android weightSum not working properly

I have a layout with three elements and its orientation is 'horizontal' I want to fix the size that each element occupy in my layout. first element should take 40% of the total space then second element should occupy 5% and third one should occupy remaining 55% space. My layout look like this: ``` <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:weightSum="100" > <TextView android:id="@+id/outletname" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="40" android:text="@string/outlet_name2" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="5" android:text=": " /> <TextView android:id="@+id/outletnamevalue" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="55" android:text="abcdefttt" /> </LinearLayout> </LinearLayout> ``` text in 'TextView' will change dynamically , So I want to keep the constant space for elements irrespective of the content in views...