NezSpencer

        //rvList is my recyclerview
        binding.rvList.isNestedScrollingEnabled = false

NezSpencer

private fun popToFragmentBeforeKnownFragment(fragment: Fragment) {
        if (!lifecycle.currentState.isAtLeast(Lifecycle.State.STARTED))
            return
        val isPopped = supportFragmentManager.popBackStackImmediate(fragment::class.simpleName,
                FragmentManager.POP_BACK_STACK_INCLUSIVE)
        if (!isPopped)
            throw UnsupportedOperationException("Specified fragment does not exist in backstack")
    }

NezSpencer

private fun moveBackXTimes(numOfTimes : Int) {
        if (!lifecycle.currentState.isAtLeast(Lifecycle.State.STARTED))
            return

        val backStackCount = supportFragmentManager.backStackEntryCount
        if (numOfTimes >= backStackCount) {
            throw UnsupportedOperationException("Number of times specified $numOfTimes is greater" +
                    " than the backstackEntryCount")
        }

NezSpencer

private fun createArtificialBackStack() {
        if (!lifecycle.currentState.isAtLeast(Lifecycle.State.STARTED))
            return

        supportFragmentManager.beginTransaction()
                .replace(R.id.app_container, HomeFragment.newInstance(), HomeFragment::class.simpleName)
                .addToBackStack(HomeFragment::class.simpleName)
                .setReorderingAllowed(true)
                .commit()

NezSpencer

 private fun popToKnownFragment(fragment : Fragment) {
        if (!lifecycle.currentState.isAtLeast(Lifecycle.State.STARTED))
            return

        val isPopped = supportFragmentManager.popBackStackImmediate(fragment::class.simpleName, 0)
        if (!isPopped) {
            // code inside here is only executed because fragment transaction didnt happen because 
            // the fragment above does not exist in the backstack or it was added with a different tag. 
            // Since this fragment must be shown, add a new instance of it
            supportFragmentManager.beginTransaction()

NezSpencer

private fun moveBackOneTime() {
        if (!lifecycle.currentState.isAtLeast(Lifecycle.State.STARTED))
            return

        supportFragmentManager.popBackStack()
    }

NezSpencer

package com.nezspencer.test

import android.os.Bundle
import android.support.annotation.NonNull
import android.support.v7.app.AppCompatActivity
import android.text.Editable
import android.text.TextUtils
import android.text.TextWatcher
import android.widget.EditText
import java.text.NumberFormat

NezSpencer

private fun getNewCursorPosition(digitCountToRightOfCursor : Int, numberString : String) : Int{
        var position = 0
        var c = digitCountToRightOfCursor
        for (i in numberString.reversed()) {
            if (c == 0)
                break

            if (i.isDigit())
                c --
            position ++

NezSpencer

override fun onSuccess(){
        if(lifecycle.currentState.isAtLeast(Lifecycle.State.STARTED)) {
            //safe to perform fragment transaction
        }

    }

NezSpencer

@Override
    fun onSuccess(){
        if(lifecycle.currentState.isAtLeast(Lifecycle.State.STARTED)) {
            //perform action here
        }

    }