CODEWITHSUNDEEP
androidbitmap
Umesh
Umesh

Reputation: 1609

How to change black background color of bitmap to transparent?

I am creating Bitmap using following code:

Bitmap bm= Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);

But I want to change Background color from black to transparent because I want to use this object in another Activity also. I searched a lot but I am unable to find solution. Please help. Thanks in advance.

Upvotes: 7

Views: 15602

Answers (2)

thearti
thearti

Reputation: 371

Of course the Bitmap created in mode ARGB_8888 supports transparency But the alpha channel is initially filled by 0xff, so bitmap is opaque. You have to clear the whole bitmap including the alpha channel like this:

Canvas c = new Canvas(bm);
c.drawColor(0, Mode.CLEAR);

Upvotes: 13

Quintin B
Quintin B

Reputation: 5881

Bitmap images do not support transparency. You should use a GIF or a PNG.

http://www.gimpchat.com/viewtopic.php?f=8&t=1290

Upvotes: -1

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