Draw Transparent background

Asked Jun 09 '14 at 19:58

Active Jun 09 '14 at 19:58

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I'm using a code which return me the biggest shape in a pic (with OpenCV Library on an android device). But my issue is that I want to return only the shape, at this moment my code is returning a Mat and when I draw it on a BitMap or another Mat, a black background is taking place instead of a transparent background as I want.

I've seen that we cant apparently use alpha channel with openCv and with Bitmap support, so my question is the following : How can I draw my Mat to get sort of PNG with transparent background to display on my android device ?

Thank you in advance. (and sorry for my poor english).

asked Jun 09 '14 at 19:58

Slayer

does this help http://stackoverflow.com/questions/1492554/set-transparent-background-of-an-imageview-in-android – Rachel Gallen Jun 09 '14 at 20:51
or try android:background="@null" – Rachel Gallen Jun 09 '14 at 20:52

Draw Transparent background

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