http://kio4.com/appinventor/169D_javascript_graficos.htm
Regards.
Pie, Line, Columns:
https://google-developers.appspot.com/chart/interactive/docs/gallery/piechart
https://developers.google.com/chart/interactive/docs/gallery/linechart
https://developers.google.com/chart/interactive/docs/gallery/columnchart
google_chart.htm file is http://kio4.com/appinventor/169DD_googlechart.htm