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What The Context ?
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Adnan A M
April 11, 2020
Programming
2
210
What The Context ?
Slides from my talk at BLRDroid
Adnan A M
April 11, 2020
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Transcript
W at he on ex B d 1
Context ?!?? C nt xt s ur m gi !
— Adnan A M B d 2
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
Types of Context ✴ A t C ✴ A y
C ✴ B C ✴ T C ✴ t ✴ t B d 4
A tu l yp s f on ex ✴ U
C ✴ N -U C B d 5
Understanding the Hierarchy Context | Context Wrapper +-----------+---------+ | |
| Application Service ContextThemeWrapper | Activity B d 6
Understanding the Hierarchy ✴ C /C W ---> o C
✴ C T a -> C = C + T B d 7
UI Context Context + Your Theme B d 8
UI Context ✴ A y - i (I e a
y) ✴ F t - g e () ✴ V - g e () B d 9
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
Does it Matter ? My functionality works fine with either
\0/ B d 11
Which Context to Use ? B d 12
Application Context ✴ S o I e w h m
p ✴ g i C () ✴ N C (L L ) B d 13
Activity/Service Context ✴ U I e e a y/s ✴
t ✴ A y C - C ✴ S C - o C B d 14
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
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
getContext() It Depends \0/ B d 17
What #1 !!! ??? val intent = Intent(this, TestActivity::class.java) applicationContext.startActivity(intent)
B d 18
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
What #3 !!! ??? LayoutInflater.from(applicationContext).inflate( R.layout.progress_bar, parent, false ) B
d 20
Oh Wow #1 !!! val contextThemeWrapper = ContextThemeWrapper(this, R.style.YOUR_THEME) val
builder = AlertDialog.Builder(contextThemeWrapper) builder.show() B d 21
Sidenote val contextThemeWrapper = ContextThemeWrapper(this, R.style.YOUR_THEME) getBaseContext() ---> Returns instance
of this B d 22
Oh Wow #2 !!! val configuration = resources.configuration configuration.setLocale(your_custom_locale) context
= createConfigurationContext(configuration) B d 23
Oh Wow #3 !!! LayoutInflater.from(applicationContext).inflate( R.layout.progress_bar, parent, false ) B
d 24
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
References ✴ W C S I s - l M
a ✴ M n A C - G K ✴ C , a C - v S B d 26
T an Y u ! B d 27