Secure Development with Android (Enrique Lopez Manas Technology Stream)
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The document outlines strategies for achieving high performance in Android applications, focusing on aspects like efficient software layout, memory management, and threading techniques. It emphasizes the importance of user engagement, costs, and quality, alongside best practices for networking. Key topics include avoiding memory leaks, managing background operations, and implementing caching to enhance app responsiveness.
![3 Important Limits
0.1s 1s 10s
[Miller 1968; Card et al. 1991]:](https://image.slidesharecdn.com/enriquelopezmanaslvivitarena-161028152945/85/Secure-Development-with-Android-Enrique-Lopez-Manas-Technology-Stream-6-320.jpg)
Secure Development with Android (Enrique Lopez Manas Technology Stream)
- 1. Android High Performance Enrique López Mañas Google Developer Expert & IT Consultor
- 2. Ego Slide • IT Consultor • Google Developer Expert • @eenriquelopez
- 3. Performance "how well a person, machine, etc. does a piece of work or an activity" Cambridge
- 4. But what is high performance? • Strategies to create efficient software Layout Energy and battery Security Multithreading Programming patterns Debugging techniques
- 5. Why is important? • User Engagement • Costs • Maintenance • Quality
- 6. 3 Important Limits 0.1s 1s 10s [Miller 1968; Card et al. 1991]:
- 7. What this means in Android? ANR
- 8. ANR • No response for input event in 5 seconds • BroadCast receiver still executing after 10 seconds
- 9. How to avoid it? Background operations? Show feedback!
- 10. How to avoid it? Splash Screen?
- 11. How to avoid it? Calculations? Worker thread!
- 12. How to avoid it? Systrace! TraceView!
- 13. Debug DDMS
- 14. Networking
- 15. Layouts TV: 24fps(NTSC), 25fps(PAL) New cam-coders / slow motion: 48fps+ Blur can occur! Apps: 60fps! every 16 ms!
- 16. Layouts
- 17. Layouts
- 18. Reusing layouts
- 19. Reusing layouts
- 20. Reusing layouts
- 22. ViewStub
- 23. Hierarchy Viewer
- 25. Profile GPU Rendering • Blue: draw • Purple: prepare • Red: process • Orange: execute
- 26. Memory “the ability to remember information, experiences, and people" Cambridge
- 31. Memory - Enumerations @IntDef
- 32. Memory - Enumerations @IntDef
- 33. Memory - Enumerations Summary • Unnecessary allocations • AVOID USING THEM • Change as much as possible with static final integer values
- 34. Memory - Constants Constants in the code should be static and final to take advantage of memory savings and to avoid initialization in Java compiler
- 35. Memory - Strings
- 36. Memory - Strings
- 37. Memory - Strings
- 38. Memory Leaks “a memory leak is a type of resource leak that occurs when a computer program incorrectly manages memory allocations in such a way that memory which is no longer needed is not released.” Wikipedia
- 39. Memory Leaks - static fields
- 40. Memory Leaks - static fields
- 41. Memory Leaks - non-static inner classes
- 42. Memory Leaks - WeakReference
- 43. Threading “Threading is a method of hair removal originating in Asia.” Wikipedia
- 44. Threading “is the smallest sequence of programmed instructions that can be managed independently by a scheduler” Wikipedia
- 45. Threading • AsyncTask • Loader • Threads… Know your war!
- 46. Threading - AsyncTask Communicate Worker Thread with UI Does not need to communicate UI? Does not need to notify user? DOES NOT NEED ASYNCTASK! If the AsyncTask has all parameters Void, you are only implementing doInBackground() and you do not need an AsyncTask
- 47. Threading - AsyncTaskLoader Use it to fetch data Same features as AsyncTask… …plus the Activity life-cycle independency and data caching
- 49. Threading - Services • Not threads! • Executed in UI Thread by default • Never start a long running operation! • Lifecycle
- 50. Threading - IntentService • Particular implementation of a Service • Execute sequential operations in background • Don’t need to handle the lifecycle
- 51. Networking “process of communication between different terminal nodes to exchange data” Me
- 52. Networking - best practices Latency Gauging
- 53. Networking - best practices Batch connections • Wait, collect and send • (Analytics)
- 54. Networking - best practices Pre-fetch • Download as much as possible • (specially if idle connection)
- 55. Networking - best practices Queuing connections
- 56. Networking - best practices Caching responses
- 57. Networking - best practices Last modified
- 58. Networking - best practices Exponential back-off
- 59. I want your feedback! http://bit.ly/droidConGR
- 60. #dfist