Relativelayout layout (valid only in relativelayout)

Android: layout_alignparentleft = "true" in the relative position of the parent layout // on the left of the layout

Android: layout_alignparentright = "true" // on the right of the Layout

Android: layout_alignparenttop = "true" // above the Layout

Android: layout_alignparentbottom = "true" // under the Layout

 

Relative Position of a widget

Android: layout_torightof = "@ ID/button1" // on the right side of the control button1, not just close

Android: layout_toleftof = "@ ID/button1" // on the left side of the control button2, not just close

Android: layout_below = "@ ID/button1" // under the control button1, not just at the bottom

Android: layout_above = "@ ID/button1" // on the control button1, not just the upper side

 

Definition and a widget

Android: layout_aligntop = "@ ID/button1" // aligntop = "@ ID/button1"

Android: layout_alignbottom = "@ ID/button1" // align with the lower part of the control button1

Android: layout_alignleft = "@ ID/button1" // align left with the control button1

Android: layout_alignright = "@ ID/button1" // right-aligned with the control button2

 

Android: layout_centerhorizontal = "true" // horizontally centered
Android: layout_centervertical = "true"
Android: layout_centerinparent = "true"

Relativelayout layout (valid only in relativelayout)