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Android Development
TextView Justification
Android UI Design
Mobile App Development
Text Alignment Techniques

Android TextView Justify Text

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Introduction

Text justification in Android TextView is version-dependent and often misunderstood. Native full justification support is available from Android API level twenty-six, while older versions require fallback strategies. A reliable implementation should handle both modern and legacy devices without sacrificing readability.

Native Justification on Modern Android

From API level twenty-six onward, TextView supports inter-word justification.

XML usage:

xml
1<TextView
2    android:id="@+id/body"
3    android:layout_width="match_parent"
4    android:layout_height="wrap_content"
5    android:text="@string/long_paragraph"
6    android:justificationMode="inter_word" />

Programmatic usage in Kotlin:

kotlin
1val body: TextView = findViewById(R.id.body)
2if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
3    body.justificationMode = Layout.JUSTIFICATION_MODE_INTER_WORD
4}

This should be your default on supported versions.

Why Justification Can Look Uneven

Even with native support, justified text quality depends on:

  • line width
  • language and hyphenation opportunities
  • text size and font choice
  • word-length distribution

Very narrow text containers can produce awkward spacing because engine stretches gaps across each line.

Improve Visual Quality with Hyphenation and Break Strategy

For better paragraph flow, combine justification with break strategy settings.

kotlin
1if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
2    body.breakStrategy = Layout.BREAK_STRATEGY_HIGH_QUALITY
3    body.hyphenationFrequency = Layout.HYPHENATION_FREQUENCY_NORMAL
4}
5
6if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
7    body.justificationMode = Layout.JUSTIFICATION_MODE_INTER_WORD
8}

These options reduce large spacing artifacts in many languages.

Backward Compatibility for Older API Levels

Pre-API twenty-six devices do not support native justification mode. Options include:

  • leave text left-aligned for consistency and simplicity
  • use WebView rendering for justified HTML content
  • use a custom text layout library if strict justification is required

For many apps, graceful left alignment on older devices is the best tradeoff.

Example fallback decision:

kotlin
1if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
2    body.justificationMode = Layout.JUSTIFICATION_MODE_INTER_WORD
3} else {
4    body.textAlignment = View.TEXT_ALIGNMENT_VIEW_START
5}

This avoids complicated custom rendering unless product requirements demand it.

WebView Fallback Tradeoffs

Using WebView can provide justification on older devices, but adds complexity:

  • heavier rendering component
  • lifecycle and memory overhead
  • text styling split between Android and HTML layers

Only use this path when justified typography is truly mandatory across all API levels.

Simple WebView example:

kotlin
1val html = """
2<html>
3  <body style='text-align: justify; font-size: 16px;'>
4    ${'$'}{longText}
5  </body>
6</html>
7""".trimIndent()
8
9webView.loadDataWithBaseURL(null, html, "text/html", "utf-8", null)

Keep content sanitized when rendering dynamic user input.

Performance and Layout Considerations

Justified text can increase layout work in long scrolling lists. In RecyclerView, avoid unnecessary text re-layout by:

  • diffing item content before updates
  • keeping paragraph width stable
  • minimizing repeated style recomputation

For content-heavy feeds, profile frame timing to ensure readability improvements do not introduce jank.

Localization and Script Differences

Justification behavior differs by language and script. Latin text often justifies with inter-word spacing, while other scripts may need different line-breaking behavior.

Test with real localized strings, not placeholder English text only. This prevents spacing regressions in production locales.

Accessibility Considerations

Justification can reduce readability for some users due to irregular spacing. Support dynamic text sizing and test with larger font scales.

If accessibility testing shows readability problems, consider exposing a user preference for alignment mode in settings.

Common Pitfalls

A common pitfall is enabling justificationMode without API checks and causing crashes on older devices. Another is forcing justification in very narrow containers, leading to ugly spacing and poor readability. Teams also often test only one language and overlook localization-specific layout issues. Finally, adopting heavy WebView fallbacks without profiling can hurt performance in text-heavy screens.

Summary

  • Native TextView justification is available from API level twenty-six.
  • Pair justification with break strategy and hyphenation for better visual output.
  • Use clear fallback behavior on older Android versions.
  • Validate typography across locales, font scales, and container widths.
  • Choose readability and maintainability over overly complex compatibility hacks.
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