[android-developers] Setting density-specific drawable as button background

I have a few buttons in my application that don't have any text, only background drawable. I need to make it so that the drawable is taken from an appropriate drawable-?dpi folder, and then displayed without resizing. The first part works, the appropriate image file is selected. However, it is still resized no matter what layout_height and layout_width attributes the button has. My question is: how to defeat this, and make drawables map to screen pixel-to-pixel?

The only way I can make it not to resize is to specify width and height in px, which is exactly what I don't want to do.

Here's what my layout looks like:

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="wrap_content" xmlns:tools="http://schemas.android.com/tools">

    <LinearLayout

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:orientation="vertical" >

        <RelativeLayout

            android:layout_width="fill_parent"

            android:layout_height="wrap_content"

            android:paddingBottom="3dp"

            android:paddingTop="3dp" >

            <Button

                android:id="@+id/btn"

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:background="@drawable/btn" />

        </RelativeLayout>

    </LinearLayout>

</ScrollView>

P. S. Is there any way to create a file similar to "dimensions.xml" in which I could define px sizes of my drawable for different DPI screens? I already have "dimensions.xml" for large and normal screens

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