android - How to use layout_below in RelativeLayout? -

here code(not code,i have deleted some):

<relativelayout         android:id="@+id/info_in_my"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:layout_below="@id/head_in_my"         android:layout_margintop="@dimen/spacing_size_36dp">          <imageview             android:id="@+id/pic_in_my"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_marginstart="@dimen/spacing_size_36dp"             android:layout_alignparentstart="true"             android:src="@mipmap/icon_policeman" />         <textview             android:id="@+id/name_in_my"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="aaaaaa"             android:layout_toendof="@id/pic_in_my"             android:layout_centerinparent="true"             android:textcolor="@color/font_white"             android:textsize="@dimen/font_size_18sp" />          <textview             android:id="@+id/organization_in_my"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="bbbbbbbbbbbbbbbbb"             android:layout_below="@+id/name_in_my"             android:layout_toendof="@+id/pic_in_my"             android:textsize="@dimen/font_size_12sp"             android:textcolor="@color/font_white" />      </relativelayout> 

this result:

i want string bbbbbbbbb below string aaaaaa, it's not right.

and deleted android:layout_centerinparent="true" in first textview no changes.

is android:layout_below="@+id/name_in_my" useless when first view uses android:layout_centerinparent="true"

i want know why?

to answer question, "how use layout_below in relativelayout?", check example:

<button android:id="@+id/b1"     .... /> <button android:id="@+id/b2"     android:layout_below="@id/b1"     .... /> 

this means want button b2 below b1. note used @id instead of @+id because added id b1 in declaration of button b1, thus, there no reason add again.

since want bbbbb below aaaa, have put layout_below="id of aaaa" in bbbb.

android:layout_centerinparent means want view @ center of parent, in case whole relative layout.