Source link: https://github.com/Karumi/ExpandableSelector


ExpandableSelector is an Android library created to show a list of Button/ImageButton widgets inside a animated container which can be collapsed or expanded.



To use ExpandableSelector in your application you have to follow this steps:

  • 1 - Add ExpandableSelector to your layout:



  • 2 - During your Activity/Fragment creation lifecycle create a list of ExpandableItem instances and configure them to be used inside your ExpandableSelector widget:
private void initializeSizesExpandableSelector() {

  ExpandableSelector sizesExpandableSelector = (ExpandableSelector) findViewById(R.id.es_sizes);

  List<ExpandableItem> expandableItems = new ArrayList<ExpandableItem>();

  expandableItems.add(new ExpandableItem("XL"));

  expandableItems.add(new ExpandableItem("L"));

  expandableItems.add(new ExpandableItem("M"));

  expandableItems.add(new ExpandableItem("S"));

  • 3 - To be able to listen the animation events configure a ExpandableSelectorListener instance:
private void configureExpandableSelectorListener() {

sizesExpandableSelector.setExpandableSelectorListener(new ExpandableSelectorListener() {

  @Override public void onCollapse() {

 //Do something here


@Override public void onExpand() {

 //Do something here


@Override public void onCollapsed() {

 //Do something here


@Override public void onExpanded() {

 //Do something here


  • 4 - To be able to listen the click events configure a OnExpandableItemClickListener instance:
private void configureExpandableSelectorClickListener() {

sizesExpandableSelector.setOnExpandableItemClickListener(new OnExpandableItemClickListener() {

  @Override public void onExpandableItemClickListener(int index, View view) {

  //Do something here




You can easily customize the appearance of your ExpandableItem instances. Just asign a value to expandableItemSyle attribute in your theme and make it reference a custom style.

<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
  <item name="expandableItemStyle">@style/ExpandableItemStyle</item> </style>  <style name="ExpandableItemStyle">
  <item name="android:layout_height">@dimen/item_size</item>
  <item name="android:layout_width">@dimen/item_size</item>
  <item name="android:background">@drawable/bg_item_with_title</item>
  <item name="android:layout_margin">@dimen/item_margin</item>
  <item name="android:textColor">@color/gray</item>
  <item name="android:textSize">@dimen/item_text_size</item> </style> 

Remember that declaring a ExpandableItemStyle as described before with the layout height and width is mandatory to avoid inflation errors.

The resources you can show in the Button/ImageButton widgets automatically added to ExpandableSelector are:

  • Background resource identifier configured as Button/ImageButton background.
  • Resource identifier configured as ImageButton image source.
  • Title configured as Button text.

All this information will be provided to the ExpandableSelector inside a List<ExpandableItem> object created by the library user.

Some extra configuration parameters can be provided from the XML like styleable attributes:











The attributes you can configure are:

  • expandable_selector:hide_background_if_collapsed: Changes the background associated to the ExpandableSelector widget to a transparent one while the widget is collapsed.
  • expandable_selector:hide_first_item_on_collapse: Changes the first item visibility to View.INVISIBLE when the ExpandableSelector is collapsed.
  • expandable_selector:expand_interpolator: Changes the interpolator used in the expand animation (applies to the items), you can use an interpolator available in the platform, or create your own.
  • expandable_selector:collapse_interpolator: Changes the interpolator used in the collapse animation (applies to the items).
  • expandable_selector:container_interpolator: Changes the interpolator used in the expand & collapse animation (applies to the container)
  • expandable_selector:animation_duration: Changes the animation duration in milliseconds to the one indicated.

Add it to your project

Add ExpandableSelector dependency to your build.gradle file


  compile 'com.karumi:expandableselector:1.0.0' 

or to your pom.xml if you are using Maven instead of Gradle

  <type>aar</type> </dependency> 

Do you want to contribute?

Please, do it! We'd like to improve this library with your help :)


Copyright 2015 Karumi  Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License. You may obtain a copy of the License at
  http://www.apache.org/licenses/LICENSE-2.0  Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. 


Jams is a free, powerful and elegant music player for Android.


  • Unofficial Google Play Music support.
  • ID3v3 tag editing.
  • Custom libraries support.
  • Album artist sorting/tag support
  • Blacklist ability for artists, album artists, albums, songs, genres and playlists.
  • 9 band equalizer with bass boost, virtualizer, and reverb.
  • Individual EQ settings for each artist, album artist, album, song, genre, or playlist.
  • File/folder browsing.
  • Scrobbling.
  • Crossfade with customizable duration.
  • Auto-download album art from the internet.
  • 2 different base themes and 9 different color schemes.

A lightweight Android library for use iconic fonts.

Realm is a mobile database that runs directly inside phones, tablets or wearables.


  • Mobile-first: Realm is the first database built from the ground up to run directly inside phones, tablets and wearables.
  • Simple: Data is directly exposed as objects and queryable by code, removing the need for ORM's riddled with performance & maintenance issues.
  • Modern: Realm supports easy thread-safety, relationships & encryption.
  • Fast: Realm is faster than even raw SQLite on common operations, while maintaining an extremely rich feature set.

Useful library for selecting images and videos from sd-card. The library can be used to display images & videos in file view or folder view. File view shows all files whereas Folder view shows files categorized. All items are sorted according to date-time with latest item showing first.

Gmail like pull to refresh implementation.

You can see Teleport as an Android Wear "plugin" you can add to your Activities and Services.

Teleport provides you commodity classes to easily establish a communication between a mobile handheld device and an Android Wear device.


2D Engines   3D Engines   9-Patch   Action Bars   Activities   ADB   Advertisements   Analytics   Animations   ANR   AOP   API   APK   APT   Architecture   Audio   Autocomplete   Background Processing   Backward Compatibility   Badges   Bar Codes   Benchmarking   Bitmaps   Bluetooth   Blur Effects   Bread Crumbs   BRMS   Browser Extensions   Build Systems   Bundles   Buttons   Caching   Camera   Canvas   Cards   Carousels   Changelog   Checkboxes   Cloud Storages   Color Analysis   Color Pickers   Colors   Comet/Push   Compass Sensors   Conferences   Content Providers   Continuous Integration   Crash Reports   Credit Cards   Credits   CSV   Curl/Flip   Data Binding   Data Generators   Data Structures   Database   Database Browsers   Date &   Debugging   Decompilers   Deep Links   Dependency Injections   Design   Design Patterns   Dex   Dialogs   Distributed Computing   Distribution Platforms   Download Managers   Drawables   Emoji   Emulators   EPUB   Equalizers &   Event Buses   Exception Handling   Face Recognition   Feedback &   File System   File/Directory   Fingerprint   Floating Action   Fonts   Forms   Fragments   FRP   FSM   Functional Programming   Gamepads   Games   Geocaching   Gestures   GIF   Glow Pad   Gradle Plugins   Graphics   Grid Views   Highlighting   HTML   HTTP Mocking   Icons   IDE   IDE Plugins   Image Croppers   Image Loaders   Image Pickers   Image Processing   Image Views   Instrumentation   Intents   Job Schedulers   JSON   Keyboard   Kotlin   Layouts   Library Demos   List View   List Views   Localization   Location   Lock Patterns   Logcat   Logging   Mails   Maps   Markdown   Mathematics   Maven Plugins   MBaaS   Media   Menus   Messaging   MIME   Mobile Web   Native Image   Navigation   NDK   Networking   NFC   NoSQL   Number Pickers   OAuth   Object Mocking   OCR Engines   OpenGL   ORM   Other Pickers   Parallax List   Parcelables   Particle Systems   Password Inputs   PDF   Permissions   Physics Engines   Platforms   Plugin Frameworks   Preferences   Progress Indicators   ProGuard   Properties   Protocol Buffer   Pull To   Purchases   Push/Pull   QR Codes   Quick Return   Radio Buttons   Range Bars   Ratings   Recycler Views   Resources   REST   Ripple Effects   RSS   Screenshots   Scripting   Scroll Views   SDK   Search Inputs   Security   Sensors   Services   Showcase Views   Signatures   Sliding Panels   Snackbars   SOAP   Social Networks   Spannable   Spinners   Splash Screens   SSH   Static Analysis   Status Bars   Styling   SVG   System   Tags   Task Managers   TDD &   Template Engines   Testing   Testing Tools   Text Formatting   Text Views   Text Watchers   Text-to   Toasts   Toolkits For   Tools   Tooltips   Trainings   TV   Twitter   Updaters   USB   User Stories   Utils   Validation   Video   View Adapters   View Pagers   Views   Watch Face   Wearable Data   Wearables   Weather   Web Tools   Web Views   WebRTC   WebSockets   Wheel Widgets   Wi-Fi   Widgets   Windows   Wizards   XML   XMPP   YAML   ZIP Codes