Скачать или смотреть How to Control View Visibility to Gone in Android: Implementing Pause and Start Functionality

Learn how to effectively manage view visibility in Android by implementing a dynamic pause and start button that hides all views except for a play button.
---
This video is based on the question https://stackoverflow.com/q/62773056/ asked by the user 'Manpreet Narang' ( https://stackoverflow.com/u/13307472/ ) and on the answer https://stackoverflow.com/a/62773760/ provided by the user 'Trung Nguyen' ( https://stackoverflow.com/u/9629803/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Visibility to Gone in Android

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Introduction

If you're developing an Android application with dynamic views, you might encounter challenges with managing the visibility of those views. A common scenario arises when you want to implement a feature that requires a pause and start button—where clicking pause would make all dynamic views disappear, leaving only the play button visible. This guide will walk you through the process of achieving this functionality using a two-dimensional array of ImageView components.

Problem Statement

You have a setup where multiple ImageViews are generated in a grid-like structure, and you want to create interactive controls via buttons. Specifically, when the "Pause" button is clicked, all ImageView instances should become invisible (or "gone") while still keeping the play button visible. The goal is to learn how we can leverage Android's View.GONE property effectively.

Solution Overview

The solution involves two parts:

Setting up the dynamic views with constraints (as you have already done).

Handling the visibility of these views using a simple loop.

Setting Up Dynamic View Layout

You mentioned that you have already implemented code to generate your ImageView instances dynamically, layer them, and apply constraints. Here's a brief overview of what your existing setup looks like:

You create a two-dimensional array of ImageViews.

You use nested loops to assign IDs and layouts to each ImageView.

ConstraintSet is employed to manage the layout positions dynamically.

While this part of your code is solid, the key to addressing your visibility issue lies in how we interact with these views programmatically.

Implementing the Visibility Change

To change the visibility of all ImageView instances, you can iterate through the array of views and set each one to View.GONE. This simple code snippet can be employed wherever you handle the click event of the "Pause" button:

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

How This Works:

Looping through the Array: The nested loops allow you to access each individual ImageView in your array, systematically.

Setting Visibility: By calling setVisibility(View.GONE), each ImageView is effectively removed from the layout, meaning it won't take up any space, nor will it be visible on the screen.

Making the Play Button Visible

Retention of the play button's visibility can be done easily after setting the images to gone. Just ensure that the play button's visibility is explicitly set to VISIBLE or remains unaffected by the loop:

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

Conclusion

In summary, managing view visibility in Android can be straightforward once you implement the corresponding methods. By utilizing loops and setting each ImageView in your array to View.GONE, you'll achieve the desired effect when the pause button is pressed. Adjusting this solution to include a play button, which remains unaffected, creates a dynamic and interactive user experience.

By following this guide, you’ll be able to implement effective visibility controls for dynamic views in your Android application confidently. Happy coding!