android Bitmap getPixel

问题

I need to get the color of a pixel in order to compare it with a color from my color.xml file, but all values are negative and this comparison will always return a false result. How to get the proper color value? This color may be transparent. I've read this but I need an answer, not a link to theory.

bmp.getPixel(n.x, n.y) is returning zero when I'm expecting to return a propper value for color #00FFFFFF

Thanks

回答1:

You could do something like this:

int pixel = Color.RED; //bmp.getPixel(n.x, n.y);
int a = Color.alpha(pixel);
int r = Color.red(pixel);
int g = Color.green(pixel);
int b = Color.blue(pixel);

String color = String.format("#%02X%02X%02X%02X", a, r, g, b); //#FFFF0000 for RED color

but instead of Color.RED you can put your bmp.getPixel(...) method.

Hope that helps

Best Regards

来源：https://stackoverflow.com/questions/9646899/android-bitmap-getpixel

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android