際際滷

際際滷Share a Scribd company logo

Android app to the challenge

Udi Cohen
Udi Cohen

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

1 of 25
Android App to the challenge Udi Cohen
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
whoami
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
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
Over Draw Happens to the best of us
Tracer for OpenGL Layout tree step by step See redundant draw operations Heavy
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
Hierarchy Viewer
Traceview Profiling Performance of each method Graphical interface Run from DDMS or code
Traceview Profiling
Traceview Profiling Inclusive: Includes child functions Exclusive: This function only
Traceview Profiling
Traceview Profiling So...what's the problem here?
Helping out the GC Allocation Tracker (DDMS)
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
Helping out the GC Eclipse MAT (Memory Analyzer Tool)
Helping out the GC Histogram & Dominator tree
Tips - Bitmaps InJustDecodeBounds Load only properties InBitmap reuse other allocation InSampleSize good for preview Resource folders
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)
Log EventLog Adb logcat -b events Framework level logs DB and system operations
Hardware Acceleration android:hardwareAccelerated="true" or targetApi >= 14 Efficient drawing model Compatibility issues Custom views Unsupported operations
Hardware Acceleration Good for animations View Layers
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
@udinic http://www.udinic.com udi@udinic.com Thank you

More Related Content

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
  • 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
  • 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