android - Make a view next to another and at the middle of its height -

i'm trying make activity numberpicker , textview , want textview next numberpicker , @ middle of numberpicker height (the tv going "choose number:") thing i've tried didn't worked. (i tried put 1 in different linearlayout , 2 linearlayouts in relativelayout , messed prefences , still didn't work)

here tried:

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    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" >      <textview        android:id="@+id/textview1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignparentend="true"        android:paddingtop="30dp"        android:text="@string/main"/>      <numberpicker        android:id="@+id/numberpicker1"        android:layout_width="30dp"        android:layout_height="wrap_content"        android:layout_alignparenttop="true"        android:layout_tostartof="@+id/textview1"        android:clickable="false"        android:paddingtop="0dp" />  </relativelayout> 

thanks!

i following kind of situations:

<textview     ...     android:layout_aligntop="@+id/numberpicker1"     android:layout_alignbottom="@+id/numberpicker1"     android:gravity="center_vertical" /> 

this way tex view appears in middle of number picker. way remind, should put number picker before text view if want try method.

good luck!