Used to set the number of sibling elements in the relative-layout. -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.

<number>int only. the number of the current element. Default value is -1.
-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 | -1 |
| Applies to | relative items |
| Inherited | no |
| Animatable |
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