Android linear layout align center and right -

this have:

    <?xml version="1.0" encoding="utf-8"?> <linearlayout android:id="@+id/linearlayout01"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="vertical"     android:background="#ffffff">     <linearlayout android:id="@+id/linearlayout01"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         xmlns:android="http://schemas.android.com/apk/res/android"         android:orientation="horizontal"         android:background="#e30000"         android:layout_gravity="center_horizontal|center_vertical"         android:gravity="center_horizontal|center_vertical">         <textview              android:id="@+id/textview00"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:textcolor="#ffffff"             android:textsize="20px"             android:textstyle="bold"             android:text="something"             android:gravity="right|center_vertical"             />         <linearlayout android:id="@+id/linearlayout01"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             xmlns:android="http://schemas.android.com/apk/res/android"             android:orientation="horizontal"             android:gravity="right|center_vertical"             android:layout_gravity="center_vertical"             android:background="#e30000">             <button                  android:id="@+id/btncalls"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:drawableleft="@drawable/icon"                 android:gravity="right|center_vertical"             />         </linearlayout>     </linearlayout> </linearlayout> 

and want this:

so horizontal center align text , vertical center align button.

what missing? haven't tried relativelayout , prefer linearlayout work out.

try 1

<?xml version="1.0" encoding="utf-8"?> <linearlayout android:id="@+id/linearlayout01"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="vertical"     android:background="#ffffff">     <linearlayout android:id="@+id/linearlayout01"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         xmlns:android="http://schemas.android.com/apk/res/android"         android:orientation="horizontal"         android:background="#e30000"         android:layout_gravity="center_horizontal|center_vertical"          android:gravity="center_vertical">         <textview              android:id="@+id/textview00"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:textcolor="#ffffff"             android:textsize="20px"             android:textstyle="bold"             android:text="something"             android:layout_weight="1"              android:gravity="center"/>         <linearlayout android:id="@+id/linearlayout01"             android:layout_height="wrap_content"             xmlns:android="http://schemas.android.com/apk/res/android"             android:orientation="horizontal"             android:gravity="right|center_vertical"             android:layout_gravity="center_vertical"             android:background="#e30000"                             android:layout_width="wrap_content">             <button                  android:id="@+id/btncalls"                 android:layout_width="wrap_content"                 android:drawableleft="@drawable/icon"                 android:gravity="right|center_vertical"                  android:layout_height="wrap_content"                  android:layout_margin="5dip"/>         </linearlayout>     </linearlayout> </linearlayout>