Override onDraw() or draw()?

Question

My project is based on surfaceView and up until now I\'ve had all of my rendering in onDraw which I am overriding. All seemed to be OK.

However, I\'ve just updated my S

Answer 1

SurfaceView.draw() basically calls View.draw(); If you want to implement your drawing, you should do it in View.onDraw() which is for you to implement which even says in the source code comments.

This method is called by ViewGroup.drawChild() to have each child view draw itself. This draw() method is an implementation detail and is not intended to be overridden or to be called from anywhere else other than ViewGroup.drawChild().

As for difference between them:
draw():

13416        /*
13417         * Draw traversal performs several drawing steps which must be executed
13418         * in the appropriate order:
13419         *
13420         *      1. Draw the background
13421         *      2. If necessary, save the canvas' layers to prepare for fading
13422         *      3. Draw view's content
13423         *      4. Draw children
13424         *      5. If necessary, draw the fading edges and restore layers
13425         *      6. Draw decorations (scrollbars for instance)
13426         */

onDraw() is empty. Its for you to implement.