AnimatedBottomBar

A customizable and easy to use BottomBar navigation view with sleek animations, with support for ViewPager, ViewPager2, NavController, and badges.

Programming language: Kotlin

License: MIT License

Tags: Kotlin     UI     Animations     Navigation     Android-library     BottomBar     BottomNavigationBar    

Latest version: v1.0.9

README

AnimatedBottomBar A customizable and easy to use BottomBar navigation view with sleek animations, with support for ViewPager, ViewPager2, NavController, and badges.

           By Joery Droppers

Screenshots

Playground app

Download the playground app from Google Play, with this app you can try out all features and even generate XML with your selected configuration.

Contents

• Getting started
• Managing tabs
• Usage with ViewPager
• Configuration

Getting started

This library is available on Maven Central, install it by adding the following dependency to your build.gradle:

implementation 'nl.joery.animatedbottombar:library:1.1.0'

Versions 1.0.x can only be used with jCenter, versions 1.1.x and up can be used with Maven Central.

Define AnimatedBottomBar in your XML layout with custom attributes.

<nl.joery.animatedbottombar.AnimatedBottomBar
    android:id="@+id/bottom_bar"
    android:background="#FFF"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:abb_selectedTabType="text"
    app:abb_indicatorAppearance="round"
    app:abb_indicatorMargin="16dp"
    app:abb_indicatorHeight="4dp"
    app:abb_tabs="@menu/tabs"
    app:abb_selectedIndex="1" />

Create a file named tabs.xml in the res/menu/ resources folder:

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/tab_home"
        android:icon="@drawable/home"
        android:title="@string/home" />
    <item
        android:id="@+id/tab_alarm"
        android:icon="@drawable/alarm"
        android:title="@string/alarm" />
    <item
        android:id="@+id/tab_bread"
        android:icon="@drawable/bread"
        android:title="@string/bread" />
    <item
        android:id="@+id/tab_cart"
        android:icon="@drawable/cart"
        android:title="@string/cart" />
</menu>

Get notified when the selected tab changes by setting callbacks:

bottom_bar.onTabSelected = {
    Log.d("bottom_bar", "Selected tab: " + it.title)
}
bottom_bar.onTabReselected = {
    Log.d("bottom_bar", "Reselected tab: " + it.title)
}

Or set a listener if you need more detailed information:

bottom_bar.setOnTabSelectListener(object : AnimatedBottomBar.OnTabSelectListener {
    override fun onTabSelected(
        lastIndex: Int,
        lastTab: AnimatedBottomBar.Tab?,
        newIndex: Int,
        newTab: AnimatedBottomBar.Tab
    ) {
        Log.d("bottom_bar", "Selected index: $newIndex, title: ${newTab.title}")
    }

    // An optional method that will be fired whenever an already selected tab has been selected again.
    override fun onTabReselected(index: Int, tab: AnimatedBottomBar.Tab) {
        Log.d("bottom_bar", "Reselected index: $index, title: ${tab.title}")
    }
})

Managing tabs

Short overview on how to manage tabs using code.

Creating new tabs

// Creating a tab by passing values
val bottomBarTab1 = AnimatedBottomBar.createTab(drawable, "Tab 1")

// Creating a tab by passing resources
val bottomBarTab2 = AnimatedBottomBar.createTab(R.drawable.ic_home, R.string.tab_2, R.id.tab_home)

Adding new tabs

// Adding a tab at the end
AnimatedBottomBar.addTab(bottomBarTab1)

// Add a tab at a specific position
AnimatedBottomBar.addTabAt(1, bottomBarTab2)

Removing tabs

// Removing a tab by object reference
val tabToRemove = AnimatedBottomBar.tabs[1]
AnimatedBottomBar.removeTab(tabToRemove)

// Removing a tab at a specific position
AnimatedBottomBar.removeTabAt(tabPosition)

// Removing a tab by the given ID resource
AnimatedBottomBar.removeTabById(R.id.tab_home)

Selecting tabs

// Selecting a tab by object reference
val tabToSelect = AnimatedBottomBar.tabs[1]
AnimatedBottomBar.selectTab(tabToSelect)

// Selecting a tab at a specific position
AnimatedBottomBar.selectTabAt(1)

// Selecting a tab by the given ID resource
AnimatedBottomBar.selectTabById(R.id.tab_home)

Enabling / disabling tabs

// Disabling a tab by object reference
val tabToDisable = AnimatedBottomBar.tabs[1]
AnimatedBottomBar.setTabEnabled(tabToDisable, false) // Use true for re-enabling the tab

// Disabling a tab at a specific position
AnimatedBottomBar.setTabEnabledAt(1, false)

// Disabling a tab by the given ID resource
AnimatedBottomBar.setTabEnabledById(R.id.tab_home, false)

Intercepting tabs

This could be useful for example restricting access to a premium area. You can use a callback or a more detailed listener:

bottom_bar.onTabIntercepted = {
    if (newTab.id == R.id.tab_pro_feature && !hasProVersion) {
        // e.g. show a dialog
        false
    }
    true
}

Detailed listener:

bottom_bar.setOnTabInterceptListener(object : AnimatedBottomBar.OnTabInterceptListener {
    override fun onTabIntercepted(
        lastIndex: Int,
        lastTab: AnimatedBottomBar.Tab?,
        newIndex: Int,
        newTab: AnimatedBottomBar.Tab
    ): Boolean {
        if (newTab.id == R.id.tab_pro_feature && !hasProVersion) {
            // e.g. show a dialog
            return false
        }
        return true
    }
})

Tab badges

Instructions on how to set badges for tabs, a AnimatedBottomBar.Badge object should be supplied to the BottomBar, note that it is also possible to add badges without text.

Adding badges

// Adding a badge by tab reference
val tabToAddBadgeAt = AnimatedBottomBar.tabs[1]
AnimatedBottomBar.setBadgeAtTab(tabToAddBadgeAt, AnimatedBottomBar.Badge("99"))

// Adding a badge at a specific position
AnimatedBottomBar.setBadgeAtTabIndex(1, AnimatedBottomBar.Badge("99"))

// Adding a badge at the given ID resource
AnimatedBottomBar.setBadgeAtTabId(R.id.tab_home, AnimatedBottomBar.Badge("99"))

Removing badges

// Removing a badge by tab reference
val tabToRemoveBadgeFrom = AnimatedBottomBar.tabs[1]
AnimatedBottomBar.clearBadgeAtTab(tabToRemoveBadgeFrom)

// Removing a badge at a specific position
AnimatedBottomBar.clearBadgeAtTabIndex(1, AnimatedBottomBar.Badge("99"))

// removing a badge at the given ID resource
AnimatedBottomBar.clearBadgeAtTabId(R.id.tab_home, AnimatedBottomBar.Badge("99"))

Styling individual badges

Additionally there is also the possibility to individually style badges.

AnimatedBottomBar.Badge(
    text = "99",
    backgroundColor = Color.RED,
    textColor = Color.GREEN,
    textSize =  12.spPx // in pixels
)

Usage with ViewPager

It is easy to use the BottomBar with a ViewPager or ViewPager2, you can simply use the setupWithViewPager() method. Please note that the number of tabs and ViewPager pages need to be identical in order for it to function properly.

Usage

// For ViewPager use:
bottom_bar.setupWithViewPager(yourViewPager)

// For ViewPager2 use:
bottom_bar.setupWithViewPager2(yourViewPager2)

Configuration

An overview of all configuration options. All options can also be accessed and set programmatically, by their equivalent name.

Tabs

Attribute Description Default abb_tabs Tabs can be defined in a menu file (Menu resource), in the res/menu/ resource folder.The icon and title attribute are required. By default all tabs are enabled, set android:enabled to false to disable a tab. <menu xmlns:android="http://schemas.android.com/apk/res/android&#x22;&#x3E; <item android:id="@+id/tab_example" android:icon="@drawable/ic_example" android:title="@string/tab_example" android:enabled="true|false" /> ...etc </menu> abb_selectedIndex Define the default selected tab index. abb_selectedTabId Define the default selected tab by its ID, for example @id/tab_id

Tab appearance

Attribute Description Default abb_selectedTabType Determines whether the icon or text should be shown when a tab has been selected. icon text icon abb_tabColor The color of the icon or text when the tab is not selected. @color/textColorPrimary abb_tabColorSelected The color of the icon or text when the tab is selected. @color/colorPrimary abb_tabColorDisabled The color of the icon or text whenever the tab has been disabled. @color/textColorSecondary abb_textAppearance Customize the look and feel of text in tabs, down below is an example of a custom text appearance. Define a new style in res/values/styles.xml: <style name="CustomText"> <item name="android:textAllCaps">true</item> <item name="android:fontFamily">serif</item> <item name="android:textSize">16sp</item> <item name="android:textStyle">italic|bold</item> </style> abb_textStyle Style (normal, bold, italic, bold|italic) for the text. Use bottom_bar.typeface to programmatically set text style. normal abb_textSize Size of the text. Recommended dimension type for text is "sp" (scaled-pixels), for example: 14sp. 14sp abb_iconSize Increase or decrease the size of the icon. 24dp abb_rippleEnabled Enables the 'ripple' effect when selecting a tab. false abb_rippleColor Change the color of the aforementioned ripple effect. Default theme color

Badges

Attribute Description Default abb_badgeBackgroundColor The background color of the badges. #ff0c10 (red) abb_badgeTextColor The text color of the text inside the badges. #FFFFFF abb_badgeTextSize The text size of the text inside the badges. Recommended dimension type for text is "sp" (scaled-pixels), for example: 14sp. 10sp abb_badgeAnimation The enter and exit animation type for badges. none scale fade scale abb_badgeAnimationDuration The duration of the entry and exit animation of a badge. 150

Animations

Attribute Description Default abb_animationDuration The duration of all animations, including the indicator animation. 400 abb_tabAnimation The enter and exit animation style of the tabs which are not selected. none slide fade fade abb_tabAnimationSelected The enter and exit animation style of the selected tab. none slide fade slide abb_animationInterpolator The interpolator used for all animations.See "Android Interpolators: A Visual Guide" for more information on available interpolators. Example value: @android:anim/overshoot_interpolator FastOutSlowInInterpolator

Indicator

Attribute Description Default abb_indicatorColor The color of the indicator. @android/colorPrimary abb_indicatorHeight The height of the indicator. 3dp abb_indicatorMargin The horizontal margin of the indicator. This determines the width of the indicator. 0dp abb_indicatorAppearance Configure the shape of the indicator either to be square or round. invisible square round square abb_indicatorLocation Configure the location of the selected tab indicator, top, bottom or invisible. top bottom top abb_indicatorAnimation The animation type of the indicator when changing the selected tab. none slide fade slide

Featured in

• Android Weekly: Issue 404
• Medium: The 25 Best Android Libraries and Projects of 2020
• Medium: The Top 5 Trending Android Libraries From Q1 2020

Credits

• Dribble: Readable Tab Bar

License

MIT License

Copyright (c) 2021 Joery Droppers (https://github.com/Droppers)

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.