As usage issues

① Import Project appears--gradle Project sync failed What, what?

Under Android Studio, click Tools->android->sync Project with Gradles files. And then it's solved ~ As for why oh don't know.

Ii

Renderer.setaxistitletextsize (36);//Set axis title text size    axis axis meaning
Renderer.setapplybackgroundcolor (TRUE);//must be set to true for color values to take effect
Renderer.setbackgroundcolor (Color.White);//Set table background color
Renderer.setmarginscolor (Color.White);//Setting the surrounding background color

As usage issues