PERFMATTERS for Android - DroidCon Turin 2016

PERFMATTERS for Android - DroidCon Turin 2016

The slogan '#PERFMATTERS' by Colt McAnlis is one of the most important statements, which an Android developer should follow. A well performing application makes the difference between a nice looking application and one, which gets successful. You, as an Android developer, have the responsibility to delight your users, so they don't feel how much work your application has to burden to fulfill the user's needs. This session will show you some easy optimizations and how to avoid glitches in the application. A lot of developers would shout, that this is premature optimization. In contrary it is preventive. With a small amount of work while developing you can avoid a lot of pitfalls. You will hopefully have a better understanding of the underlying system afterwards. During the session some tools and frameworks will be presented for helping you to fulfill your mission.

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Hasan Hosgel

April 07, 2016
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Transcript

  1. www.immobilienscout24.de Hasan Hosgel – Droidcon Turin 2016 #PERFMATTERS for Android

  2. #PERFMATTERS for Android | Hasan Hosgel Immobilien Scout GmbH Location:

    Berlin Employees: ~ 520 > 850.000 ads per month > 787 M visits in 2014* > 6 M Android downloads *source: comScore Digital Analytix, January 2015, complete IS24 (Portal & Mobile)
  3. Why we are developers?

  4. Why we are developers? ESPECIALLY ANDROID

  5. Source: https://www.flickr.com/photos/theinfamousgdub/1765952198

  6. We are smart! Source: https://www.flickr.com/photos/theinfamousgdub/1765952198

  7. Source: http://giphy.com/gifs/apple-looney-tunes-android-4A41Wn7C32RiM

  8. We Love Android! Source: http://giphy.com/gifs/apple-looney-tunes-android-4A41Wn7C32RiM

  9. Source: Photo by Sujaki-F

  10. We have Passion! Source: Photo by Sujaki-F

  11. We have Passion! Source: Photo by Sujaki-F

  12. We have Passion! Source: Photo by Sujaki-F We Love Challenges

  13. Source: https://www.flickr.com/photos/68751915@N05/6793826885

  14. We Love Money Source: https://www.flickr.com/photos/68751915@N05/6793826885

  15. Source: http://agenciabrasil.ebc.com.br/geral/foto/2014-07/cerimonia-de-premiacao-da-copa-do-mundo-no-brasil

  16. We love to delight our users Source: http://agenciabrasil.ebc.com.br/geral/foto/2014-07/cerimonia-de-premiacao-da-copa-do-mundo-no-brasil

  17. User Expectations

  18. User Expectations Mobile App Users are impatient Source: https://ssl.www8.hp.com/ww/en/secure/pdf/4aa5-7696enw.pdf

  19. User Expectations Mobile App Users are impatient •  61% app

    start < 4 s Source: https://ssl.www8.hp.com/ww/en/secure/pdf/4aa5-7696enw.pdf
  20. User Expectations Mobile App Users are impatient •  61% app

    start < 4 s •  49% app start < 2 s Source: https://ssl.www8.hp.com/ww/en/secure/pdf/4aa5-7696enw.pdf
  21. User Expectations Mobile App Users are impatient •  61% app

    start < 4 s •  49% app start < 2 s Users are intolerant of issues and are quick to uninstall mobile apps Source: https://ssl.www8.hp.com/ww/en/secure/pdf/4aa5-7696enw.pdf
  22. User Expectations Mobile App Users are impatient •  61% app

    start < 4 s •  49% app start < 2 s Users are intolerant of issues and are quick to uninstall mobile apps •  80% three attempts or less Source: https://ssl.www8.hp.com/ww/en/secure/pdf/4aa5-7696enw.pdf
  23. User Expectations Mobile App Users are impatient •  61% app

    start < 4 s •  49% app start < 2 s Users are intolerant of issues and are quick to uninstall mobile apps •  80% three attempts or less •  53% apps with severe issues like crashes, freezes or errors Source: https://ssl.www8.hp.com/ww/en/secure/pdf/4aa5-7696enw.pdf
  24. User Expectations Mobile App Users are impatient •  61% app

    start < 4 s •  49% app start < 2 s Users are intolerant of issues and are quick to uninstall mobile apps •  80% three attempts or less •  53% apps with severe issues like crashes, freezes or errors •  36% heavy battery usage Source: https://ssl.www8.hp.com/ww/en/secure/pdf/4aa5-7696enw.pdf
  25. User Expectations Source: https://ssl.www8.hp.com/ww/en/secure/pdf/4aa5-7696enw.pdf

  26. User Expectations Users blame the app and the company who

    made it Source: https://ssl.www8.hp.com/ww/en/secure/pdf/4aa5-7696enw.pdf
  27. User Expectations Users blame the app and the company who

    made it •  55% app is responsible for performance issues Source: https://ssl.www8.hp.com/ww/en/secure/pdf/4aa5-7696enw.pdf
  28. User Expectations Users blame the app and the company who

    made it •  55% app is responsible for performance issues •  37% Stated that app crashes or errors make them think less of a company’s brand Source: https://ssl.www8.hp.com/ww/en/secure/pdf/4aa5-7696enw.pdf
  29. Performance Impacts

  30. Performance Impacts 500 ms delay Source: http://www.mobilejoomla.com/media/press/responsive-vs-serverside/Responsive-Design-vs- Server-Side-Solutions-Infographic.jpg

  31. Performance Impacts 500 ms delay bounce rate -4.7% -- conversion

    rate -1.9% Source: http://www.mobilejoomla.com/media/press/responsive-vs-serverside/Responsive-Design-vs- Server-Side-Solutions-Infographic.jpg
  32. Performance Impacts 500 ms delay bounce rate -4.7% -- conversion

    rate -1.9% 1,000 ms delay Source: http://www.mobilejoomla.com/media/press/responsive-vs-serverside/Responsive-Design-vs- Server-Side-Solutions-Infographic.jpg
  33. Performance Impacts 500 ms delay bounce rate -4.7% -- conversion

    rate -1.9% 1,000 ms delay bounce rate -8.3% -- Conversion rate -3.5% Source: http://www.mobilejoomla.com/media/press/responsive-vs-serverside/Responsive-Design-vs- Server-Side-Solutions-Infographic.jpg
  34. Performance Impacts 500 ms delay bounce rate -4.7% -- conversion

    rate -1.9% 1,000 ms delay bounce rate -8.3% -- Conversion rate -3.5% 100ms delay mean for Amazon -1% revenue Source: http://www.mobilejoomla.com/media/press/responsive-vs-serverside/Responsive-Design-vs- Server-Side-Solutions-Infographic.jpg
  35. Performance Impacts 500 ms delay bounce rate -4.7% -- conversion

    rate -1.9% 1,000 ms delay bounce rate -8.3% -- Conversion rate -3.5% 100ms delay mean for Amazon -1% revenue 11% scream at there device Source: http://www.mobilejoomla.com/media/press/responsive-vs-serverside/Responsive-Design-vs- Server-Side-Solutions-Infographic.jpg
  36. Performance Impacts 500 ms delay bounce rate -4.7% -- conversion

    rate -1.9% 1,000 ms delay bounce rate -8.3% -- Conversion rate -3.5% 100ms delay mean for Amazon -1% revenue 11% scream at there device 4 % throw their phones Source: http://www.mobilejoomla.com/media/press/responsive-vs-serverside/Responsive-Design-vs- Server-Side-Solutions-Infographic.jpg https://www.flickr.com/photos/ 9009139@N08/1263954439
  37. None
  38. Source: http://giphy.com/gifs/sad-kawaii-pretty-10XOyCb09KyjLy

  39. www.immobilienscout24.de Let‘s find some performance improvements

  40. Possible improvements CPU Memory I/O

  41. Possible improvements CPU Memory I/O

  42. Possible improvements CPU Memory I/O •  Keep the work of

    the main thread ! ANR
  43. Possible improvements CPU Memory I/O •  Keep the work of

    the main thread ! ANR •  Avoid GPU overdrawings • https://www.youtube.com/ watch?v=T52v50r-JfE
  44. Possible improvements CPU Memory I/O •  Keep the work of

    the main thread ! ANR •  Avoid GPU overdrawings • https://www.youtube.com/ watch?v=T52v50r-JfE •  Avoid nested multi-pass layouts • http://goo.gl/Q5te24
  45. Possible improvements CPU Memory I/O •  Keep the work of

    the main thread ! ANR •  Avoid GPU overdrawings • https://www.youtube.com/ watch?v=T52v50r-JfE •  Avoid nested multi-pass layouts • http://goo.gl/Q5te24 •  Consider RenderScript for performance critical code
  46. Possible improvements CPU Memory I/O

  47. Possible improvements CPU Memory I/O •  Do not allocate memory

    inside onDraw()
  48. Possible improvements CPU Memory I/O •  Do not allocate memory

    inside onDraw() •  Avoid Leaks
  49. LeakCanary to the Rescue https://github.com/square/ leakcanary

  50. Setup LeakCanary debugCompile 'com.squareup.leakcanary:leakcanary-android:1.3.1' releaseCompile 'com.squareup.leakcanary:leakcanary-android-no-op:1.3.1’ build.gradle public class DcItApplication

    extends Application { @Override public void onCreate() { super.onCreate(); LeakCanary.install(this); } } DcItApplication.java
  51. Use Your Debug Build Normally

  52. Analyze Memory

  53. Analyze Heap Dump

  54. Analyze Heap Dump

  55. Analyze Heap Dump since AS 1.5

  56. Analyze Memory

  57. Possible improvements CPU Memory I/O •  Do not allocate memory

    inside onDraw() •  Avoid Leaks •  Avoid listener ! EventBus
  58. Possible improvements CPU Memory I/O •  Do not allocate memory

    inside onDraw() •  Avoid Leaks •  Avoid listener ! EventBus •  Use SparseArray* family instead of JDK Collections/ Maps
  59. Possible improvements CPU Memory I/O •  Do not allocate memory

    inside onDraw() •  Avoid Leaks •  Avoid listener ! EventBus •  Use SparseArray* family instead of JDK Collections/ Maps •  Be aware that enums need more resource, but use them, if it will make sense for you
  60. Possible improvements CPU Memory I/O

  61. Possible improvements CPU Memory I/O •  Activate gzip compression on

    incoming and outgoing network traffic or FlatBuffer
  62. Analyze First Start

  63. Analyze Second Start

  64. Analyze Second Start

  65. Possible improvements CPU Memory I/O •  Activate gzip compression on

    incoming and outgoing network traffic or FlatBuffer •  Cache data on disk (image, http responses) with reasonable TTL
  66. Finally Second Start

  67. Possible improvements CPU Memory I/O •  Activate gzip compression on

    incoming and outgoing network traffic or FlatBuffer •  Cache data on disk (image, http responses) with reasonable TTL •  Server side cache headers like ETag & Last-Modified
  68. Possible improvements CPU Memory I/O •  Activate gzip compression on

    incoming and outgoing network traffic or FlatBuffer •  Cache data on disk (image, http responses) with reasonable TTL •  Server side cache headers like ETag & Last-Modified •  Use JobScheduler API to batch across system or better use push notifications for update information
  69. Source: http://www.flickr.com/photos/16210667@N02/9172895225

  70. Optimizing ArrayList

  71. Optimizing ArrayList public List<String> getDcItNames(List<Attendee> attendees) { List<String> names =

    new ArrayList<>(); for (Attendee attendee : attendees) { names.add(attendee.name); } return names; } JAVA
  72. Optimizing ArrayList public List<String> getDcItNames(List<Attendee> attendees) { List<String> names =

    new ArrayList<>(attendees.size()); for (Attendee attendee : attendees) { names.add(attendee.name); } return names; } JAVA
  73. Optimizing ArrayList @Override public boolean add(E object) { Object[] a

    = array; int s = size; if (s == a.length) { Object[] newArray = new Object[s + (s < (MIN_CAPACITY_INCREMENT / 2) ? MIN_CAPACITY_INCREMENT : s >> 1)]; System.arraycopy(a, 0, newArray, 0, s); array = a = newArray; } a[s] = object; size = s + 1; modCount++; return true; } JAVA
  74. Optimizing ArrayList void addDcItSpeaker(ArrayList<String> attendees, List<String> speakers) { for (String

    speaker : speakers) { attendees.add(speaker); } } JAVA
  75. Optimizing ArrayList void addDcItSpeaker(ArrayList<String> attendees, List<String> speakers) { attendees.ensureCapacity(attendees.size() +

    speakers.size()); for (String speaker : speakers) { attendees.add(speaker); } } JAVA
  76. Optimizing Bundle

  77. Optimizing Bundle public static DcItScheduleFragment instance(int startMode) { final DcItScheduleFragment

    fragment = new DcItScheduleFragment(); final Bundle bundle = new Bundle(); bundle.putInt(START_MODE, startMode); fragment.setArguments(bundle); return fragment; } JAVA
  78. Optimizing Bundle public static DcItScheduleFragment instance(int startMode) { final DcItScheduleFragment

    fragment = new DcItScheduleFragment(); final Bundle bundle = new Bundle(1); bundle.putInt(START_MODE, startMode); fragment.setArguments(bundle); return fragment; } JAVA
  79. Optimizing StringBuilder

  80. Optimizing StringBuilder public StringBuilder getDcItNames(List<String> names) { StringBuilder builder =

    new StringBuilder(); for (String name : names) { if (builder.length() > 0) { builder.append(", "); } builder.append(name); } return builder; } JAVA
  81. Optimizing StringBuilder public StringBuilder getDcItNames(List<String> names) { StringBuilder builder =

    new StringBuilder(names.size() * 13); for (String name : names) { if (builder.length() > 0) { builder.append(", "); } builder.append(name); } return builder; } JAVA
  82. Optimizing StringBuilder final void append0(char[] chars) { int newCount =

    count + chars.length; if (newCount > value.length) { enlargeBuffer(newCount); } System.arraycopy(chars, 0, value, count, chars.length); count = newCount; } JAVA
  83. Optimizing StringBuilder public StringBuilder addDcItOrganizer(StringBuilder names, List<String> organizers) { names.ensureCapacity(names.length()

    + organizers.size() * 13); for (String organizer : organizers) { if (names.length() > 0) { names.append(", "); } names.append(organizer); } } JAVA
  84. Optimizing Loops

  85. Optimizing Moar – The Loop public StringBuilder addDcItOrganizer(StringBuilder names, List<String>

    organizers) { names.ensureCapacity(names.length() + organizers.size() * 13); for (String organizer : organizers) { if (names.length() > 0) { names.append(", "); } names.append(organizer); } } JAVA
  86. Optimizing Moar – The Loop public StringBuilder addDcItOrganizer(StringBuilder names, List<String>

    organizers) { names.ensureCapacity(names.length() + organizers.size() * 13); for (int i = 0; i < organizers.size(); i++) { String organizer = organizers.get(i); if (names.length() > 0) { names.append(", "); } names.append(organizer); } } JAVA
  87. Optimizing Moar – The Loop public StringBuilder addDcItOrganizer(StringBuilder names, List<String>

    organizers) { names.ensureCapacity(names.length() + organizers.size() * 13); for (int i = 0, organizersSize = organizers.size(); i < organizersSize; i++) { String organizer = organizers.get(i); if (names.length() > 0) { names.append(", "); } names.append(organizer); } } JAVA
  88. Optimizing Moar – The Loop public StringBuilder addDcItOrganizer(StringBuilder names, List<String>

    organizers) { final int size = organizers.size(); names.ensureCapacity(names.length() + size * 13); for (int i = 0; i < size; i++) { String organizer = organizers.get(i); if (names.length() > 0) { names.append(", "); } names.append(organizer); } } JAVA
  89. Optimizing Method invocations

  90. Optimizing Much Moar – Method Invocation public void onViewCreated(View view,

    Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); text.setTextColor(attendee.isOrganizer() ? getResources().getColor(R.color.accent) : getResources().getColor(R.color.black)); avatar.setImageResource(attendee.getAvatar()); welcomeText.setText(getString( R.string.hello_world, attendee.name)); } JAVA
  91. Optimizing Much Moar – Method Invocation public void onViewCreated(View view,

    Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); final Resources res = getResources(); text.setTextColor(attendee.isOrganizer() ? res.getColor(R.color.accent) : res.getColor(R.color.black)); avatar.setImageResource(attendee.getAvatar()); welcomeText.setText(getString( R.string.hello_world, attendee.name)); } JAVA
  92. Optimizing Much Moar – Method Invocation public void onViewCreated(View view,

    Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); final Resources res = getResources(); text.setTextColor(attendee.isOrganizer() ? res.getColor(R.color.accent) : res.getColor(R.color.black)); avatar.setImageResource(attendee.getAvatar()); welcomeText.setText(res.getString( R.string.hello_world, attendee.name)); } JAVA
  93. Optimizing Access Methods

  94. Optimizing Access Methods private Attendee attendee; public void onViewCreated(View view,

    Bundle savedInstanceState) { button.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { makeText(getContext(), getWelcomeTextFor(attendee.getName()), LENGTH_SHORT).show(); } }); } private String getWelcomeTextFor(String name) { return getResources().getString(R.string.welcome_text, name); } JAVA
  95. Finding Access Methods https://github.com/JakeWharton/dex-method-list $ ./build/dex-method-list src/test/resources/one.apk … package.DcItScheduleFragment access$000(DcItScheduleFragment

    ) package.DcItScheduleFragment access$100(DcItScheduleFragment , String) … CL
  96. Optimizing Access Methods Attendee attendee; public void onViewCreated(View view, Bundle

    savedInstanceState) { button.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { makeText(getContext(), getWelcomeTextFor(attendee.getName()), LENGTH_SHORT).show(); } }); } String getWelcomeTextFor(String name) { return getResources().getString(R.string.welcome_text, name); } JAVA
  97. Source: https://www.flickr.com/photos/marcus_t_ward/10715983613

  98. Source: http://www.bhmpics.com/success_kid-wallpapers.html

  99. Source: http://www.flickr.com/photos/21496790@N06/5065834411/

  100. www.immobilienscout24.de Contact: +HasanHosgel alosdev Thanks for attending! We are Hiring!

    http://www.immobilienscout24.de/jobs https://speakerdeck.com/alosdev/perfmatters-for-android- droidcon-turin-2016
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  105. www.immobilienscout24.de Contact: +HasanHosgel alosdev Thanks for attending! We are Hiring!

    http://www.immobilienscout24.de/jobs https://speakerdeck.com/alosdev/perfmatters-for-android- droidcon-turin-2016
  106. Sources •  https://ssl.www8.hp.com/ww/en/secure/pdf/4aa5-7696enw.pdf •  http://www.mobilejoomla.com/media/press/responsive-vs- serverside/Responsive-Design-vs-Server-Side-Solutions- Infographic.jpg •  https://speakerdeck.com/jakewharton/eliminating-code-overhead- square-hq-2015

    •  http://periplanisi.com/android/2013/11/multi-pass-viewgroup- and-performance/ •  https://slideshare.net/dougsillars/android-app-performance- europe-2015 •  https://www.youtube.com/playlist? list=PLWz5rJ2EKKc9CBxr3BVjPTPoDPLdPIFCE