Relativelayout property values in relative layouts

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"  - -Place the control in the center of the horizontal direction
Android:layout_centervertical= "true"  --place the control in the center of the vertical direction

One of the important android:layout_alignparentleft= "true"-aligns the left edge of the control with the left edge of the parent control

Relativelayout property values in relative layouts