Android Study Jams Session 4

This work is licensed under the Apache 2.0 License
Android Study Jams
Session 4
T R Sai Rakshith
Technical Team Member

Let’s get started

Equipment needed for each student
० Computer
० Internet connection
० (Optional) Android device & USB cable
० Android Studio

Official tool to build Android apps
Android Studio

Android Emulator
Emulate an Android device on your computer.
Run your app on the emulator

० Basic computer literacy
० Basic math skills
० Computer & headphones
० Internet connection
० (Optional) Android device & USB cable
Prerequisites

Learning Objectives
० Build your first Android apps
० Set up Android Studio on your computer
० Learn the basics of the Kotlin programming language

What will you learn?
2
3
4
1 Introduction to Kotlin
Create your first
Android app
Build a basic layout
Add a button to an app
Learn to code in Kotlin, a modern programming
language that helps developers be more productive.
Learn to create and run your first Android app in
Android Studio.
Learn the basics of layouts in Android by creating your
very own birthday card app!
Learn how to use classes, objects, and conditionals to
create an interactive dice roller app.
Badges
Earn badges
at the end of each
pathway!
Android Basics

6
5 Get user input
Display a scrollable
list
Learn how to get user input within an app by building a
tip calculator app.
Learn how to display a list of text and images in an
app.
Badges
Android Basics
7
Navigate between
screens
Add another screen to your app by adding a second
activity.
8
Intro to Navigation
Component
Learn how the Jetpack Navigation component makes
it easier to manage navigation within your app.

10
9 Architecture
Components
Advanced
navigation examples
Learn good app architecture principles by building a
game app to unscramble words.
Combine what you’ve learned so far in a more
advanced app that demonstrates navigating
between multiple screens.
Badges
Android Basics
11 Coroutines Write code for more advanced and complex
Android apps.
12 Get and display data from
the internet
Retrieve and display images over the internet with
HTTP and REST.

14
13 Introduction to SQL,
Room, and Flow
Use Room for data
persistence
Learn the basics of reading and manipulating data with
SQL, and how to create and use relational databases in
an Android app with the Room library.
Use the Room library to allow your apps to read
and write from a database.
Badges
Android Basics
15
Learn when and how to use WorkManager, an API that
handles background work that needs to run regardless
of whether the application process is still running.
Schedule tasks with
WorkManager

Concept Overview

० Architecture provides you with the guidelines to help you allocate
responsibilities in your app, between the classes.
० A well-designed app architecture helps you scale your app and extend it with
additional features in the future.
० These components take care of some of the complexity of the lifecycle and
help you avoid lifecycle related issues.
App Architecture

० The ViewModel is a model of the app data that is displayed in the views.
Models are components that are responsible for handling the data for an
app.
० They allow your app to follow the architecture principle, driving the UI from
the model.
० The ViewModel stores the app related data that isn't destroyed when activity
or fragment is destroyed and recreated by the Android framework.
View Model

Adding View Model

० Activities in Android exist within tasks. When you open an app for the first
time from the launcher icon, Android creates a new task with your main
activity.
० A task is a collection of activities that the user interacts with when
performing a certain job (i.e. checking email, creating a cupcake order,
taking a photo).
Tasks

० Activities are arranged in a stack, known as a back stack, where each new
activity the user visits gets pushed onto the back stack for the task.
० You can think of it as a stack of pancakes, where each new pancake is
added on top of the stack.
० The activity on the top of the stack is the current activity the user is
interacting with.
० The activities below it on the stack have been put in the background and
have been stopped.
Tasks

Tasks

० A coroutine is an instance of suspendable computation.
० It is conceptually similar to a thread, in the sense that it takes a block of
code to run that works concurrently with the rest of the code.
० However, a coroutine is not bound to any particular thread. It may suspend
its execution in one thread and resume in another one.
Introduction to Coroutines

० HTTP is the protocol that allows for sending documents back and forth on
the web.
० A protocol is a set of rules that determines which messages can be
exchanged, and which messages are appropriate replies to others.
० In HTTP, there are two different roles: server and client. In general, the client
always initiates the conversation.
० The server replies. HTTP is text based; that is, messages are essentially bits
of text, although the message body can also contain other media
Introduction to HTTP

० REST is a simple way to organize interactions between independent
systems.
० It's been growing in popularity since 2005, and inspires the design of
services, such as the Twitter API.
० This is due to the fact that REST allows you to interact with minimal
overhead with clients as diverse as mobile phones and other websites.
० In theory, REST is not tied to the web, but it's almost always implemented as
such, and was inspired by HTTP.
० As a result, REST can be used wherever HTTP can.
Introduction to REST

THANK YOU

Android Study Jams Session 4

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