Все, что вам нужно, это View.layout(int,int,int,int)
метод.
Ссылка говорит:
public void layout (int l, int t, int r, int b)
Since: API Level 1
Assign a size and position to a view and all of its descendants
This is the second phase of the layout mechanism. (The first is measuring).
In this phase, each parent calls layout on all of its children to position them.
This is typically done using the child measurements that were stored
in the measure pass().