Android Current layout

<relativelayout xmlns:android= "Http://schemas.android.com/apk/res/android"Xmlns:tools= "Http://schemas.android.com/tools"android:orientation= "Vertical"Android:layout_width= "Fill_parent"Android:layout_height= "Fill_parent"android:gravity= "Bottom|center_vertical"Android:paddingbottom= "@dimen/activity_vertical_margin"Android:paddingleft= "@dimen/activity_horizontal_margin"Android:paddingright= "@dimen/activity_horizontal_margin"Android:paddingtop= "@dimen/activity_vertical_margin"Tools:context=". Mainactivity "> <Button Android:id= "@+id/bn1"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:text= "@string/bn1"/> <Button Android:id= "@+id/bn2"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:text= "@string/bn2"/> <Button Android:id= "@+id/bn3"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:text= "@string/bn3"/> <Button Android:id= "@+id/bn4"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:text= "@string/bn4"/></relativelayout>