ConstraintLayout 2.0.0

We are very happy to announce the stable release of ConstraintLayout 2.0 -- a long journey, but this version adds a very long list of capabilities to v1!

From better runtime API to build up layouts, to the introduction of new layout mechanisms such as Flow, or additional helpers like Layer, the new features will help you build powerful and adaptable layouts. Most notably of course, this release introduces MotionLayout, an extremely powerful subclass of ConstraintLayout that you can use to create refined motion in your application.

In addition to the existing Layout Editor in Android Studio, allowing easy creation and edition of UI with ConstraintLayout, we recently added a new Motion Editor in Android Studio 4.0+, enabling you to quickly take advantage of MotionLayout in your projects.

It’s available from the google maven repository:

dependencies {
    implementation 'androidx.constraintlayout:constraintlayout:2.0.0'
}

or if using the android.support packages:

dependencies {
    implementation 'com.android.support.constraint:constraint-layout:2.0.0'
}

Documentation is available on https://developer.android.com/reference/androidx/constraintlayout/widget/ConstraintLayout and https://developer.android.com/reference/androidx/constraintlayout/motion/widget/MotionLayout

Examples are available on https://github.com/android/views-widgets-samples/tree/master/ConstraintLayoutExamples

Note

We are aware of a compatibility issue with Motion Editor in Studio 4.0, a fix will be released shortly. 

Bugfixes

Here is the list of issues fixed since the rc1. Notable fixes are:

• MotionLayout Transition delays & TransitionListener fixes
• ConstraintLayout flow & barrier fixes

MotionLayout inside ScrollView does not properly adjust height after transition	140447122
A view has 0 width instead of full width when surrounded and constrained with other three gone views	162917672
ConstraintLayout : View that has both top and bottom constraints is positioned wrong	163880200
ConstraintLayout : incorrect positioning when applying a bias of 1.0	165028374
Setting the visibility of a View to GONE causes layout to render incorrectly in 2.0.0-rc1	164130218
[Flow] android:layout_width == 0dp works wrong	164794521
TransitionListener.onTransitionChange is called over and over again when use MotionLayout in RelativeLayout	152542382
Incorrect positioning of Barriers in 2.0.0-beta5	159540431
TOP barrier broken in beta8	163100583
Long duration fadeIn animation	163848906
Negative padding causes issues with 2.0.0-rc1	164160877