Example of combination recommended by Google libraries

Related tags

Code examples MVI-RecyclerView-Coil-Hilt-Espresso-JUnit
Overview
  • Project description

This project includes several widely used libraries and shows how to deal with them in connection.

Project created as multilayer project with domain, presentation and repository layer. Why different layers:

  1. We can split the logic of the app
  2. We can do tasks of the same feature in parallel
  3. We can unbind network and presentation layers
  4. Code became more testable
  5. Different layers can be put in separate modules
  6. Easier to inject objects

Project uses Hilt as dependency injection tool. Why Hilt:

  1. Recommended by Google
  2. Extension of well-known Dagger
  3. Easier in testing
  4. Can catch errors on build step

Project uses navigation for transitions between the fragments. Why navigation:

  1. Easier way to manage transitions between fragments
  2. Easier way to pass parameters between fragments
  3. More predictable behavior base on visualization
  4. Navigation controller can be found in any place(for example it's possible to navigate from the ViewModel)

Project uses Coil for image presentation. Why Coil:

  1. Written on Kotlin and based on coroutines
  2. Adds to final build less methods
  3. Takes care about caching of images
  4. Has reach image-transformation possibilities and another functionality

To provide access to the view inside fragments and activity was used view binding. Why view binding:

  1. Easy to get access to any view
  2. Works faster then findViewById()
  3. Reducing the number of internal variables inside classes

All this allow me to create clean and transparent code where easy to find any logic and write tests for any part of code. Click event flow implemented with custom solution, probably already exist recommended way (needs to be investigated). Couple of places still have to be changed:

  1. Not implemented possibility to put in DiffUtils parameter to sort items in the list.
  2. Not finished instrumentation tests to check network use-cases and some UI use-cases.
  3. Would be nice to scroll to last clicked position after user returns from details fragments.
Comments
  • Implementation of presentation layer

    Implementation of presentation layer

    1. I've used the MVVM design pattern here. It allows not to care about screen rotation.
    2. As I decided at the beginning of this task I implemented pagination with Diffutils. It helps to simplify the process of sorting in the future. Also, the paging library takes care of items updates and does network requests in corresponded time. In reality, it would be nice to cache loaded data to the DB witch is also supported by the Paging library.
    3. Navigation makes the transition between fragments easier. It's clear how to pass data from one to another. I would implement a mechanism of a scrolling list of items to the last clicked item after the user comes back from the details fragment. It's also can be done with navigation.
    4. It was not enough time to finish the instrumentation tests but I can finish them a bit later.
    opened by denist2001 0
  • Repository layer is ready for use.

    Repository layer is ready for use.

    I've used Retrofit as the basement of network interactions. Pagination takes care of updating from the network. Added Mockk library for unit test purposes. Coroutines moved to the test thread with Jetbrains's library.

    opened by denist2001 0
  • Domain layer convert data from repository data model to presentation data layer

    Domain layer convert data from repository data model to presentation data layer

    As we have a possibility to get items one by one, we can reduce traffic for the user by requesting only the needed number of items. For this purpose, I want to use Pagination. It helps me to postpone this work(control of updates and getting new items) to external library. This commit prepare network and presentation data models for upcoming conversion from one layer to another.

    opened by denist2001 0
  • Apps layers was created.

    Apps layers was created.

    Why different layers:

    1. We can split the logic of the app
    2. We can do tasks of the same feature in parallel
    3. We can unbind network and presentation layers
    4. Code became more testable
    5. Different layers can be put in separate modules
    6. Easier to inject objects
    opened by denist2001 0
  • Task/add navigation tree

    Task/add navigation tree

    Why navigation:

    1. Easier way to manage transitions between fragments
    2. Easier way to pass parameters between fragments
    3. More predictable behavior base on visualization
    4. Navigation controller can be found in any place(for example it's possible to navigate from the ViewModel)
    opened by denist2001 0
Owner
Denis
Denis
GitHub
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