简单来说，就是xml的id不允许相同，而使用代码分配的id允许相同。在查找时会使用深度优先探索，分配的id是有优先级的 资料来自：https://stackoverflow.com/questions/8460680/how-can-i-assign-an-id-to-a-view-programmatically Android id overview An Android id is an integer commonly used to identify views; this id can be assigned via XML (when possible) and via code (programmatically.) The id is most useful for getting references for XML-d…