StackExpandableView

A custom view that resembles the iOS notification group behavior

Requirements

• A project configured with the AndroidX
• SDK 16 and and higher

Install

Download via Gradle:

Add this to the project build.gradle file:

allprojects {
    repositories {
        ...
        maven { url "https://jitpack.io" }
    }
}

And then add the dependency to the module build.gradle file:

dependencies {
        implementation 'com.github.fabiosassu:StackExpandableView:latest_version'
}

Where the latest_version is the value from Download badge.

Usage

Simple usage

All you need to do is to define a StackExpandableView item inside your layout:

 <it.fabiosassu.stackexpandableview.StackExpandableView
            android:id="@+id/horizontalStack"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:orientation="horizontal"
            app:animationDuration="1000"
            app:shownElements="5"
            app:parallaxOffset="8dp"/>

You can customize some aspects of this view:

• the orientation parameter is be used to specify the direction of the expansion It can be either vertical or horizontal. By default is vertical.
• the animationDuration parameter is used to define the duration of the animation in milliseconds. By default, is 300 milliseconds.
• the shownElements parameter is used to define how many elements we want to be shown. By default, is 3 elements.
• the parallaxOffset parameter is used to define the spacing betwen the underlying objects in dp. By default, is 8dp.

At runtime, you can set/add/remove a list of Views using the related methods

// this is used to set the list of Views
binding.horizontalStack.setWidgets(listOf<LinearLayout>())
// this is used to add a View to the existing one
binding.verticalStack.addWidget(LinearLayout(context))
// this is used to remove a View from the stack
binding.verticalStack.removeWidget(LinearLayout(context))

It is important that all the views that are added to the StackExpandableView have an id set (fo example using ViewCompat.generateViewId()), because it is used to order the views internally and also to look for the view when removeWidget() is called.