[android-developers] transparent images

hi guys,
i am trying to overlap two images, a transparent one over an opaque
button background. Three simple lines:
res = getResources();
Drawable spinImage = res.getDrawable(R.drawable.n8);
((Button)
findViewById(R.id.spinButton_5)).setBackgroundDrawable(spinImage);

i also used setBackgroundResource instead of setBackgroundDrawable ..

the problem is that i am losting the background image, not overlaping
happend, the new transparent image replace the whole opaque
background. I have to use clickable buttons an doit from source code
because the image file name is variable.

the image is transparent for sure ...

what is wrong ?

thanks for help

hector

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