Living on a green rocket field - DevFest Istanbul 2018

@alosdev DevFest Istanbul 2018
Living on a green rocket
field
Hasan Hosgel

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History

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2011/03 - 1st version Support Library with Fragments - Parallel ActionBarSherlock
Timetable
source: https://developer.android.com/topic/libraries/support-library/revisions

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2012/03 - Notification Compat
Timetable

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2013/07 - AppCompat, Media Router
Timetable

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2014/10 - RecyclerView, CardView
Timetable

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2015/08 - bunch of new libraries
Timetable

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2016/08 - split support libs
Timetable

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Timetable
2016/08 - split support libs
2017/06 - multidex
…

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What now?

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The King is dead - long live the king

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Welcome Jetpack

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android.support.v4.***
->
androidx.***
Except
com.google.android.material.***

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gradle.properties
android.useAndroidX = true
android.enableJetifier = true

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Jetpack components
● Foundation
● Architecture
● Behaviour
● UI

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Foundation libraries
● AppCompat
● Android KTX
● MultiDex
● Test
NEW

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Android KTX
Kotlin Extension for a bunch of jetpack libraries:
● Core-ktx
● Fragment-ktx
● Lifecycle-ktx
● Navigation-ktx
● …

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Architecture libraries
● DataBinding
● Lifecycles
● LiveData
● Navigation
● Paging
● Room
● ViewModel
● WorkManager
NEW
NEW
NEW

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Navigation
● Navigation Controller
● new resource type navigation
● “easily” define the navigation in a wysiwyg editor
○ also via xml

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Navigation graph
android:id="@+id/main_navigation_graph"
app:startDestination="@id/listFragment">
android:id="@+id/listFragment"
android:name="ist.devfest.navigation.ListFragment"
android:label="fragment_list"
tools:layout="@layout/fragment_list" />
android:id="@+id/detailFragment"
android:name="ist.devfest.navigation.DetailFragment"
android:label="fragment_detail"
tools:layout="@layout/fragment_detail" />

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Layout file

android:id="@+id/main_nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="true"
app:navGraph="@navigation/main_navigation_graph" />

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Navigation Editor
list detail

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Navigation graph
android:id="@+id/main_navigation_graph"
app:startDestination="@id/listFragment">
android:id="@+id/listFragment"
… >
android:id="@+id/action_to_detailFragment"
app:destination="@id/detailFragment" />

… />

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Navigation Editor
list detail

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Using NavigationController
view.findNavController()
.navigate(R.id.action_to_detailFragment)
button.setOnClickListener(
Navigation.createNavigateOnClickListener(
R.id.action_to_detailFragment, null
)
)
toolbar.setupWithNavController(navController)
collapsingToolbarLayout.setupWithNavController(navController)
navigationView.setupWithNavController(navController)
bottomNavigationView.setupWithNavController(navController)

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Parameterized navigation
android:name="ist.devfest.navigation.DetailFragment"
android:label="fragment_detail"
tools:layout="@layout/fragment_detail">
android:name="sessionId"
app:argType="string"
android:defaultValue="rocket_field" />

var bundle = bundleOf("sessionId" to "green_field")
view.findNavController().navigate(R.id.action_to_detailFragment, bundle)

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Parameterized navigation with TypeSafety
Build.gradle:
…
apply plugin: 'androidx.navigation.safeargs'
…
Caller side:
val action = actionToDetailFragment().setSessionId("green_field")
findNavController().navigate(action)
Consumer side:
DetailFragmentArgs.fromBundle(bundle).sessionId

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deeplinking
nav_graph:
android:id="@+id/detailFragment" … >
android:autoVerify="true"
app:uri="www.devfest.istanbul/session/{sessionId}" />

AndroidManifest:
android:name=".MainActivity">

…

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deeplinking
val deepLink = findNavController().createDeepLink()
.setDestination(R.id.detailFragment)
.setArguments(args)
.createPendingIntent()
val builder = NotificationCompat.Builder( context, channelId)
.setContentTitle("Navigation")
.setContentText("Deep link to Android")
.setSmallIcon(R.drawable.ic_clock)
.setContentIntent(deepLink)
.setAutoCancel(true)

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Navigation in Multi Modules/ - Features
base
A B C
app

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Navigation in Multi Modules/ - Features
base
A B C
app
feature_a_nav feature_b_nav feature_c_nav
main_nav
main_nav
base_nav

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base/main_nav
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/main_nav">

android:id="@+id/feature_a"
app:data="https://navigation.devfest.istanbul/a"
app:action="android.intent.action.VIEW"/>
…

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base/base_nav
android:id="@+id/base_nav">

…

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a/feature_a_nav
android:id="@+id/feature_a">

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app/main_nav
app:startDestination="@+id/base_nav"
android:id="@+id/main_nav">

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Paging
● PagedList as data object
● DataSource to serve PageList
● PagedListAdapter for RecyclerView

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Paging
● PagedList as data object
● DataSource to serve PageList
● PagedListAdapter for RecyclerView
Attention: if you want to manipulate the List itself that is not the way to go

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WorkManager
● Successor of JobScheduler, JobDispatcher & AlarmManager
● Not depending on Google play services (GMS)
○ Usage outside of Google ecosystem
● Defining constraints, when to run them ( charging, network, etc.)

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Worker
class CompressWorker(context : Context, params : WorkerParameters)
: Worker(context, params) {
override fun doWork(): Result {
// Do the work here
myCompress()
// Indicate success or failure with your return value:
return Result.SUCCESS
// (Returning RETRY tells WorkManager to try this task again
// later; FAILURE says not to try again.)
}
}

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Constraint
// Create a Constraints object that defines when the task should run
val myConstraints = Constraints.Builder()
.setRequiresDeviceIdle(true)
.setRequiresCharging(true)
// Many other constraints are available, see the
// Constraints.Builder reference
.build()

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Running them
// ...then create a OneTimeWorkRequest that uses those constraints
val compressionWork = OneTimeWorkRequestBuilder()
.setConstraints(myConstraints)
.build()
OR
val compressionWork =
PeriodicWorkRequestBuilder(12, TimeUnit.HOURS)
.setConstraints(myConstraints)
.build()
// Then enqueue the recurring task:
WorkManager.getInstance().enqueue(compressionWork)

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Worker chains
val chain1 = WorkManager.getInstance()
.beginWith(workA)
.then(workB)
val chain2 = WorkManager.getInstance()
.beginWith(workC)
.then(workD)
val chain3 = WorkContinuation
.combine(chain1, chain2)
.then(workE)
chain3.enqueue()

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Behaviour libraries
● Download Manager
● Media & Playback
● Notifications
● Permission
● Sharing
● Slices NEW

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Slices
● Currently not visible for users, but you can be first movers
● Like widgets for the home screen, just in other apps
● Supported API level 19 (KitKat) onwards
● Can be used with Actions

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UI libraries
● Animation & transitions
● Auto
● Emoji
● Fragment
● Layout
● Palette
● TV
● Wear OS by Google

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Jetpack - sample app
https://github.com/googlesamples/android-sunflower

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Wishlist for libraries/ SDKs
● Don’t force your user to a specific marshaller (GSON, Jackson, Moshi)
○ Offer the functionality like Retrofit and the ConverterFactory
● Don’t force your user to use Rx- there is a cool guy around => Coroutine
○ Droidcon Panel discussion “Rx must die!?”
● Don’t depend on bigger libraries, especially if just use a small part of it
● Add proguard config in your Jar/ Aar and don’t widen it to much

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Any Questions

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slides
https://bit.ly/rocket-field-ist

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Living on a green rocket field - DevFest Istanbul 2018

Living on a green rocket field - DevFest Istanbul 2018

Hasan Hosgel

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