本文详细解读了GridLayout组件如何组织子视图成矩形网格，介绍了网格线的索引体系，并着重说明了起始和结束网格索引的固定位置。无论GridLayout配置如何，理解这些概念有助于更高效地使用该布局方式。
GridLayout
A layout that places its children in a rectangular grid.
The grid is composed of a set of infinitely thin lines that separate the viewing area into cells. Throughout the API, grid lines are referenced by grid indices. A grid with N columns has N + 1 grid indices that run from 0 through N inclusive. Regardless of how GridLayout is configured, grid index 0 is fixed to the leading edge of the container and grid index N is fixed to its trailing edge (after padding is taken into account).
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