Material design introduces depth for UI elements. Depth helps users understand the relative -importance of each element and focus their attention to the task at hand.
+Material design introduces elevation for UI elements. Elevation helps users understand the +relative importance of each element and focus their attention to the task at hand.
-The elevation of a view, represented by the Z property, determines the size of its shadow: -views with higher Z values cast bigger shadows. Views only cast shadows on the Z=0 plane; they -don't cast shadows on other views placed below them and above the Z=0 plane.
+The elevation of a view, represented by the Z property, determines the visual appearance of its +shadow: views with higher Z values cast larger, softer shadows. Views with higher Z values occlude +views with lower Z values; however, the Z value of a view does not affect the view's size.
-Views with higher Z values occlude views with lower Z values. However, the Z value of a view -does not affect the view's size.
+Shadows are drawn by the parent of the elevated view, and thus subject to standard view clipping, +clipped by the parent by default.
Elevation is also useful to create animations where widgets temporarily rise above the view plane when performing some action.
+For more information about elevation in material design, see +Objects +in 3D space.
+The Z value for a view has two components, elevation and translation. The elevation is the -static component, and the translation is used for animations:
+The Z value for a view has two components: + +
Z = elevation + translationZ
+
Figure 1 - Shadows for different view elevations.
To set the elevation of a view in a layout definition, use the android:elevation
@@ -59,9 +67,9 @@ guide.
You can also use a {@link android.animation.StateListAnimator} to specify these animations in a declarative way. This is especially useful for cases where state changes trigger animations, like when a user presses a button. For more information, see -Animate View State Changes
. +Animate View State Changes. -The Z values are measured in the same units as the X and Y values.
+The Z values are measured in dp (density-independent pixels).