====== Open Calculator app ======

On many phones a different Calculator app is installed.
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Here's how to search for an app with calculator in it's name and open it

<code>
    var list =app.GetActivities();
    
    for(var i in list) {
        var a = list[i];
           l = a.label ;
           p = a.packageName ;
           c = a.className ;
          if (p.indexOf("calculator") > -1) {break;}
       }
    app.SendIntent(p,c, "android.intent.android.settings.VIEW"); 

</code>