What The Context ?

Slides from my talk at BLRDroid

Transcript

1. W at he on ex B d 1
2. Context ?!?? C nt xt s ur m gi ! — Adnan A M B d 2
3. W y o n ed on ex ? ✴ g u () ✴ g t () ✴ g e c () ✴ g () ✴ s X() -> S n c n (A y, S , B s e ) B d 3
4. Types of Context ✴ A t C ✴ A y C ✴ B C ✴ T C ✴ t ✴ t B d 4
5. A tu l yp s f on ex ✴ U C ✴ N -U C B d 5
6. Understanding the Hierarchy Context | Context Wrapper +-----------+---------+ | | | Application Service ContextThemeWrapper | Activity B d 6
7. Understanding the Hierarchy ✴ C /C W ---> o C ✴ C T a -> C = C + T B d 7
8. UI Context Context + Your Theme B d 8
9. UI Context ✴ A y - i (I e a y) ✴ F t - g e () ✴ V - g e () B d 9
10. Non UI Context ✴ A y - g i C () ✴ S - g i C () / i (I e s ) ✴ C - g i C () ✴ B s R r - C p B d 10
11. Does it Matter ? My functionality works fine with either \0/ B d 11
12. Which Context to Use ? B d 12
13. Application Context ✴ S o I e w h m p ✴ g i C () ✴ N C (L L ) B d 13
14. Activity/Service Context ✴ U I e e a y/s ✴ t ✴ A y C - C ✴ S C - o C B d 14
15. Broadcast Receiver Context ✴ U I e e c ✴ c p a t ✴ N C ✴ Y e a R r c t w a r r e () n b v () d d B d 15
16. Base Context ✴ T d e i n h C ✴ C e l c ✴ C o d u a a e () h C W B d 16
17. getContext() It Depends \0/ B d 17
18. What #1 !!! ??? val intent = Intent(this, TestActivity::class.java) applicationContext.startActivity(intent) B d 18
19. What #2 !!! ??? class SimpleSingleton { private static SimpleSingleton sInstance; private Context mContext; public static SimpleSingleton getInstance(Context context) { if (sInstance == null) { sInstance = new SimpleSingleton(context); } return sInstance; } private SimpleSingleton(Context context) { mContext = context; } } B d 19
20. What #3 !!! ??? LayoutInflater.from(applicationContext).inflate( R.layout.progress_bar, parent, false ) B d 20
21. Oh Wow #1 !!! val contextThemeWrapper = ContextThemeWrapper(this, R.style.YOUR_THEME) val builder = AlertDialog.Builder(contextThemeWrapper) builder.show() B d 21
22. Sidenote val contextThemeWrapper = ContextThemeWrapper(this, R.style.YOUR_THEME) getBaseContext() ---> Returns instance of this B d 22
23. Oh Wow #2 !!! val configuration = resources.configuration configuration.setLocale(your_custom_locale) context = createConfigurationContext(configuration) B d 23
24. Oh Wow #3 !!! LayoutInflater.from(applicationContext).inflate( R.layout.progress_bar, parent, false ) B d 24
25. Deciding Between UI & Non UI Context ✴ D o e a r s ? --> C ✴ L L o O o --> o C ✴ N r ? --> B t o C B d 25
26. References ✴ W C S I s - l M a ✴ M n A C - G K ✴ C , a C - v S B d 26
27. T an Y u ! B d 27