Don’t know what you are looking for in an Android app, but I believe Graph+ (IoTaWatt native visualization) should work fine there. Have you tried it with saved graphs?
I like to also use the PVOutput mobile app and web interface for visuals if you are looking for things like generation vs consumption type graphs. If you want more details into the CTs used, I would think the built in graphs would be a better fit. Really depends on what you are looking to visualize.