Скачать или смотреть How to Change Background and Stroke Color on Click in Android RelativeLayout?

Discover effective techniques to change the background and stroke color of a `RelativeLayout` upon clicking it in Android. Learn about XML selectors and code implementations to enhance your UI!
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This video is based on the question https://stackoverflow.com/q/68013280/ asked by the user 'Gaurav Dureja' ( https://stackoverflow.com/u/13828186/ ) and on the answer https://stackoverflow.com/a/68013908/ provided by the user 'MojoJojo' ( https://stackoverflow.com/u/6076979/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Change Background and Stroke Color on Click in Android RelativeLayout?

Creating interactive user interfaces in Android involves dynamically changing elements' appearance based on user actions, such as clicks. A common requirement is changing the background and stroke color of a RelativeLayout when a user clicks on it. In this guide, we’ll dive into how to effectively accomplish this, focusing on XML selectors and Java/Kotlin code implementations.

Understanding the Problem

When you set up a RelativeLayout to respond to clicks, you might expect that all necessary states, like focused, pressed, or selected, would change its colors appropriately. However, some developers find that despite using attributes like android:state_focused, android:state_pressed, and android:state_selected, the colors remain unchanged on click. This can be frustrating, but we will explain why this happens and how you can fix it.

Original XML Structure

Below is an example of the initial RelativeLayout XML setup:

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Setting Up The Selector for Background Change

Creating shape_rectangle_plan.xml

First, we need to create a selector for our shape rectangle to define how it should respond to being selected. Below is the updated shape_rectangle_plan.xml:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Selector

item: Defines the shape for different states of the view.

state_selected: Triggers when the layout is selected (clicked).

solid and stroke: Specify the visual aspects of the layout, including its color and outline.

Implementing the Click Listener

To ensure that the layout changes when it's clicked, you need to implement a click listener that activates the selected state. Depending on whether you're using Java or Kotlin, here are the examples.

Java Implementation

[[See Video to Reveal this Text or Code Snippet]]

Kotlin Implementation

[[See Video to Reveal this Text or Code Snippet]]

Summary

By following the steps outlined above, you can effectively change the background and stroke color of your RelativeLayout upon clicking it. The key components are the XML selector that defines how the layout appears in different states, combined with an appropriate click listener to toggle the selected state.

Good luck implementing this in your project, and enjoy creating a more dynamic and engaging user experience! If you have any questions or need further clarification, feel free to drop a comment below.