App: defaultNavHost="true"

<androidx.fragment.app.FragmentContainerView
android:id="@+id/fragment_container"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:navGraph="@navigation/nav_one"
app:defaultNavHost="true"/>

Bunda app:defaultNavHost="true"/> bo’lmasa onBackPressed()qilinganda appdan chiqib ketadi ya’ni onBackPressed() ishlamaydi shuning uchun true bo’lishi shart.

android:name="androidx.navigation.fragment.NavHostFragment" bu shunday bo’lishi kerak bo’lmasa ishlamaydi!!!.

android:id="@+id/fragment_container" id berilishi shart bo’lmasa umuman ishlamaydi.

Button_id.setOnClickListener {
Navigation.findNavController(view).navigate(R.id.action_blankFragment_to_blankFragment2)
}

Button_id = Button idsi

Bu fragment ichiga yoziladi Navigation. findNavController(view).navigate(R.id…bu yerga navgraphda berilgan action bo’lishi kerak) view o’rnida this yoki contextga o’xshagan narsa.

binding!!.toolbar.setNavigationOnClickListener {

Navigation.findNavController(requireView()).navigateUp()
}

onBackPressed (ya’ni orqaga qaytish uchun) Fragment navigationda shu ishlatiladi.!!!

var window : Window = window

window.navigationBarColor = getColor(R.color.blue)

navigationBar yoki actionbarni rangini o’zgartirish uchun

binding!!.vp2.clipToPadding = false

binding!!.vp2.clipChildren = false

binding!!.vp2.offscreenPageLimit = 1

binding!!.vp2.adapter = adapter

binding!!.vp2.orientation = ViewPager2.ORIENTATION_HORIZONTAL

val transformer = CompositePageTransformer()
transformer.addTransformer(MarginPageTransformer(8))

binding!!.vp2.setPageTransformer(transformer)

<androidx.viewpager2.widget.ViewPager2
android:id="@+id/vp2"
android:layout_width="match_parent"
android:layout_height="321dp"
android:paddingStart="51dp"
android:paddingEnd="51dp"/>