don't show text on api 23

[karimi12]

i have a strange problem :
i have button in a activity and a function for onClick event

fun sendComment(view: View): Unit {

    Sneaker.with(this) // Activity, Fragment or ViewGroup
            .setTitle("Warning!!")
            .setMessage("This is the warning message")
            .sneakWarning()

    Toast.makeText(this,"show",Toast.LENGTH_LONG).show()
}

Toast show correct but Sneaker don't show!!

but i have a other Sneaker on onCreate activity function It is displayed correctly

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_contact)
        val typeface= Typeface.createFromAsset(assets,getString(R.string.font_path))
        _tv_name.typeface = typeface
        _tv_phone_number.typeface = typeface
        _tv_comment.typeface = typeface
        _tl_comment.typeface = typeface
        _tl_phone_number.typeface = typeface
        _tl_name.typeface = typeface

        Sneaker.with(this) // Activity, Fragment or ViewGroup
                .setTitle("Warning!!")
                .setMessage("This is the warning message")
                .sneakWarning()
       }

i test it on genymotion samsung S7 and Samsung S5