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pathRelative - behaves similarly to previous attributes but changes the coordinates system.

parentRelative - is similar to deltaRelative but the values will be relative to the parent size.

For example, if during the animation a view moves down 100 pixels and motionPercentX is equal to -50% then it means that in the initial stage of the animation your view will move up 50 pixels and then it will move down 150 pixels to its final destination.

‍ deltaRelative - means that the values you provided will be relative to the view's animation distance on a given axis.

motion:keyPositionType - determines how exactly motion:motionPercentX and motion:percentY will affect view’s position.

For example value 50 would mean that position will be reached in the middle of the animation.

motion:framePosition determines when the position should be reached.

motion:percentX, motion:percentY - specify view position.

Possible values are “spline” and “linear.”

motion:curveFit - describes the interpolation curve.

Possible values are “accelerate” | “decelerate” | “linear.”

motion:transitionEasing - determines what kind of easing curve will be used.

motion:motionTarget - defines view whose position is changed.

KeyPosition specifies view position during the motion sequence. We will now describe the most important keyframes in detail.

It gives more control over the animation’s motion. The last piece of the MotionLayout puzzle is the key frameset. The second way is to use the pathMotionArc parameter.Īs you can see we’ve added motion:pathMotionArc="startVertical" to the starting constraint. Material design guidelines often recommend using arc motion in animations as it’s more natural. can be also used for already defined view properties like backgroundColor. To create a custom attribute, you need to define a variable with public getter and setter in a custom view and then pass its name as motion:attributeName. Circle radius will be changing its value from 0 to 1 while the animation progresses. This scene is very similar to the last one. HandleView is the only view in our MotionLayout. Our layout will be very basic once again. We will modify this variable to animate circle size. This custom view paints a blue circle with a radius dependent on the radius variable. All transitions and animations might be described purely in xml.īefore we start playing with MotionLayout, we need to add suitable dependencies to a project. The amazing thing about MotionLayout is that it’s fully declarative.

The difference is that MotionLayout builds upon its capabilities - we can now describe layout transitions and animate view properties changes. We can define and constraint children just like we would do when using standard ConstraintLayout. So, what’s the MotionLayout? Simply put, MotionLayout is a Viewgroup that extends ConstraintLayout.