Android Developer Roadmap 2023

The Android Developer Roadmap 2023 includes 29 practical exercises that cover all the essential concepts used in day-to-day development.

Guidelines

Before starting any practical it's important to conduct research and learn the necessary concepts.
As you progress through the practical exercises, make sure to apply the new knowledge you've gained in subsequent exercises.
Follow android material guideline for the best practices of user interface design
Follow the recommendations for Android architecture

The references provided are aimed at individuals who have no prior knowledge or experience in developing Android apps. They serve as a starting point for beginners in the field, providing basic knowledge that is necessary before diving into Android development. If you already have knowledge and experience in Android development, you may not need to refer to the provided resources.

Develop your app's layout
Introduction to activities
- The activity lifecycle
Jetpack compose
App Architecture
- Guide to app architecture
- Best practices and recommended Architecture
Udemy courses - Android App Development Masterclass
Kotlin style guide

Android XML

Practical 1

Develop UI for a Messaging application

Implement an app using 3 Activities - Onboard, signIn and Home Activity
On the onboard screen, show brief introduction to the app's features, such as messaging, voice and video calls, and file sharing.
- Show images, titles and subtitles to introduce app functionality.
- Add a button to check the next/previous features. Also, the skip button to skip the onboarding flow.
On the sign-in screen, allow the user to enter their email and password, and add validation to ensure the user enters a valid email address and password.
- Use dummy email/password to verify user input.
After a successful login, the user should be redirected to the Home screen.
- On the Home screen, show a list of chats with sender name, profile, latest message and message time.
- The user should not be able to go back to the login screen once redirected to the Home screen.
- Use dummy data for chats
- Add toggle button on Home screen to change the day/night theme
App should responsive for different resolutions.
Add support for day/night theme.
You can use any images or placeholder to make UI eye-catchy
App should follow material guidelines
Here's UI for refrence

Practical 2

Develop collapsing toolbar for the News application

Home screen should show toolbar and news content
The toolbar on screen should initially display the app's logo and title.
As the user scrolls down to read news, the toolbar should collapse to provide more space for the content.
- You can use any dummy text/images as article content.
When the user reaches the end of the news and reverses scrolls, the toolbar should re-expand and display the app's logo & title
You can use any images or placeholder to make UI eyecatchy
App should follow material guidelines
Here's UI for reference

Practical 3

Implement Survey application

App will have one activity
On the Home screen display a survey form
- Survey form should show questions, 4 options and a button for next question.
- Show progress as user answers the question
Once the survey is completed, show a pop-up message thanking the user
- Use the custom dialog to thank the user.
- Dialog will have UI to show a thanks message, image and button to complete survey
Asks at least 3 questions with 4 options each.
App should ask users about the shopping experience.
You can use any images or placeholder to make UI eye-catchy
App should follow material guidelines
Here's UI for reference

Android Activity

Practical 4

Implement Video player

This will be single Activity app
- App should have a view to show Video
- One button to play and pause video
The player should follow the activity lifecycle, pause the player when the activity goes to the background and resume it when the activity returns to the foreground.
The player should also release resources when the app is no longer alive.
An application can play a video from local resource.
Use Exoplayer or MediaPlayer to play media

Practical 5

Implement SnapCam

This will be Two Activity app
Home screen should have PreviewView to show camera
- It should have button to capture image
- Button to show captured image preview
- Save button on Toolbar to save captured image to the device's gallery.
On Preview Screen show image in fullscreen
- Use Glide or coin for image preview
- Add button to go back to camera screen
The camera resources should be release when the activity is no longer alive.

Practical 6

Implement Note-taking application

Single activity app
- Which allows the user to enter a note
- Use EditText to take input from the user.
- Add a button to reset the note.
The application should have the ability to maintain the state of the EditText field, even after the device is rotated.
This means that when the user rotates the device, the EditText field should retain its previous contents, and the user should be able to continue editing the note without losing any data.

Fragment

Practical 7

Develop a Travel application

Implement the app using one activity only
Home screen should have a bottom bar with 3 tabs: Destinations, Search, and Settings.
The Destinations tab should display a list of popular travel destinations with images and descriptions.
The Search tab should Allow the user to search for destinations
- Add search view to search different destination
- Show a message in TextView to notify the user when the searched destination is not available
- Use dummy data for destinations
The Settings tab should allow the user to customize app settings
- Add a toggle button for notification and day/night theme settings.
App should preserve the state on tab change
- If the user scrolled to the bottom of the destinations screen, it should preserve the scroll state across the tab change.
- If a user searches for something on the search screen, the search result should be there when navigating to the search tab from other tabs.
- If the user changed the setting's toggle, it should stay as it is when the user navigate between the tabs

Practical 8

Develop RecipeLister application

Single Activity app with two fragments - Home & detail fragment
On the Home fragment add RecyclerView to display the list of recipes.
- Each list item should show the recipe name and a short description.
- Tapping a recipe should open Detail Fragment.
On the Detail fragment show full recipe detail with recipe image and description
- Add a back button to navigate back to the list of recipes.
Use dummy data for recipes

Practical 9

Implement App Browser

Single Activity app with two fragments - Home & browser fragment
On the Home fragment add an input field where the user can enter a URL and a button to open URL inside the app.
Once the user enters a valid URL and clicks the button, slide up the Browser fragment from the bottom of the screen
- This fragment will show the content of the URL within a web view.
- The fragment will also have a button to close it.
- Add a menu in the action bar, which will have two options- copy and share the link
  - Copy option should copy the link to the clipboard
  - The share option should allow users to share links in other applications
The state of the fragment should be preserved on configuration changes such as screen rotation.

Intent

Practical 10

Develop QuickSend application

This will be single Activity app - QuickSendActivity
QuickSendActivity allows users to send emails
- Add EditTextxs to input the receiver's email address and email content.
- Add a button to send email
  - On click of it, the app should ask for the app to choose to send mail on.

Practical 11

Develop the TalkEasy application

The app will send and receive messages between two activities.
The app will use two Activities - Sender & Receiver Activities.
The Sender activity should have an edit text and a send button
- When the user enters a message and clicks on the send button, open Receiver activity and show the message recieved from Sender Activity.
The Receiver activity should have an edit text and a reply button
- When the user enters a reply message and clicks on the reply button, the replied message should be sent back to the Sender activity and displayed in a text view.

Practical 12

Create Deep Links to App Content

Implement an app that handles incoming link
The app will use one Activity- Home Activity
On Click of this link https://open.my.app?message={anymessage} from anywhere, the system should open Home Activity and show the message from a link
Use intent filter in manifest to handle deep link

Android Jetpack Compose

Practical 13

Implement user profile UI

The app will use a one Activity
Display a user's profile picture, name, and bio.
Use a placeholder for the image and profile data.
Add day/night theme support
Here's UI for reference

Practical 14

Develop an interactive UI for the Fitness application

App will provide a guided introduction to the app's features and functionality
The app will use one Activity
The onboard composable should include a welcome message and an introduction to the app's primary features, such as tracking workouts, setting goals, and accessing workout routines.
- The onboard screen should have interactive elements such as buttons or sliders that allow the user to interact with the onboard screen
  - There should be next & previous buttons to go through features
  - Add an indicator to show pages
  - Add an option to skip the onboarding process.
After onboard flow completion navigate user to the Home composable
- Home composable should show basic tips & tricks related to fitness
- Add option to log out, on logout show onboard view.
Here's UI for reference

Practical 15

Develop MathQuest quiz application

The app will have one quiz Activity
The home composable should be an entry point of the app
- This should provide an introduction to the quiz and a button to start the quiz.
The quiz should ask 10 questions, one at a time, and provide four answer options for each question.
- On click of the next button highlight the correct/wrong answer and show the next question
- Show progress as the user answers the questions
After the user answers all questions, the app should display a result view
- Which shows the number of correct answers and the total number of questions.
- Show the excellence level based on the score such as poor, good and very good.
- Add a button to restart the quiz so that the user can play again.
Implement day/night theme in the Quiz app
You can use images and placeholders to build eye-catchy UI
Here's UI for reference

Networking

Practical 16

Develop ImageSaver application

Allow users to download an image from a given URL, display the image on the screen, and store the downloaded image file in the device's internal storage.
The app will use a one Activity
- Screen will have one Text field to enter the URL
- Buttons to download images and cancel downloads
- Show download progress in the progress bar
- Show download progress in the notification
- Show the downloaded image on full screen, once the download succeed
- Add a button to save downloaded images in Gallery.
Use Retrofit for networking

Practical 17

Implement OnlineUserDirectory

The app will use one Activity
- Main composable should show list of users, retrieved from API.
- Use LazyColumn to show users
- Show summary of user in the list including name, image and email
- GET Api Url : http://jsonplaceholder.typicode.com/users
On the user item click, display all albums of user on the next screen.
- Use GridView to show albums
- Show placeholder image for an album to make UI eye-catchy
- GET Api Url : https://jsonplaceholder.typicode.com/albums?userId=1
On the Album item click, show all photos of album on the next screen.
- Use GridView to show photos
- Show thumb image in Grid
- Use glide or coil to show the image
- On click of items show image in full screen
- GET Api Url : http://jsonplaceholder.typicode.com/photos?albumId=2
Use Retrofit for networking

App Architecture

Practical 18

Create My Journal application

Enable users to Add their daily thoughts, feelings, experiences, and ideas.
The app will have a one Activity
- Show user's thoughts in Grid
- Add TextField to take user input
- Add a button to save the user's thought
- Store inputs in ViewModel as state
User should be able to add multiple thoughts
The application should be able to persist data even when there is a configuration change, such as screen rotation.
Use MVVM app architecture

Practical 19

Implement Drink Explorer

Allow users to search for their favourite mocktail detail.
The app will have one Activity
- Add a search bar that allows users to search for mocktails by name
- GET Api Url : https://www.thecocktaildb.com/api/json/v1/1/search.php?s={vodka}
- Default search text should be vodka. That means initially showing Vodka in the search bar and fetching vodka using API
When the user taps on a mocktail, the application should display the ingredients and detail of mocktail.
- Api for getting ingredients and detail of mocktail: www.thecocktaildb.com/api/json/v1/1/lookup.php?i={itemId}
- Use placeholder and dummy data if required
Use MVVM app architecture

DataStore

Practical 20

Develop Authentify

An application that takes user credentials and basic information of a user and navigates to the home screen after a successful login.
The app will have one Activity
- First, the app will show the register form
  - Take the user's name, email and password for login
  - Other basic information such as an address, DOB, blood group and gender etc.
  - Add validation for email and password
  - Save user detail in DataStore
- After registering, show a login form
  - Take email and password
  - Check whether the user is available or not. If the user does not exist, notify user to do registration
  - Add validation for email
Once the user logs in, the app should always show the home screen
- It will show user details
- Add logout & delete user option in the toolbar
- Clear user session on logout
- Until the user logs out app should show the home screen.
- When the user clicks the logout/delete user button, the app should clear/delete the user session and navigate back to the login screen.

Local Storage

Practical 21

Develop EmployeeHub application

Build app using one activity
The application should display a list of employees on the home screen
- Show basic details including their name and job title.
When a user clicks on an employee from the list, the application should display their full details
- including their contact information, job title, and other important information.
The user should be able to add new employees to the directory by entering their basic information and saving it locally.
- Save employee name, email, contact info, job title, address, DOB and blood group etc.
Additionally, the user should be able to update an employee's information by selecting them from the employee list and editing their details.
Finally, an employee should be deleted by swiping to delete from the home screen
Use SQLite to store data locally
Use MVVM app architecture

Practical 22

Implement MinionSpeak application

Allow users to translate English text to the language of the minions and display the translated text on the screen.
Build app using one activity
On the Home screen
- Add a text field to enter the English text.
- Add a button to translate. On click of a button make an API call.
- Once the translation is complete, the translated text should be displayed on the screen in the language of the minions.
- GET Request API with query parameter- “text” https://api.funtranslations.com/translate/minion.json?text=”banana”
Additionally, the application should store the translation history locally so that users can access their previous translations.
Add fab button to check history on the home screen
Add an option to delete the history
Use Room database

Dependency Injection

Practical 23

Implement University directory application

Allow users to browse and search universities from all around the world.
On Home screen
- Add a dropdown to select the country
- When a country is selected, display a list of universities located in that country from API.
Use Hilt for dependency injection
GET Request API - http://universities.hipolabs.com/search?country={country name}
Write Unit test for viewModel

Practical 24

Implement offline-first StoreMate product application

GET API - https://fakestoreapi.com/products
Build app using one activity
On Home screen
- Retrieve the list of products from an API and displays it to the user using LazyGrid.
- Show product name, image and button to favourite/unfavourite product
Allow the user to view the product by clicking on it.
- Show all detail of the product
- Add option to favourite/unfavourite the product
Add an option on the home screen to view favourite products
- Show all favourite products
- Add option to remove from favourite
- Add option to remove all favourite item
- Use can select multiple items with a long click and can remove all selected products from their favourite.
The application should have offline functionality, allowing the user to continue browsing products even when they do not have an internet connection.
The product data should be first fetched from the local database and then sync with remote API data.
Add swipe-to-delete functionality to remove products from local storage
Add swipe-to-refresh functionality to refresh the local database with remote data
Write Unit test for viewModel

Kotlin Coroutine & Flow

Practical 25

Implement count-down timer application using Kotlin coroutine.

Build app using one activity
On Home screen
- Add text fields to take user input for hours, minutes and second
- Button to start/stop the timer
- Show remaining & elapsed time
The user should be able to set the duration of the timer and start it.
When the timer ends, the app should display a notification to indicate that the time is up.
Also play sound and vibrate device on timer completes
Write Unit test for viewModel

Practical 26

Implement a VocabVault app

Allow users to search for the definition of any word in the English language.
Build an app using one activity
On the Home screen
- Users should be able to search for a word by typing it into a search bar
- App should display as user type in the search view
- The app should display the word's definition along with pronunciations, parts of speech, examples, and synonyms.
- Add option to play pronunciations of word
Make sure the app will not make unnecessary API calls while typing in search view
- Use debounce using Kotlin coroutine to avoid extra API calls
Use Kotlin coroutine
API - https://api.dictionaryapi.dev/api/v2/entries/en/
Write Unit test for viewModel

Practical 27

Create a Contact Keeper application.

Build an app using one activity
On the Home screen
- Show all Contacts on the home screen
  - Show name, phone number and profile
  - On click of contact show the contact profile
- Add option to update contact detail
- Add an option to delete a user by swiping to delete
- Add option to add contact with person name, multiple phone numbers, profile image, blood group and address
Add screen to edit/show contact detail
- Add option to delete contact
The app should also update contacts in real-time, so changes made by one user are reflected across all devices.
Use Firestore to store contact details.
Use Kotlin flow to get a real-time update
Write Unit test for viewmodel

Broadcast receiver & task scheduling

Practical 28

Create Stand Up! application

Remind users to stand up and walk around every fifteen minutes.
Build an app using one activity
On the Home screen
- Add a Toggle button to turn alarm on and off
- Add option to set reminder start time
  - Open Timepicker to select reminder start time
The application should display a notification when fifteen minutes have passed since the last reminder.
Use the Android AlarmManager to schedule reminder notifications.

Android Service

Practical 29

Create a Music player application

Allow users to play multiple songs.
Build an app using one activity
On the Home screen
- Show a list of songs from the device
- On click of the song open player from the bottom
- Show play indicator for current playing song
On the Player screen
- Show song thumb image if available or use placeholder
- show song name
- Add option to play/pause the song
- Add options to play the next/previous song
- Add options to forward/backwards song by 10 sec
Use an Android Service to play music in the background and show a notification of the current music being played.

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