真坑人Android2.2中添加的match_parent和fill_parent没有区别,又是为了兼容  

标题里已经把这个意思表达清楚了,两个参数意思一样,只是某大仙觉得match_parent更贴切,于是从2.2开始你两个词都可以用。那么如果考虑低版本的使用情况你就需要用fill_parent了。

下面是两者相同的证据,看android.view.ViewGroup里的静态嵌套类LayoutParams中的代码:

public static final int FILL_PARENT = -1; 
   /**
    * Special value for the height or width requested by a View.
    * MATCH_PARENT means that the view wants to be as big as its parent,
    * minus the parent’s padding, if any. Introduced in API Level 9.
    */ 
   public static final int MATCH_PARENT = -1; 
   /**
    * Special value for the height or width requested by a View.
    * WRAP_CONTENT means that the view wants to be just large enough to fit
    * its own internal content, taking its own padding into account.
    */ 

match_parent到底是什么类型呢?

其实从Android 2.2开始FILL_PARENT改名为MATCH_PARENT ,从API Level为8开始我们可以直接用MATCH_PARENT来代替FILL_PARENT,最后Android123提醒大家,他们的定义本质是一样均为 -1,只是换了个别名,可能为了更准确些,

比如最终在SDK中的定义为:

fill_parent -1 The view should be as big as its parent (minus padding). This constant is deprecated starting from API Level 8 and is replaced by match_parent.

match_parent -1 The view should be as big as its parent (minus padding). Introduced in API Level 8.
wrap_content -2 The view should be only big enough to enclose its content (plus padding).

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