Android app to the challenge
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Writing an Android app is easy, but making it "smooth" is not always simple. The UX demands and over 1000 different Android devices present a big challenge for any new and existing app. Learn some methods to optimize your app an make it up to the challenge
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Android app to the challenge
- 1. Android App to the challenge Udi Cohen
- 2. We'll talk about.. ● Graphics: – Over Draw – Detect UI glitches – Optimizing layouts with HierarchyViewer ● Profiling with Traceview ● Helping the GC with HPROF ● Playing tough with StrictMode ● Getting intimate with the OS using EventLog ● Hardware Accelerate your app ● Tips
- 3. whoami
- 4. Over Draw ● Draw something on top of something else 4x ● Rule – aim overdraw to 2x 3x ● Could indicate a complex 2x hierarchy ● “Show GPU overdraws” on Developer options (4.2+) 1x
- 5. Over Draw – Solutions ● Remove default background ● getWindow().setBackgroundDrawable(null) ● <item name="android:windowBackground">@null </item> ● Transparent regions in 9patches ● Use tools ● Tracer for OpenGL ● Hierarchy Viewer
- 6. Over Draw Happens to the best of us
- 7. Tracer for OpenGL ● Layout tree step by step ● See redundant draw operations ● Heavy
- 8. Dumpsys gfxinfo ● Since Jelly Bean ● Last 128 frames ● Frame < 16ms ● 3 columns – Draw – Process 9 8 7 – Execute 6 5 Execute 4 Process ● 3 Draw 2 1 0 5 13 21 29 37 45 53 61 69 77 85 93 101 109 117 125 1 9 17 25 33 41 49 57 65 73 81 89 97 105 113 121
- 10. Traceview Profiling ● Performance of each method ● Graphical interface ● Run from DDMS or code
- 12. Traceview Profiling Inclusive: Includes child functions Exclusive: This function only
- 14. Traceview Profiling So...what's the problem here?
- 15. Helping out the GC ● Allocation Tracker (DDMS) ●
- 16. Helping out the GC ● Memory profiling → Dalvik HPROF file Use code or DDMS ● Use hprof-conv to convert to standard ● Use any Java HPROF analyzer
- 17. Helping out the GC ● Eclipse MAT (Memory Analyzer Tool)
- 18. Helping out the GC ● Histogram & Dominator tree
- 19. Tips - Bitmaps ● InJustDecodeBounds – Load only properties ● InBitmap – reuse other allocation ● InSampleSize – good for preview ● Resource folders
- 20. StrictMode ● Problems Detector ● Single thread or the entire VM ● Show dialog, write to Log and more.. ● Usually used to detect slow operations on UI thread ● Came with Gingerbread (2.3)
- 21. Log ● EventLog – Adb logcat -b events – Framework level logs – DB and system operations
- 22. Hardware Acceleration ● android:hardwareAccelerated="true" or targetApi >= 14 ● Efficient drawing model ● Compatibility issues – Custom views – Unsupported operations
- 23. Hardware Acceleration ● Good for animations ● View Layers
- 24. Tips ● Always Measure ● Lint – Comes with the SDK – Scan the project's for optimizations – Great Eclipse/IntelliJ integration ● ListView – Easy on the getView() ● Alpha – Watch it... ● Storage Read/Write ● Direct access inside the class (!Get/Set) ● SQLite indexes
- 25. @udinic http://www.udinic.com udi@udinic.com Thank you