[Common attributes of Android relativelayout]

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Android: layout_above: place the bottom of the control on the control of the given ID
Android: layout_below: place the top of the control under the control of the given ID
Android: layout_toleftof align the right edge of the control with the left edge of the control with the given ID
Android: layout_torightof align the left edge of the control with the right edge of the given ID

Android: layout_alignbaseline align the baseline of the control with the given ID
Android: layout_alignbottom: Align the bottom edge of the control with the given ID
Android: layout_alignleft: Align the left edge of the control with the given ID
Android: layout_alignright: Align the right edge of the control with the right edge of the given ID
Android: layout_top align the top edge of the control and the top edge of the control with the given ID

Android: alignparentbottom if the value is true, the bottom of the control is aligned with the bottom of the parent control.
Android: layout_alignparentleft if the value is true, the left side of the control is aligned with the left side of the parent control.
Android: layout_alignparentright if the value is true, the right side of the control is aligned with the right side of the parent control.
Android: layout_alignparenttop if the value is true, the top of the control is aligned with the top of the parent control.

Android: layout_centerhorizontal if the value is true, the control will be placed in the center of the horizontal direction
Android: layout_centerinparent if the value is true, the control is placed in the center of the horizontal and vertical directions of the parent Control
Android: layout_centervertical if the value is true, the control is placed in the center of the vertical direction
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