https://yatmanwong.medium.com/android-how-to-pan-the-page-up-more-25fc5c542a97

AndroidBug5497Workaround.kt

import android.R
import android.app.Activity
import android.graphics.Rect
import android.view.View
import android.view.ViewTreeObserver
import android.widget.FrameLayout

class AndroidBug5497Workaround private constructor(activity: Activity) {
    private val mChildOfContent: View
    private var usableHeightPrevious = 0
    private val frameLayoutParams: FrameLayout.LayoutParams

    init {
        val content = activity.findViewById<View?>(R.id.content) as FrameLayout
        mChildOfContent = content.getChildAt(0)
        mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(object : ViewTreeObserver.OnGlobalLayoutListener {
            override fun onGlobalLayout() {
                possiblyResizeChildOfContent()
            }
        })
        frameLayoutParams = mChildOfContent.layoutParams as FrameLayout.LayoutParams
    }

    private fun possiblyResizeChildOfContent() {
        val usableHeightNow = computeUsableHeight()
        if (usableHeightNow != usableHeightPrevious) {
            val usableHeightSansKeyboard = mChildOfContent.getRootView().height
            val heightDifference = usableHeightSansKeyboard - usableHeightNow
            if (heightDifference > (usableHeightSansKeyboard / 4)) {
                // keyboard probably just became visible
                frameLayoutParams.height = usableHeightSansKeyboard - heightDifference
            } else {
                // keyboard probably just became hidden
                frameLayoutParams.height = usableHeightSansKeyboard
            }
            mChildOfContent.requestLayout()
            usableHeightPrevious = usableHeightNow
        }
    }

    private fun computeUsableHeight(): Int {
        val r = Rect()
        mChildOfContent.getWindowVisibleDisplayFrame(r)
        return (r.bottom - r.top)
    }

    companion object {
        // For more information, see https://code.google.com/p/android/issues/detail?id=5497
        // To use this class, simply invoke assistActivity() on an Activity that already has its content view set.
        fun assistActivity(activity: Activity) {
            AndroidBug5497Workaround(activity)
        }
    }
}