Data Binding for Fun and Profit
@colinmlee
Who Are You?
Colin Lee
Android Software Engineer
@ Vidku
Twitter: @colinmlee
Vidku: @colin
Slides!
https://slides.com/colinlee/deck
All examples are at http://github.com/colintheshots
Android Dev Summit Talk
https://www.youtube.com/watch?v=NBbeQMOcnZ0
What is Data Binding?
Data binding provides a more expressive means of binding models to views using XML and generated code.
Advantages
- Removes View code from Activities & Fragments
- In the support library back to API 7
- Excellent performance
- XML layouts become single source of truth
- Provides some null safety
- Enables MVVM pattern
- Eliminate boilerplate
Disadvantages
- IDE support is not all there yet
- Known bugs exist
- Still in beta
Performance
- Generated code, not reflection
- Fewer traversals than separate findViewById() calls
- Expressions cached between views
- View changes are batched
Slide Credit: Jacob Tabak
Early Competitors
- Kotlin Plugin
- Holdr
- Android Annotations
- RoboGuice
- Butterknife
Cool Places to Use
- RecyclerViews
- Fonts
- View Listeners
- ImageViews
- Animations
Observable Fields
Updating a POJO does not update the view.
Use ObservableFields to
track updated values.
MVVM
Model
View
ViewModel
Model
Contains your raw data.
View
Provides formatted output to the user.
ViewModel
Formats your data for the view to output.
Code Example
Questions?
Please take a moment to fill out
the class feedback form via the
app.