CheckPlaystoreVersion

var packageName = "com.smartphoneremote.androidscriptfree";
var path = "/store/apps/details";
var params="id=" + packageName;

//Called when application is started.
function OnStart()
{
    //Create a layout with objects vertically centered.
    lay = app.CreateLayout( "linear", "VCenter,FillXY" );

    //Create a text label and add it to layout.
    txt = app.CreateText( packageName );
    //txt.SetTextSize( 32 );
    lay.AddChild( txt );

    //Add layout to app.
    app.AddLayout( lay );
    app.ShowProgress( null, "NoDim" );
    app.HttpRequest( "GET", "https://play.google.com", path, params, HandleReply, "" );
}
function HandleReply( error, response )
{
    if( !error )
    {
         analyze(response)
    }

    else
    {
        app.HideProgress();
        app.ShowPopup( "Error: " + response);
    }
}
function analyze(rst)
{
     //index of the div tag with ' itemprop="softwareVersion" ' attribute.
     ver_tag_index = rst.indexOf( "itemprop=\"softwareVersion\">" );

     app.HideProgress();
     //If there's no such tag.
     if( ver_tag_index == -1) {
       alert("can't find the version number");

       //Nothing useful ahead. Get out of the function ( won't execute instructions in this function further ).
       return;
     }

     //cut rst from the index of version tag.
     crst = rst.substr( ver_tag_index + 27 );

     //index of first angle bracket in crst.
     angle_index = crst.indexOf("<");

     //cut crst from start to the angi.
     crst = crst.substr(0, angle_index );

     //Remove whitespaces ( if any ) from the beginning and the end of the crst.
     //This is the version number.
     ver_num = crst.trim();

     //If version number "varies with device".
     if( ver_num == "Varies With Device") alert( "Version depends on device");

     txt.SetTextSize( 32 );
     txt.SetText( ver_num );
}