Android 的 Relative Layout 常量

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android:layout_above 將該控制項的底部置於給定ID的控制項之上                    --Rule that aligns a child‘s bottom edge with another child‘s top edge.
android:layout_below 將該控制項的頂部置於給定ID的控制項之下                    --Rule that aligns a child‘s top edge with another child‘s bottom edge.
android:layout_toLeftOf 將該控制項的右邊緣和給定ID的控制項的左邊緣對齊            --Rule that aligns a child‘s right edge with another child‘s left edge.
android:layout_toRightOf 將該控制項的左邊緣和給定ID的控制項的右邊緣對齊            --Rule that aligns a child‘s left edge with another child‘s right edge.

android:layout_alignBaseline 該控制項的baseline和給定ID的控制項的baseline對齊        --Rule that aligns a child‘s baseline with another child‘s baseline.
android:layout_alignBottom 將該控制項的底部邊緣與給定ID控制項的底部邊緣            --Rule that aligns a child‘s bottom edge with another child‘s bottom edge.
android:layout_alignLeft 將該控制項的左邊緣與給定ID控制項的左邊緣對齊            --Rule that aligns a child‘s left edge with another child‘s left edge.
android:layout_alignRight 將該控制項的右邊緣與給定ID控制項的右邊緣對齊            --Rule that aligns a child‘s right edge with another child‘s right edge.
android:layout_alignTop 將給定控制項的頂部邊緣與給定ID控制項的頂部對齊            --Rule that aligns a child‘s top edge with another child‘s top edge.


android:alignParentBottom 如果該值為true，則將該控制項的底部和父控制項的底部對齊        --Rule that aligns the child‘s bottom edge with its RelativeLayout parent‘s bottom edge.
android:layout_alignParentLeft 如果該值為true，則將該控制項的左邊與父控制項的左邊對齊    --Rule that aligns the child‘s left edge with its RelativeLayout parent‘s left edge.
android:layout_alignParentRight 如果該值為true，則將該控制項的右邊與父控制項的右邊對齊    --Rule that aligns the child‘s right edge with its RelativeLayout parent‘s right edge.
android:layout_alignParentTop 如果該值為true，則將空間的頂部與父控制項的頂部對齊        --Rule that aligns the child‘s top edge with its RelativeLayout parent‘s top edge.

android:layout_centerHorizontal 如果值為true，該控制項將被置於水平方向的中央        --Rule that centers the child horizontally with respect to the bounds of its RelativeLayout parent.
android:layout_centerInParent 如果值為true，該控制項將被置於父控制項水平方向和垂直方向的中央--Rule that centers the child with respect to the bounds of its RelativeLayout parent.
android:layout_centerVertical 如果值為true，該控制項將被置於垂直方向的中央        --Rule that centers the child vertically with respect to the bounds of its RelativeLayout parent.

Android 的 Relative Layout 常量