Clean Android Code articles series:

1. Clean Android Code: Main
2. Clean Android Code: Building with Gradle
3. Clean Android Code: Preparation
4. Clean Android Code: Activities & Fragments
5. Clean Android Code: Network & Data
6. Clean Android Code: Navigation & UI
7. Clean Android Code: Event Bus
8. Clean Android Code: Error Handling
9. Clean Android Code: ViewPager with View Pages
10. Clean Android Code: Clean Adapter
11. Clean Android Code: …

Basic idea of EventBus

In attempt to separate origin and handling of event, EventBus pattern have emerged in Android development community a few years ago. …

Clean Android Code articles series:

1. Clean Android Code: Main
2. Clean Android Code: Building with Gradle
3. Clean Android Code: Preparation
4. Clean Android Code: Activities & Fragments
5. Clean Android Code: Network & Data
6. Clean Android Code: Navigation & UI
7. Clean Android Code: Event Bus
8. Clean Android Code: Error Handling
9. Clean Android Code: ViewPager with View Pages
10. Clean Android Code: Clean Adapter
11. Clean Android Code: …

We already have one example of UI in the project: MainActivity that has a NavigationView on it, let’s add some more.

Main part of the display will be made by a Fragment, that will have MapView on it. That fragment will be displayed by MainActivity — it’s presenter will receive a showInitialScreen event from NavigationDrawerViewExtension. …

Clean Android Code articles series:

1. Clean Android Code: Main
2. Clean Android Code: Building with Gradle
3. Clean Android Code: Preparation
4. Clean Android Code: Activities & Fragments
5. Clean Android Code: Network & Data
6. Clean Android Code: Navigation & UI
7. Clean Android Code: Event Bus
8. Clean Android Code: Error Handling
9. Clean Android Code: ViewPager with View Pages
10. Clean Android Code: Clean Adapter
11. Clean Android Code: …

To better showcase approaches to architecture, let’s write some more code and make our sample an actual app.

Flickr on a map

As an example, let’s make an app that shows Google Maps, fetches information from Flickr and shows pins for pictures. …

Clean Android Code articles series:

1. Clean Android Code: Main
2. Clean Android Code: Building with Gradle
3. Clean Android Code: Preparation
4. Clean Android Code: Activities & Fragments
5. Clean Android Code: Network & Data
6. Clean Android Code: Navigation & UI
7. Clean Android Code: Event Bus
8. Clean Android Code: Error Handling
9. Clean Android Code: ViewPager with View Pages
10. Clean Android Code: Clean Adapter
11. Clean Android Code: …

Activities and Fragments are the most critical parts of Android application. Both represent an application screen that user will see. …

Clean Android Code articles series:

1. Clean Android Code: Main
2. Clean Android Code: Building with Gradle
3. Clean Android Code: Preparation
4. Clean Android Code: Activities & Fragments
5. Clean Android Code: Network & Data
6. Clean Android Code: Navigation & UI
7. Clean Android Code: Event Bus
8. Clean Android Code: Error Handling
9. Clean Android Code: ViewPager with View Pages
10. Clean Android Code: Clean Adapter
11. Clean Android Code: …

Before we start writing our first screen of the app, there are a few things we can setup beforehand. We can setup Dagger, agree on structure and prepare for testing.

Dagger 2

First let’s setup ApplicationContext and initialize dependency injection with Dagger 2. …

Clean Android Code articles series:

1. Clean Android Code: Main
2. Clean Android Code: Building with Gradle
3. Clean Android Code: Preparation
4. Clean Android Code: Activities & Fragments
5. Clean Android Code: Network & Data
6. Clean Android Code: Navigation & UI
7. Clean Android Code: Event Bus
8. Clean Android Code: Error Handling
9. Clean Android Code: ViewPager with View Pages
10. Clean Android Code: Clean Adapter
11. Clean Android Code: …

Gradle is a build system that was introduced to Android a couple years ago. If you are still not using it — you should. The only downside I see is that Groovy is used to write scripts, but, luckily, there is already an initiative to bring Kotlin to Gradle. …

This series of articles will focus on practical approaches on how to write testable, re-usable and maintainable code when developing applications for Android.

Clean Android Code articles series:

1. Clean Android Code: Main
2. Clean Android Code: Building with Gradle
3. Clean Android Code: Preparation
4. Clean Android Code: Activities & Fragments
5. Clean Android Code: Network & Data
6. Clean Android Code: Navigation & UI
7. Clean Android Code: Event Bus
8. Clean Android Code: Error Handling
9. Clean Android Code: ViewPager with View Pages
10. Clean Android Code: Clean Adapter
11. Clean Android Code: …

In the first article I will be talking about why do we need to do it, will provide a list of libraries that I strongly recommend to use in your apps and will present a basic architecture of how things could be done, with not much specifics. …