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