The current element is to the top of the sibling element specified corresponding to id in relative-layout.

noneDefault Value. Act as not set this property.
<number>int only. Specifies the sibling element number.(refer to relative-id).
Attention please when setting relative-id: -1 and 0 are special values. -1 is the default value, indicating that the current element will not be considered as the alignment reference standard for sibling elements. Using 0 as an element ID is not allowed, as it will result in unexpected behavior.
| Initial value | none |
| Applies to | relative items |
| Inherited | no |
| Animatable |
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