Qanday qilib tugmalar yordamida navigatsiyani amalga…

Navigation Architecture Component ni foydalanardim.

NavGraph yaratish: Destinations (fragmentlar yoki Activitylar) va Actions (ular orasidagi o'tishlar) XML-resursda belgilardim.

<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/nav_graph"
    app:startDestination="@id/fragmentA"> // Boshlang'ich nuqta

    <fragment
        android:id="@+id/fragmentA"
        android:name="com.example.FragmentA"
        android:label="FragmentA" >
        <action
            android:id="@+id/action_fragmentA_to_fragmentB"
            app:destination="@id/fragmentB" />
    </fragment>
    <fragment
        android:id="@+id/fragmentB"
        android:name="com.example.FragmentB"
        android:label="FragmentB" >
        <action
            android:id="@+id/action_fragmentB_to_fragmentC"
            app:destination="@id/fragmentC" />
    </fragment>
     <fragment
        android:id="@+id/fragmentC"
        android:name="com.example.FragmentC"
        android:label="FragmentC" />
</navigation>

NavHost joylashtirish: NavHost (masalan, NavHostFragment)ni Activity maketiga qo'shardim, unga NavGraph bog'langan.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <androidx.fragment.app.FragmentContainerView
        android:id="@+id/nav_host_fragment"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        app:defaultNavHost="true"
        app:navGraph="@navigation/nav_graph" /> // NavGraph bilan bog'lash

    <!-- Bu yerda navigatsiya tugmalari bo'lishi mumkin -->
</LinearLayout>

Navigatsiya tugmalarini qo'shish: BottomNavigationView yoki alohida tugmalarni ishlatardim. BottomNavigationViewni NavControllerga bog'lagan bo'lardim.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <androidx.fragment.app.FragmentContainerView
        android:id="@+id/nav_host_fragment"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        app:defaultNavHost="true"
        app:navGraph="@navigation/nav_graph" />

    <Button
        android:id="@+id/button_go_to_b"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="B ga o'tish" />

    <Button
        android:id="@+id/button_go_to_c"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="C ga o'tish" />
</LinearLayout>

Kodda tugmalar bosilishi bilan ishlash: NavController nusxasini olardim va navigate() chaqirardim. NavController avtomatik ravishda back stackni boshqaradi, oldingi Destinationlarni saqlab qoladi.

// Activity yoki Fragmentda
import androidx.navigation.findNavController

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)

    val navController = findNavController(R.id.nav_host_fragment) // NavController olish

    view.findViewById<Button>(R.id.button_go_to_b).setOnClickListener {
        navController.navigate(R.id.action_fragmentA_to_fragmentB) // Action orqali o'tish
    }

    view.findViewById<Button>(R.id.button_go_to_c).setOnClickListener {
        // To'g'ridan-to'g'ri Destinationga o'tish, agar mavjud bo'lsa, action_fragmentA_to_fragmentC ishlatish mumkin
         navController.navigate(R.id.fragmentC)
    }
}

Ko'proq murakkab navigatsiya uchun, bir nechta tablar (BottomNavigationView, DrawerLayout) bilan, setupWithNavController() ishlatardim.

// BottomNavigationView bilan Activityda
import androidx.navigation.ui.setupWithNavController
import com.google.android.material.bottomnavigation.BottomNavigationView

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

    val navController = findNavController(R.id.nav_host_fragment)
    val bottomNavView = findViewById<BottomNavigationView>(R.id.bottom_nav_view)
    bottomNavView.setupWithNavController(navController) // BottomNavigationViewni NavControllerga bog'lash
}

Navigation Component default ravishda back stackni boshqaradi. "Orqaga" tugmasi bosilganda, foydalanuvchi oldingi destinationga qaytadi. navigate() bilan back stackni boshqarish uchun, popUpTo bilan NavOptions ishlatish mumkin.

Qanday qilib tugmalar yordamida navigatsiyani amalga oshirasiz, shunda u yiginni saqlaydi?