Presentation from TOAST - Android Developers Meet-up #10. 6th April 2017, Wrocław

1. Constraint Layout - A New Hope
Grzegorz Matyszczak
grzegorz.matyszczak@droidsonroids.pl

2. AGENDA

3. ●What is it all about?
●How to start
●Constraint Layout’s features
●Should we use it?

4. What is it all about?

5. <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello!"/>
<!-- etc... -->
Nested layouts
A lot of measure cycles!

6. The new Layout Editor

8. Constraint Layout!
● Announced at Google I/O 2016
● Relative Layout on roids
● Flexible
● Helps keeping flat layout hierarchy
● Tied with the new Layout Editor
● Unbundled library

9. How to start

10. ● Android Studio 2.3
● Min. API 9
● Gradle dependency:
Requirements
compile 'com.android.support.constraint:constraint-layout:1.0.2'

11. Cool features

13. Link to the example
https://github.com/gmatyszczak/constraint-layout-demo

14. ● Horizontal / vertical bias
● Guidelines
● Chains
● Aspect ratio
● Constraint set
Features we which used

15. Should we use it?

16. Go for it!

17. Documentation:
https://developer.android.com/training/constraint-layout/index.html
https://developer.android.com/reference/android/support/constraint/ConstraintLayo
ut.html
Talk by Nicolas Roard:
https://realm.io/news/constraintlayout-it-can-do-what-now/
My post about Constraint Layout:
https://www.thedroidsonroids.com/blog/android/constraint-layout-relative-layout-
on-roids/
Links

18. Thanks for attention!
grzegorz.matyszczak@droidsonroids.pl