Android markdown library (no WebView)
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noties V2.0.0 (#66)
* Add `html-parser-api` and `html-parser-impl` modules
* Add `HtmlEmptyTagReplacement`
* Implement Appendable and CharSequence in SpannableBuilder
* Renamed library modules to reflect maven artifact names
* Rename `markwon-syntax` to `markwon-syntax-highlight`
* Add HtmlRenderer asbtraction
* Add CssInlineStyleParser
* Fix Theme#listItemColor and OL
* Fix task list block parser to revert parsing state when line is not matching
* Defined test format files
* image-loader add datauri parser
* image-loader add support for inline data uri image references
* Add travis configuration
* Fix image with width greater than canvas scaled
* Fix blockquote span
* Dealing with white spaces at the end of a document
* image-loader add SchemeHandler abstraction
* Add sample-latex-math module
Latest commit e0563dc Sep 17, 2018

README.md

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Markwon

markwon markwon-image-loader markwon-syntax-highlight markwon-view

Markwon is a markdown library for Android. It parses markdown following commonmark-spec with the help of amazing commonmark-java library and renders result as Android-native Spannables. No HTML is involved as an intermediate step. No WebView is required. It's extremely fast, feature-rich and extensible.

It gives ability to display markdown in all TextView widgets (TextView, Button, Switch, CheckBox, etc), Toasts and all other places that accept Spanned content. Library provides reasonable defaults to display style of a markdown content but also gives all the means to tweak the appearance if desired. All markdown features listed in commonmark-spec are supported (including support for inlined/block HTML code, markdown tables, images and syntax highlight).

*This file is displayed by default in the sample-apk (markwon-sample-{latest-version}-debug.apk) application. Which is a generic markdown viewer with support to display markdown via http, https & file schemes and 2 themes included: Light & Dark

Installation

implementation "ru.noties:markwon:${markwonVersion}"
implementation "ru.noties:markwon-image-loader:${markwonVersion}" // optional
implementation "ru.noties:markwon-syntax-highlight:${markwonVersion}" // optional
implementation "ru.noties:markwon-view:${markwonVersion}" // optional

Please visit documentation web-site for further reference

Supported markdown features:

  • Emphasis (*, _)
  • Strong emphasis (**, __)
  • Strike-through (~~)
  • Headers (#{1,6})
  • Links ([]() && [][])
  • Images
  • Thematic break (---, ***, ___)
  • Quotes & nested quotes (>{1,})
  • Ordered & non-ordered lists & nested ones
  • Inline code
  • Code blocks
  • Tables (with limitations)
  • Syntax highlight
  • HTML
    • Emphasis (<i>, <em>, <cite>, <dfn>)
    • Strong emphasis (<b>, <strong>)
    • SuperScript (<sup>)
    • SubScript (<sub>)
    • Underline (<u>, ins)
    • Strike-through (<s>, <strike>, <del>)
    • Link (a)
    • Lists (ul, ol)
    • Images (img will require configured image loader)
    • Blockquote (blockquote)
    • Heading (h1, h2, h3, h4, h5, h6)
    • there is support to render any HTML tag
  • Task lists:
  • Not done
    • Done with X
    • and or small x

Screenshots

Taken with default configuration (except for image loading):

By default configuration uses TextView textColor for styling, so changing textColor changes style


Documentation

Please visit documentation web-site for reference


Demo

Based on this cheatsheet


Headers


Header 1

Header 2

Header 3

Header 4

Header 5
Header 6

Emphasis

Emphasis, aka italics, with asterisks or underscores.

Strong emphasis, aka bold, with asterisks or underscores.

Combined emphasis with asterisks and underscores.

Strikethrough uses two tildes. Scratch this.


Lists

  1. First ordered list item
  2. Another item
  • Unordered sub-list.
  1. Actual numbers don't matter, just that it's a number

  2. Ordered sub-list

  3. And another item.

    You can have properly indented paragraphs within list items. Notice the blank line above, and the leading spaces (at least one, but we'll use three here to also align the raw Markdown).

    To have a line break without a paragraph, you will need to use two trailing spaces. Note that this line is separate, but within the same paragraph. (This is contrary to the typical GFM line break behaviour, where trailing spaces are not required.)

  • Unordered list can use asterisks
  • Or minuses
  • Or pluses

Links

I'm an inline-style link

I'm a reference-style link

I'm a relative reference to a repository file

You can use numbers for reference-style link definitions

Or leave it empty and use the link text itself.


Code

Inline code has back-ticks around it.

var s = "JavaScript syntax highlighting";
alert(s);
s = "Python syntax highlighting"
print s
/**
 * Helper method to obtain a Parser with registered strike-through &amp; table extensions
 * &amp; task lists (added in 1.0.1)
 *
 * @return a Parser instance that is supported by this library
 * @since 1.0.0
 */
@NonNull
public static Parser createParser() {
  return new Parser.Builder()
      .extensions(Arrays.asList(
          StrikethroughExtension.create(),
          TablesExtension.create(),
          TaskListExtension.create()
      ))
      .build();
}
<ScrollView
  android:id="@+id/scroll_view"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:layout_marginTop="?android:attr/actionBarSize">

  <TextView
    android:id="@+id/text"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="16dip"
    android:lineSpacingExtra="2dip"
    android:textSize="16sp"
    tools:context="ru.noties.markwon.MainActivity"
    tools:text="yo\nman" />

</ScrollView>
No language indicated, so no syntax highlighting.
But let's throw in a <b>tag</b>.

Tables

Colons can be used to align columns.

Tables Are Cool
col 3 is right-aligned $1600
col 2 is centered $12
zebra stripes are neat $1

There must be at least 3 dashes separating each header cell. The outer pipes (|) are optional, and you don't need to make the raw Markdown line up prettily. You can also use inline Markdown.

Markdown Less Pretty
Still renders nicely
1 2 3

Blockquotes

Blockquotes are very handy in email to emulate reply text. This line is part of the same quote.

Quote break.

This is a very long line that will still be quoted properly when it wraps. Oh boy let's keep writing to make sure this is long enough to actually wrap for everyone. Oh, you can put Markdown into a blockquote.

Nested quotes

Hello!

And to you!


Inline HTML

<u><i>H<sup>T<sub>M</sub></sup><b><s>L</s></b></i></u>

HTML


Horizontal Rule

Three or more...


Hyphens (-)


Asterisks (*)


Underscores (_)


Applications using Markwon

License

  Copyright 2017 Dimitry Ivanov (mail@dimitryivanov.ru)

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.