android RelativeLayout 适用场景和属性

RelativeLayout 适用于组件较多，并且组件之间位置关系复杂，需要组件之间通过彼此的位置互相约束来确定位置。

通过RelativeLayout 确定的组件之间的位置，不会因为RelativeLayout 位置的变化而改变。

一、参考网址

http://developer.android.com/reference/android/widget/RelativeLayout.html

http://developer.android.com/reference/android/widget/RelativeLayout.LayoutParams.html

二、基本属性

1、需要使用其他组件ID确定位置的属性。

XML Attributes
Attribute Name	Related Method	Description
android:layout_above		Positions the bottom edge of this view above the given anchor view ID.
android:layout_alignBaseline		Positions the baseline of this view on the baseline of the given anchor view ID.
android:layout_alignBottom		Makes the bottom edge of this view match the bottom edge of the given anchor view ID.
android:layout_alignEnd		Makes the end edge of this view match the end edge of the given anchor view ID.
android:layout_alignLeft		Makes the left edge of this view match the left edge of the given anchor view ID.
android:layout_below		Positions the top edge of this view below the given anchor view ID.
android:layout_alignRight		Makes the right edge of this view match the right edge of the given anchor view ID.
android:layout_alignStart		Makes the start edge of this view match the start edge of the given anchor view ID.
android:layout_alignTop		Makes the top edge of this view match the top edge of the given anchor view ID.
android:layout_toLeftOf		Positions the right edge of this view to the left of the given anchor view ID.
android:layout_toRightOf		Positions the left edge of this view to the right of the given anchor view ID.
android:layout_toStartOf		Positions the end edge of this view to the start of the given anchor view ID.
android:layout_toEndOf		Positions the start edge of this view to the end of the given anchor view ID.

2、需要使用true或者false的属性

XML Attributes
Attribute Name	Related Method	Description
android:layout_centerHorizontal		If true, centers this child horizontally within its parent.
android:layout_alignParentBottom		If true, makes the bottom edge of this view match the bottom edge of the parent.
android:layout_alignParentEnd		If true, makes the end edge of this view match the end edge of the parent.
android:layout_alignParentLeft		If true, makes the left edge of this view match the left edge of the parent.
android:layout_alignParentRight		If true, makes the right edge of this view match the right edge of the parent.
android:layout_alignParentStart		If true, makes the start edge of this view match the start edge of the parent.
android:layout_alignParentTop		If true, makes the top edge of this view match the top edge of the parent.
android:layout_centerInParent		If true, centers this child horizontally and vertically within its parent.
android:layout_alignWithParentIfMissing		If set to true, the parent will be used as the anchor when the anchor cannot be be found for layout_toLeftOf, layout_toRightOf, etc.
android:layout_centerVertical		If true, centers this child vertically within its parent.

3、需要设置size的属性

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