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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:4.0'
}

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)

<p>
<div> handled exactly like <p>
<br>
<b>
<i>
<strong> (bug on some Android versions: generates italic)
<em> (bug on some Android versions: generates bold)
<u>
<tt>
<dfn>
<sub>
<sup>
<blockquote>
<cite>
<big>
<small>
<font color="..." face="...">
<h1>, <h2>, <h3>, <h4>, <h5>, <h6>
<a href="...">
<img src="...">

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:

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

Support for A tag click listener

textView.setOnClickATagListener(new OnClickATagListener() {

    @Override
    public void onClick(View widget, @Nullable String href) {
        Toast.makeText(MainActivity.this, href, Toast.LENGTH_SHORT).show();
    }
});

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

4.0

3.9

Add A tag click listener

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.

License

SufficientlySecure/html-textview

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