README.md

Rankings ATP Tour Tennis - Hilt

The sample cover the following topics:

• Tips and Tricks using dependency injection in Android projects with Dagger & Hilt.
• UI Testing with Hilt Testing
• Screenshot Testing with Hilt Testing
• Flow & StateFlow

Dependency Injection

I collected tips and tricks that will help you get approaches used to apply DI in android apps.

Hilt is stable!

Hilt provides a standard way to use DI in your application by providing containers for every Android class in your project and managing their lifecycles automatically.

You can see my Hilt implementation on this example:

dagger-hilt-example

Learn Dependency Injection with Hilt

• Hilt is stable! Easier dependency injection on Android
• hilt-android - doc
• dependency injection on android with hilt - blog
• hilt - Android Dependency Injection - talk
• migrating to Hilt - doc
• android Hilt - codelab
• migrating your Dagger app to Hilt - codelab
• an opinionated guide to Dependency Injection on Android (ADS '19) - talk
• hilt — Adding components to the hierarchy - blog
• hilt-dagger.dev - doc
• android-hilt - example
• android-dagger-hilt - example

Dagger

There are a few ways you can create a ViewModel instance. Since it’s a lifecycle-aware component, it needs a reference of the lifecycle owner such as an activity or fragment, so the samples contain some practices commonly used on the Android community.

Goal	Example
Basic implementation using ViewModelProvider.Factory to instantiate ViewModels.	dagger-viewmodel-factory
Classic implementation to provide dependencies using constructor injection and modules	dagger-viewmodel-module
Avoid arguments in Dagger - Modules using BindsInstance	dagger-viewmodel-binds-instance
Provides a ViewModel using Multibindings	dagger-viewmodel-multibindings

Learn Dependency Injection with Dagger

(At this time probably you're an expert using dagger but if not these are great resources to deep in.)

• dependency Injection the masterpiece on Android - slides
• dagger - doc
• dagger google - talk
• dagger basics - android-doc
• dagger-android - example
• dagger-mvp - example
• dependency Injection - blog-spanish
• flexible dependency - slides

Testing

Screenshot Testing

./gradlew executeScreenshotTests

Instrumental Testing with Espresso

./gradlew connectedAndroidTest

Screenshot Testing + Instrumental Testing

./gradlew connectedCheck executeScreenshotTest

Maybe you noticed some test are pretty similar as:

showEmptyViewWhenThereAreNotPlayersScreenShot & showEmptyViewWhenThereAreNotPlayers

Instrumental Test
showEmptyViewWhenThereAreNotPlayers: is ensuring the view is shown

Screenshot Test
showEmptyViewWhenThereAreNotPlayersScreenShot: is ensuring the view is shown in the correct place on the screen

Yes, probably you can replace an instrumental test with a screenshot test in some scenarios in another ones you can be benefited from both.

Demo

Do you want to contribute?

Feel free to report or add any useful feature, I will be glad to improve it with your help.

Developed By

• Erik Jhordan Rey - erikjhordan.rey@gmail.com

License

Copyright 2020 Erik Jhordan Rey

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.