Introduction to android studio 2.0 and data binding library

1. Introduction to android studio 2.0
and Data Binding Library
Kaushal Dhruw
@drulabs

2. Data binding library (Beta)
• Write apps faster.
• Minimize glue code for UI.
• No more findViewById(R.id…)
• Bind data and UI with minimum lines of code.
• Move basic UI logic from java class to xml layout file.
• Bind data (custom variables) and events. Define custom attributes.
• Supported all the way back to Android 2.1
• Available on android studio 1.3+ (Gradle plugin 1.5+ required)

3. Setting up studio for DBL
• Prerequisites - Android studio 1.3 +, Gradle plugin 1.5.0-alpha1 +
• Project gradle file: • Module gradle file
• And done...

4. Writing Data Bind layouts
Change the root element of layout… To this
Old_sample_layout.xml
Dbl_layout.xml

5. Writing Data Bind layouts…
• What happens when an xml layout is defined with layout root tag?
• A binding file is generated. For prev example it will be DblLayoutBinding.java
• This contains references to all the child views (as public final fields).
• This binding file can now be used to populate data
• What is that <data> tag?
• In data tag we tell the layout processor that a java class will be used to populate data.
• We can import custom or android classes inside data element.
• Multiple variable declaration and imports are possible inside data tag.
• Custom attributes and more in Demo…

6. Without DBL… With DBL

7. Some Data binding expressions
android:visibility="@{vItem.even ? View.VISIBLE : View.INVISIBLE}"
android:text=@{vItem.shortName.substring(0,7)};
android:text="@{user.displayName ?? user.lastName}"
android:text="@{@string/nameFormat(firstName, lastName)}"
android:text="@{@plurals/banana(bananaCount)}“
app:ImageURL="@{vItem.imageUrl}“
app:loadingImage="@drawable/img_loading“
Binding Custom attributes
@BindingAdapter("bind:imageURL") /*can add more attributes here*/
public static void loadImage(ImageView img, String url) {
Picasso.with(img.getContext()).load(url).into(img);
}

8. Android studio 2.0 Preview 6
(released on Jan 20, 2016)

9. What is android studio???
• Google’s IDE for android development.
• Built in support for Google cloud platform.
• Flexible Gradle-based build system.
• Built on top of latest IntelliJ IDEA platform.
• Multi screen app development.
• Latest version 1.5.1.
• Available on android developer site. http://developer.android.com/sdk/index.html

10. Some changes since studio 1.0 (DEC 2014)
• New Memory / GPU / CPU monitor
• Vector asset studio.
• Theme editor
• Integrated SDK manager.
• Data binding support and HAXM optimizations
• Enable AdMob and Analytics from within android studio.
• Live templates for quick code insertion.
• And many more…

11. • Available in stable build channel.
• http://tools.android.com/download/studio/builds/2-0-preview.
• Not recommended (still in preview stage).
• Canary channel (Preview 6 available on Jan-20,2016).
• http://tools.android.com/download/studio/canary/latest
• Download a separate build.
How to get the 2.0 preview?

12. • IDE Enhancements
• Build System
• Android Emulators
What’s new in studio 2.0 (preview)

13. • IntelliJ 15 support (15.0.2).
• New GPU profiler (experimental preview).
• Google search deep linking support in built.
• Instant Run (Continued…)
• Lot of UI improvements.
IDE Enhancements

14. • Improved dx merger (Build tools 23.0.2+, Gradle 2.0).
• Pre-dexing dependencies. Gradle build 2-2.5 times faster.
• New experimental shrinker for debug mode.
• Shrinking only. No Obfuscation No Optimization.
• Overall build – deploy – install cycle is ~1.5 times faster.
• New protocol for ADB push / pull.
• Huge speed improvement.
• Instant Run (Gradle 2.0-alpha5+, gradlew 2.10).
• Hot swap, cold swap, freeze swap
Build System

15. • Completely new UI with extended controls.
• Control almost every feature of emulated device
• Drag and drop APKs and files.
• Send SMS, receive calls.
• System keyboard support & Resizing.
• Finger printing support.
• Select number of cores (experimental and based on number of cores in system)
• And more in demo.
Emulator 2.0 (requires SDK tools 25.0+)

16. How long would it take
to develop this?
Divide that time by 2 with
DBL
Even lesser with instant run