Looking at the following image, the button on the left is android 2.1, the one on the right is 2.2:
As you can see the corners on the left image are not being applied correctly, but they look perfect in 2.2. The xml I'm using is here:
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:right="0dip" android:left="0dip" android:bottom="0dip"
android:top="0dip">
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners android:bottomRightRadius="3dip"
android:bottomLeftRadius="3dip" android:topLeftRadius="3dip"
android:topRightRadius="3dip" />
<stroke android:width="1dip" android:color="#70532B" />
<padding android:left="1dip" android:top="1dip"
android:right="1dip" android:bottom="1dip" />
</shape>
</item>
<item android:right="0dip" android:left="0dip" android:bottom="0dip"
android:top="9dip">
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient android:startColor="#ECAF08" android:endColor="#F6E34B"
android:angle="270" />
<corners android:bottomRightRadius="3dip"
android:bottomLeftRadius="3dip" android:topLeftRadius="0dip"
android:topRightRadius="0dip" />
</shape>
</item>
<item android:right="0dip" android:left="0dip" android:bottom="11dip"
android:top="0dip">
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient android:startColor="#FCEF94" android:endColor="#FFBA00"
android:angle="270" />
<corners android:bottomRightRadius="0dip"
android:bottomLeftRadius="0dip" android:topLeftRadius="3dip"
android:topRightRadius="3dip" />
</shape>
</item>
am i doing something wrong, or is this a bug in android 2.1???