What is android:layout_gravity="clip_vertical" exactly -

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the property android:layout_gravity="clip_vertical|horizontal" following mentioned in sdk documentation:

additional option can set have top and/or bottom edges of child clipped container's bounds. clip based on vertical gravity: top gravity clip bottom edge, bottom gravity clip top edge, , neither clip both edges.

but can't see of in applications

so purpose of property ?

thanks

short version:

clip_horizontal , clip_vertical apply measurements of view itself, before contents (such image in bitmapdrawable) rendered.

long version:

i've run similar confusion on clip_horizontal , clip_vertical. (in case, related android:gravity bitmapdrawable, it's similar enough applicable.)

from documentation thought android:gravity="top|left|clip_vertical" on bitmap cause image's top left corner positioned @ view's top left corner, , that, if bitmap taller view, "clipped" @ bottom edge of view. in other words, show of bitmap view tall enough reveal; not stretch bitmap, instead show whatever fit, letting rest extend below bottom edge.

however, opposite happened: when set clip_vertical, large bitmap squished vertically fit within height of view.

after examining applydisplay() method in platform/frameworks/core/java/android/view/gravity.java, realized mistake:

it isn't bitmap image going clipped, view -- actual size of container image rendered into.

setting clip_vertical in case didn't mean "clip image @ bottom edge," meant "clip bitmapdrawable's view height matches height of parent container"...which caused image "squished" filled shorter height.

so, important thing remember android:gravity , android:layout_gravity clip_horizontal , clip_vertical apply measurements of view itself, before contents (such bitmapdrawable) rendered.


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