Hi Romain, Thanks for your response.
I was experiencing a very interesting behavior. I started using a custom view inside a framelayout, and performed all the primitive operations and called invalidate() to let the system call onDraw. It was choking. I even tried to invalidate a rect, but it was just not fast enough - the 2nd view that was requesting the underlying view to redraw certain primitives based on the actions on the 2nd view was not responsive. I then started using the SurfaceView to see if there is any benefit for the same operation - and voila - it worked like a charm. This is why is used SurfaceView as a substitute - there was an apparent performance benefit. That said, I'm going to take another look at my hierarchy, and all the custom views (there are quite a few), to make sure there are no other leaks. Like you said, I would rather use a View instead of SurfaceView. Thanks for your input though - it does answer the question that I can use a canvas with TextureView if i follow the intended mode of use. -Ajit On Saturday, September 29, 2012 2:47:45 PM UTC-7, Romain Guy (Google) wrote: > > Hi, > > If you were using SurfaceView's onDraw() method then you were not > getting any benefit. You have to use > lockCanvas()/unlockCanvasAndPost() and post on the underlying Surface. > TextureView works in a similar way: you can call > lockCanvas()/unlockCanvasAndPost(). > > However, it seems all you need is a View. It's easier to use and since > you are not using SurfaceView properly anyway it will do the same > thing. > > On Thu, Sep 27, 2012 at 2:19 PM, Ajit Vasudevan > <vasu...@gmail.com<javascript:>> > wrote: > > Hello, > > > > I am currently working on an app that requires computations/rendering > based > > on a variety of user inputs. I have implemented the SurfaceView and > things > > work as expected. > > But I started facing performance issues when I tried to put this inside > a > > horizontal scroll view. Obviously it is not intended to work this way - > but > > I tried anyway :) > > Based on what I have read - it appears like I have to move to > TextureView. > > But i am unable to override the onDraw, and therefore cannot perform the > > necessary drawing using the Canvas. This might be a trivial question - > but I > > wanted to know if we can use TextureView to draw primitives on the > screen > > using a Canvas? The only examples I have seen thus far show the use of > > video/camera/openGL rendering on the TextureView. > > > > Any help on this would be great. > > > > Thanks much > > -Ajit > > > > -- > > You received this message because you are subscribed to the Google > > Groups "Android Developers" group. > > To post to this group, send email to > > android-d...@googlegroups.com<javascript:> > > To unsubscribe from this group, send email to > > android-developers+unsubscr...@googlegroups.com <javascript:> > > For more options, visit this group at > > http://groups.google.com/group/android-developers?hl=en > > > > -- > Romain Guy > Android framework engineer > roma...@android.com <javascript:> > -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
