Android Data Binding Support Library
•
2 likes•804 views
Data binding is a declarative way to bind UI components to application data sources. It minimizes code needed to bind layouts to data and supports MVVM pattern. Data binding engine allows binding layouts to observable data sources and updating UI automatically when data changes. It works on Android 2.1+ and uses XML syntax like <layout> and @{} to bind variables and call methods.
Report
Share
Android Data Binding Support Library
- 2. Data Binding Engine - Declarative layouts(implicit data/command binding) - Minimize app logic-to-layout binding code - Model View ViewModel (MVVM) 2
- 3. Model View ViewModel - used in Microsoft frameworks with XAML as binding language - Variant of MVC pattern - M : domain model - V : view - VM : mediator, binds view, reacts to events 3
- 4. 4
- 5. 5
- 6. Specs & Syntax - Support Lib Android 2.1(API 7+) - Beta Release : Android Studio 1.3.0-beta1+ - <layout> <data> <variable> <import> - “@{ }” “@{user.firstName}” 6
- 7. Allowed / Disallowed Syntax - math, string concat - logical, binary, unary, ternary, shift - instanceof, cast, method call - grouping, field and array access - literals, comparisons - this - super - new - explicit generic invocation 7
- 8. Layout and Variable Bind Example 8
- 9. Import and Static Method Call Example 9
- 10. Data Object - POJO/Beans modification doesn’t update UI - <variable> types inspected on compile, must implement Observable via BaseObservable and @Bindable - Observable, Observable Field, Observable Collection : are notified on data change 10
- 11. Data Object and Observable Examples 11
- 12. Why? - fragments traditionally create, bind, configure views, and hold the domain logic; can be limited to binding - UIs react to changes in the ViewModel, asynchronous updates on the UI thread and from background threads ∴ responsive UI - 12
- 13. Why Continued - HTTP/2 Request and Response Multiplexing - Increase in local and remote inter-process communication as apps get more complex, and as they get more connected(IoT, Bluetooth, Wifi) 13