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Code Quality Rank: L4
Programming language: Java
License: Apache License 2.0
Tags: Other Widget    
Latest version: v1.1.0

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README

Karumi logo ExpandableSelector Build Status Maven Central Android Arsenal

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

Screenshots

[Demo Screenshot][1]

Usage

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

  • 1 - Add ExpandableSelector to your layout:

 <com.karumi.expandableselector.ExpandableSelector
      android:id="@+id/es_sizes"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"/>
  • 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"));
    sizesExpandableSelector.showExpandableItems(expandableItems);
}
  • 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
          }
        });
}

Customization

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:


  <com.karumi.expandableselector.ExpandableSelector
      xmlns:expandable_selector="http://schemas.android.com/apk/res-auto"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      expandable_selector:hide_background_if_collapsed="true"
      expandable_selector:hide_first_item_on_collapse="true"
      expandable_selector:expand_interpolator="@android:anim/accelerate_interpolator"
      expandable_selector:collapse_interpolator="@android:anim/decelerate_interpolator"
      expandable_selector:container_interpolator="@android:anim/accelerate_decelerate_interpolator"
      expandable_selector:animation_duration="100">

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


dependencies{
    compile 'com.karumi:expandableselector:1.0.0'
}

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


<dependency>
    <groupId>com.karumi</groupId>
    <artifactId>expandableselector</artifactId>
    <version>1.0.0</version>
    <type>aar</type>
</dependency>

Do you want to contribute?

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

License

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.


*Note that all licence references and agreements mentioned in the ExpandableSelector README section above are relevant to that project's source code only.