AnimatedBottomBar

           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

Tab appearance

Badges

Animations

Indicator

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.