例如，我想将 RecyclerView 的高度设置为占据整个屏幕余下的空间。
代码结构
// 外层，例如 LinearLayout
android:layout_height="match_parent"
// 组件，例如 RecyclerView
android:layout_weight="1"
android:layout_height="0dp"
如果不设置 layout_height
会遇到运行时错误：
you must supply a layout_height attribute
如果设置 layout_height 为 wrap_content
若同时设置 layout_weight 和 layout_height，且 layout_height 为 wrap_content.
会看到警告信息：
Issue id: InefficientWeight
Use a layout_height of 0dp instead of wrap_content for better performance When only a single widget in a LinearLayout defines a weight, it is more efficient to assign a width/height of 0dp to it since it will absorb all the remaining space anyway. With a declared width/height of 0dp it does not have to measure its own size first.