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Android @ Scale
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rallat
April 13, 2018
Technology
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Android @ Scale
5 minute talk at Shibuya APK
rallat
April 13, 2018
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Transcript
Android @ Scale
Israel Ferrer Camacho @rallat
MV
MV WW
WW = “whatever works”
Define Principles
Apply Principles
with Consistency Apply Principles
Principles must evolve
Principles?
Dependency Injection
Dependency Injection
Dependency Injection Allows to declare dependencies of an object upfront.
Dependency Injection Allows to declare dependencies of an object upfront.
This helps to easily mock dependencies and unit test the object
Single Responsibility
None
View layer
UI Manipulation
UI Manipulation
Logic layer UI Manipulation
Screen Behavior UI Manipulation
Screen Behavior UI Manipulation
Screen Behavior UI Manipulation Data layer
Screen Behavior UI Manipulation Repository Interface Network DB Memory cache
Complex screens
Complex screens Multiple logic layer components each with a single
responsibility.
Complex screens Multiple logic layer components each with a single
responsibility. Logic layer components can subscribe to events tied to their logic (E.g. Rx, EventBus)
Shared logic
Shared logic If the view is shared you can create
a 3 layered complete feature component.
Shared logic If the view is shared you can create
a 3 layered complete feature component. If the view is not share then add another layer…
Data layer View layer Logic layer
Use cases Screen behavior View layer Data layer
Screen behavior View layer Data layer
Screen behavior View layer Data layer Sort Items
Screen behavior View layer Data layer Sort Items Buy Item
Screen behavior View layer Data layer Sort Items Buy Item
Like Item
Screen behavior View layer Data layer Sort Items Buy Item
Like Item Comment Item
Goal
Goal Each layer has a reason to exist.
Goal Each layer has a reason to exist. Consistency in
codebase
Goal Each layer has a reason to exist. Consistency in
codebase Testable logic layer
Goal Each layer has a reason to exist. Consistency in
codebase Testable logic layer Reusable of logic layer
Do Not Over-Engineer
Do Not Over-Engineer Libraries, patterns are tools not goals
Do Not Over-Engineer Libraries, patterns are tools not goals The
goal is to ship and maintain speed of development
Questions? @rallat