Preparing your app for the next billion internet users - Assaf Gelber, Facebook
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As presented in Droidcon Tel Aviv 2017: http://il.droidcon.com
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Preparing your app for the next billion internet users - Assaf Gelber, Facebook
- 1. Preparing your app for the next billion internet users Assaf Gelber Droidcon Tel-Aviv 2017
- 2. Assaf Gelber
- 3. Facebook
- 5. You are all a very special group of people
- 6. Kotlin VS API level 9
- 7. Why I'm here
- 8. • Convince you that you should care • Explain why this is a hard problem • Discuss high-level tips and directions • Answer your questions
- 9. Agenda
- 10. • Why you should care • Why it's hard • What you can do about it
- 11. • Why you should care • Why it's hard • What you can do about it
- 12. Let's play a game!
- 13. • 1080x1920 pixel display • 128 GB internal storage • 4 GB RAM • 8 core 2.35 GHz/1.9 GHz CPU • $749
- 14. Google Pixel 2 Released: 2017
- 15. • 540x960 pixel display • 16 GB internal storage • 1 GB RAM • 4 core 1.2 GHz CPU • Around $250
- 16. Samsung Galaxy A3 Released: 2017
- 17. • 720x1280 pixel display • 16 GB internal storage • 2 GB RAM • 4 core 1.3 GHz CPU • Around $100
- 18. InFocus Turbo 5 Released: 2017
- 19. • 480x854 pixel display • 4 GB internal storage • 512 MB RAM • 4 core 1.3 GHz CPU • Around $42
- 20. Swipe Neo Power Released: 2017
- 21. And they are here to stay
- 22. So how can we reason about them?
- 24. In what year would this have been a high-end device?
- 25. Google Pixel 2 Year class: 2015
- 26. Samsung Galaxy A3 Year class: 2011
- 27. InFocus Turbo 5 Year class: 2012
- 28. Swipe Neo Power Year class: 2010
- 29. Let's look at data
- 30. Year class distribution in Africa 2009 2010 2011 2012 2013 2014 2015
- 31. Year class distribution in South America 2009 2010 2011 2012 2013 2014 2015
- 32. Year class distribution in Asia 2009 2010 2011 2012 2013 2014 2015
- 33. Year class distribution in Europe 2009 2010 2011 2012 2013 2014 2015
- 34. Year class distribution overall 2009 2010 2011 2012 2013 2014 2015
- 35. Over 50% of people worldwide are on 2012 and under!
- 36. Let's look at networks
- 37. Percent of users on 2G networks India Africa S. America Middle East Europe N. America 77% 67% 38% 52% 26% 10% Source: GSMA Intelligence - Global Mobile Trends 2017
- 38. 36% are on 2G overall Source: GSMA Intelligence - Global Mobile Trends 2017
- 39. But not all networks are created equal
- 40. And not all data packages are priced equal
- 41. Let's look at new users
- 42. Emerging markets will account for over 90% of new mobile subscribers globally by 2020 Source: GSMA Intelligence - Global Mobile Trends 2017
- 43. But do I reaaalllly need to build for them?
- 44. Yes!
- 45. Yes! Well, kind of.
- 46. • Why you should care • Why it's hard • What you can do about it
- 47. • Old devices are old • New devices are also old
- 48. Usage is completely different
- 49. • Turn off data when not in use • Save content when on WiFi for later • Install apps by sharing APKs over bluetooth
- 50. Design for new users
- 51. Let's play another game!
- 54. Round 2
- 57. Designing for new internet users is hard
- 58. Designing for flaky networks and devices is also hard
- 59. • Why you should care • Why it's hard • What you can do about it
- 60. One simple rule
- 62. Easy, right?
- 63. Allow me to expand
- 64. • APK size • Storage and caches • Runtime perf • Network
- 65. Let's talk about Facebook Lite
- 66. Client ͍ Proxy ͍ Server
- 67. • Client connects to a proxy • Proxy knows everything • Proxy does everything
- 68. Client is very thin
- 69. • APK size • Storage and caches • Runtime perf • Network
- 70. Quite easy to measure and monitor
- 71. Important for a number of reasons
- 72. • Mobile data availability • Network failures • Size on disk
- 73. Use these:
- 74. • ProGuard minification & dead code • ReDex dex optimizing • Resource shrinking • Multiple APKs
- 75. Consider these:
- 76. • Vector drawables • Downloadable fonts • Alternative build systems
- 77. Facebook Lite?
- 78. Almost no resources in APK
- 79. No Optimizations 8.1 MB With Optimizations 1.6 MB
- 80. • APK size • Storage and caches • Runtime perf • Network
- 81. Measuring used to require ugly hacks
- 82. StorageStatsManager solves that in API 26 ¯_( )_/¯
- 83. Users are very aware of what is on their device
- 84. • Make downloaded content easily clearable • Be prepared for data to be cleared • Sometimes server-side state makes sense
- 85. Facebook Lite?
- 86. • Proxy is aware of what the client saves • Sends diffs when necessary • Clears things that aren't necessary anymore
- 87. • APK size • Storage and caches • Runtime perf • Network
- 88. Android GO!
- 89. Android Profiler is awesome
- 91. Find the correct time to run your code
- 92. Lazy loading is your friend
- 93. But not a silver bullet
- 94. Facebook Lite?
- 95. A lot of wins came from finding the correct times to execute
- 96. • APK size • Storage and caches • Runtime perf • Network
- 97. Measuring requires a bit of effort
- 99. Usually easier from server
- 100. In most cases, images dominate network traffic.
- 101. • Scale images to the required size • Pick the correct image format • Find the right time to send images
- 104. Size Weight 1280x960 325 KB 480x360 57 KB
- 105. 82 percent less data!
- 106. Down to 36KB when converting to high-quality WebP
- 108. • Don't use JSON • Don't use JSON • Don't use XML
- 109. Play around with network situation emulators
- 110. Try Augmented Traffic Control if you want more control
- 111. Facebook Lite?
- 112. • Very diligent about what we send • Very diligent about when we send it • Use custom protocol and compress it
- 113. Your mileage may vary, of course
- 114. A B C
- 116. Be part of this growth and help new internet users
- 117. Thank you! Assaf Gelber Droidcon Tel-Aviv 2017