Modern Android - How to ditch Activities & Fragments

Activities get destroyed when you rotate the screen and have a complex lifecycle. Using Fragments is error-prone and their lifecycle is even worse.

How would you like a screen that doesn't get destroyed on rotation, and a navigation as simple as calling goTo(screen)? That's what modern Android development should look like.

Transcript

14. Activity View for Screen B View for Screen A
15. Activity View for Screen B
22. Model Presenter View
23. Model Presenter View
24. Model Presenter View
25. Data Screen (Logic) View
34. goTo(screen)
37. MainActivity View for Screen A Navigator Screen A
38. New MainActivity New View for Screen A Navigator Screen A
40. MainActivity View for Screen A Navigator Screen A
41. MainActivity View for Screen A Navigator Screen A Screen B
42. MainActivity View for Screen A Navigator Screen A Screen B View for Screen B
43. MainActivity Navigator Screen A Screen B View for Screen B
44. MainActivity View for Screen A Navigator Screen A
46. navigator.goTo(new MySimpleScreen(stuff));
47. navigator.goTo(new MySimpleScreen(stuff));
48. navigator.overrideTransition(transition);
50. Navigator .withRoot(new HomeScreen()) .loggingEnabled(BuildConfig.DEBUG) .build();
51. navigator.goBack(); navigator.goBackTo(screen);
52. navigator.replace(screen);
53. navigator.rewriteHistory(new HistoryRewriter() { @Override public void rewriteHistory(Deque<Screen> history) { if (!authenticator.isUserLoggedIn()) { history.clear(); history.push(loginScreen); } else { history.push(homeScreen); } } } );
54. navigator.rewriteHistory(new HistoryRewriter() { @Override public void rewriteHistory(Deque<Screen> history) { if (!authenticator.isUserLoggedIn()) { history.clear(); history.push(loginScreen); } else { history.push(homeScreen); } } } );
56. public class MySimpleScreen extends Screen<MySimpleView> { @Override protected MySimpleView createView(Context context) { return new MySimpleView(context); } @Override public String getTitle(Context context) { return context.getString(R.string.my_screen_title); } @Override protected void onViewCreated() { getView().displayStuff(stuff); } }
57. public class MySimpleScreen extends Screen<MySimpleView> { @Override protected MySimpleView createView(Context context) { return new MySimpleView(context); } @Override public String getTitle(Context context) { return context.getString(R.string.my_screen_title); } @Override protected void onViewCreated() { getView().displayStuff(stuff); } }
58. public class MySimpleScreen extends Screen<MySimpleView> { @Override protected MySimpleView createView(Context context) { return new MySimpleView(context); } @Override public String getTitle(Context context) { return context.getString(R.string.my_screen_title); } @Override protected void onViewCreated() { getView().displayStuff(stuff); } }
59. public class MySimpleScreen extends Screen<MySimpleView> { @Override protected MySimpleView createView(Context context) { return new MySimpleView(context); } @Override public String getTitle(Context context) { return context.getString(R.string.my_screen_title); } @Override protected void onViewCreated() { getView().displayStuff(stuff); } }
60. public class MySimpleScreen extends Screen<MySimpleView> { @Override protected MySimpleView createView(Context context) { return new MySimpleView(context); } @Override public String getTitle(Context context) { return context.getString(R.string.my_screen_title); } @Override protected void onViewCreated() { getView().displayStuff(stuff); } }
61. public class MySimpleScreen extends Screen<MySimpleView> { @Override protected void onResume(Context context) { } @Override public String onPause(Context context) { } ... }
63. • ◦ onRetainNonConfigurationInstance() • Dequeue • • ◦ ◦
64. • ◦ • ◦ • ViewTreeObserver ◦ ◦ • onDestroy() ◦