Background image in linear layout is not well sized

I made a linear layout with a background image, a png... I don't know how to sh开发者_JAVA百科ow it into the layout ( and centered ) keeping proportions... here is the code

<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/background">

Obviously image has the same height and width of the display... Any help?? Thanks in advance

=.4.S.=

Thank you all ^^ I solved in this way:

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

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


    <ImageView xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/background"
        android:layout_gravity="center"/>


    <ListView android:id="@+id/android:list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:divider="#FFFFFF"
        android:layout_weight="2"
        android:drawSelectorOnTop="false"
        android:layout_gravity="center"/>

</FrameLayout>

Try this related question/answer:

Android: Scale a Drawable or background image?

I haven't tried it, but it sounds similar to what you're talking about.

If you do not want your picture to be stretched, you can use BitmapDrawable with gravity set us instead of png.
Refer docs: Bitmap