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Discover an effective method to bold text placeholders in Android TextViews using SpannableString for clearer and more engaging interfaces.
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How to Make a Placeholder Bold in TextView on Android

If you're developing an Android app and want to add a bit of flair to your TextView, you might find yourself wanting to emphasize certain parts of the text, such as a placeholder. Specifically, you may want to make a placeholder bold to help it stand out. In this post, we'll explore an effective solution to this common requirement among Android developers.

The Problem

You might encounter a scenario where you need to display a dynamic string in your TextView, and you want a portion of that string to be bold. For instance, if you're retrieving a group title from a database, you want to highlight it within a sentence.

In a typical implementation, you might try using HtmlCompat.fromHtml() with a formatted string, but if the placeholder doesn't appear bold, that can be frustrating. This was exactly the issue faced by a fellow developer, who needed to bold a placeholder but found that the HTML method was not working as expected.

The Solution: Using SpannableString

To achieve the desired result, you can utilize SpannableString. This approach allows you to format parts of the string dynamically, lending you the flexibility needed to bold the specific placeholder. Here's how to do it step by step.

Step 1: Split Your Strings

First off, you need to divide your sentence into two separate string resources. In your strings.xml file, you might add:

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Step 2: Assemble the Full String

Next, you have to compile the complete sentence using these two parts along with your dynamic placeholder. In your Kotlin file, do the following:

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This will retrieve the dynamic content that you want to make bold. If it's not available, it defaults to an empty string.

Step 3: Create the SpannableString

Now, construct the entire string and create a SpannableString from it:

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Step 4: Bold the Placeholder

Now it's time to mark the desired placeholder as bold. You can achieve this by specifying the start and end indices of the substring you want to bold:

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Step 5: Set the Spannable to Your TextView

Finally, you can set this spannable text to your TextView:

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Conclusion

By using SpannableString, you can highlight specific parts of your TextView text effectively. This method not only improves the user experience but also makes your application's interface more visually appealing.

Now, whenever you need to bold a placeholder in your TextView, you have a proven method to achieve it! Happy coding!