docs: Continue CL of emoji section in api-overview

        <li><a href="#number-blocking">Number-blocking</a></li>

        <li><a href="#call_screening">Call screening</a></li>

        <li><a href="#multi-locale_languages">Locales and languages</a></li>

        <li><a href="#emoji">New Emojis</a></li>

        <li><a href="#icu4">ICU4J APIs in Android</a></li>

        <li><a href="#gles_32">OpenGL ES 3.2 API</a></li>

        <li><a href="#android_tv_recording">Android TV recording</a></li>

        <li><a href="#scoped_directory_access">Scoped directory access</a></li>

        <li><a href="#print_svc">Print service enhancements</a></li>

        <li><a href="#virtual_files">Virtual Files</a></li>

        <li><a href="#emoji">New Emojis</a></li>

      </ol>

</div>

</div>

should follow, see <a href="{@docRoot}preview/features/multilingual-support.html"

>Multilingual Support</a>.</p>

<h2 id="emoji">New Emojis</h2>

<p>

  Android N introduces additional emojis and emoji-related features including

  skin tone emojis and support for variation

  selectors. If your app supports emojis,

  follow the guidelines below to take advantage of these emoji-related features.

</p>

<ul>

  <li>

    <strong>Check that a device contains an emoji before inserting it.</strong>

    To check which emojis are present in the

    system font, use the {@link android.graphics.Paint#hasGlyph(String)} method.

  </li>

  <li>

    <strong>Check that an emoji supports variation selectors.</strong>

    Variation selectors allow you to

    present certain emojis in color or in black-and-white.

    On mobile devices, apps should represent emojis in color rather than black-and-white. However,

    if your app displays emojis inline with text, then it should use the black-and-white variation.

    To determine whether an emoji has a variation, use the variation selector.

    For a complete list of characters with variations, review the

    <em>emoji variation sequences</em> section of the

    <a class="external-link"

    href="http://www.unicode.org/Public/9.0.0/ucd/StandardizedVariants-9.0.0d1.txt">

      Unicode documentation on variations</a>.

  </li>

  <li>

    <strong>Check that an emoji supports skin tone.</strong> Android N allows users to modify the

    rendered skin tone of emojis to their preference. Keyboard apps should provide visual

    indications for emojis that have multiple skin tones and should allow users to

    select the skin tone that they prefer. To determine which system emojis have

    skin tone modifiers, use the {@link android.graphics.Paint#hasGlyph(String)}

    method. You can determine which emojis use skin tones by reading the

    <a class="external-link"

    href="http://unicode.org/emoji/charts/full-emoji-list.html">

     Unicode documentation</a>.

  </li>

</ul>

<h2 id="icu4">ICU4J APIs in Android</h2>

<p>

  <a href="{@docRoot}guide/topics/providers/document-provider.html">Storage

  Access Frameworks guide</a>.

</p>

<h2 id="emoji">New Emojis</h2>

<p>

  Android N introduces new emojis, including skin tone emojis, support

  for variation

  selectors, and other improvements. For a good user experience, observe the

  following guidelines for using the new emojis and emoji features in your apps.

</p>

<ul>

  <li>

    <strong>New emojis</strong>: To check which emojis are present in the

    system font, use the {@link android.graphics.Paint#hasGlyph(String)} method

    and the dynamic layout in the emoji picker to place the glyphs.

  </li>

  <li>

    <strong>Variation selectors</strong>: Variation selectors allow certain

    emojis to be represented in color or in text presentation, which is used in

    documents. For mobile devices, emojis should use their color representation.

    To determine whether an emoji has a variation, use the variation selector.

    You can view the complete list of characters with variations in the

    <em>emoji variation sequences</em> section of the

    <a href="http://www.unicode.org/Public/9.0.0/ucd/StandardizedVariants-9.0.0d1.txt">

      Unicode documentation on variations</a>.

  </li>

  <li>

    <strong>Skin tone modifiers</strong>: In Android N, users can modify the

    rendered skin tone of emojis. This allows users to customize the presentation

    of emojis to their preference. Keyboard apps should provide visual

    indications for emojis that have multiple skin tones and should allow users to

    select the skin tone that they prefer. To determine which system emojis have

    skin tone modifiers, use the {@link android.graphics.Paint#hasGlyph(String)}

    method. You can determine which emojis use skin tones by reading the

    <a href="http://unicode.org/emoji/charts/full-emoji-list.html">

     Unicode documentation</a>.

  </li>

</ul>

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