Build Modern Android App with REST API and Ktor Server

Manually create a Kotlin Ktor project in IntelliJ with Gradle Kotlin DSL, add Netty and Logback dependencies, and expose a hello world route.

Learn how to serve static content such as html, text, and images using a static function and a resources directory, with optional remote paths like assets.

Install and configure Ktor plugins, including call logging, content negotiation with json serialization, and routing via application class extension functions, plus coin and default headers with a cache control header.

Create the all heroes endpoint for the boruto app using Koin for dependency injection, with a cache-control header, and implement page query validation and API responses.

Define hero dao with dao and query annotations to read all heroes, fetch by id, and support insert and delete via burrito database using room and paging source.

Save the onboarding state when the user finishes the welcome flow. Navigate from splash to home or welcome screens using a welcome view model, Hilt, and use cases.

Create the API response model with serializable annotation and implement Boruto API endpoints for getting all heroes with a page parameter and for searching by name.

Explore the paging three library for Android, paginate data from room databases or APIs, load pages on scroll, and apply paging config, pager, and map and filter operations.

Implement a lazy column that displays two animated shimmer items during data loading and then renders the hero list when loading completes.

Implement initialize() in the remote mediator to use local cache when data is fresh and trigger a remote refresh after the cache timeout, based on last updated.

Demonstrates a details screen that uses a palette API to color the UI from hero images. Builds two custom components: info box and ordered list for a compose-based android app.

Design a background content composable for the details screen that loads a hero image from a base URL with an error placeholder and a top-right close icon.

Animate the bottom sheet radius with a value tied to the current sheet fraction, applying 40 dp to the top corners when collapsed and 0 when expanded via rounded corners.

Explore the palette API to extract colors into a palette with six profiles. Use swatches, the builder, and color helpers such as body text color and title text color.

Create a palette generator object to convert image URLs to bitmaps and extract vibrant, dark vibrant, and body colors for text, using coil's image loader and the palette API.

Create a fake burrito api to mock backend responses for testing the search heroes paging source, overriding search heroes logic with predefined heroes.

Test the search heroes paging source using a fake burrito API, validating single and multiple results, empty queries, and non existing heroes with JUnit and run blocking tests.

Create a second fake Boruto api for Android tests to support remote mediator testing, implementing get all heroes with paging logic and a calculate function for 1–5 pages.

Learn how to test a rating widget in Jetpack Compose by adding semantics, creating a compose test rule, and validating empty, half, and filled stars across multiple values.

Clean up the Android app and server, update dependencies, and resolve library conflicts. Refactor the splash screen, fix side effects, and simplify navigation and paging logic.

Learn to migrate a Ktor server from 1.6 to 2.0, updating dependencies and imports. Adjust Gradle and tests using testApplication and body as text.

Migrate from the deprecated accompanist swipe refresh and system ui controller by implementing pull refresh with a refresh state, updating status bar color via activity window, and noting deprecated dependencies.