Question

How can I replace the black color in a bitmap with red (or any other color) programmatically in Android (ignoring transparency)? I can replace the white color in the bitmap with a color already but it somehow does not work with black.
Thanks for help.

Answer 1

Get all the pixels in the bitmap using this:

int [] allpixels = new int [myBitmap.getHeight() * myBitmap.getWidth()];

myBitmap.getPixels(allpixels, 0, myBitmap.getWidth(), 0, 0, myBitmap.getWidth(), myBitmap.getHeight());

for(int i = 0; i < allpixels.length; i++)
{
    if(allpixels[i] == Color.BLACK)
    {
        allpixels[i] = Color.RED;
    }
}

myBitmap.setPixels(allpixels,0,myBitmap.getWidth(),0, 0, myBitmap.getWidth(),myBitmap.getHeight());