FlickrFlow

An android app that tracks your walk with images every 100 meters:

• images fetched from Flickr based on location
• pictures are shown in a list, and user can scroll through the stream
• one button start/stop, on each start the previous stream of photos gets wiped

Please create a Flickr account and use your own api key. Add it in the FlickrService file.

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MVVM pattern with Clean architecture developed with Kotlin.

Clean architecture consists of three layers:

• Data, includes data objects, databases, network clients, repositories.
• Domain, includes use cases of business logic. This layer orchestrates the flow of data from Data Layer to Presentation and the other way.
• Presentation, includes UI related components, such as ViewModels, Fragments, Activities.

Android Jetpack Components used:

• Fragment
• ViewModel
• View Binding
• LiveData
• Room
• Location
• ActivityScenario, instrumentation testing (part of AndroidX Test)
• Espresso (UI tests)

Libraries:

• Koin, an easy-to-use DI framework. Nice comparison with Dagger
• Kotlin Coroutines
• fresco, an Android library for managing images and the memory they use
• Retrofit
• OkHttp
• moshi, JSON library for Kotlin and Java
• Timber, a logger which provides utility on top of Android’s Log class

Flickr API:

• flickr.photos.search

Sources:

• Google I/O 2018 app — Architecture and Testing
• Clean Architecture of Android Apps with Practical Examples
• Clean Architecture Guide (with tested examples): Data Flow != Dependency Rule