droidcon2020 Conference App

The official DroidconKE 2020 conference App.

Table of contents

1 About the App
2 General Preview
3 Technical
4 Work in Progress
5 Contributing
6 License
7 Versions
8 Contributors

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About the App

Android app for the 3rd Android Developer conference- droidcon to be held in Nairobi from August 6-8th 2020.

This project is the Android app for the conference. The app supports devices running Android 5.0+, and is optimized for phones and tablets of all shapes and sizes. The source reflects the app as at droidconKE 2020!

Features

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droidconKE 2020 Android App

Android app for the third Android Developer conference-droidcon in Nairobi 2020

This project is the Android app for the conference. The app supports devices running Android 5.0+, and is optimized for phones and tablets of all shapes and sizes.

Source

The source code in this repository reflects the app as of droidconKE 2020.

Features

App will have the following features:

• Sessions
• Feed
• About
• Home
• Speakers
• Auth
• Feedback

To learn how it was built, we put this series together:

(NOT YET OUT) - Coming soon! Building the droidconKE 2020 App

Like, share claps... 😉

General Preview

Screenshots

Coming soon!

Demo

a You can give it a spin here on appetize

b.Compile the project on android studio and run it.

c. download it from the playstore:

Technical

Running the project

1. Required to run project: check "dependencies" below

• Use Android studio 3.4 and later. It will be less messy.

2. Clone this repository:

`git clone https://github.com/droidconKE/droidconKE2020App.git`

3. open Project in Android Studio

4. Build Project

5. In case of an error when building project, update your gradle version, Build Tools download

6. Add the following credentials to your local.properties

clientId=GOOGLE CLIENT ID
clientSecret=GOOGLE CLIENT SECRET
apiKey=SERVER API KEY

Note: Reache out to @wangerekaharun or @michaelbukachi to obtain credentials

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Development Environment

The app is written fully in Kotlin and uses the Gradle build system.

To build the app, use the gradlew build command or use "Import Project" in Android Studio. A canary or stable version >= 3.4 of Android Studio is required and may be downloaded here.

Architecture

Proposed Architecture:

We will be using libraries, modules and dynamic feature modules too.

Architecture Introduction

We took a modularisation approach to develop the application. There are immense benefits that come about with modularising an application; faster builds due to gradle caching and parallelism, benefit of dynamic features which can be delivered on demand therefore reducing initial apk size, clear separation of concerns and ease of maintaining and adding new features. An application can be modularised either by feature or by layer, we decided to take a hybrid approach that combines both approaches.

Data Module

The data module provides support for data persistence and offline caching. It consists of room database, entities and daos. We opted for a single database source of truth as opposed to having multiple databases for each feature. At the point of developing this application, Room did not support multi-database queries and thus having a single database will save us time trying to combine data from multiple databases. In addition to this, a single database helps us avoid duplication of data and tests. The data module exposes itself to the repository layer via a datasource interface to prevent the repository from knowing the implementation details of the data layer thus observing the dependency rule. This will also enhance the flexibility of the application as we can easily switch from Room to SQLite or Realm if need be. This module consists of a mapper to convert entities to data classes that can be passed around.

Network Module

The network module provides support for making network requests to external APIs. This module basically consists of retrofit interfaces, response data classes and mappers to convert the response classes. The network module is exposed to the repository layer via a remote datasource.

Repository module

The repository module depends on the data module and the network module. The role of this module is to sync data from different sources and present it as a single source. Ideally, the repository module observes the repository pattern recommended by Google.

Features

The application contains three features i.e. schedule, feed & about and one dynamic feature i.e tickets. The features depend on the repository module and the core module. The dynamic feature depends on the app module.

App

The app module handles navigation between the features. It also consists of key UI activities or fragments. e.g. Login.

Base Core

Consists of classes and logic that is to be shared across the application. It contains utility classes and functions as well. The base core is a library.

Modules To Be There:

With the above in mind, here are the actual modules in the droidconKE2020 app following the guidelines laid above

1. app

2. core (library)

3. data (library)

4. features - directory for grouping all the feature modules together. It has the following dynamic feature modules:

   • about - has the details of the event, team members and their details that is when each team member card is clicked
   • auth - has the sign-up, sign-in, forgot password and reset password logic
   • feed - has a #droidconKE newsfeed
   • feedback - has session and event feedback logic
   • home - shows sponsors, promoted stuff, organizers and changes according to time ie before and during the event
   • sessions - shows each days sessions(day one, day two, day three) session details, and also has filter sessions logic and show a user's favorited sessions
   • speaker - shows speaker details

5. repository(library)

6. network(library)

Koin Integration & Guides

Dependency injection is integrated into the project based on the project's architecture. Each modules gradle file has koin dependencies.

Data module

The data module define a databaseModule in Module.kt file. The module defines a room database like:

`single {
    Room.databaseBuilder(
            androidApplication(),
            DroidConDB::class.java,
            "droidCon.db")
        .build()
}`

Then define entity in its on directory. Each entity defines a Data Access Object interfaces and data sources. For example, the user directory includes; user model file, UserDao interface and a LocalUserDataSource file. To define dependencies follow these steps;

Define a data access object like this;

`@Dao
interface UserDao {
    @Query("SELECT * FROM user")
    fun getUser(): User
}`

Then define a koin dependency like this:

`factory { get<DroidConDB>().userDao() }`

and a data source dependencies like this:

`factory { LocalUserDataSource(get()) }`

Network Module

The network module also defines individual entities which shall contain response and request bodies (DTOs), if they are necessary, api service interface and a data source.

To inject dependencies for data sources, do this:

`factory { get<Retrofit>().create(UserAPIService::class.java) }`

for api service interface dependency injection definition add this:

`factory { RemoteUserDataSource(get()) }`

to define data source dependencies.

Repository Module

The repository is dependent on the network and data module. To define a repository dependency, do this:

`factory { UserRepository(get(), get()) }`

The first parameter is the UserLocalDataSource from the data module and the second is the UserRemoteDataSource from the network module.

Features

Each feature depend on the repository module. ViewModel dependencies require repository dependencies. for viewmodel injection, follow this steps;

create a class, for example LoginViewModel,

`class AuthViewModel(private val repository: UserRepository): ViewModel() {
    fun login(username: String, password: String) {
        repository.login(username, password) }  
}`

Then in the features di directory, add a viewmodel injection like this:

`viewModel { AuthViewModel(get()) }`

then inject the viewmodel into a fragment/activity

`class AuthFragment: Fragment() {
    **val authFragment: AuthFragment by viewModel()**
    
    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return super.onCreateView(inflater, container, savedInstanceState)
    }    
}`

Gradle

The App uses Kotlin DSL for its gradle due to the obvious advantages Kotlin affords as compared to Groovy. The Dependencies.kt file under buildSrc is where we store all our App Dependencies and contains the following objects;

1. Versions; The versions object contains all the Application’s version code and version name as well as all the variable library version codes.
2. BuildPlugins; This object contains all the plugins required for the build process.
3. Libraries; This object contains all the required imported application libraries.
4. APIs This object contains all the required APIs
5. AndroidSDK This object contains the minSDK, targetSDK and compileSDK version codes
6. TestLibraries This object contains all the required Libraries for testing.
7. BuildModules This object is split into Libraries and Features. The Libraries contain the APP module and the other core Modules which are to be reused in different Dynamic features while the Features contain specific functionality of different aspects of the app.

To add a Dependency go to the Dependencies.kt file add it in the required object. Then go to the target build.gradle.kts file and add the code. E.g.; Implementation(ObjectName.Example)

Navigation

The app uses Single Activity Architecture. And follows Navigation Principles from Jetpack. And since features are all dynamic modules, we have taken advantage of the introduction of the support of dynamic features in the navigation component in the latest release. How this works is we use fragments in the feature modules and add the fragments to the main nav graph which has the support for adding destinations from dynamic feature modules. More on this is in the Navigate with dynamic feature modules tutorial. Note: Adding destinations might not work in AS version below 3.6 Release Candidate 3(RC3) and destination fragment name might be in red but no worries, app runs well as expected.

Dependencies

1. Jetpack - Jetpack Libraries to use
   • LiveData
   • AndroidX
   • Android KTX
   • Navigation
   • Room
   • ViewModel
   • Lifecycle
2. Coroutines - For Concurrency and Asynchronous tasks
3. Retrofit - For network requests
4. Koin - For Dependency Injection
5. Crashlytics
6. Coil - For Image Loading and Caching
7. Firebase Perf - For analyzing app perfomance
8. Testing Dependencies -
   • JUnit
   • AndroidX Test
   • Espresso
   • Mockk
   • Roboelectric
   • Kakao
9. Lint Checks - Consider adding a library for lint checks
   • Ktlint

Feature Modules:

Each module have its own domain, data and presentation or how do we approach this

Permissions

TBA

References/Resources

1. Android ShowCase
2. Kotlin Sample App
3. DroidKaigi Conference App 2020
4. Clean Architecture post on ProAndroid Dev
5. ReadME Master templates
6. contributors-img

Work in progress

🚧 ⛏ 🔧️ 🚧

- Ktlint [https://ktlint.github.io/]

On Feature Modules: Does each module have its own domain, data and presentation or how do we approach this

[ 🚧 Work in progress 👷‍♀️⛏👷🔧️ 🚧 ]

• [ ] Finalize on the final App architecture.
• [ ] Setup app modules
• [ ] Work on Modules Specifics
• [ ] Dependencies Setup - Gradle kts

You can improve on this and add further features:

• Your suggestion as an issue here

Contributing

We would love to have your help in making droidconKE 2020 App better. The project is still very incomplete, but if there's an issue you'd like to see addressed sooner rather than later, let us know.

Before you contribute though read the contributing guide here: CONTRIBUTING GUIDE

For any concerns kindly:

• Open an issue,

  or JUST,

• Fork the project and send a pull request.

Coding Convention

• For any view id, ie. Buttons, Edit Texts etc., we will use camelCase ie. btnLogin, etName.

• Classes name end with the name of the component e.g. MainActivity and MainViewModel

• For layout xml files the name of the component comes first i.e. fragment_login

• The parent layout container id is given a prefix layout_ e.g. layout_login

• Value files should always be in plural ie. strings/colors/styles etc.

• String values should be named as txt_login or err_failed and should not be in block and colors values should be in small ie. colorBlue

• Recycler view layouts should start with the prefix item eg. item_sessions

and xml attributes ie. background should be named as btn_login_bg.xml

• Menu items should be named as activity_main it is repetitive to add the term menu since they are contained in the menu directory

• Ideally, in the xml, the first attribute after the tag is id, then width, then height and then anything else android: followed by app and lastly tools:

License

Assets

Credits:

• Logo is used from droidconKE

• Follow them twitter: @droidconKE

Versions

Version 1.0 TBR (To Be Released)

Contributors

Auto-populated from: contributors-img

✌️ 🍹

References/Resources

1. https://github.com/igorwojda/android-showcase
2. https://github.com/VMadalin/kotlin-sample-app
3. https://github.com/DroidKaigi/conference-app-2020
4. https://proandroiddev.com/multiple-ways-of-defining-clean-architecture-layers-bbb70afa5d4a