Unable to move from one fragment to another

Question

I am trying to set up an activity with a fragment with a recyclerview and a botom navigation menu. When I tap on the 'Dashboard', I can see the progress bar and it updates the data from Firestore but when I hit the Quizzes I cannot see the progress bar or new data. All I am seeing is the same data. I think it's not moving to other fragment.

As a beginner I do not know the actual working of fragments and recyclerview I am doing it with the help of people and resources available online. I couldn't figure out where the problem is. I can provide more codes if needed.

NOTE: I am not getting any error.

bottom_nav_menu.xml

    <?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@+id/navigation_dashboard"
        android:icon="@drawable/ic_vector_dashboard"
        android:title="Dashboard" />

    <item
        android:id="@+id/navigation_quizzes"
        android:icon="@drawable/ic_vector_quizzes"
        android:title="Quizzes" />

</menu>

mobile_navigation.xml

    <?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/mobile_navigation"
    app:startDestination="@+id/navigation_dashboard">

    <fragment
        android:id="@+id/navigation_dashboard"
        android:name="com.example.quiz.ui.fragments.DashboardFragment"
        android:label="@string/title_dashboard"
        tools:layout="@layout/fragment_dashboard" />

    <fragment
        android:id="@+id/navigation_quiz"
        android:name="com.example.quiz.ui.fragments.QuizFragment"
        android:label="@string/title_products"
        tools:layout="@layout/fragment_quiz" />

</navigation>

activity_dashboard.xml

    <?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/nav_view"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="0dp"
        android:layout_marginEnd="0dp"
        android:background="@drawable/app_gradient_color_background"
        app:itemIconTint="@color/colorWhite"
        app:itemTextColor="@color/colorWhite"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:menu="@menu/bottom_nav_menu" />


    <androidx.fragment.app.FragmentContainerView
        android:id="@+id/nav_host_fragment"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:defaultNavHost="true"
        app:layout_constraintBottom_toTopOf="@id/nav_view"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0"
        app:navGraph="@navigation/mobile_navigation" />


</androidx.constraintlayout.widget.ConstraintLayout>

fragment_dashboard.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    tools:context=".ui.fragments.DashboardFragment">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv_dashboard_items"
        tools:listitem="@layout/item_list_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/tv_no_dashboard_items_found"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:text="no_dashboard_item_found"
        android:textAlignment="center"
        android:textSize="20sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

fragment_quiz.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    tools:context=".ui.fragments.QuizFragment">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rvQuizzesFrag"
        tools:listitem="@layout/item_list_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/tv_no_products_found"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:text="NO QUIZZES TODAY"
        android:textAlignment="center"
        android:textSize="30sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

DashboardActivity.kt

package com.example.quiz.ui.activities

import android.os.Bundle
import androidx.core.content.ContextCompat
import androidx.navigation.findNavController
import androidx.navigation.fragment.NavHostFragment
import androidx.navigation.ui.AppBarConfiguration
import androidx.navigation.ui.setupActionBarWithNavController
import androidx.navigation.ui.setupWithNavController
import com.google.android.material.bottomnavigation.BottomNavigationView
import com.example.quiz.R

class DashboardActivity : BaseActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_dashboard)
     
        supportActionBar!!.setBackgroundDrawable(
            ContextCompat.getDrawable(
                this@DashboardActivity,
                R.drawable.app_gradient_color_background
            )
        )


        val navView: BottomNavigationView = findViewById(R.id.nav_view)

        val navHostFragment = supportFragmentManager.findFragmentById(R.id.nav_host_fragment) as NavHostFragment
        val navController = navHostFragment.navController

        val appBarConfiguration = AppBarConfiguration(
            setOf(
                R.id.navigation_quiz,
                R.id.navigation_dashboard
            )
        )
        setupActionBarWithNavController(navController, appBarConfiguration)

        navView.setupWithNavController(navController)
    }

    override fun onBackPressed() {
        doubleBackToExit()
    }
}

Can you tell me where these R.id.navigation_quiz, R.id.navigation_dashboard should be referring to? Whether to the bottom_nav_menu.xml or mobile_navigation.xml.

Answer 1

If you think it's not moving to Quiz Fragment then it might be because your BottomNavigation is not working correctly....

For bottom navigation to work correct with Nav Controller the id's of items in bottom_nav_menu.xml and moile_navigation.xml must be same

In your case the id of dashboard is same in bottom_nav_menu.xml and moile_navigation.xml but for quiz the id's are different in both of these files, it is @+id/navigation_quizzes in bottom_nav_menu.xml and in moile_navigation.xml it is @+id/navigation_quiz

Make the id's same in both files

bottom_nav_menu.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@+id/navigation_dashboard"
        android:icon="@drawable/ic_vector_dashboard"
        android:title="Dashboard" />

    <item
        android:id="@+id/navigation_quiz"
        android:icon="@drawable/ic_vector_quiz"
        android:title="Quizzes" />
</menu>

moile_navigation.xml

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/mobile_navigation"
    app:startDestination="@+id/navigation_dashboard">

    <fragment
        android:id="@+id/navigation_dashboard"
        android:name="com.example.quiz.ui.fragments.DashboardFragment"
        android:label="@string/title_dashboard"
        tools:layout="@layout/fragment_dashboard" />

    <fragment
        android:id="@+id/navigation_quiz"
        android:name="com.example.quiz.ui.fragments.QuizFragment"
        android:label="@string/title_products"
        tools:layout="@layout/fragment_quiz" />

</navigation>