Speed up your app (Droidcon NYC 2015)

With a great variety of tools for optimizing your Android apps, it's easy to get lost and find it hard to even start working on the problem. This talk will cover how to approach a performance issue by picking the right tool for the job, analyzing the data and track down the culprit. We'll review case studies using Systrace, Traceview, Hierarchy Viewer, Allocation Tracker, Eclipse MAT and others, demonstrating variety of problems that many apps suffer from, and how to solve them.

Video is available here: https://www.youtube.com/watch?v=v3DlGOQAIbw

Transcript

1. Speed up your app Udi Cohen
2. MEASURE SLOW DEVICE TRADE-OFFS The Rules: ALWAYS USE CONSIDER
3. Systrace
10. EXAMPLE SYSTRACE
12. Frame >16ms
14. Traceview
16. NAME List of all executed methods
17. INCLUSIVE CPU TIME Time spent on the method and all methods it calls
18. EXCLUSIVE CPU TIME Time spent just in the method itself
19. INC/EXC REAL TIME Actual time the method took from start to finish
20. METHOD CALLS Number of times the method was called and how long each call took (avg.)
21. EXAMPLE TRACEVIEW
26. ??
27. Memory Profiling
29. GC
30. Call GC Dump Heap Alloc Tracker
31. HEAP SNAPSHOT
32. Eclipse MAT
33. Call GC Dump Heap Alloc Tracker
35. Memory Tips Bitmap’s pixel format HashMap vs. ArrayMap / Sparse*Array Context Awareness
36. LeakCanary
37. GPU Profiling
43. < <=
44. adb shell dumpsys gfxinfo <pkg name> <=
46. Hierarchy Viewer
48. Render times •Measure, Layout and Draw. •For the view and its children
49. Measure Performance Indicators Layout Draw Green: view is in the faster 50% Yellow: view is in the slower 50% Red: view is the slowest in the tree
50. Overdraw
52. 1x Overdraw 2x Overdraw 3x Overdraw 4x Overdraw+ No Overdraw
53. Too much..
54. Alpha
55. setAlpha() ALPHA The direct approach
56. setAlpha() ALPHA The complex approach
57. Alpha Tips TextView setTextColor() instead of setAlpha() ImageView setImageAlpha() instead of setAlpha() Custom Views Handle alpha yourself by overriding onSetAlpha() Override hasOverlappingRendering()
58. Hardware Acceleration
59. Using Hardware Layers OR
60. EXAMPLE HW LAYERS
61. View Pager ! Parallax effect for the pages background ! Views in the page are moved as we scroll pages
62. Enabling “Show hardware layers updates”
64. Small hack to disable HW layers for ViewPager pages
65. More
66. More Resources Android Performance Patterns playlist on YouTube My blog: http://www.udinic.com Android Performance Patterns Google+ community (#PerfMatters)
67. Thank you! @udinic +UdiCohen www.udinic.com Udi Cohen