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var useragent = navigator.userAgent;
if (useragent.match(/Android/i)) {
  // This is an Android device
}

D getenv          PR              *   ExtProc('getenv')
D   name                          *   Value Options(*String)

D useragent       s            250A

 /Free
       useragent = %str(getenv('HTTP_USER_AGENT'));
       If %scan('Android' : useragent) > 0;
         // This is an Android device
       EndIf;
 /End-Free

$useragent = $_SERVER['HTTP_USER_AGENT'];
if (stripos($useragent, 'Android') !== false) {
  // This is an Android device
}