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How can I remove the Hamburger icon from my NavigationView when I go to another fragment and then change it to a "back" icon? //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

I've been adding the following codes so they can replace that hamburger icon with the return icon:

navigation.menu.getItem(1).setOnMenuItemClickListener() //I miss an error
 toogle.isDrawerIndicatorEnabled = false

 

navigation.menu.getItem(1).setOnMenuItemClickListener 
 supportActionBar?.setHomeButtonEnabled(true)
 supportActionBar?.setDisplayHomeAsUpEnabled(true)
 supportActionBar?.setHomeAsUpIndicator(R.drawable.ic_return) //I miss an error
 

navigation.menu.getItem(2).setOnMenuItemClickListener 
 supportActionBar?.setHomeButtonEnabled(true)
 supportActionBar?.setDisplayHomeAsUpEnabled(true)
 supportActionBar?.setHomeAsUpIndicator(R.drawable.ic_return) //I miss an error
 

navigation.menu.getItem(3).setOnMenuItemClickListener 
 supportActionBar?.setHomeButtonEnabled(true)
 supportActionBar?.setDisplayHomeAsUpEnabled(true)
 supportActionBar?.setHomeAsUpIndicator(R.drawable.ic_return) //I miss an error
 

NavigationActivity.kt:

package com.example.gonzalo.proyecto_android_2018.activities

import android.support.v4.app.Fragment
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.support.design.widget.NavigationView
import android.support.v4.view.GravityCompat
import android.support.v7.app.ActionBarDrawerToggle
import android.support.v7.widget.Toolbar
import android.view.MenuItem
import com.example.gonzalo.proyecto_android_2018.R
import com.example.gonzalo.proyecto_android_2018.fragments.*
import kotlinx.android.synthetic.main.activity_navigation.*

class NavigationActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelectedListener

lateinit var tb:Toolbar

override fun onCreate(savedInstanceState: Bundle?) 
 super.onCreate(savedInstanceState)
 setContentView(R.layout.activity_navigation)

 //SETUP TOOLBAR
 tb = toolbar as Toolbar
 //tb.title = "LIGHT BUS"

 //SETUP NAVIGATIONVIEW
 setupNavigation()

 setupFragment(HomeFragment())

 navigation.menu.getItem(0).isChecked = true


private fun setupNavigation() 

 //THERE IS NO TOGY CLASS, I SAY IT NOT TO BE CONFUSED WITH THE VARIABLE "toogle"
 val toogle = ActionBarDrawerToggle(this, drawer, tb, R.string.drawerAbierto, R.string.drawerCerrado)

 toogle.isDrawerIndicatorEnabled = true //HERE I SAY THAT THE SANDWICHITO SYMBOL APPEARS TO OPEN AND CLOSE THE NAVIGATIONVIEW

 drawer.addDrawerListener(toogle)
 toogle.syncState() //HERE I SAY TO SYNCHRONIZE THE STATE OPEN OR CLOSED. EXAMPLE, MUST CLOSE WHEN OPEN AND MUST BE OPEN WHEN CLOSED

 navigation.setNavigationItemSelectedListener(this) //HERE I SAY TO THIS NAVIGATION (navigation) THAT IT WILL BE ALREADY ADDED WITHIN NAVIGATION ACTIVITY


private fun setupFragment(fragment: Fragment) //Replace the "R.id.frameLayout" with the id of the "fragment" that will be placed in the "activity_navigation.xml"
 supportFragmentManager.beginTransaction().replace(R.id.frameLayout, fragment).commit()


override fun onNavigationItemSelected(item: MenuItem): Boolean 
 when(item.itemId)
 R.id.home -> setupFragment(HomeFragment())
 R.id.mi_cuenta -> setupFragment(MiCuentaFragment())
 R.id.pagos -> setupFragment(PagosFragment())
 R.id.promociones -> setupFragment(PromocionesFragment())
 R.id.regalo_amigo -> setupFragment(RegaloAmigoFragment())
 R.id.ayuda -> setupFragment(AyudaFragment())
 
 drawer.closeDrawer(GravityCompat.START) //HERE I SAY, AFTER YOU HAVE CHANGED FRAGMENT, CLOSE THE DRAWER
 return true


override fun onBackPressed() 
 if(drawer.isDrawerOpen(GravityCompat.START))
 drawer.closeDrawer(GravityCompat.START)
 

 else
 super.onBackPressed()
 

activity_navigation.xml:

<?xml version="1.0" encoding="utf-8"?>

<android.support.v4.widget.DrawerLayout
android:id="@+id/drawer"
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
>

<android.support.constraint.ConstraintLayout
 android:layout_width="match_parent"
 android:layout_height="match_parent">

 <include
 android:id="@+id/toolbar"
 layout="@layout/toolbar"/>

 <FrameLayout
 android:id="@+id/frameLayout"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:layout_marginTop="?attr/actionBarSize">

 </FrameLayout>

</android.support.constraint.ConstraintLayout>

<android.support.design.widget.NavigationView
 android:id="@+id/navigation"
 app:itemTextColor="#009688"
 app:menu="@menu/main_menu"
 app:headerLayout="@layout/nav_header"
 android:fitsSystemWindows="true"
 android:layout_gravity = "start"
 android:layout_width="wrap_content"
 android:layout_height="match_parent"/>

</android.support.v4.widget.DrawerLayout>