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MV V M & N E S T E D F R AG M E N T/ V I E W S - V I E W M O D E L CO N T R AC TS M A R C O S DA M A S C E N O S R . A N D R O I D E NG I N E E R @marcospaulosd B R E T E R I C K S O N A N D R O I D E NG I N E E R I NG M A N AG E R linkedin.com/in/breterickson/

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A N D R O I D H O N E YCO M B R E L E A S E D O N F E B , 2 01 1

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A N D R O I D H O N E YCO M B R E L E A S E D O N F E B , 2 01 1 C O M P L E X A N D DY N A M I C V I E W S B EC A M E MO R E PO P U L A R

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A N D R O I D H O N E YCO M B R E L E A S E D O N F E B , 2 01 1 C O M P L E X A N D DY N A M I C V I E W S B EC A M E MO R E PO P U L A R H E L LO F R AG M E N TS

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A N D R O I D U I CO M P L E X I T Y TA B L E TS A R E N OW H E R E TO B E S E E N B U T P H O N E S A R E B I G

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A N D R O I D U I CO M P L E X I T Y TA B L E TS A R E N OW H E R E TO B E S E E N B U T P H O N E S A R E B I G A P P S A R E B EC O M I NG C O N S TA N T LY C O M P L E X

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A N D R O I D U I CO M P L E X I T Y TA B L E TS A R E N OW H E R E TO B E S E E N B U T P H O N E S A R E B I G A P P S A R E B EC O M I NG C O N S TA N T LY C O M P L E X

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H O W D O W E CO M M U N IC AT E B E T W E E N S O M A N Y D I F F E R E N T V I E W S A N D F R AG M E N T S

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CO M M U N I C AT I O N B E T W E E N F R AG M E N T S I N T E N T B R OA D C A S T/ B U N D L E S

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CO M M U N I C AT I O N B E T W E E N F R AG M E N T S C A L L B AC K S & I N T E R FAC E S O NC L IC K L I ST E N E R I M P L BY AC T IV I T Y - C A L L BAC K H E L L C A ST AC T IV I T Y I N TO A N I N T E R FAC E I N S I D E T H E F R AG M E N T - W H AT I F I WA N T TO R E U S E I T 
 I N S I D E A NOT H E R F R AG M E N T V I E W CO N T R O L L E R S J U G G L E CO M M U N I C AT IO N LOG IC

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CO M M U N I C AT I O N B E T W E E N F R AG M E N T S R X S U B J EC TS I N J EC T I N G A N R X S U B J EC T I N TO A F R AG M E N T ’ S V M / P R E S E N T E R M AY E X PO S E M U TA B L E VA L U E S E V E RY W H E R E R X S U B J EC T S A R E N OT FAU LT TO L E R A N T - AT T H E E N D, A FA NC Y A LT E R N AT IV E TO E V E N T B U S - O N E E R R O R E M I T T E D 
 A N D YO U ’ R E D O N E D I F F IC U LT TO D E B U G & U N D E R S TA N D F LOW A S CO M P L E X I T Y I NC R E A S E S

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P O P U L A R A R C H I T EC T U R E S

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P O P U L A R A R C H I T EC T U R E S D O M A I N - DATA

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P O P U L A R A R C H I T EC T U R E S D O M A I N - DATA DATA L AY E R R E P O S I TO RY DATA S TO R E A P I C L I E N T

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P O P U L A R A R C H I T EC T U R E S D O M A I N - DATA DATA L AY E R R E P O S I TO RY DATA S TO R E A P I C L I E N T D O M A I N I N T E R FAC E S U S E C A S E S

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P O P U L A R A R C H I T EC T U R E S D O M A I N - DATA DATA L AY E R R E P O S I TO RY DATA S TO R E A P I C L I E N T D O M A I N I N T E R FAC E S U S E C A S E S U I V I E W M O D E L S F R AG M E N TS C U STO M V I E W S

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P O P U L A R A R C H I T EC T U R E S U I V I E W M O D E L S F R AG M E N TS C U STO M V I E W S

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U I V I E W M O D E L S F R AG M E N TS C U STO M V I E W S

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U I

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U I D O U BT S S H O U L D I H AV E O N E V I E W MO D E L FO R M U LT I P L E F R AG M E N T S ?

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U I D O U BT S S H O U L D I H AV E O N E V I E W MO D E L FO R M U LT I P L E F R AG M E N T S ? I S I T O K TO H AV E V I E W MO D E L S FO R C U STO M V I E W S ?

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U I D O U BT S S H O U L D I H AV E O N E V I E W MO D E L FO R M U LT I P L E F R AG M E N T S ? I S I T O K TO H AV E V I E W MO D E L S FO R C U STO M V I E W S ? S H O U L D W E S H A R E V I E W MO D E L S AC R O S S M U LT I P L E U I E L E M E N T S ?

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I N T R O D U C I N G

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V I E W M O D E L CO N T R AC T S I N T R O D U C I N G

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B U T B E F O R E

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B U T B E F O R E L E T ’ S A N A LYZ E A S I M P L E P R O B L E M

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A R EG I ST R AT IO N F LO W

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R EG I ST R AT IO N F LOW : F E AT U R E R EQ U I R E M E N TS

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R EG I ST R AT IO N F LOW : F E AT U R E R EQ U I R E M E N TS U S E R N A M E

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R EG I ST R AT IO N F LOW : F E AT U R E R EQ U I R E M E N TS E M A I L U S E R N A M E

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R EG I ST R AT IO N F LOW : F E AT U R E R EQ U I R E M E N TS I N T E R E S TS E M A I L U S E R N A M E

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R EG I ST R AT IO N F LOW : F E AT U R E R EQ U I R E M E N TS I N T E R E S TS E M A I L U S E R N A M E

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B A S I C I M P L E M E N TAT I O N M U LT I - AC T IV I T Y ?

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B A S I C I M P L E M E N TAT I O N M U LT I - AC T IV I T Y ?

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B A S I C I M P L E M E N TAT I O N M U LT I - AC T IV I T Y ? C A L L B AC K I N T E R FAC E S

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RegistrationActivity

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RegistrationActivity RegistrationViewModel L I V E D ATA

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RegistrationActivity UsernameFragment RegistrationViewModel L I V E D ATA

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RegistrationActivity UsernameFragment UsernameCallback RegistrationViewModel L I V E D ATA

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F E AT U R E C R E E P ! ! ! ! !

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P E R S I S T E D R EG I S T R AT I O N P R O G R E S S U I F E AT U R E C R E E P ! ! ! ! !

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P E R S I S T E D R EG I S T R AT I O N P R O G R E S S U I F E AT U R E C R E E P ! ! ! ! !

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P E R S I S T E D R EG I S T R AT I O N P R O G R E S S U I F E AT U R E C R E E P ! ! ! ! !

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R E FAC TO R I NG C A L L B AC K I N T E R FAC E S

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R E FAC TO R I NG I N T E R FAC E C A L L B AC K S

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R E FAC TO R I NG S H A R E D V I E W MO D E L I N T E R FAC E C A L L B AC K S

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UsernameFragment RegistrationActivity RegistrationViewModel L I V E D ATA UsernameCallback

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UsernameFragment RegistrationActivity RegistrationViewModel L I V E D ATA

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UsernameFragment ProgressFragment EmailFragment InterestsFragment RegistrationActivity RegistrationViewModel L I V E D ATA

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L IV E DATA & V I E W M O D E L R E F R E S H E R

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L IV E DATA & V I E W MO D E L R E F R E S H E R

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L IV E DATA & V I E W MO D E L R E F R E S H E R L IV E DATA

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L IV E DATA W O R K S L I K E A B E H AV I O R S U B J EC T

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L IV E DATA W O R K S L I K E A B E H AV I O R S U B J EC T E V E RY T I M E W E S U B S C R I B E TO I T, I T E M I TS T H E L AT E ST VA L U E

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L IV E DATA W O R K S L I K E A B E H AV I O R S U B J EC T E V E RY T I M E W E S U B S C R I B E TO I T, I T E M I TS T H E L AT E ST VA L U E O B S E R VAT IO N C A N B E AT TAC H E D TO A L I F EC YC L E

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V I E W MO D E L

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V I E W MO D E L S H A R E V I E W MO D E L

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V I E W MO D E L S H A R E V I E W MO D E L

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V I E W MO D E L S H A R E V I E W MO D E L

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V I E W MO D E L S H A R E V I E W MO D E L

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V I E W MO D E L S H A R E V I E W MO D E L

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V I E W MO D E L S H A R E V I E W MO D E L

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V I E W MO D E L S H A R E V I E W MO D E L

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V I E W MO D E L S H A R E V I E W MO D E L

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V I E W MO D E L S H A R E V I E W MO D E L

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V I E W MO D E L S H A R E V I E W MO D E L

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V I E W MO D E L S H A R E V I E W MO D E L WAIT A MINUTE!!!!

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V I E W MO D E L S H A R E V I E W MO D E L

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V I E W MO D E L

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V I E W MO D E L V I E W M O D E L I N STA N C E S A R E S TO R E D I N A M A P W H E R E T H E C A NO N I C A L N A M E I S A K E Y A N D T H E C L A Z Z I S T H E VA LU E

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V I E W MO D E L V I E W M O D E L I N STA N C E S A R E S TO R E D I N A M A P W H E R E T H E C A NO N I C A L N A M E I S A K E Y A N D T H E C L A Z Z I S T H E VA LU E W H E N W E D O N ’ T F I N D A N I N S TA N C E FO R T H AT C L A S S C A N O N I C A L N A M E , W E T H E N M A K E A N E W I N STA NC E A N D A D D TO T H E M A P

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V I E W MO D E L I F W E H AV E T H E C L A Z Z O F T H E V I E W M O D E L T H AT W E WA N T

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V I E W MO D E L I F W E H AV E T H E C L A Z Z O F T H E V I E W M O D E L T H AT W E WA N T C A N W E PA S S T H AT I N F O R M AT IO N TO O U R F R AG M E N TS A N D H AV E I T LO O K F O R T H E V I E W M O D E L F O R T H AT C L A Z Z ?

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V I E W MO D E L I F W E H AV E T H E C L A Z Z O F T H E V I E W M O D E L T H AT W E WA N T C A N W E PA S S T H AT I N F O R M AT IO N TO O U R F R AG M E N TS A N D H AV E I T LO O K F O R T H E V I E W M O D E L F O R T H AT C L A Z Z ? C A N W E ACC E S S T H E PA R E N T V I E W MO D E L W I T HO U T K NOW I NG W H AT T H AT PA R E N T V I E W M O D E L I S ?

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V I E W MO D E L I F W E H AV E T H E C L A Z Z O F T H E V I E W M O D E L T H AT W E WA N T C A N W E PA S S T H AT I N F O R M AT IO N TO O U R F R AG M E N TS A N D H AV E I T LO O K F O R T H E V I E W M O D E L F O R T H AT C L A Z Z ? C A N W E ACC E S S T H E PA R E N T V I E W MO D E L W I T HO U T K NOW I NG W H AT T H AT PA R E N T V I E W M O D E L I S ?

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V I E W MO D E L I F W E H AV E T H E C L A Z Z O F T H E V I E W M O D E L T H AT W E WA N T C A N W E PA S S T H AT I N F O R M AT IO N TO O U R F R AG M E N TS A N D H AV E I T LO O K F O R T H E V I E W M O D E L F O R T H AT C L A Z Z ? C A N W E ACC E S S T H E PA R E N T V I E W MO D E L W I T HO U T K NOW I NG W H AT T H AT PA R E N T V I E W M O D E L I S ? Y E S W E C A N

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UsernameFragment ProgressFragment EmailFragment InterestsFragment RegistrationActivity RegistrationViewModel L I V E D ATA

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UsernameFragment ProgressFragment EmailFragment InterestsFragment RegistrationViewModel L I V E D ATA

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RegistrationViewModel L I V E D ATA UsernameFragment EmailFragment ProgressFragment InterestsFragment

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RegistrationViewModel L I V E D ATA UsernameFragment EmailFragment ProgressFragment InterestsFragment

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RegistrationViewModel L I V E D ATA UsernameFragment EmailFragment ProgressFragment InterestsFragment

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RegistrationViewModel L I V E D ATA UsernameFragment EmailFragment ProgressFragment InterestsFragment

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RegistrationViewModel L I V E D ATA UsernameFragment EmailFragment ProgressFragment InterestsFragment : UsernameFragmentViewModelContract

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RegistrationViewModel L I V E D ATA UsernameFragment EmailFragment ProgressFragment InterestsFragment : UsernameFragmentViewModelContract : EmailFragmentViewModelContract

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RegistrationViewModel L I V E D ATA UsernameFragment EmailFragment ProgressFragment InterestsFragment : UsernameFragmentViewModelContract : EmailFragmentViewModelContract : InterestsFragmentViewModelContract

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RegistrationViewModel L I V E D ATA UsernameFragment EmailFragment ProgressFragment InterestsFragment : UsernameFragmentViewModelContract : EmailFragmentViewModelContract : InterestsFragmentViewModelContract : ProgressFragmentViewModelContract

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RegistrationViewModel L I V E D ATA UsernameFragment EmailFragment ProgressFragment InterestsFragment : UsernameFragmentViewModelContract : EmailFragmentViewModelContract : InterestsFragmentViewModelContract : ProgressFragmentViewModelContract arguments.put(key, RegistrationViewModel::class.java) instantiate

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RegistrationViewModel L I V E D ATA UsernameFragment EmailFragment InterestsFragment : UsernameFragmentViewModelContract : EmailFragmentViewModelContract : InterestsFragmentViewModelContract : ProgressFragmentViewModelContract arguments.put(key, RegistrationViewModel::class.java) VMProvider.of(…).get(arguments[key]) as UsernameFragmentViewModelContract) instantiate

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RegistrationViewModel L I V E D ATA UsernameFragment EmailFragment InterestsFragment : UsernameFragmentViewModelContract : EmailFragmentViewModelContract : InterestsFragmentViewModelContract : ProgressFragmentViewModelContract ProgressFragment

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RegistrationViewModel L I V E D ATA UsernameFragment EmailFragment InterestsFragment : UsernameFragmentViewModelContract : EmailFragmentViewModelContract : InterestsFragmentViewModelContract : ProgressFragmentViewModelContract ProgressFragment

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RegistrationViewModel L I V E D ATA UsernameFragment EmailFragment InterestsFragment : UsernameFragmentViewModelContract : EmailFragmentViewModelContract : InterestsFragmentViewModelContract : ProgressFragmentViewModelContract ProgressFragment

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RegistrationViewModel L I V E D ATA UsernameFragment EmailFragment InterestsFragment : UsernameFragmentViewModelContract : EmailFragmentViewModelContract : InterestsFragmentViewModelContract : ProgressFragmentViewModelContract ProgressFragment

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RegistrationViewModel L I V E D ATA UsernameFragment EmailFragment InterestsFragment : UsernameFragmentViewModelContract : EmailFragmentViewModelContract : InterestsFragmentViewModelContract : ProgressFragmentViewModelContract ProgressFragment

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RegistrationViewModel L I V E D ATA UsernameFragment EmailFragment InterestsFragment : UsernameFragmentViewModelContract : EmailFragmentViewModelContract : InterestsFragmentViewModelContract : ProgressFragmentViewModelContract ProgressFragment

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RegistrationViewModel L I V E D ATA RegistrationActivity

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RegistrationMasterViewModel L I V E D ATA RegistrationMasterFragment

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RegistrationMasterViewModel L I V E D ATA RegistrationMasterFragment

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UsernameFragment EmailFragment InterestsFragment : UsernameFragmentViewModelContract : EmailFragmentViewModelContract : InterestsFragmentViewModelContract : ProgressFragmentViewModelContract ProgressFragment RegistrationMasterViewModel L I V E D ATA

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UsernameFragment EmailFragment InterestsFragment : UsernameFragmentViewModelContract : EmailFragmentViewModelContract : InterestsFragmentViewModelContract : ProgressFragmentViewModelContract ProgressFragment RegistrationMasterViewModel L I V E D ATA arguments.put(key, RegistrationMasterViewModel::class.java) instantiate

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A R EG I ST R AT I O N F LO W W I T H V I E W M O D E L CO N T R AC T S

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ProgressFragment RegistrationActivity RegistrationViewModel L I V E D ATA

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ProgressFragment RegistrationActivity RegistrationViewModel L I V E D ATA

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ProgressFragment RegistrationActivity RegistrationViewModel L I V E D ATA

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ProgressFragment L I V E D ATA RegistrationActivity RegistrationViewModel L I V E D ATA 1 ProgressViewModelContract

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ProgressFragment L I V E D ATA RegistrationActivity RegistrationViewModel L I V E D ATA 1 2 ProgressViewModelContract

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ProgressFragment L I V E D ATA RegistrationActivity RegistrationViewModel L I V E D ATA 1 2 3 ProgressViewModelContract

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ProgressFragment ProgressViewModelContract L I V E D ATA RegistrationActivity RegistrationViewModel L I V E D ATA 1 2 3 4

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P R OG R E S S V I E W MO D E L CO N T R AC T

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P R OG R E S S V I E W MO D E L CO N T R AC T

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P R OG R E S S V I E W MO D E L CO N T R AC T

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U S I NG T H E V I E W M O D E L CO N T R AC T

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U S I NG T H E V I E W M O D E L CO N T R AC T

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U S I NG T H E V I E W M O D E L CO N T R AC T

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U S I NG T H E V I E W M O D E L CO N T R AC T

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R E T R I E V I N G A V I E W MO D E L CO N T R AC T

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R E T R I E V I N G A V I E W MO D E L CO N T R AC T

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R E T R I E V I N G A V I E W MO D E L CO N T R AC T

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R E T R I E V I N G A V I E W MO D E L CO N T R AC T

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E N FO R C I NG V I E W MO D E L CO N T R AC T U SAG E

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E N FO R C I NG V I E W MO D E L CO N T R AC T U SAG E

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R EG I ST E R I NG T H E V I E W MO D E L K E Y

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C R E AT I N G T H E F R AG M E N T

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C R E AT I N G T H E F R AG M E N T

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C R E AT I N G T H E F R AG M E N T

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I M P L E M E N T I N G T H E CO N T R AC T

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I M P L E M E N T I N G T H E CO N T R AC T

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I M P L E M E N T I N G T H E CO N T R AC T

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V I E W MO D E L CO N T R AC TS , A DVA NC E D PA R E N T F R AG M E N T S & AC T IV I T I E S M ATC H BY L A Z Y S T Y L E

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V I E W MO D E L CO N T R AC TS , A DVA NC E D

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V I E W MO D E L CO N T R AC TS , A DVA NC E D

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TA K E AWAYS

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TA K E AWAYS Decouples Fragments

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TA K E AWAYS Decouples Fragments Reduces Scope

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TA K E AWAYS Decouples Fragments Reduces Scope Improves reusability

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TA K E AWAYS

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MV V M & N E S T E D F R AG M E N T/ V I E W S - V I E W M O D E L CO N T R AC TS M A R C O S DA M A S C E N O S R . A N D R O I D E NG I N E E R @marcospaulosd B R E T E R I C K S O N A N D R O I D E NG I N E E R I NG M A N AG E R linkedin.com/in/breterickson/

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MV V M & N E S T E D F R AG M E N T/ V I E W S - V I E W M O D E L CO N T R AC TS M A R C O S DA M A S C E N O S R . A N D R O I D E NG I N E E R @marcospaulosd B R E T E R I C K S O N A N D R O I D E NG I N E E R I NG M A N AG E R linkedin.com/in/breterickson/ T H A N K YO U

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MV V M & N E S T E D F R AG M E N T/ V I E W S - V I E W M O D E L CO N T R AC TS M A R C O S DA M A S C E N O S R . A N D R O I D E NG I N E E R @marcospaulosd B R E T E R I C K S O N A N D R O I D E NG I N E E R I NG M A N AG E R linkedin.com/in/breterickson/ T H A N K YO U http://bit.ly/
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