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Jerzy Chałupski - Offline mode in Android apps
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Base Lab
January 15, 2014
Programming
3
470
Jerzy Chałupski - Offline mode in Android apps
A talk delivered at KrakDroid 2013 conference.
Base Lab
January 15, 2014
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Transcript
! Jerzy Chalupski chalup, futuresimple " jerzy.chalupski@gmail.com Offline mode in
Android apps Base CRM http://porcupineprogrammer.blogspot.com/ #
WHAT WHY HOW
WHAT is offline mode?
What happens when you send and email from Gmail app?
What happens if your connection is down?
What happens if your connection is down?
None
RECAP Offline mode = fully functional app without connection
WHY should I bother?
Life is too short to worry about the internet connection.
I had to watch the animated circle for 2 seconds.
They want to post the photos of their dinner on
Instagram! People want to DO THINGS!
SLOOOOOOW TIMEOUTS RETRYS NETWORK ERRORS HANDLING LIT SCREEN DATA PLAN
USAGE
ˑˑˑˑ˒ “Unbearably sloooooow.”
ˑˑˑˑ˒ “Drains my battery.”
ˑˑˑˑ˒ “Crashes all the time.”
None
RECAP BETTER UX
RECAP BETTER UX BETTER BATTERY LIFE
RECAP BETTER UX BETTER BATTERY LIFE BETTER CODE
RECAP BETTER UX BETTER BATTERY LIFE BETTER CODE
HOW do I implement it?
UI Http Client
UI Http Client SLOW FLAKY
UI Http Client SLOW FLAKY CACHE ALL THE THINGS!
Http Client SLOW FLAKY Storage FAST RELIABLE UI
Storage Http Client SLOW FLAKY UI FAST RELIABLE GET
Http Client SLOW FLAKY Storage FAST RELIABLE UI GET POST
Sync Service Http Client UI Storage GET POST
AbstractThreadedSyncAdapter Http Client UI ContentProvider SQLite DB CursorLoader
Sync Service Http Client UI Storage
Sync Service Http Client UI Storage
Sync Service Http Client UI Storage
BACKEND MOBILE
BACKEND MOBILE
BACKEND MOBILE
BACKEND MOBILE
BACKEND MOBILE
BACKEND MOBILE
BACKEND MOBILE
BACKEND MOBILE
BACKEND MOBILE
BACKEND MOBILE
BACKEND MOBILE
BACKEND MOBILE
BACKEND MOBILE 250k items?
BACKEND MOBILE ?
BACKEND MOBILE
BACKEND MOBILE
BACKEND MOBILE OFFLINE MODE = DATA MIGRATIONS
As pleasant as data migrations with SQLiteOpenHelper.
BACKEND MOBILE 1 2 1 2
BACKEND MOBILE 1 2 1 2 3
BACKEND MOBILE 1 2 1 2 3 3
BACKEND MOBILE 1 2 1 2 3 3 3
BACKEND MOBILE 1 2 1 2 3 3 3
BACKEND MOBILE 1A 2B 1 2
BACKEND MOBILE 1A 2B 1 2 3
BACKEND MOBILE 1A 2B 1 2 3 C
BACKEND MOBILE 1A 2B 1 2 3 C C
BACKEND MOBILE 1A 2B 1 2 3 C 4C C
BACKEND MOBILE 1A 2B 1 2 3 C 4 3
4C
BACKEND MOBILE 1A 2B 1 2 3 4 3 4C
BACKEND MOBILE 1A 2B 1 2 3 4 3D 4C
BACKEND MOBILE 1A 2B 1 2 2 3C 3
BACKEND MOBILE 1A 2B 1 2 2 2 3C 3
BACKEND MOBILE 1A 2B 1 2 2 D 2 3C
3 ?
BACKEND MOBILE 1A 2B 1 2 2 D 2 3C
3 D
BACKEND MOBILE 1A 2B 1 2 2 D 2 3C
3 D
BACKEND MOBILE 1A 2B 1 2 2 D 2 3C
3 D
BACKEND MOBILE 1A 2B 1 2 2 D 2 3C
3 D D
BACKEND MOBILE 1A 2B 1 2 2 D 2 3C
3 D 4D D
BACKEND MOBILE 1A 2B 1 2 2 D 2 3C
3 D 4D 4D
4D BACKEND MOBILE 1A 2B 1 2 2 2 3C
3 D 4
4D BACKEND MOBILE 1A 2B 1 2 2 2 3C
3 4 4
4D BACKEND MOBILE 1A 2B 1 2 2 2 3C
3 4 4
“My friend, you’re entering a world of pain” WALTER SOBCHAK
UUID
RECAP OFFLINE MODE = MIGRATIONS
RECAP UUID OR WORLD OF PAIN OFFLINE MODE = MIGRATIONS
Sync Service Http Client UI Storage
Sync Service Http Client UI Storage
“For every complex problem there is an answer that is
clear, simple and wrong.” HENRY LOUIS MENCKEN
Sync Service Http Client UI Storage CONFLICTS
Sync Service Http Client UI Storage CONFLICTS DUPLICATES
Sync Service Http Client UI Storage CONFLICTS HANDLING LARGE DATA
SETS DUPLICATES
Sync Service Http Client UI Storage CONFLICTS HANDLING LARGE DATA
SETS DUPLICATES BATTERY USAGE
None
!futuresimple chalup
?
Thanks.