PERFMATTERS for Android - DroidCon VIenna 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.

Transcript

1. #DroidconAT www.immobilienscout24.de Hasan Hosgel – Droidcon Vienna 2016 #PERFMATTERS for Android
2. #DroidconAT #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. #DroidconAT Why we are developers?
4. #DroidconAT 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. #DroidconAT User Expectations
18. #DroidconAT User Expectations Mobile App Users are impatient Source: https://ssl.www8.hp.com/ww/en/secure/pdf/4aa5-7696enw.pdf
19. #DroidconAT 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. #DroidconAT 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. #DroidconAT 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. #DroidconAT 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. #DroidconAT 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. #DroidconAT 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. #DroidconAT User Expectations Source: https://ssl.www8.hp.com/ww/en/secure/pdf/4aa5-7696enw.pdf
26. #DroidconAT 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. #DroidconAT 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. #DroidconAT 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. #DroidconAT Performance Impacts
30. #DroidconAT Performance Impacts 500 ms delay Source: http://www.mobilejoomla.com/media/press/responsive-vs-serverside/Responsive-Design-vs- Server-Side-Solutions-Infographic.jpg
31. #DroidconAT 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. #DroidconAT 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. #DroidconAT 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. #DroidconAT 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. #DroidconAT 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 their device Source: http://www.mobilejoomla.com/media/press/responsive-vs-serverside/Responsive-Design-vs- Server-Side-Solutions-Infographic.jpg
36. #DroidconAT 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 their 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@N08/1263954 439
38. Source: http://giphy.com/gifs/sad-kawaii-pretty-10XOyCb09KyjLy
39. #DroidconAT www.immobilienscout24.de Let‘s find some performance improvements
40. #DroidconAT Possible improvements CPU Memory I/O
41. #DroidconAT Possible improvements CPU Memory I/O
42. #DroidconAT Possible improvements CPU Memory I/O • Keep the work of the main thread à ANR
43. #DroidconAT Possible improvements CPU Memory I/O • Keep the work of the main thread à ANR • Avoid GPU overdrawings • https://www.youtube.com/watc h?v=T52v50r-JfE
44. #DroidconAT Possible improvements CPU Memory I/O • Keep the work of the main thread à ANR • Avoid GPU overdrawings • https://www.youtube.com/watc h?v=T52v50r-JfE • Avoid nested multi-pass layouts • http://goo.gl/Q5te24
45. #DroidconAT Possible improvements CPU Memory I/O • Keep the work of the main thread à ANR • Avoid GPU overdrawings • https://www.youtube.com/watc h?v=T52v50r-JfE • Avoid nested multi-pass layouts • http://goo.gl/Q5te24 • Consider RenderScript for performance critical code
46. #DroidconAT Possible improvements CPU Memory I/O
47. #DroidconAT Possible improvements CPU Memory I/O • Do not allocate memory inside onDraw()
48. #DroidconAT Possible improvements CPU Memory I/O • Do not allocate memory inside onDraw() • Avoid Leaks
49. #DroidconAT LeakCanary to the Rescue https://github.com/square/leakcan ary
50. #DroidconAT 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 DcAtApplication extends Application { @Override public void onCreate() { super.onCreate(); LeakCanary.install(this); } } DcAtApplication.java
51. #DroidconAT Use Your Debug Build Normally
52. #DroidconAT Analyze Memory
53. #DroidconAT Analyze Heap Dump
54. #DroidconAT Analyze Heap Dump
55. #DroidconAT Analyze Heap Dump since AS 1.5
56. #DroidconAT Analyze Memory
57. #DroidconAT Possible improvements CPU Memory I/O • Do not allocate memory inside onDraw() • Avoid Leaks • Avoid listener à EventBus
58. #DroidconAT 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
59. #DroidconAT 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
60. #DroidconAT Possible improvements CPU Memory I/O
61. #DroidconAT Possible improvements CPU Memory I/O • Activate gzip compression on incoming and outgoing network traffic or FlatBuffer
62. #DroidconAT Analyze First Start
63. #DroidconAT Analyze Second Start
64. #DroidconAT Analyze Second Start
65. #DroidconAT 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. #DroidconAT Finally Second Start
67. #DroidconAT 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. #DroidconAT 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. #DroidconAT Optimizing ArrayList
71. #DroidconAT Optimizing ArrayList public List<String> getDcAtNames(List<Attendee> attendees) { List<String> names = new ArrayList<>(); for (Attendee attendee : attendees) { names.add(attendee.name); } return names; } JAVA
72. #DroidconAT Optimizing ArrayList public List<String> getDcAtNames(List<Attendee> attendees) { List<String> names = new ArrayList<>(attendees.size()); for (Attendee attendee : attendees) { names.add(attendee.name); } return names; } JAVA
73. #DroidconAT 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. #DroidconAT Optimizing ArrayList void addDcAtSpeaker(ArrayList<String> attendees, List<String> speakers) { for (String speaker : speakers) { attendees.add(speaker); } } JAVA
75. #DroidconAT Optimizing ArrayList void addDcAtSpeaker(ArrayList<String> attendees, List<String> speakers) { attendees.ensureCapacity(attendees.size() + speakers.size()); for (String speaker : speakers) { attendees.add(speaker); } } JAVA
76. #DroidconAT Optimizing Bundle
77. #DroidconAT Optimizing Bundle public static DcAtScheduleFragment instance(int startMode) { final DcAtScheduleFragment fragment = new DcAtScheduleFragment(); final Bundle bundle = new Bundle(); bundle.putInt(START_MODE, startMode); fragment.setArguments(bundle); return fragment; } JAVA
78. #DroidconAT Optimizing Bundle public static DcAtScheduleFragment instance(int startMode) { final DcAtScheduleFragment fragment = new DcAtScheduleFragment(); final Bundle bundle = new Bundle(1); bundle.putInt(START_MODE, startMode); fragment.setArguments(bundle); return fragment; } JAVA
79. #DroidconAT Optimizing StringBuilder
80. #DroidconAT Optimizing StringBuilder public StringBuilder getDcAtNames(List<String> names) { StringBuilder builder = new StringBuilder(); for (String name : names) { if (builder.length() > 0) { builder.append(", "); } builder.append(name); } return builder; } JAVA
81. #DroidconAT Optimizing StringBuilder public StringBuilder getDcAtNames(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. #DroidconAT 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. #DroidconAT Optimizing StringBuilder public StringBuilder addDcAtOrganizer(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. #DroidconAT Optimizing Loops
85. #DroidconAT Optimizing Moar – The Loop public StringBuilder addDcAtOrganizer(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. #DroidconAT Optimizing Moar – The Loop public StringBuilder addDcAtOrganizer(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. #DroidconAT Optimizing Moar – The Loop public StringBuilder addDcAtOrganizer(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. #DroidconAT Optimizing Moar – The Loop public StringBuilder addDcAtOrganizer(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. #DroidconAT Optimizing Moar – The Loop public StringBuilder addDcAtOrganizer(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); names.append(organizer); names.append(", "); } names.substring(0, names.length()-1); } JAVA
90. #DroidconAT Optimizing Method invocations
91. #DroidconAT 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
92. #DroidconAT 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
93. #DroidconAT 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
94. #DroidconAT Optimizing Access Methods
95. #DroidconAT 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
96. #DroidconAT Finding Access Methods https://github.com/JakeWharton/dex-method-list $ ./build/dex-method-list src/test/resources/one.apk … package.DcAtScheduleFragment access$000(DcAtScheduleFragment ) package.DcAtScheduleFragment access$100(DcAtScheduleFragment , String) … CL
97. #DroidconAT 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
98. Source: https://www.flickr.com/photos/marcus_t_ward/10715983613
99. Source: http://www.bhmpics.com/success_kid-wallpapers.html
100. Source: http://www.flickr.com/photos/21496790@N06/5065834411/
101. #DroidconAT 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-berlin-2016
102. #DroidconAT
103. #DroidconAT
104. #DroidconAT
105. #DroidconAT
106. #DroidconAT 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-berlin-2016
107. #DroidconAT 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=PLWz5rJ2EKKc9CBxr3BVjPT PoDPLdPIFCE