Today i'm gonna show how to extract the color's component Alpha, Red, Green and Blue from an integer value that presents a specific color. The code is very simple and self-explanatory.
/**
* Returns the color components as alpha, red, green and blue parts in an array.
*
* argb[0] = alpha value
* argb[1] = red value
* argb[2] = green value
* argb[3] = blue value
*
* @param color the color value
* @return the array containing the color components
*/
public static int[] getARGB(int color) {
/**
* Shift all pixels 24 bits to the right.
* Do a logical and with 0x000000FF
* i.e. 0000 0000 0000 0000 0000 0000 1111 1111
* You will get the alpha value for the color
*/
int alpha = (color >> 24) & 0x000000FF;
/**
* Shift all pixels 16 bits to the right.
* Do a logical and with 0x000000FF
* i.e. 0000 0000 0000 0000 0000 0000 1111 1111
* You will get the red value for the color
*/
int red = (color >> 16) & 0x000000FF;
/**
* Shift all pixels 8 bits to the right.
* Do a logical and with 0x000000FF
* i.e. 0000 0000 0000 0000 0000 0000 1111 1111
* You will get the green value for the color
*/
int green = (color >>8 ) & 0x000000FF;
/**
* Dont do any shift.
* Do a logical and with 0x000000FF
* i.e. 0000 0000 0000 0000 0000 0000 1111 1111
* You will get the blue value for the color
*/
int blue = (color) & 0x000000FF;
return new int[]{alpha,red,green,blue};
}
public static int manipulateAlpha(int color, int newAlpha) {
final int[] argb = getARGB(color);
return Color.argb(random.nextInt(argb[0]), argb[1], argb[2], argb[3]);
}
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