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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.

Hasan Hosgel

April 07, 2016
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  1. #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)
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. 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
  20. Possible improvements CPU Memory I/O •  Do not allocate memory

    inside onDraw() •  Avoid Leaks •  Avoid listener ! EventBus
  21. 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
  22. 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
  23. Possible improvements CPU Memory I/O •  Activate gzip compression on

    incoming and outgoing network traffic or FlatBuffer
  24. 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
  25. 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
  26. 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
  27. 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
  28. 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
  29. 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
  30. 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
  31. 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
  32. 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
  33. 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
  34. 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
  35. 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
  36. 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
  37. 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
  38. 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
  39. 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
  40. 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
  41. 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
  42. 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
  43. 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
  44. 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
  45. 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
  46. 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
  47. 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