How to fill space between two views within a RelativeLayout

Here is my solution

<RelativeLayout
     ...
   >
        <YourLayout
         android:id="@+id/toplayout"
         android:layout_alignParentTop="true"
        />

        <YourLayout
         android:id="@+id/bottomlayout"
         android:layout_alignParentBottom="true"
        />

        <MiddleLayout 
          <!-- in your case it is FrameLayout -->
           android:layout_width="match_parent"
           android:layout_height="match_parent" 
          <!-- or android:layout_height="wrap_content" according to the_profile -->
           android:layout_below="@+id/toplayout" 
           android:layout_above="@+id/bottomlayout"/>
    </RelativeLayout>

Hope this help

You could take an advantage of weighting. android:layout_weight property usually fills whatever space is left (or split equally). In your case it would be something like this:

<LinearLayout 
   android:layout_width="match_parent"
   android:layout_height="some_fixed_height"
   android:orientation="vertical">

    <LinearLayout
            android:id="@+id/top_one"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

    <LinearLayout
            android:id="@+id/middle_one_that_fills"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1">


    <LinearLayout
            android:id="@+id/bottom_one"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">   

</LinearLayout>

As long as your root layout is a RelativeLayout and you're using layout_alignParentTop for the top view and layout_alignParentBottom for the bottom view, like you mentioned, then it should be working with no need for a middle view:

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <View
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"/>

    <View
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"/>
</RelativeLayout>

Alternatively, if your root view is a LinearLayout, you could use the lesser-known, but aptly-named Space view. Space is:

a lightweight View subclass that may be used to create gaps between components in general purpose layouts.

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <View
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"/>

    <Space
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="9"/>

    <View
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"/>
</LinearLayout>