Android Design Patterns

Apresentação realizada na meetup do GDG Porto Alegre em 20/02/2014.

Transcript

1. Android Design Patterns
2. Android Design Patterns @felipecsl
4. 5MM+ downloads 85k reviews 4.5 ★ average rating
5. Android app 2.5 developers
6. Brigita Fernežir on Feb 9, 2014 at 4:56 PM It fucking crashes all the time fix it !!! Usuários são cruéis
7. 1. Best practices
8. 2. Open Source 1. Best practices
9. 2. Open Source 3. Code design patterns 1. Best practices
10. 1. Best practices
11. UNIT TESTS 1. Best practices
12. UNIT TESTS • jUnit 1. Best practices
13. UNIT TESTS • jUnit • Robolectric 1. Best practices
14. UNIT TESTS • jUnit • Robolectric • Mockito 1. Best practices
15. INTEGRAÇÃO CONTÍNUA 1. Best practices
16. INTEGRAÇÃO CONTÍNUA • Jenkins 1. Best practices
17. INTEGRAÇÃO CONTÍNUA • Jenkins • TestFlight 1. Best practices
18. INTEGRAÇÃO CONTÍNUA • Jenkins • TestFlight 1. Best practices • Travis
19. TESTES FUNCIONAIS 1. Best practices
20. TESTES FUNCIONAIS • Calabash 1. Best practices
21. TESTES FUNCIONAIS • Calabash • Robotium 1. Best practices
22. 1. Best practices DRY - DON’T REPEAT YOURSELF
23. • Android Bootstrap 1. Best practices http://www.androidbootstrap.com/ DRY - DON’T REPEAT YOURSELF
24. DRY - DON’T REPEAT YOURSELF • Android Action Bar Style Generator 1. Best practices http://jgilfelt.github.io/android-actionbarstylegenerator
25. 1. Best practices USE STANDARD LIBRARIES
26. USE STANDARD LIBRARIES • Support v4 1. Best practices
27. USE STANDARD LIBRARIES • Support v4 • AppCompat 1. Best practices
28. ANDROID STUDIO 1. Best practices
29. ANDROID STUDIO • Gradle 1. Best practices
30. EMULATOR 1. Best practices
31. EMULATOR • Genymotion 1. Best practices
32. 2. Open Source
33. 2. Open Source Por que?
34. 2. Open Source Por que? • Maior qualidade
35. 2. Open Source Por que? • Maior qualidade • Liberdade para fazer alterações
36. 2. Open Source Por que? • Maior qualidade • Liberdade para fazer alterações • Aprendizado
37. 2. Open Source Por que? • Maior qualidade • Liberdade para fazer alterações • Aprendizado • Visibilidade
38. 2. Open Source Jake Wharton Square
39. 2. Open Source UI e Compatibilidade
40. 2. Open Source UI e Compatibilidade Android Support Library v4 • DrawerLayout, ActionBarDrawerToggle • Fragment • ViewPager • NotificationCompat http://developer.android.com/tools/support-library/features.html#v4
41. 2. Open Source UI e Compatibilidade Android AppCompat v7 • ActionBar • ActionBarActivity • ShareActionProvider • GridLayout http://developer.android.com/tools/support-library/features.html#v7-appcompat
42. 2. Open Source UI e Compatibilidade ViewPagerIndicator http://viewpagerindicator.com/
43. 2. Open Source UI e Compatibilidade NineOldAndroids Backport da API de animações https://github.com/JakeWharton/NineOldAndroids/ AnimatorSet set = new AnimatorSet(); set.playTogether( ObjectAnimator.ofFloat(myView, "rotationX", 0, 360), ObjectAnimator.ofFloat(myView, "rotationY", 0, 180), ObjectAnimator.ofFloat(myView, "rotation", 0, -90), ObjectAnimator.ofFloat(myView, "translationX", 0, 90), ObjectAnimator.ofFloat(myView, "translationY", 0, 90), ObjectAnimator.ofFloat(myView, "scaleX", 1, 1.5f), ObjectAnimator.ofFloat(myView, "scaleY", 1, 0.5f), ObjectAnimator.ofFloat(myView, "alpha", 1, 0.25f, 1) ); set.setDuration(5 * 1000).start();
44. 2. Open Source UI e Compatibilidade ActionBar-PullToRefresh https://github.com/chrisbanes/actionbar-pulltorefresh
45. 2. Open Source Caching e Networking
46. 2. Open Source Caching e Networking DiskLruCache Disk-based LRU cache https://github.com/jakewharton/disklrucache
47. 2. Open Source Caching e Networking Picasso Image downloading and caching http://square.github.io/picasso/
48. 2. Open Source Caching e Networking Android-Async-Http Asynchronous HTTP https://github.com/loopj/android-async-http import org.json.*; import com.loopj.android.http.*; ! class TwitterRestClientUsage { public void getPublicTimeline() throws JSONException { TwitterRestClient.get("statuses/public_timeline.json", null, new JsonHttpResponseHandler() { @Override public void onSuccess(JSONArray timeline) { // Pull out the first event on the public timeline JSONObject firstEvent = timeline.get(0); String tweetText = firstEvent.getString("text"); ! // Do something with the response System.out.println(tweetText); } }); } }
49. 2. Open Source Caching e Networking Http-Request https://github.com/kevinsawicki/http-request String response = HttpRequest.get("http://google.com").body(); System.out.println("Response was: " + response);
50. 2. Open Source Comunicação e Concorrência
51. 2. Open Source Comunicação e Concorrência Otto Event Bus http://square.github.io/otto/ Bus bus = new Bus(); bus.post(new AnswerAvailableEvent(42)); ! //... ! @Subscribe public void answerAvailable(AnswerAvailableEvent event) { // TODO: React to the event somehow! }
52. 2. Open Source Dependency Injection
53. 2. Open Source Dependency Injection Dagger http://square.github.io/dagger/ class CoffeeMaker { @Inject Heater heater; @Inject Pump pump; ! ... } ! class Thermosiphon implements Pump { private final Heater heater; ! @Inject Thermosiphon(Heater heater) { this.heater = heater; } ! ... }
54. 2. Open Source Dependency Injection Butter Knife https://github.com/JakeWharton/butterknife View Injection class ExampleActivity extends Activity { @InjectView(R.id.user) EditText username; @InjectView(R.id.pass) EditText password; ! @OnClick(R.id.submit) void submit() { // TODO call server... } ! @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.simple_activity); ButterKnife.inject(this); // TODO Use "injected" views... } }
55. 3. Code design patterns Activity
56. 3. Code design patterns • Auto-contida Activity
57. 3. Code design patterns • Libera recursos ao ser finalizada • Auto-contida Activity
58. 3. Code design patterns • Auto-contida • Libera recursos ao ser finalizada • Não é dependência de objetos globais Activity • Delega responsabilidades
59. 3. Code design patterns Activity Auto-contida Inputs e outputs definidos via Intent/Bundle Implementa onSaveInstanceState Não possui lógica de negócio
60. 3. Code design patterns Activity Libera recursos ao ser finalizada @Override public void onDestroy() { super.onDestroy(); BusProvider.getInstance().unregister(this); }
61. 3. Code design patterns Activity Não é dependência de objetos globais @Override public void onCreate(Bundle savedState) { super.onCreate(savedState); LongLivedObject obj = LongLivedObject.getInstance(); obj.doSomething(this); // bad } Exemplo do que não fazer:
62. 3. Code design patterns Fragment
63. 3. Code design patterns Fragment Reutilize fragments para evitar repetição
64. 3. Code design patterns Fragment Reutilize fragments para evitar repetição Crie custom Views para layouts complexos
65. 3. Code design patterns Performance
66. 3. Code design patterns Performance Utilize a UI Thread apenas para layout!
67. 3. Code design patterns Performance Utilize a UI Thread apenas para layout! Mova tarefas paralelas para o background
68. 3. Code design patterns Performance Utilize a UI Thread apenas para layout! Mova tarefas paralelas para o background Pense um pouco antes de instanciar objetos
69. 3. Code design patterns Performance Utilize a UI Thread apenas para layout! Mova tarefas paralelas para o background Pense um pouco antes de instanciar objetos Cancele AsyncTasks ao finalizar a Activity
70. 3. Code design patterns A.B.C Always be coding! :-)
71. Obrigado! @felipecsl http://felipecsl.com