How to hide bottom nav bar in fragment

Issue

I have bottom nav bar define in the Main activity. I have three fragments linked with BottomNavigation bar in fragments I have recycler view so I want to hide BottomNavigation bar when RecyclerView scrolls down and shows when RecyclerView scrolls up.
My problem is how can I access BottomNavigation bar in fragments because it is defined in MainActivity.

This is my code:

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 
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"
tools:context=".MainActivity">

<android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/AppTheme.AppBarOverlay"
    app:elevation="0dp"
    android:background="@color/colorPrimary"
    android:paddingBottom="7dp"
    android:fitsSystemWindows="true">


    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:popupTheme="@style/AppTheme.PopupOverlay"
        app:layout_scrollFlags="scroll|enterAlways|snap">

        <Spinner
            android:layout_width="110dp"
            android:layout_height="50dp"
            android:id="@+id/chooseLocation"
            app:backgroundTint="@android:color/white"/>

    </android.support.v7.widget.Toolbar>

    <EditText
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:layout_marginLeft="16dp"
        android:layout_marginRight="16dp"
        android:id="@+id/search"
        android:paddingTop="6dp"
        android:paddingBottom="6dp"
        android:paddingRight="6dp"
        android:paddingLeft="12dp"
        android:hint="Search here"
        android:textColorHint="#9e9e9e"
        android:textColor="#000"
        tools:ignore="HardcodedText"
        android:background="@drawable/search_edit_text"
        android:paddingEnd="6dp"
        android:paddingStart="12dp"/>

</android.support.design.widget.AppBarLayout>

<include layout="@layout/content_main" />

<android.support.design.widget.BottomNavigationView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/bottomBar"
    android:layout_gravity="bottom"
    app:menu="@menu/bottom_menu"
    android:background="#fff"
    app:itemIconTint="@drawable/nav_check"
    app:itemTextColor="@drawable/nav_check"/>

</android.support.design.widget.CoordinatorLayout>

fragment_home.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Tab1Fragment"
android:background="#fff">

<android.support.v7.widget.RecyclerView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/purchasedBook"/>


</RelativeLayout>

This is how my fragments are defined as there is no bottom nav bar in any fragments so how can I access bottom nav bar in fragments.

Someone, please let me know any help would be appreciated.

THANKS

Solution

To access your BottomNavigationView from within the fragments use the following code:

BottomNavigationView navBar = getActivity().findViewById(R.id.bottomBar);

Answered By – bautista

This Answer collected from stackoverflow, is licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0

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