am trying to make a timer app with picture and picture mode. I followed the tutorials and try to to combine these:

https://www.youtube.com/watch?v=AIhBJIdP6HE

https://www.youtube.com/watch?v=lDpd3mLWYK4&feature=emb_title

It works individually but when I tried to combine, it does not work. Could I please get help for it? Thank you

Mainactivity 







`class MainActivity : AppCompatActivity()
{

   lateinit var binding: ActivityMainBinding
    lateinit var dataHelper: DataHelper

    private val timer = Timer()



    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        PIP.setOnClickListener {
          if (Build.VERSION.SDK_INT >= VERSION_CODES.O) {
              val mpipParams = PictureInPictureParams.Builder()
              val display = windowManager.defaultDisplay
              val point = Point()
              display.getSize(point)
              mpipParams.setAspectRatio(Rational(point.x,point.y))
              enterPictureInPictureMode(mpipParams.build())
            }


        }


















            binding = ActivityMainBinding.inflate(layoutInflater)
            setContentView(binding.root)
            dataHelper = DataHelper(applicationContext)

            binding.startButton.setOnClickListener { startStopAction() }
            binding.resetButton.setOnClickListener { resetAction() }

            if(dataHelper.timerCounting())
            {
                startTimer()
            }
            else
            {
                stopTimer()
                if(dataHelper.startTime() !=null&& dataHelper.stopTime() != null)
                {
                    val time= Date().time - calcRestartTime().time
                    binding.timeTv.text = timeStringFromDoubleLong(time)
                }
            }

            timer.scheduleAtFixedRate(TimeTask(), 0, 500)
        }

    override fun onPictureInPictureModeChanged(
        isInPictureInPictureMode: Boolean,
        newConfig: Configuration?
    ) {
        if (isInPictureInPictureMode){
            PIP.visibility = View.GONE
            timeTv.visibility = View.VISIBLE
            startButton. visibility = View.GONE
            resetButton.visibility = View.GONE
        }
    }





    private inner class TimeTask: TimerTask()
    {
        override fun run() {
            if (dataHelper.timerCounting())
            {
                val time = Date().time - dataHelper.startTime()!!.time
                binding.timeTv.text = timeStringFromDoubleLong(time)
            }
        }
    }





    private fun resetAction() {
        dataHelper.setStopTime(null)
        dataHelper.setStartTime(null)
        stopTimer()
        binding.timeTv.text = timeStringFromDoubleLong(0)
    }



    private fun stopTimer() {
        dataHelper.setTimerCounting(false)
        binding.startButton.text = getString(R.string.start)
    }
    private fun startTimer() {
        dataHelper.setTimerCounting(true)
        binding.startButton.text = getString(R.string.stop)
    }

    private fun startStopAction() {
        if (dataHelper.timerCounting())
        {
            dataHelper.setStopTime(Date())
            stopTimer()
        }
        else{
            if(dataHelper.stopTime() !=null)
            {
                dataHelper.setStartTime(calcRestartTime())
                dataHelper.setStopTime(null)
            }
            else{
                dataHelper.setStartTime(Date())
            }
            startTimer()
        }
    }

    private fun calcRestartTime(): Date
    {
        val diff = dataHelper.startTime()!!.time - dataHelper.stopTime()!!.time
        return Date(System.currentTimeMillis() + diff)
    }


    private fun timeStringFromDoubleLong(ms: Long):String
    {
        val seconds = (ms / 1000) % 60
        val minutes = ((ms / 1000 * 60) % 60)
        val hours = ((ms / 1000 * 60 *60) % 24)

        return makeTimeString(hours, minutes, seconds)
    }

    private fun makeTimeString(hours: Long, minutes: Long, seconds: Long): String
    {
        return String.format("%02d:%02d:%02d", hours, minutes, seconds)
    }


}








`








.xml




<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
    tools:context=".MainActivity"
    android:background="#88DEFB">

    <Button
        android:id="@+id/PIP"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="PIP"
        android:textSize="30sp" />


    <TextView
        android:id="@+id/timeTv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:padding="10dp"
        android:text="@string/place_holder_time"
        android:textAlignment="center"
        android:textColor="@color/black"
        android:textSize="60sp" />

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="10dp"
        >

        <Button
            android:id="@+id/startButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="72dp"
            android:layout_marginLeft="72dp"
            android:text="@string/start"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <Button
            android:id="@+id/resetButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/reset"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@+id/startButton"
            app:layout_constraintTop_toTopOf="parent" />
    </androidx.constraintlayout.widget.ConstraintLayout>

</LinearLayout>