How to set this Layout that fit to Any Screen height?

Question

I have Some layout Problem regarding my Application. This is My Application Layout:

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

<ImageView android:layout_width="fill_parent" android:layout_height="wrap_content" 
    android:src="@drawable/tax_calculator_logo"/>
<LinearLayout android:layout_height="fill_parent" android:layout_width="fill_parent"
    android:orientation="vertical" android:layout_marginLeft="20dp"
    android:layout_marginRight="20dp" android:layout_gravity="center" 
    android:layout_marginTop="10dp" android:layout_marginBottom="10dp">

    <Button android:id="@+id/contactUs" android:layout_height="wrap_content"
        android:layout_width="fill_parent" android:text="Contact Us"
        android:textSize="20dp"/>
    <Button android:id="@+id/contactUs" android:layout_height="wrap_content"
        android:layout_width="fill_parent" android:text="Contact Us"
        android:textSize="20dp"/>   
    <Button android:id="@+id/contactUs" android:layout_height="wrap_content"
        android:layout_width="fill_parent" android:text="Contact Us"
        android:textSize="20dp"/>   
    <Button android:id="@+id/contactUs" android:layout_height="wrap_content"
        android:layout_width="fill_parent" android:text="Contact Us"
        android:textSize="20dp"/>   
</LinearLayout>

Here, I want to set this all button to be complete fit with the height of the Screen of any device. Yes i can show all the Button. but i want them all to be have equat space between them and they must be fit complete to the Screen height. So what should i have to do for that ??

Edited:

And there is, My tax_calculator_logo is of 600x239 resolution and i have set the ImageView height as wrap_content and width with fill_parent then why the Image is croping from bottom and top ???

Answer 1

Give equal weight to each of your buttons, they will share height automatically.

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_gravity="center"
    android:layout_marginBottom="10dp"
    android:layout_marginLeft="20dp"
    android:layout_marginRight="20dp"
    android:layout_marginTop="10dp"
    android:orientation="vertical" >

    <Button
        android:id="@+id/contactUs"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="Contact Us"
        android:textSize="20dp" />

    <Button
        android:id="@+id/contactUs"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="Contact Us"
        android:textSize="20dp" />

    <Button
        android:id="@+id/contactUs"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="Contact Us"
        android:textSize="20dp" />

    <Button
        android:id="@+id/contactUs"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="Contact Us"
        android:textSize="20dp" />

</LinearLayout>