materio-base-d7/sites/all/modules/contrib/seo/metatag/metatag_mobile/metatag_mobile.module

<?php
/**
 * @file
 * Primary hook implementations for Metatag:Mobile.
 */

/**
 * Implements hook_ctools_plugin_api().
 */
function metatag_mobile_ctools_plugin_api($owner, $api) {
  if ($owner == 'metatag' && $api == 'metatag') {
    return array('version' => 1);
  }
}

/**
 * Implements hook_theme().
 */
function metatag_mobile_theme() {
  $info['metatag_mobile_android_app'] = array(
    'render element' => 'element',
  );
  $info['metatag_mobile_ios_app'] = array(
    'render element' => 'element',
  );
  $info['metatag_mobile_alt_handheld'] = array(
    'render element' => 'element',
  );

  return $info;
}

/**
 * Theme callback for an Android app link meta tag.
 *
 * The format is:
 * <link rel="alternate" href="android-app://com.example.Example/sitesection/sitepage/thispage" />
 */
function theme_metatag_mobile_android_app($variables) {
  // Pass everything through to the normal 'link' tag theme.
  $variables['element']['#name'] = 'alternate';
  $variables['element']['#value'] = 'android-app://' . $variables['element']['#value'];

  return theme('metatag_link_rel', $variables);
}

/**
 * Theme callback for an iOS app link meta tag.
 *
 * The format is:
 * <link rel="alternate" href="ios-app://123456/example/hello-screen" />
 */
function theme_metatag_mobile_ios_app($variables) {
  // Pass everything through to the normal 'link' tag theme.
  $variables['element']['#name'] = 'alternate';
  $variables['element']['#value'] = 'ios-app://' . $variables['element']['#value'];

  return theme('metatag_link_rel', $variables);
}


/**
 * Theme callback for a handheld-formatted alternative URL.
 *
 * The format is:
 * <link rel="alternate" media="handheld" href="https://phone.example.com/the/page" />
 */
function theme_metatag_mobile_alt_handheld($variables) {
  $element = &$variables['element'];
  $args = array(
    '#name' => 'rel',
    '#media' => 'media',
    '#value' => 'href',
  );
  element_set_attributes($element, $args);
  unset($element['#value']);
  return theme('html_tag', $variables);
}

/*
* theme-color
* MobileOptimized
* HandheldFriendly
* viewport
* cleartype
* apple-mobile-web-app-capable
* apple-mobile-web-app-status-bar-style
* format-detection
* android-app
*/