ViewGroup.layout(int l, int t, int r, int b)四个输入参数的含意

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于 2014-07-06 10:28:05 发布

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分类专栏： android 文章标签：博客 android

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本文详细介绍了Android中View的layout方法，该方法用于确定View及其子View的大小和位置。这是布局机制的第二阶段，在这一阶段，每个父View都会调用其所有子View的layout方法来定位它们。通常使用在测量阶段存储的子View尺寸来进行此操作。

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void android.view. View.layout(int l, int t, int r, int b)

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().

Derived classes should not override this method. Derived classes with children should override onLayout. In that method, they should call layout on each of their children.

Parameters:

l Left position, relative to parent

t Top position, relative to parent

r Right position, relative to parent

b Bottom position, relative to parent

           /**
           * l Left position, relative to parent    控件左边距离左边的距离
               t Top position, relative to parent            控件上边距离上边的距离
               r Right position, relative to parent   控件右边距离左边的距离
               b Bottom position, relative to parent 控件下面距离上边的距离
           */