Develop Apps Super

fast with Android

Jetpack!

Divya Jain @divyajain2405 Valley Devfest 2018

Put the pieces of the puzzle together...

To create something beautiful , user friendly & serves a purpose

Challenges in Android Dev● Tons of Boilerplate Code

● Clean Architecture

● Testing

● Backward compatibility

Who wants to build robust high

quality production ready apps in an accelerated manner?

Android Jetpack!

What is it?● Collection of individual software components -

libraries and tools● Independently adoptable● Built to work together ● Unbundled from Platform APIs

FOUNDATION

AppCompat

Android KTX

Mul

tidex Testing

* Core System Components *Kotlin *Backward Compatibility *Testing Libraries

UI

Layout

Fragment

Palette

Emoji

Animations and Transitions

Auto TV Wear

* Widgets and helpers

*Easy to use

*Enhanced User experience

ARCHITECTURE

Lifecycles Livedata

Paging

Navigation

WorkManager

Room

Viewmodel

Data Binding

*Clean & Recommended *Data Management *Robust, scalable & Maintainable

BEHAVIOUR

Notifications

Permissions

Sharing

Slices

Media & Playback

Download Manager

* Integrate with other Android services

*help interact with user

Foundation

UI

Architecture

Behaviour

Easier to Develop

Follow Best Practices

Reduces Boilerplate code

Simplify tasks

Reduces Memory crashes

Lessens memory leaks

Concentrate on the nitty gritty of Android platform

Focus on the Code you actually care about

AndroidX

New improved Android Support Library with consistent Namespacing , faster updates , feature parity & new libraries

androidx.*androidx.<feature>.ClassName

androidx.<feature>:<feature>-<sub-feature>

Migrate to AndroidXgradle.properties file :

Changes in Package and Maven Artifact names

https://developer.android.com/jetpack/androidx/migrate

FOUNDATION

AppCompat

Android KTX

Mul

tidex Testing

* Core System Components *Kotlin *Backward Compatibility *Testing Libraries

Android KTX

Kotlin

Extension Function

Null Safety

Default & named arguments

Higher order functions

Smart Cast

Leverages Kotlin Features

Optimizes Android APIs with Kotlin

Makes Android Development - concise - enjoyable - intuitive

Android KTXParse a string to a URI

val uri = Uri.parse(custom_string)

Val uri = custom_string.toUri()

import android.view.Menuimport androidx.core.view.getimport androidx.core.view.minusAssign

fun myFunction(menu : Menu) { val firstMenuItem = menu[0] //Gets the first menu item. menu -= firstMenuItem // Removes the menu item

}

Menu Class

● Core KTX● Fragment KTX● Palette KTX● Collections KTX● SQLite KTX● Navigation KTX

Build.gradle

implementation "androidx.core:core-ktx:$androidx_version"

UI

Layout

Fragment

Palette

Emoji

Animations and Transitions

Auto TV Wear

* Widgets and helpers

*Easy to use

*Enhanced User experience

Layout

ViewGroup

View ViewViewGroup

View View

<androidx.constraintlayout.widget.ConstraintLayout android:id="@+id/root_view" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/margin">

Fragment

● Dynamic and Flexible UI Designs

● Support different screens

● Reusable UI components

1.

implementation 'androidx.fragment:fragment-ktx:$currentVersion'

supportFragmentManager.transaction(now = false, allowStateLoss = false) {

replace(R.id.frag_container, myFragment,FRAGMENT_TAG) }

Palette API

1.

● Vibrant color

schemes

● Visually appealing

● Pick and choose

● Various layout

themes

fun createPaletteSync(bitmap: Bitmap):

Palette = Palette.from(bitmap).generate()

fun createPaletteAsync(bitmap: Bitmap) { Palette.from(bitmap).generate { palette

-> // Use generated instance }}

Emoji Compat

1.

● Device up to date with Latest

● No need to wait for OS updates 😄 ● Prevents showing missing ✋● Identifies emoji for a given CharSequence,

replaces them with EmojiSpan & renders ✅

Animations

1.

Visual Cue to notify users of changes!

● Informative

● Focus

● Expressive

ARCHITECTURE

Lifecycles Livedata

Paging

Navigation

WorkManager

Room

Viewmodel

Data Binding

*Clean & Recommended *Data Management *Robust, scalable & Maintainable

Architecture Components

● Separation of concerns

● Drive UI from model

● Persistence of data

● Independent testing

Paging

➔ Lazy Loading of Data

➔ Economical use of system resources

➔ Responsive to the user input without a lag

DataSource

DataSource Factory

ViewModelPagedList PagedList Adapter

Navigation Cool way to storyboard the app destinations!

Navigation

❖ Actions

❖ Animations

❖ Up/Back Behavior

❖ Passing Arguments

❖ Deep Links

WorkManager

Job Scheduler

Alarm Manager

Firebase JobDispatcher

Asynchronous Task

Constraints

Work Request

enqueues

Data Binding

Bind UI elements to the data sources programmatically

UI Framework methods

findViewById()

Bind UI elements to the data sources in a declarative format

Remove UI Framework methods

<TextView android:text="@{viewmodel.userName}" />

BEHAVIOUR

Notifications

Permissions

Sharing

Slices

Media & Playback

Download Manager

* Integrate with other Android services

*help interact with user

Want to download something?

Download Manager

● System service● Handles HTTP Downloads● Background● Handles interactions● Takes care of retrying

Want to share something?

ShareActionProvider

● Menu item● Handles appearance & behaviour● Needs a share intent

Want to Notify user?

NotificationCompat

● Info to user outside App● Informative/action oriented● Timely reminders● Frequent interruptions are

annoying

Permissions

<uses-permission>

● Privacy of user● Permission to access sensitive

user data● Dangerous permission on

demand

Slices

Embed App content in Google Search through flexible templates

TemplatedShow relevant app content in a dynamic, app theme user interface

InteractiveEnable user to perform inline, app actions, deep link, update, toggle

Modular

Valley Devfest 2018 App

Data---------------------------------------------

------------

User Interface

RepositoryModel View ViewModel

Livedata

Room

Fragments

Animations

LayoutsNavigation

Caching

NotificationsShareActionProvider

Android Jetpack has all the pieces needed for putting together the app

Choose and pick the ones you need, integrate

App is Ready in no time!

https://developer.android.com/jetpack/

Thank you!

Questions Please?Divya Jain @divyajain2405