I'm sure anybody who's used openGL will of come across a situation where the animation or movement isn't smooth so here are some tips in the hope of people posting some more.
1. Make sure you animate/move using a timer to maintain a constant rate of movement regardless of processing speed. So, x = now draw 1st frame y = now movementFactor = y - x; draw 2nd frame repeat That sorts some problems. 2. Stop the GC firing. If you're getting the gc firing message in the logcat whilst movement or animation is taking place your likely to be allocating ram. You can check this in ddms, goto the allocation tracker, hit start tracking then get allocation and you'll see what methods have been allocating ram. 3. Stop allocations even if the GC isn't firing! This helped me a bundle, I was allocating a lot of Strings and once I sorted this out I found the frame rate to fluctuate less. 4. Put the phone in airplane mode when doing performance testing and kill all tasks prior to running your app. 5. (Not tried this one yet) Apparently you're eye is very good at seeing jerks in animations.movement so it's actually better to reduce your frame rate artificially as explained by Mario Zechner below, "Average your delta times, it's the only way you can smooth things out. I use a window of 5 frames per second for which i sum up the delta times and divide by the number of frames. An example, 15ms, 15ms, 33ms, 15ms, 15ms will give you an average delta time of 18.6ms for frame 6. The 33ms will also influence the delta time of the next 4 frames after it. To avoid that effect you could use weighted averaging: frame delta times that are newer receive a higher weight (just an example, haven't boughtered using it)" Does anyone have any other ideas concerning this topic? -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
