How to change bottom Navigation View menu item title size in Android

In this android programming source code example, we are going to change bottom navigation view menu item title size in android.

You can copy and adopt this source code example to your android project without reinventing the wheel.

Below is a step by step source code to change bottom navigation view menu item title size in android.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:fitsSystemWindows="true">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="Bottom Navigation"
        android:gravity="center" />

    <View
        android:layout_width="match_parent"
        android:layout_height="3dp"
        android:layout_above="@id/bottom_nav"
        android:background="@drawable/shadow"/>

    <android.support.design.widget.BottomNavigationView
        android:id="@+id/bottom_nav"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_gravity="bottom"
        android:background="@android:color/white"
        app:itemBackground="@android:color/white"
        app:elevation="8dp"
        app:menu="@menu/bottombar_menu"
        app:itemTextAppearanceActive="@style/BottomNavigationView15"/>

</RelativeLayout>

res/values/styles.xml

<style name="BottomNavigationView15" parent="@android:style/TextAppearance.Medium">
        <item name="android:textSize">20sp</item>
    </style>

MainActivity.java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;


public class NavigationViewActivity15 extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_navigation_view15);
    }
}

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