What is orientation constants for views?

Question

<View
    android:layout_width="match_parent"
    android:layout_height="12dp"
    android:orientation="horizontal" />

What is android:orientation="horizontal" in the above xml?

The Android-Studio quick tip shows it is orientation constant, which is not very helpful.

Answer 1

there is no use for orientation attribute in View, orientation is only required for Linear layout or other parent layouts

Answer 2

android:orientation is only relevant in a ViewGroup where its children are organized consecutively such as a LinearLayout, so in your case it's absolutely useless.