Building an Expandable Credit Card Information Card in Jetpack Compose
Creating an Interactive UI Component to Display Credit Card Details
Introduction:
In this article, we will explore how to create an expandable credit card information card using Jetpack Compose, a modern UI toolkit for building Android apps. We’ll go through the code and explain each part, allowing you to understand the implementation and customize it to suit your needs.
The CreditCardInfoCard
function is responsible for rendering the credit card information card. It defines the UI components and behavior for displaying the card details.
We initialize a mutable state variable called expanded
using the remember
function. This variable keeps track of whether the card details section is expanded or not. It allows the UI to update and recompose based on the state changes.
Next, we create an instance of the CreditCardInfo
data class, which holds the credit card information such as the card number, customer name, CVV, expiry date, and card type. For demonstration purposes, we have hardcoded sample values, but you can replace them with dynamic data.
data class CreditCardInfo(
val cardNumber: String,
val customerName: String,
val cvv: String,
val expiry: String,
val cardType: String
)
We use the Card
composable to create a rectangular card with a shadow and rounded corners. It acts as the container for the credit card information. The modifier
parameter is used to apply various modifiers to the card, such as padding, width, and background color.
Inside the Card
composable, we use a Column
composable to arrange the child composables vertically. The modifier
parameter is used to apply padding to the column, giving it spacing from the card's edges.
We apply the clickable
modifier to the Column
to make it respond to clicks. When the column is clicked, it triggers a lambda function that toggles the value of expanded
. This allows the card details section to expand or collapse based on the current state.
Within the Column
, we use the Text
composable to display the card number. The cardInfo.cardNumber
property is interpolated into the text using string template syntax.
To handle the expandable behavior, we use the AnimatedVisibility
composable. It wraps the child composables that represent the expanded card details section. The visible
parameter is bound to the value of expanded
, which determines whether the details section should be visible or hidden.
The enter
and exit
parameters of AnimatedVisibility
define the animations to be used when the card details section is shown or hidden. In this case, fade and vertical expansion/shrink animations are applied using predefined animation functions like fadeIn()
, fadeOut()
, expandVertically()
, and shrinkVertically()
.
Inside the AnimatedVisibility
composable, we have another Column
composable representing the expanded card details section. The modifier
parameter is used to add top padding to create spacing between the card number and the expanded details.
AnimatedVisibility(
visible = expanded.value,
enter = fadeIn() + expandVertically(),
exit = fadeOut() + shrinkVertically()
) {
// Content to be shown or hidden
// ...
}
- The
visible
parameter ofAnimatedVisibility
is bound to the value ofexpanded
. This means that whenexpanded
istrue
, the content insideAnimatedVisibility
will be visible, and when it'sfalse
, the content will be hidden. - The
enter
parameter defines the animation that occurs when the content becomes visible. In this case, we combine thefadeIn()
animation, which gradually fades in the content, with theexpandVertically()
animation, which expands the content vertically from its initial size to its final size. - The
exit
parameter defines the animation that occurs when the content becomes hidden. Here, we combine thefadeOut()
animation, which gradually fades out the content, with theshrinkVertically()
animation, which shrinks the content vertically from its final size to its initial size. - Inside the
AnimatedVisibility
composable, you can place the content that you want to show or hide based on thevisible
state. In the provided code, aColumn
composable is used to group and display the card details such as the customer name, CVV, expiry date, and card type.
Within the expanded Column
, we use the Text
composable to display the customer name, CVV, expiry date, and card type. The corresponding properties from cardInfo
are interpolated into the text using string template syntax.
Completed Code —
By understanding the code and its explanation, you can customize and extend this composable to suit your specific requirements for displaying credit card information in an expandable card format.