Autograph has not been redone for the Android but you can download GeoGebra, which is free. It is not as powerful as the PC version but is quite useable. I use it with a mouse to get greater acccuracy (being one of the drawbacks of touch screen). There is an input bar for entering equations & coordinates, lines can be coloured, thickened, the background can be plain or have a grid.
GeoGebra has support via a Wiki and also ready created files. I have not yet tried opening a PC version file on my tablet or vice versa yet.
Hope this helps