继承自：Object
自身类型： 公共静态类 public static class
子类：(各种布局).LayoutParams
概述：
Class Overview
LayoutParams are used by views to tell their parents how they want to be laid out. See ViewGroup Layout Attributes for a list of all child view attributes that this class supports.
The base LayoutParams class just describes how big the view wants to be for both width and height. For each dimension, it can specify one of:
- FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which means that the view wants to be as big as its parent (minus padding)
- WRAP_CONTENT, which means that the view wants to be just big enough to enclose its content (plus padding)
- an exact number
There are subclasses of LayoutParams for different subclasses of ViewGroup. For example, AbsoluteLayout has its own subclass
LayoutParams布局参数，被view使用来告诉他们的父vew group，他们想怎么被放置。请见ViewGroup Layout Attributes获得这个类所支持的所有子view属性。
这个基类LayoutParams仅仅描述了一个view想要多大，就宽和高两方面来说。对于每个大小（宽和高），它可以指定为下述中的一个：
1.FILL_PARENT (在API 8 或者更高的版本中，被重命名为 MATCH_PARENT)，它意味着这个view想要和它的父view group（除去内边距）一样大
2.WRAP_CONTENT ，它意味着这个view想要仅仅大到能够包含它的内容（包括内边距）就行
3.一个确切的数字