Sync on Android

SyncON ANDROID

Jerzy Chalupski

chalup

jerzy@futuresimple.com

What we do in general...

What we do ALL THE TIME

sync, sync, sync, sync

SyncON ANDROID

OVERVIEW ARCHITECTURE

CONTENT PROVIDER PITFALLS & PROTIPS

SyncON ANDROID

Not exactly the fresh topic...

„Developing Android REST client applications”

by Virgil Dobjanschi@Google I/O 2010

„Synchronizacja danych z serwisamiwebowymi w Androidzie”

by Bartosz Filipowicz@KrakDroid 2011

...but there is still much confusion

„Synchronizacja danych z serwisamiwebowymi w Androidzie”

by Bartosz Filipowicz@KrakDroid 2011

ContentProvider

ContentResolver

SyncManager

SyncAdapter

Authenticator

AccountManager

„Wat? Why do I need to write all this crap, sync is just fetching data from server”

typical reaction

Sync provides data sharing

offline mode

responsive UI

offline mode

responsive UI

GREAT UX

SyncON ANDROID

ContentProvider 101: CRUD

CREATE

UPDATE

DELETE

insert()

query()

update()

delete()

ContentProvider 101: URI

content://com.futuresimple.krakdroid.Provider/datasets/1

ContentProvider 101: notifications

content://com.futuresimple.krakdroid.Provider/datasets/1content://com.futuresimple.krakdroid.Provider/solutionscontent://com.futuresimple.krakdroid.Provider/solutions/1content://com.futuresimple.krakdroid.Provider/solutions/1/answers/1content://com.futuresimple.krakdroid.Provider/solutions/1/answers/2content://com.futuresimple.krakdroid.Provider/solutions/2/answers/1

ContentResolver.notifyChange(“content://com.futuresimple.krakdroid.Provider/datasets/1”);

ContentResolver.notifyChange(“content://com.futuresimple.krakdroid.Provider/solutions/1/answers/1”);

SyncON ANDROID

ContentProvider

ContentResolver

SyncManager

SyncAdapter

Authenticator

AccountManager

addAccount()

ContentResolverSyncManager

SyncAdapter ContentProvider

Authenticator

Sync architectureCREATING NEW ACCOUNT

AccountManager

addAccount()

Authenticator

AccountManager

addAccount()

Authenticator

AccountManager

ContentResolver

ContentProvider

Sync architecture SHOW SYNCED DATA

Authenticator

query()

SyncManager

SyncAdapter

AccountManager

ContentResolver

SyncManager

Sync architecture REQUEST SYNC

Authenticator

getAccountsByType()

AccountManager

ContentResolver

SyncManager

Authenticator

getAccountsByType()

requestSync()

AccountManager

ContentResolver

SyncManager

Authenticator

getAccountsByType()

requestSync()

onPerformSync()

AccountManager

ContentResolver

SyncManager

Sync architecture EDIT DATA

Authenticator

insert()

AccountManager

ContentResolver

SyncManager

Authenticator

insert()

insert()notifyChange()

AccountManager

ContentResolver

SyncManager

Authenticator

insert()

AccountManager

ContentResolver

SyncManager

Authenticator

getAccountsByType()

insert()

AccountManager

ContentResolver

SyncManager

Authenticator

getAccountsByType()

onPerformSync()

insert()

AccountManager

ContentResolver

SyncManager

Sync architecture POST NEW DATA

Authenticator

onPerformSync()

AccountManager

ContentResolver

SyncManager

Authenticator

getAuthToken()

onPerformSync()

AccountManager

ContentResolver

SyncManager

Authenticator

getAuthToken()

query()query()onPerformSync()

AccountManager

ContentResolver

SyncManager

Authenticator

getAuthToken()

query()query()

onPerformSync()

AccountManager

ContentResolver

SyncManager

Sync architecture GET NEW DATA

Authenticator

onPerformSync()

AccountManager

ContentResolver

SyncManager

Authenticator

getAuthToken()

onPerformSync()

AccountManager

ContentResolver

SyncManager

Authenticator

getAuthToken()

onPerformSync()

AccountManager

ContentResolver

SyncManager

Authenticator

getAuthToken()

applyBatch()

onPerformSync()

AccountManager

ContentResolver

SyncManager

Authenticator

getAuthToken()

applyBatch()notifyChange()

applyBatch()

onPerformSync()

AccountManager

ContentResolver

SyncManager

Authenticator

getAuthToken()

applyBatch()notifyChange()

applyBatch()

onPerformSync()

onLoaderFinished()

AccountManager

ContentResolver

SyncManager

Authenticator Sync architecture WIN #1: NO REMOTE I/O IN UI

AccountManager

ContentResolver

SyncManager

Authenticator Sync architecture WIN #2: SYNC SCHEDULING

SyncON ANDROID

IDs in ContentProvider URIs

Plan A: Use local IDs! (BaseColumns._ID)

ISSUE: still need server-side IDs for relations

ISSUE: still need server-side IDs for relationsISSUE: conversions between server and local IDs

Plan B: OK, use server-side IDs!

ISSUE: what about offline mode?

content://com.futuresimple.krakdroid.Provider/datasets/-42

Plan C: OK, let’s mix things up!

content://com.futuresimple.krakdroid.Provider/datasets/-42

Plan C: OK, let’s mix things up!

ISSUE: very tricky implementation

content://com.futuresimple.krakdroid.Provider/datasets/GUID

Plan D: GUID

content://com.futuresimple.krakdroid.Provider/datasets/GUID

Plan D: GUID

ISSUE: needs support on the backend

ContentResolver requestSync() vs. notifyChange()

requestSync(account, authority, extras)

notifyChange(uri, observer, syncToNetwork)

ContentResolver requestSync() vs. notifyChange()

requestSync(account, authority, extras)

notifyChange(uri, observer, syncToNetwork)

Deleting an account

From your app

From system settings

From 3rd party app

Deleting an account

From your app

From system settings

From 3rd party app

“Where should I perform user

data cleanup?”

Deleting an account

@Override getAccountRemovalAllowed()

Deleting an account

@Override getAccountRemovalAllowed()

CONS: depends on current Settings implementation.

PROS: exactly the thing you need.

Deleting an account

Deleting an account

CONS: only info about existing accounts.

PROS: peace of mind.

Sync lifecycle

Happy case:

Sync lifecycle

Happy case:

requestSync()

onPerformSync()

Sync lifecycle

requestSync()

Happy case:

onPerformSync()

Sync lifecycle

requestSync() onStatusChanged()

Happy case:

onPerformSync()

Sync lifecycle

Not-so-happy case:

requestSync() onStatusChanged()

onPerformSync()

Sync lifecycle

Not-so-happy case:

onStatusChanged()requestSync()

onPerformSync()

Sync lifecycle

Not-so-happy case:

requestSync() cancelSync()+

onStatusChanged()

Futureproof your sync

1. Be lenient on GET

2. Be strict on POST

3. Have resync in v1.0

2. Be strict on POST

Thanks.

Sync on Android

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