Android: Help with two linear layout that overlaps each other!

I would like to have two linear layouts inside a third parent layout. I would like the first linear layout ori开发者_Python百科entation to be horizontal and the second one to be vertical.

I tried to achieve this by the following code. However, the second linear layout do not appear.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:background="#FFFFFF">
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:orientation="horizontal"
  android:gravity="center_horizontal"
  >
<ImageButton android:id="@+id/ImageButton01"
android:layout_width="80px" 
android:layout_height="80px"
android:background="@drawable/projects_badge"
android:layout_margin="10px"/>
</LinearLayout>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:orientation="vertical"
  android:gravity="center_horizontal"
  >
<ImageView android:id="@+id/ImageView01"
    android:layout_width="200px" 
    android:layout_height="81px" 
    android:src="@drawable/logo"
    android:adjustViewBounds="true"
    android:layout_marginTop="15px"/>
<TextView android:id="@+id/TextView01"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"
    android:gravity="center_horizontal"
    android:textColor="#9CC721"/>
</LinearLayout>
</LinearLayout>

Any help will be appreciated.

Thanks in advance.

I think you need to specify android:orientation attribute inside the Parent Layout as well.

Tips:

dp and dip are more preferrable than px.

Update:

your parent layout should be like:

<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:background="#FFFFFF"
android:orientation="vertical">

your image view in 2nd sub-layout should be like:

<ImageView android:id="@+id/ImageView01"
    android:layout_width="200px" 
    android:layout_height="81px" 
    android:src="@drawable/logo"
    android:adjustViewBounds="true"
    android:layout_marginTop="15px"
 android:scaleType="center"/>