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Preparing your app for the next billion internet users - Assaf Gelber, Facebook
The document discusses preparing mobile apps for users in developing markets who have older devices and slower network connections. It recommends measuring app size, storage usage, performance, and network usage. Specific tips include using ProGuard and other tools to minimize app size, lazy loading images only when needed, scaling images appropriately for networks, and considering custom protocols and serialization formats to reduce data usage. Case studies of Facebook Lite are provided as an example of optimizing for these users through techniques like minimal app resources, downloading only necessary data from a proxy server, and diligent measurement of performance and network usage.
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Preparing your app for the next billion internet users - Assaf Gelber, Facebook
- 1. Preparing your appfor the next billion internet users Assaf Gelber Droidcon Tel-Aviv 2017
- 2.
- 3.
- 4.
- 5. You are alla very special group of people
- 6. Kotlin VS APIlevel 9
- 7.
- 8. • Convince youthat you should care • Explain why this is a hard problem • Discuss high-level tips and directions • Answer your questions
- 9.
- 10. • Why youshould care • Why it's hard • What you can do about it
- 11. • Why youshould care • Why it's hard • What you can do about it
- 12. Let's play agame!
- 13. • 1080x1920 pixeldisplay • 128 GB internal storage • 4 GB RAM • 8 core 2.35 GHz/1.9 GHz CPU • $749
- 14.
- 15. • 540x960 pixeldisplay • 16 GB internal storage • 1 GB RAM • 4 core 1.2 GHz CPU • Around $250
- 16.
- 17. • 720x1280 pixeldisplay • 16 GB internal storage • 2 GB RAM • 4 core 1.3 GHz CPU • Around $100
- 18.
- 19. • 480x854 pixeldisplay • 4 GB internal storage • 512 MB RAM • 4 core 1.3 GHz CPU • Around $42
- 20.
- 21. And they arehere to stay
- 22. So how canwe reason about them?
- 23.
- 24. In what yearwould this have been a high-end device?
- 25. Google Pixel 2 Yearclass: 2015
- 26. Samsung Galaxy A3 Yearclass: 2011
- 27. InFocus Turbo 5 Yearclass: 2012
- 28. Swipe Neo Power Yearclass: 2010
- 29. Let's look atdata
- 30. Year class distributionin Africa 2009 2010 2011 2012 2013 2014 2015
- 31. Year class distributionin South America 2009 2010 2011 2012 2013 2014 2015
- 32. Year class distributionin Asia 2009 2010 2011 2012 2013 2014 2015
- 33. Year class distributionin Europe 2009 2010 2011 2012 2013 2014 2015
- 34. Year class distributionoverall 2009 2010 2011 2012 2013 2014 2015
- 35. Over 50% ofpeople worldwide are on 2012 and under!
- 36. Let's look atnetworks
- 37. Percent of userson 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 on2G overall Source: GSMA Intelligence - Global Mobile Trends 2017
- 39. But not allnetworks are created equal
- 40. And not alldata packages are priced equal
- 41. Let's look atnew users
- 42. Emerging markets willaccount for over 90% of new mobile subscribers globally by 2020 Source: GSMA Intelligence - Global Mobile Trends 2017
- 43. But do Ireaaalllly need to build for them?
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- 45.
- 46. • Why youshould care • Why it's hard • What you can do about it
- 47. • Old devicesare old • New devices are also old
- 48. Usage is completelydifferent
- 49. • Turn offdata when not in use • Save content when on WiFi for later • Install apps by sharing APKs over bluetooth
- 50. Design for newusers
- 51. Let's play anothergame!
- 54.
- 57. Designing for newinternet users is hard
- 58. Designing for flakynetworks and devices is also hard
- 59. • Why youshould care • Why it's hard • What you can do about it
- 60.
- 61.
- 62.
- 63. Allow me toexpand
- 64. • APK size •Storage and caches • Runtime perf • Network
- 65. Let's talk aboutFacebook Lite
- 66. Client ͍ Proxy͍ Server
- 67. • Client connectsto a proxy • Proxy knows everything • Proxy does everything
- 68. Client is verythin
- 69. • APK size •Storage and caches • Runtime perf • Network
- 70. Quite easy tomeasure and monitor
- 71. Important for anumber of reasons
- 72. • Mobile dataavailability • Network failures • Size on disk
- 73.
- 74. • ProGuard minification& dead code • ReDex dex optimizing • Resource shrinking • Multiple APKs
- 75.
- 76. • Vector drawables •Downloadable fonts • Alternative build systems
- 77.
- 78. Almost no resourcesin APK
- 79. No Optimizations 8.1MB With Optimizations 1.6 MB
- 80. • APK size •Storage and caches • Runtime perf • Network
- 81. Measuring used torequire ugly hacks
- 82. StorageStatsManager solves that inAPI 26 ¯_( )_/¯
- 83. Users are veryaware of what is on their device
- 84. • Make downloadedcontent easily clearable • Be prepared for data to be cleared • Sometimes server-side state makes sense
- 85.
- 86. • Proxy isaware 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.
- 89. Android Profiler isawesome
- 90.
- 91. Find the correcttime to run your code
- 92. Lazy loading isyour friend
- 93. But not asilver bullet
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- 95. A lot ofwins came from finding the correct times to execute
- 96. • APK size •Storage and caches • Runtime perf • Network
- 97. Measuring requires abit of effort
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- 99. Usually easier fromserver
- 100. In most cases,images dominate network traffic.
- 101. • Scale imagesto the required size • Pick the correct image format • Find the right time to send images
- 104. Size Weight 1280x960 325KB 480x360 57 KB
- 105. 82 percent lessdata!
- 106. Down to 36KBwhen converting to high-quality WebP
- 107.
- 108. • Don't useJSON • Don't use JSON • Don't use XML
- 109. Play around withnetwork situation emulators
- 110. Try Augmented TrafficControl if you want more control
- 111.
- 112. • Very diligentabout what we send • Very diligent about when we send it • Use custom protocol and compress it
- 113. Your mileage mayvary, of course
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- 115.
- 116. Be part ofthis growth and help new internet users
- 117. Thank you! Assaf Gelber DroidconTel-Aviv 2017
- 118.