Knife

✨ Knife Editor – Change Log

• 🚀 Migrated project to Gradle 9
• 🔧 Updated Android Gradle Plugin and dependencies
• 🎨 Migrated UI to Material Design 3
• 🧩 Replaced legacy views with modern Material components
• 🌗 Improved light and dark theme consistency
• 🛠 Redesigned formatting toolbar using Material 3 spacing rules
• 🔁 Moved Undo and Redo to bottom tools bar
• 🔄 Fixed source / code toggle to switch both ways correctly
• ⚠️ Added confirmation dialog before clearing formatting
• 🎯 Centralized editor styling using KnifeText attributes
• 🎨 Applied Material 3 semantic colors instead of hardcoded values
• ✍️ Improved bullets, quotes, and link styling
• ♿ Added tooltips and content descriptions for accessibility
• 👆 Improved touch targets for better usability
• 🧯 Fixed crashes related to editor initialization
• 🧠 Fixed text selection and ActionMode conflicts
• 🔁 Improved undo / redo stability
• 🧹 Cleaned and organized codebase
• 🗑 Removed unused logic and hardcoded strings

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Knife (extends EditText) is a lightweight rich text editor component for writing styled documents in Android.

Just select text and apply formatting with a single line of code.

Supports Android 4.0+

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📸 Example

Download the demo APK
Explore the source code

More experiments: mthli/Type

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🧠 API

• bold(boolean valid) → Apply bold
• italic(boolean valid) → Apply italic
• underline(boolean valid) → Apply underline
• strikethrough(boolean valid) → Apply strikethrough
• bullet(boolean valid) → Apply bullet list
• quote(boolean valid) → Apply quote block
• link(String link) → Apply link to selection
• link(String link, int start, int end) → Apply link to range
• contains(int FORMAT) → Check if selection contains format
• clearFormats() → Remove all formatting
• undo() → Undo last change
• redo() → Redo change
• fromHtml() → Import from HTML
• toHtml() → Export to HTML

Extend KnifeText for deeper control.

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🎛 Custom Attributes

• app:bulletColor
• app:bulletRadius
• app:bulletGapWidth
• app:historyEnable
• app:historySize
• app:linkColor
• app:linkUnderline
• app:quoteColor
• app:quoteStripeWidth
• app:quoteGapWidth

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📦 Gradle Setup

Add JitPack repository:

dependencyResolutionManagement {
    repositories {
        maven { url = uri("https://jitpack.io") }
    }
}

Add dependency:

dependencies {
    implementation("com.github.mthli:Knife:v1.1")
}

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📚 References

• Spans, a Powerful Concept
  http://flavienlaurent.com/blog/2014/01/31/spans/

• Spanned | Android Developers
  http://developer.android.com/reference/android/text/Spanned.html

• Html.java Source
  https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/text/Html.java

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🙏 Thanks

• https://github.com/neilj/Squire
• https://github.com/SufficientlySecure/html-textview

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📜 License

Copyright 2015 Matthew Lee

Licensed under the Apache License, Version 2.0
http://www.apache.org/licenses/LICENSE-2.0

Distributed on an "AS IS" BASIS, without warranties or conditions of any kind.