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


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


Demo Screenshot


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 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>

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


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


Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
See the License for the specific language governing permissions and
limitations under the License.
  •  Binary XML file line #18: You must supply a layout_width attribute.

    Binary XML file line #18: You must supply a layout_width attribute.

    Hi, I just copied from your instruction and then compiled. I've got some error message like this below

    Caused by: java.lang.UnsupportedOperationException: Binary XML file line #18: You must supply a layout_width attribute. at android.content.res.TypedArray.getLayoutDimension(TypedArray.java:709) at android.view.ViewGroup$LayoutParams.setBaseAttributes(ViewGroup.java:6889) at android.view.ViewGroup$MarginLayoutParams.(ViewGroup.java:7071) at android.widget.FrameLayout$LayoutParams.(FrameLayout.java:446) at android.widget.FrameLayout.generateLayoutParams(FrameLayout.java:386) at android.widget.FrameLayout.generateLayoutParams(FrameLayout.java:385) at android.view.LayoutInflater.inflate(LayoutInflater.java:502) at android.view.LayoutInflater.inflate(LayoutInflater.java:423)  at com.karumi.expandableselector.ExpandableSelector.initializeButton(ExpandableSelector.java:277)  at com.karumi.expandableselector.ExpandableSelector.renderExpandableItems(ExpandableSelector.java:231)  at com.karumi.expandableselector.ExpandableSelector.showExpandableItems(ExpandableSelector.java:92)  at indie.kcalulator.ListsActivity.initializeSizesExpandableSelector(ListsActivity.java:84)  at indie.kcalulator.ListsActivity.onCreate(ListsActivity.java:69)  at android.app.Activity.performCreate(Activity.java:6237)  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)  at android.app.ActivityThread.-wrap11(ActivityThread.java)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)  at android.os.Handler.dispatchMessage(Handler.java:102)  at android.os.Looper.loop(Looper.java:148)  at android.app.ActivityThread.main(ActivityThread.java:5417)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 

    Could you tell me how do I fix this because this error message told me that your code is not declare a layout_width attribute on android view.

    I suppose that tools:ignore="RequiredSize" in expandable_item_button layout doesn't work

    Thanks in advance.

    opened by rachanon 13
  • namespace expandable_selector

    namespace expandable_selector

    Hi everyone! I can access to expandable_selector namespace from the library sample. However, the same sample used in on a new project is not working as expected. Importing the library using gradle instructions, this namespace is inaccesible.

    opened by jrodriguezpuigvert 8
  • Custom interpolators by resource Id

    Custom interpolators by resource Id

    I have added the ability to choose custom interpolators (from the platform or defined by the user). If no interpolator is defined, the library uses the ones you guys have chosen as default.

    Do you want me to edit the sample?

    opened by aconsuegra 5
  • Update README.md with a layout style configuration disclaimer to fix #7 and #8

    Update README.md with a layout style configuration disclaimer to fix #7 and #8

    As some of our users are facing some problems related to the project configuration and the expandable item style I've added a bold disclaimer to clarify how to use this library. Fix #7 #8

    opened by pedrovgs 0
  • Error:Execution failed for task ':app:processDebugManifest'.

    Error:Execution failed for task ':app:processDebugManifest'.

    Error:Execution failed for task ':app:processDebugManifest'.

    Manifest merger failed : uses-sdk:minSdkVersion 11 cannot be smaller than version 14 declared in library [com.karumi:expandableselector:1.0.0] ...Mosaic... \app\build\intermediates\exploded-aar\com.karumi\expandableselector\1.0.0\AndroidManifest.xml Suggestion: use tools:overrideLibrary="com.karumi.expandableselector" to force usage

    opened by mrzhqiang 0
  • how can i modify your ExpandableItem name?

    how can i modify your ExpandableItem name?

    how can i modify your ExpandableItem name when i open weiget? i use code below this line: es_selector.setExpandableSelectorListener(new ExpandableSelectorListener() { @Override public void onCollapse() { Logger.e("ware"," adadad" ); es_selector.getExpandableItem(0).setResourceId(R.string.choose_type); }

            public void onExpand()
                Logger.e("ware"," adadad" );
            public void onCollapsed()
            {Logger.e("ware"," adadad" );
            public void onExpanded()
            {Logger.e("ware"," adadad" );

    i can see Log message but the ExpandableItem name didn't modifed,if you have spare times,tell me please!

    opened by kscMaster 0
  • Curve



    First to tell you thanks for your great library. Just yesterday I made similar thing in a project of mine, but yours is almost complete.

    As I saw you will like to include directions (down,left,up and right) which is great. I think the library will be great if there is also a curve expanding/collapsing involved. I would like to contribute and make an PR with this functionality.

    So my question is this:

    Do you thing this is good idea to add to the library? (I don't want to waste my time)

    opened by geftimov 1
  • Add support to expand/collapse the widget in different directions.

    Add support to expand/collapse the widget in different directions.

    In order to improve the library usage we have to add a new capability to the library, to be able to configure the expand/collapse direction from the layout configuration.

    opened by pedrovgs 0
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