I tried to make a simple layout like so
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <LinearLayout
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="hello" />
    </LinearLayout>
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="world" />
</LinearLayout>
Only the first TextView ("hello") is displayed. What am I doing wrong?
Make layout_height of inner layout wrap_content.
Your second LinearLayout is set to fill_parent in the layout's height.  This is causing it to push out everything that's below it that was placed into the first LinearLayout.  Change it to wrap_content and it should work.
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