This gist is an example of handling Surface View in Android in Kotlin in a better way

LiveGraphPlotView.kt

class LiveGraphPlotView @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null
) : SurfaceView(context, attrs), SurfaceHolder.Callback, Runnable {

    private lateinit var mCanvas: Canvas
    private lateinit var mSurfaceHolder: SurfaceHolder
    private var mWidth: Int = 0
    private var mHeight: Int = 0
    private var mRunning: Boolean = false

    init {
        holder.addCallback(this)
    }

    override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
        super.onSizeChanged(w, h, oldw, oldh)
        mWidth = w
        mHeight = h
    }

    override fun surfaceCreated(holder: SurfaceHolder) {
        mSurfaceHolder = holder.apply {
            setFormat(PixelFormat.TRANSPARENT)
        }
        Thread(this, "thread-105").start()
        mRunning = true
    }

    override fun surfaceChanged(holder: SurfaceHolder, format: Int, width: Int, height: Int) {}

    override fun surfaceDestroyed(holder: SurfaceHolder) {
        if (::mSurfaceHolder.isInitialized && holder == mSurfaceHolder) {
            mRunning = false
        }
    }

    override fun run() {
        while (mRunning) {
            if (mSurfaceHolder.surface.isValid) {
                try {
                    mCanvas =
                        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) mSurfaceHolder.lockCanvas()
                        else mSurfaceHolder.lockHardwareCanvas()
                    mCanvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR)
                    mCanvas.save()
                    
                    // do changes to your canvas 
                    
                    mCanvas.restore()
                    mSurfaceHolder.unlockCanvasAndPost(mCanvas)
                } catch (e: Exception) {
                    OrbiLogger.e(TAG, "Exception : ${e.localizedMessage}")
                }
            }
        }
    }

    companion object {
        private val TAG = // TAG Name
    }
}