Is Canvas buffering required

[enonod]

Having a little trouble understanding the documentation.

I wish to display something I have drawn while modifying the drawing 'offline' so to speak, then display the updated drawing, while I further update that 'offline' yet again in a continuous cycle.
1. Do I need two canvases or two bitmaps or both; so that I have what I normally think of as an offline buffer? OR

2. Do I use one and simply call invalidate after each update assuming that the interim cannot be seen?

A little tiny example would be much appreciated.

 

[Erel]

Buffering is not required as you are not drawing directly to the screen.

Invalidate is similar to a "dirty" flag. You mark the area that should be redrawn and later it will be redrawn when the system is free to redraw (or when you call DoEvents).
There are many examples of Canvas. Basic4android Search: Canvas

 

[enonod]

Thank you Erel, I am beginning to get into this conversion. I have followed your link to a plethora of Christmas reading (in England at least).