[Android/Kotlin] Make Toolbar's title scrollable

MainActivity.kt

import android.os.Bundle
import android.text.TextUtils
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import androidx.appcompat.widget.Toolbar

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        //make toolbar's title scrollable
        getTitleTextView(mToolbar)?.let { tV ->
            tV.isSelected = true
            tV.setHorizontallyScrolling(true)
            tV.ellipsize = TextUtils.TruncateAt.MARQUEE

            //https://developer.android.com/reference/android/widget/TextView.html#setMarqueeRepeatLimit(int)
            tV.marqueeRepeatLimit = -1
        }
    }

    //from: https://stackoverflow.com/a/38241603
    private fun getTitleTextView(toolbar: Toolbar): TextView? {
        return try {
            val toolbarClass = Toolbar::class.java
            val titleTextViewField = toolbarClass.getDeclaredField("mTitleTextView")
            titleTextViewField.isAccessible = true
            titleTextViewField.get(toolbar) as TextView
        } catch (e: Exception) {
            e.printStackTrace()
            null
        }
    }
}