How to draw a bitmap with transparency

Question

How to draw a bitmap with a given color set as transparent?
For example I want all white pixels to be transparent.

Answer 1

You need to set the Alpha value for the paint you're passing to the Bitmap.

http://developer.android.com/reference/android/graphics/Paint.html#setAlpha%28int%29

Values vary from 0-255

EDIT:

Paint p = new Paint();
//Set Blue Color
p.setColor(Color.WHITE);
//Set transparency roughly at 50%
p.setAlpha(125);

Answer 2

you need to check every pixel of image and change its color. you will get your answer in this Post