Aligning fragments with RelativeLayout

Question

I'm having real problems trying to align fragments with a RelativeLayout, though it seems this should be straightforward. I just need two fragments next to each other and if I use a LinearLayout it works fine:

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

   <fragment android:name="com.fragment.test.TitlesFragment"
            android:id="@+id/fragmentTitles"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="fill_parent"
     />

    <FrameLayout 
            android:id="@+id/details" 
            android:layout_weight="1"
            android:layout_width="0px"
            android:layout_height="fill_parent" 
    />

</LinearLayout>

However, if I use a RelativeLayout, nothing shows:

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

   <fragment android:name="com.fragment.test.TitlesFragment"
            android:id="@+id/fragmentTitles"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="fill_parent"
     />

    <FrameLayout 
            android:id="@+id/details" 
            android:layout_weight="1"
            android:layout_width="0px"
            android:layout_height="fill_parent" 
            android:layout_toRightOf="@id/fragmentTitles"            
    />

</RelativeLayout>

Update:

Here is a screenshot of what I'm seeing:

This is the code I'm using:

<?xml version="1.0" encoding="utf-8"?>

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

    <LinearLayout
        android:orientation="horizontal"
        android:layout_height="fill_parent"
        android:layout_width="fill_parent"
        android:weightSum="3"
    >
        <fragment android:name="com.fragment1"
                android:id="@+id/fragment1"
                android:layout_weight="1"
                android:layout_width="0dp"
                android:layout_height="fill_parent"
                android:layout_above="@id/statusUpdated"
         />

        <fragment android:name="com.fragment2"  
                android:id="@+id/fragment2"
                android:layout_width="0px"
                android:layout_weight="2"
                android:layout_height="fill_parent"
                android:layout_above="@id/statusUpdated"        
                android:layout_toRightOf="@id/fragment1"
         />

    </LinearLayout>

    <TextView android:id="@+id/statusUpdated" style="@style/Status" />

</RelativeLayout>

Solution

You can't use weights with a RelativeLayout. Basically that attribute gets ignored, meaning both your fragments render with a width of 0, hence they are not visible.

I'm not sure what you're trying to accomplish, but you might want to consider wrapping your first example (the LinearLayout) into a RelativeLayout - in other words: combine/integrate both layouts. That does result in another level in your view hierarchy though.

---

Edit:

I haven't actually tested it, but I reckon something like this is what you're looking for:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent">

    <LinearLayout 
        android:id="@+id/fragment_layout"
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent"
        android:layout_above="@+id/footer_view" 
        android:weightSum="3">

        <fragment 
            android:id="@+id/fragmentTitles" 
            android:name="com.fragment.test.TitlesFragment"
            android:layout_width="0dp" 
            android:layout_height="fill_parent"
            android:layout_weight="1" />

        <FrameLayout 
            android:id="@+id/details"
            android:layout_width="0dp" 
            android:layout_height="fill_parent"
            android:layout_weight="2" />
    </LinearLayout>

    <TextView 
        android:id="@+id/footer_view" 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" 
        android:layout_alignParentBottom="true"
        android:background="#f00" 
        android:text="I am a footer" />

</RelativeLayout>

Obviously you can replace the TextView with anything you like.