HtmlTextView

Additional

Language
Java
Version
v3.1 (Dec 19, 2016)
Created
Sep 2, 2013
Updated
Nov 15, 2019
Owner
Sufficiently Secure (SufficientlySecure)
Contributors
Dominik Schürmann (dschuermann)
kamiox
seato
danielpassos
andhie
ranterle
SuperPichu
kimkha
Dion Segijn (DanielMartinus)
dhenry
feeeei
derekcsm
Mykola Kucheriaviy (Ne1c)
ShikherVerma
YuanWenHai
foobar2016
DevGary
ofalvai
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HtmlTextView for Android

HtmlTextView is an extended TextView component for Android, which can load very simple HTML by converting it into Android Spannables for viewing.

In addition to a small set of HTML tags, the library allows to load images from the local drawables folder or from the Internet.

This library is kept tiny without external dependencies.

How to import

Add this to your build.gradle:

repositories {
    jcenter()
}

dependencies {
    compile 'org.sufficientlysecure:html-textview:3.8'
}

Example

<org.sufficientlysecure.htmltextview.HtmlTextView
            android:id="@+id/html_text"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:textAppearance="@android:style/TextAppearance.Small" />
HtmlTextView htmlTextView = (HtmlTextView) view.findViewById(R.id.html_text);

// loads html from string and displays cat_pic.png from the app's drawable folder
htmlTextView.setHtml("<h2>Hello wold</h2><ul><li>cats</li><li>dogs</li></ul><img src=\"cat_pic\"/>",
    new HtmlResImageGetter(htmlTextView));

or

HtmlTextView htmlTextView = (HtmlTextView) view.findViewById(R.id.html_text);

// loads html from string and displays cat_pic.png from the app's assets folder
htmlTextView.setHtml("<h2>Hello wold</h2><ul><li>cats</li><li>dogs</li></ul><img src=\"cat_pic\"/>",
    new HtmlAssetsImageGetter(htmlTextView));

or

HtmlTextView htmlTextView = (HtmlTextView) view.findViewById(R.id.html_text);

// loads html from string and displays http://www.example.com/cat_pic.png from the Internet
htmlTextView.setHtml("<h2>Hello wold</h2><img src=\"http://www.example.com/cat_pic.png\"/>",
    new HtmlHttpImageGetter(htmlTextView));

or

HtmlTextView htmlTextView = (HtmlTextView) view.findViewById(R.id.html_text);

// loads html from raw resource, i.e., a html file in res/raw/,
// this allows translatable resource (e.g., res/raw-de/ for german)
htmlTextView.setHtml(R.raw.help, new HtmlHttpImageGetter(htmlTextView));

or

<TextView
    android:id="@+id/html_text"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:textAppearance="@android:style/TextAppearance.Small" />
TextView htmlTextView = (TextView) view.findViewById(R.id.html_text);

// loads html from string and displays cat_pic.png from the app's drawable folder
Spanned formattedHtml = HtmlFormatter.formatHtml(new HtmlFormatterBuilder().setHtml("<h2>Hello wold</h2><ul><li>cats</li><li>dogs</li></ul><img src=\"cat_pic\"/>").setImageGetter(new HtmlResImageGetter(htmlTextView.getContext())));
htmlTextView.setText(formattedHtml);

Supported HTML tags

Tags supported by Android (history of Html class)

Extended support by HtmlTextView

  • <ul>
  • <ol>
  • <li>
  • <code>
  • <center>
  • <strike>

Support for HTML tables

HtmlTextView now supports HTML tables (to a limited extent) by condensing the text into a link which developers are able to render in a native WebView. To take advantage of the feature you'll need to:

  1. implement a ClickableTableSpan which provides access to the table HTML (which can be forwarded to a WebView)

  2. provide a DrawTableLinkSpan which defines what the table link should look like (i.e. text, text color, text size)

Take a look at the project's sample app for an example.

We recognize the standard table tags:

  • <table>
  • <tr>
  • <th>
  • <td>

as well as the tags extended by HtmlTextView. However, support doesn’t currently extend to tags natively supported by Android (e.g. <b>, <big>, <h1>) which means tables will not include the extra styling.

Changelog

3.8

  • Add HtmlFormatter for use with standard TextView

3.7

  • Fix #166
  • Migrated to AndroidX

3.6

  • Improve and fix indentions

3.5

  • Allow image compression

3.4

  • Fix textIsSelectable

3.3

  • Fix text cutting bug
  • Prevent EmptyStackException when processing malformed li tags

3.2

  • Indenting entries of ordered lists the same way as of unordered lists
  • Fix OutOfMemory

3.1

  • Override handling of <ul> <ol> and <li> tags done by newer versions of Android SDK (removes empty lines between items)

3.0

  • Removed deprecated methods and classes
  • Fix out of bounds issue

2.0

  • Introduce better API

License

Apache License v2

See LICENSE for full license text.

Authors

Contributions

Feel free to fork and do pull requests. I am more than happy to merge them. Please do not introduce external dependencies.