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Discover how to effectively split TextViews and utilize Spannable Strings in Android to enhance text display within your applications.
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Splitting TextView and Spannable String in Android: A Simplified Guide

When developing Android applications, one common task developers might encounter is formatting text within a TextView. In this guide, we'll address a specific issue related to splitting text and applying styles using SpannableString. The example we'll explore involves the string "3,48" and how to highlight the number "3" while displaying the rest of the text correctly.

The Problem

Suppose you're working with a TextView that contains the string "3,48". You want to display the number "3" larger than "48". Initially, you might try using the split method on the string to separate the numbers for styling purposes, as shown below:

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However, the code above results in only the first character "3" being displayed in the TextView, as the setText method is only using the first element of the split array, thus omitting the rest of the text.

The Solution

Use the Original String

Instead of splitting the string into parts, we can work directly with the original string and apply the span to the desired section. This ensures we don't lose any text outside of what we are formatting.

Step-by-Step Implementation

Get the Full Text: Retrieve the entire text from the TextView without splitting it.

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Create a Spannable String: Initialize a SpannableString using the full text.

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Set the Span: Apply the RelativeSizeSpan to the portion of the text you want to enlarge. Here, you would specify that you want to grow the font size of the first part (up to the comma).

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Set the Formatted Text: Finally, assign the newly formatted SpannableString back to the TextView.

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Full Code Example

Here's how your complete implementation might look:

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Conclusion

By using the entire string instead of splitting it up, you can effectively format text while ensuring visibility of all parts. This simple approach allows you to maintain control over how your text appears, improving user experience within your applications. So, whenever you need to emphasize parts of your string, remember, often you can avoid splitting and still achieve stunning results with the SpannableString!