146: 3 Things Every Android Developer Needs to Know · Fragmented

In this episode of Fragmented, Donn digs into three things that every Android developer needs to know.

Dependency Injection
```
1. Constructor\_setter\_method injection
2. Service Locators or other DI frameworks
3. Common Frameworks
    1. [Dagger](https://google.github.io/dagger/android.html)
    2. [Koin](https://github.com/InsertKoinIO/koin)
    3. [Kodein](https://github.com/Kodein-Framework/Kodein-DI)
    4. [ToothPick](https://github.com/stephanenicolas/toothpick)
```
- How to test
  1. Functional / System
  2. Integration
  3. Unit
  4. Tools:
    1. jUnit
    2. Espresso
    3. Spek
- Keep it simple simple
  1. KISS principle KISS principle – Wikipedia
  2. Examples
    1. Code Duplication
      1. “Extract this into a method”
    2. Lets create a framework for this
    3. Kaushik’s – 3x rule
      - if something is duplicated 3 or more times, think about extracting it
    4. 3/6 Rule – In 6 months, will I be able to understand this in under 3 minutes?

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