Multiple Canvas

What do you want to do ?
Do you want to attached the different canvases to a same bitmap or a same view, and if yes why ?
You can add different canvases to a same activity attached to different views.
I'm currently testing a program with 2 Imageviews, each with it's own Canvas, to simulate different layers, playing with transparent background and the visible parameter.

Best regards.

I want 5 canvases for drawing strings with different font colors . In to 2 canvases I have to draw some lines and within that I have to draw strings . For that how should I use canvases ?

You can use a single canvas for all these drawings.
Canvas.DrawText accepts a color parameter.