Posting my solution here in case anyone runs into the same problem,.
You can set the alpha to 0xFF using the DST_ATOP mode. Here's my code
to extract the alpha and colors properly :
// HACK : We need to force the alpha to 0xFF, or getPixels will
return us black for the RGB channels.
// So we first retrieve the existing pixels, but will only look
at
the alpha component. then, we make
// a copy of the bitmap, on which we paint the alpha channel to
fully opaque, which will let us extract the
// color components properly. We will then merge the two arrays
together.
int[] arPixelsAlpha = new int[numPixels];
int[] arPixelsColor = new int[numPixels];
Bitmap bitmapCopy = Bitmap.createBitmap(width, height,
Bitmap.Config.ARGB_8888);
Canvas canvasCopy = new Canvas(bitmapCopy);
canvasCopy.drawBitmap(bitmap, new Matrix(), new Paint());
canvasCopy.drawColor(0xFF000000, Mode.DST_ATOP);
bitmap.getPixels(arPixelsAlpha, 0, width, 0, 0, width, height);
bitmapCopy.getPixels(arPixelsColor, 0, width, 0, 0, width,
height);
After that, for each pixel, grab the alpha value from (arPixelsAlpha
[i] & 0xFF000000), and the color component from (arPixelsColor[i] &
0x00FFFFFF)
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