PERFMATTERS for Android - DevFest Istanbul 2015

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.

Transcript

1. Hasan Hosgel Android Developer @ Kitchen Stories anyone can cook #PERFMATTERS for Android
2. Hasan Hosgel #dfist Why we are developers?
3. Hasan Hosgel #dfist Why we are developers? ESPECIALLY ANDROID
4. Hasan Hosgel #dfist Source: https://www.flickr.com/photos/theinfamousgdub/1765952198 Source: https://www.flickr.com/photos/theinfamousgdub/1765952198
5. Hasan Hosgel #dfist We are smart! Source: https://www.flickr.com/photos/theinfamousgdub/1765952198 Source: https://www.flickr.com/photos/theinfamousgdub/1765952198
6. Hasan Hosgel #dfist
7. Hasan Hosgel #dfist We Love Android!
8. Hasan Hosgel #dfist Source: Photo by Sujaki-F
9. Hasan Hosgel #dfist We have Passion! Source: Photo by Sujaki-F
10. Hasan Hosgel #dfist We have Passion! Source: Photo by Sujaki-F
11. Hasan Hosgel #dfist We have Passion! Source: Photo by Sujaki-F We love challenges!
12. Hasan Hosgel #dfist Source: https://www.flickr.com/photos/68751915@N05/6793826885
13. Hasan Hosgel #dfist We love Money! Source: https://www.flickr.com/photos/68751915@N05/6793826885
14. Hasan Hosgel #dfist 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
15. Hasan Hosgel #dfist User Expectations Source: https://ssl.www8.hp.com/ww/en/secure/pdf/4aa5-7696enw.pdf
16. Hasan Hosgel #dfist User Expectations •  Mobile App Users are impatient Source: https://ssl.www8.hp.com/ww/en/secure/pdf/4aa5-7696enw.pdf
17. Hasan Hosgel #dfist 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
18. Hasan Hosgel #dfist 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
19. Hasan Hosgel #dfist 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
20. Hasan Hosgel #dfist 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
21. Hasan Hosgel #dfist 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
22. Hasan Hosgel #dfist 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
23. Hasan Hosgel #dfist 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
24. Hasan Hosgel #dfist 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
25. Hasan Hosgel #dfist 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
26. Hasan Hosgel #dfist Performance Impacts 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
27. Hasan Hosgel #dfist Performance Impacts •  500 ms delay 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
28. Hasan Hosgel #dfist 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 https://www.flickr.com/photos/9009139@N08/1263954439
29. Hasan Hosgel #dfist 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 https://www.flickr.com/photos/9009139@N08/1263954439
30. Hasan Hosgel #dfist 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 https://www.flickr.com/photos/9009139@N08/1263954439
31. Hasan Hosgel #dfist 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 https://www.flickr.com/photos/9009139@N08/1263954439
32. Hasan Hosgel #dfist 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 https://www.flickr.com/photos/9009139@N08/1263954439
33. Hasan Hosgel #dfist 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
34. Hasan Hosgel #dfist
35. Let‘s find some performance improvements
36. Hasan Hosgel #dfist Possible improvements CPU Memory I/O
37. Hasan Hosgel #dfist Possible improvements CPU Memory I/O
38. Hasan Hosgel #dfist Possible improvements CPU Memory I/O •  Keep the work of the main thread à ANR
39. Hasan Hosgel #dfist Possible improvements CPU Memory I/O •  Keep the work of the main thread à ANR •  Avoid GPU overdrawings
40. Hasan Hosgel #dfist Possible improvements CPU Memory I/O •  Keep the work of the main thread à ANR •  Avoid GPU overdrawings •  https://www.youtube.com/watch?v=T52v50r-JfE
41. Hasan Hosgel #dfist Possible improvements CPU Memory I/O •  Keep the work of the main thread à ANR •  Avoid GPU overdrawings •  https://www.youtube.com/watch?v=T52v50r-JfE •  Avoid nested multi-pass layouts
42. Hasan Hosgel #dfist Possible improvements CPU Memory I/O •  Keep the work of the main thread à ANR •  Avoid GPU overdrawings •  https://www.youtube.com/watch?v=T52v50r-JfE •  Avoid nested multi-pass layouts •  http://goo.gl/Q5te24
43. Hasan Hosgel #dfist Possible improvements CPU Memory I/O •  Keep the work of the main thread à 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
44. Hasan Hosgel #dfist Possible improvements CPU Memory I/O
45. Hasan Hosgel #dfist Possible improvements CPU Memory I/O •  Do not allocate memory inside onDraw()
46. Hasan Hosgel #dfist Possible improvements CPU Memory I/O •  Do not allocate memory inside onDraw() •  Avoid Leaks
47. Hasan Hosgel #dfist LeakCanary to the Rescue https://github.com/square/leakcanary
48. Hasan Hosgel #dfist 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 DFIstApplication extends Application {! @Override! public void onCreate() {! super.onCreate();! LeakCanary.install(this);! }! }! DFIstApplication.java
49. Hasan Hosgel #dfist Use Your Debug Build Normally
50. Hasan Hosgel #dfist Analyze Memory
51. Hasan Hosgel #dfist Analyze Heap Dump
52. Hasan Hosgel #dfist Analyze Heap Dump
53. Hasan Hosgel #dfist Analyze Heap Dump since AS 1.5
54. Hasan Hosgel #dfist Analyze Memory
55. Hasan Hosgel #dfist Possible improvements CPU Memory I/O •  Do not allocate memory inside onDraw() •  Avoid Leaks •  Avoid listener à EventBus
56. Hasan Hosgel #dfist Possible improvements CPU Memory I/O •  Do not allocate memory inside onDraw() •  Avoid Leaks •  Avoid listener à EventBus •  Use SparseArray* family instead of JDK Collections/ Maps
57. Hasan Hosgel #dfist Possible improvements CPU Memory I/O •  Do not allocate memory inside onDraw() •  Avoid Leaks •  Avoid listener à 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
58. Hasan Hosgel #dfist Possible improvements CPU Memory I/O
59. Hasan Hosgel #dfist Possible improvements CPU Memory I/O •  Activate gzip compression on incoming and outgoing network traffic or FlatBuffer
60. Hasan Hosgel #dfist Analyze First Start
61. Hasan Hosgel #dfist Analyze Second Start
62. Hasan Hosgel #dfist Analyze Second Start
63. Hasan Hosgel #dfist 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
64. Hasan Hosgel #dfist Finally Second Start
65. Hasan Hosgel #dfist 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
66. Hasan Hosgel #dfist 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 updateinformation
67. Hasan Hosgel #dfist Source: http://www.flickr.com/photos/16210667@N02/9172895225
68. Hasan Hosgel #dfist Optimizing ArrayList ! public List<String> getDFIstNames(List<Attendee> attendees) {! ! List<String> names = new ArrayList<>();! ! for (Attendee attendee : attendees) {! names.add(attendee.name);! }! ! return names;! }! ! JAVA
69. Hasan Hosgel #dfist Optimizing ArrayList ! public List<String> getDFIstNames(List<Attendee> attendees) {! ! List<String> names = new ArrayList<>(attendees.size());! ! for (Attendee attendee : attendees) {! names.add(attendee.name);! }! ! return names;! }! ! JAVA
70. Hasan Hosgel #dfist 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
72. Hasan Hosgel #dfist Optimizing ArrayList void addDFIstSpeaker(ArrayList<String> attendees, List<String> speakers) {! ! ! ! for (String speaker : speakers) {! attendees.add(speaker);! }! ! }! ! JAVA
73. Hasan Hosgel #dfist Optimizing ArrayList void addDFIstSpeaker(ArrayList<String> attendees, List<String> speakers) {! ! attendees.ensureCapacity(attendees.size() + speakers.size());! ! for (String speaker : speakers) {! attendees.add(speaker);! }! ! }! ! JAVA
75. Hasan Hosgel #dfist Optimizing Bundle public static DFIstScheduleFragment instance(int startMode) {! final DFIstScheduleFragment fragment = new DFIstScheduleFragment();! ! final Bundle bundle = new Bundle();! bundle.putInt(START_MODE, startMode);! fragment.setArguments(bundle);! ! return fragment;! }! ! JAVA
76. Hasan Hosgel #dfist Optimizing Bundle public static DFIstScheduleFragment instance(int startMode) {! final DFIstScheduleFragment fragment = new DFIstScheduleFragment();! ! final Bundle bundle = new Bundle(1);! bundle.putInt(START_MODE, startMode);! fragment.setArguments(bundle);! ! return fragment;! }! ! JAVA
78. Hasan Hosgel #dfist Optimizing StringBuilder public StringBuilder getDFIstNames(List<String> names) {! ! StringBuilder builder = new StringBuilder();! ! for (String name : names) {! if (builder.length() > 0) {! builder.append(", ");! }! builder.append(name);! }! return builder;! }! ! JAVA
79. Hasan Hosgel #dfist Optimizing StringBuilder public StringBuilder getDFIstNames(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
80. Hasan Hosgel #dfist 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
81. Hasan Hosgel #dfist Optimizing StringBuilder public StringBuilder addDFIstOrganizer(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
83. Hasan Hosgel #dfist Optimizing Moar – The Loop public StringBuilder addDFIstOrganizer(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. Hasan Hosgel #dfist Optimizing Moar – The Loop public StringBuilder addDFIstOrganizer(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
85. Hasan Hosgel #dfist Optimizing Moar – The Loop public StringBuilder addDFIstOrganizer(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
86. Hasan Hosgel #dfist Optimizing Moar – The Loop public StringBuilder addDFIstOrganizer(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
88. Hasan Hosgel #dfist 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
89. Hasan Hosgel #dfist 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
90. Hasan Hosgel #dfist 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
92. Source: https://www.flickr.com/photos/marcus_t_ward/10715983613
93. Source: http://www.bhmpics.com/success_kid-wallpapers.html
94. Source: http://www.flickr.com/photos/21496790@N06/5065834411/
95. Hasan Hosgel #dfist Contact: +HasanHosgel alosdev İlginiz için teşekkür ederim! We are hiring: http://www.kitchenstories.de/#jobs https://speakerdeck.com/alosdev/perfmatters-for-android- devfest-istanbul-2015
100. Hasan Hosgel #dfist Contact: +HasanHosgel alosdev İlginiz için teşekkür ederim! We are hiring: http://www.kitchenstories.de/#jobs https://speakerdeck.com/alosdev/perfmatters-for-android- devfest-istanbul-2015
101. Hasan Hosgel #dfist 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