Hey folkes, I need a bit of help with learning how to layout my app.  I'm 
fairly new to Android programming, and so far the most difficult aspect I 
have been finding is getting the layout for my app just the way I want it. 
 I'm after going through tutorials, video tutorials, etc, but I can't seem 
to figure out what I'm doing wrong here.  I'm sure its something basic.

First off, here is a drawing of how I would like my App to appear on a 
screen in standard vertical:

http://img37.imageshack.us/img37/7867/layoutiq.png

Now, a little bit of explanation:

- All my buttons have images for backgrounds, so they are all fixed size so 
it looks right
- The red and green boxes just groups together the widgets, but obviously 
doesn't appear on screen
- I would like my Header Image to stay at the top of the screen
- The elements btn2 and btn3 in the red box must stay at the bottom of the 
screen, with the btn3 being located to the top-right of btn2 and on the 
right-side of the screen.  And btn2 situated in the bottom-left of the 
screen.
- The elements btn1 and txt1 inside the green box should take up all space 
not being used between the header image and the red box.  Also, it must be 
center and near the top of the green box.

The current layout in my main.xml file almost gets the above right, except 
the red box pushes "up" causing the green box to shrink leaving space at the 
bottom of the screen.  I can't figure out how to fix that so it isn't 
pushing up.

Here is the code in my main.xml:


<?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"
    android:background="@drawable/bg"
    android:gravity="top">
    <LinearLayout 
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="184px"
    android:gravity="top">
    <ImageView 
    android:layout_height="wrap_content" 
    android:src="@drawable/header" 
    android:layout_width="fill_parent" 
    android:id="@+id/imageView1">
    </ImageView>
    </LinearLayout>
    <LinearLayout
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center">
    <Button 
    android:background="@drawable/btn1" 
    android:id="@+id/btn1" 
    android:layout_height="100dp" 
    android:layout_width="114dp">
    </Button>
    <TextView 
    android:gravity="center_horizontal" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:layout_height="wrap_content" 
    android:layout_width="fill_parent" 
    android:lines="2" 
    android:id="@+id/txt1">
    </TextView>
    
    
    </LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:
android:gravity="bottom">
<LinearLayout
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="bottom|left">
<Button 
android:id="@+id/btn2" 
android:background="@drawable/btn2" 
android:layout_height="176dp" 
android:layout_width="189dp">
</Button>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="2dp"
android:gravity="top|right">
<Button
android:background="@drawable/btn3"
android:id="@+id/btn3"
android:layout_height="88dp" android:layout_width="102dp">
</Button>
</LinearLayout> 
</LinearLayout>
</LinearLayout>


Keep in mind that I'm very new to this, so its probably something very 
obvious that I'm missing here.

Any help will be greatly appreciated.

Thank you.

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