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Get method documentation [Android Documentation]
Returns the desired weights sum.
Set method documentation [Android Documentation]
Defines the desired weights sum. If unspecified the weights sum is computed
at layout time by adding the layout_weight of each child.
This can be used for instance to give a single child 50% of the total
available space by giving it a layout_weight of 0.5 and setting the
weightSum to 1.0.