Evolución Android (v3.0, DevFest Tarragona 2014)

Transcript

1. Evolución Android Del framework a la supervivencia del más fuerte
2. 1. El Origen de las Especies 2. Camino a la Extinción 3. Evolución Agenda
3. 1. El Origen de la Especies
4. Rubén Serrano Núñez (@Akelael) Lead Android Developer @RedboothHQ
6. Redbooth Beta Redbooth
7. WTF!
8. Creacionista
10. Evolucionista
12. ¿Creacionistas vs Evolucionistas?
13. “It’s the maintenance!”
14. 2. Camino a la extinción
15. 2.1. No cuestiones nada
16. Swiss Army Knife Application
17. public class Application extends android.app.Application {
 private static Gson gson; private Map<Long, Integer> mRoles; private Session mSession; private File mCacheDir; private NotificationManager mNotificationManager; private int mNumberNotifications; ! public static Session getSession() {
 return instance.mSession;
 }
 public static String getGCMToken() {
 AccountManager am = AccountManager.get(Application.getContext());
 return am.getUserData(Application.getSession().getUser(), AccountAuthenticator.GCM_TOKEN);
 }
 
 public static File getCacheDirectory() {
 return instance.mCacheDir;
 }
18. How do I pass data between Activities/Services within a single application?
19. The android.app.Application class The android.app.Application is a base class for those who need to maintain global application state. It can be accessed via getApplication() from any Activity or Service. It has a couple of life-cycle methods and will be instantiated by Android automatically if your register it in AndroidManifest.xml. http://goo.gl/skj7dA
20. A Singleton class There are advantages to using a static Singleton […] But, the life cycle of a static is not well under your control; so to abide by the life-cycle model, the application class should initiate and tear down these static objects in the onCreate() and onTerminate() methods of the Application Class http://goo.gl/skj7dA
21. Lo puse todo en Application y … ¡Quita eso de ahí, guarro!
22. <pause>
23. Ahora si, ahora no: Relative Layout
24. Ahora si, ahora no: Enums vs Static Final Fields
25. Ahora si, ahora no: ViewHolder
26. private static class ViewHolder {
 public TextView textView;
 public ImageView imageView;
 } ! @Override
 public View getView(int position, View convertView, ViewGroup parent) {
 View view = convertView;
 ViewHolder viewHolder;
 if (view == null) {
 view = inflater.inflate(R.layout.item, parent, false);
 viewHolder = new ViewHolder();
 viewHolder.textView = (TextView) view.findViewById(R.id.text);
 viewHolder.imageView = (ImageView) view.findViewById(R.id.image);
 view.setTag(viewHolder);
 }
 viewHolder = (ViewHolder) view.getTag();
 viewHolder.textView.setText("Random string");
 viewHolder.imageView.setBackgroundColor(R.color.black);
 return view;
 } ViewHolder
27. @Override
 public View getView(int position, View convertView, ViewGroup parent) {
 View view = convertView;
 if (view == null) {
 view = inflater.inflate(R.layout.item, parent, false);
 }
 ((TextView) view.findViewById(R.id.text)).setText(“Random string");
 ((ImageView) view.findViewById(R.id.image)).setBackgroundColor(R.color.black);
 return view;
 } No Holder
28. Ahora… ActionBarCompat Nested Fragments Navigation drawer Native Pull-to-Refresh
29. Si lo recomienda
30. Por supuesto que no
31. ”Bastante ha hecho Google con darnos un SDK” - Jorge Barroso
32. </Pause>
33. 2.2. Usa la solución más cómoda
34. Juguemos… • Descargar datos de un servidor • Parser JSON • Guardar datos en la BBDD • Recuperar datos de la BBDD • Mostrar datos en la pantalla
35. • Descargar datos de un servidor • Parser JSON • Guardar datos en la BBDD • Recuperar datos de la BBDD • Mostrar datos en la pantalla Juguemos…
36. God Activity
37. startManagingCursor(Cursor c)
38. God Fragment
39. “Una Activity para gobernarlos a todos; una Activity para encontrarlos; una Activity para atraerlos a todos y atarlos a las tinieblas” - El Señor de los Fragments
40. SauronActivity
41. Keep it simple, stupid!
42. <pause>
43. Clean code vs Lengua Oscura de Mordor
44. </pause>
45. AsyncTask
46. AsyncTask + startManagingCursor
47. Loaders!
48. LoaderCallbacks<Cursor> callback = new LoaderCallbacks<Cursor>() {
 @Override
 public Loader<Cursor> onCreateLoader(int id, Bundle args) {
 return new CursorLoader(context, uri, null, null, null, null);
 }
 
 @Override
 public void onLoadFinished(Loader<Cursor> loader, Cursor data) { adapter.swapCursor(data);
 }
 
 @Override
 public void onLoaderReset(Loader<Cursor> loader) {
 
 }
 }; LoaderCallbacks
49. 2.3. Usa siempre el framework
50. ContentProvider
51. Really?
52. SyncAdapter
53. ¿Cuándo?
54. 3. Evolución
56. SOLID
57. Model View Presenter
58. Unit testing
59. Test Driven Development
60. Ports & Adapters (Hexagonal Architecture)
61. Conclusiones
62. It is not the strongest of the species that survives, nor the most intelligent, but rather the one most adaptable to change. Charles Darwin
63. It is not the strongest of the species that survives, nor the most intelligent, but rather the one most adaptable to change. Charles Darwin
64. Código mantenible
65. Y legible
66. Aprendizaje continuo
67. Espíritu crítico
68. Remember!
69. ¡Muchas gracias!
70. Q & A Rubén Serrano Núñez @Akelael plus.google.com/+RubénSerrano