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Learn how to dynamically `change images` and text in your Android app using Java when switching languages. Step-by-step guide included!
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This video is based on the question https://stackoverflow.com/q/64526512/ asked by the user 'Maciej Scheffer' ( https://stackoverflow.com/u/11098010/ ) and on the answer https://stackoverflow.com/a/64526569/ provided by the user 'Hayssam Soussi' ( https://stackoverflow.com/u/4039784/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Change Drawable Source in Android from a Java File

When developing an Android application that supports multiple languages, providing a seamless user experience is essential. A common requirement is to change not only the text displayed on the user interface but also the accompanying images or icons, such as flags, when the user switches languages. This guide will give you a step-by-step guide on how to achieve this in your Android app using Java.

The Problem: Changing Button Drawable and Text

Let’s say you have a button that displays a flag and a country name, such as (Flag) ENG for English. You want to switch both the text and the image of the button when the user clicks it to change the application language. While you may know how to handle changing the text part, you might be scratching your head on how to change the image source.

Initial Code Setup

You start with an XML layout that looks somewhat like this for your button:

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

In your Java file, the button click method may look like this:

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

The Solution: Using setCompoundDrawables

To change the drawable (image/icon) displayed on the button, you can use the setCompoundDrawables method. This method allows you to set drawables (such as images) for the button on various sides (left, top, right, bottom).

Step-by-Step Implementation

Import Required Classes: Make sure to import any necessary classes at the top of your Java file.

Update the Button Click Method: Modify the LanguageButtonClick() method to dynamically change the drawable based on the selected language.

Here's how the complete function should look:

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

Explanation of the Code

Drawable Object: You create a Drawable object using getResources().getDrawable(R.drawable.ic_poland) or getResources().getDrawable(R.drawable.ic_united_kingdom) to retrieve the corresponding drawable resources (the country flags).

Setting the Drawable: The method setCompoundDrawables(Drawable left, Drawable top, Drawable right, Drawable bottom) allows you to specify drawables for the left, top, right, and bottom positions. In this case, we use the left position for the flag.

Important Note

Keep in mind that with recent versions of Android, you might need to use ContextCompat.getDrawable() instead to cater to different API levels.

Conclusion

Changing the drawable source in your Android app when the user clicks a button is a straightforward task with the right approach. By utilizing the setCompoundDrawables method, you can create a more interactive and user-friendly app experience.

Now you should be able to implement this functionality, enriching the user interaction of your application. Happy coding!