Android:relativelayout Property Description

Android:layout_above= "@id/xxx"-puts the control on top of the given ID control
android:layout_below= "@id/xxx"-places the control under the given ID control

android:layout_toleftof= "@id/xxx"-Aligns the right edge of the control with the left edge of the given ID control
android:layout_torightof= "@id/xxx"-aligns the left edge of the control with the right edge of the given ID control

android:layout_alignleft= "@id/xxx"-aligns the left edge of the control with the left edge of the given ID control
android:layout_aligntop= "@id/xxx"-aligns the top edge of the control with the top edge of the given ID control
android:layout_alignright= "@id/xxx"-Aligns the right edge of the control with the right edge of the given ID control
android:layout_alignbottom= "@id/xxx"-Aligns the bottom edge of the control with the bottom edge of the given ID control
Android:layout_alignparentleft= "true"-aligns the left edge of the control with the left edge of the parent control
Android:layout_alignparenttop= "true"-aligns the top edge of the control with the top edge of the parent control
Android:layout_alignparentright= "true"-aligns the right edge of the control with the right edge of the parent control
Android:layout_alignparentbottom= "true"-aligns the bottom edge of the control with the bottom edge of the parent control
Android:layout_centerinparent= "true"--places the control in the center of the parent control
Android:layout_centerhorizontal= "true"--places the control in the center of the horizontal direction
Android:layout_centervertical= "true"--places the control in the center of the vertical direction

Android:relativelayout Property Description