Generate a Random Color Java [duplicate]

Question

I am trying to create a random color by randomly generating numbers for R,G, and B values with a random number generator, and using the values to make a color. The following code is in my onCreate() method:

Random rand = new Random();
    // Java 'Color' class takes 3 floats, from 0 to 1.
    float r = rand.nextFloat();
    float g = rand.nextFloat();
    float b = rand.nextFloat();
    Color randomColor = new Color(r, g, b);

How come eclipse tells me "The constructor Color(float, float, float) is undefined"? Shouldn't this work correctly?

Answer 1

You should use nextInt(int n):int to generate a random integer between 0 and 255. (note that according to API the range is not checked within the Color methods so if you don't limit it yourself you'll end up with invalid color values)

// generate the random integers for r, g and b value
Random rand = new Random();
int r = rand.nextInt(255);
int g = rand.nextInt(255);
int b = rand.nextInt(255);

Then get an int color value with the static Color.rgb(r,g,b):int method. The only constructor that exists for android.graphics.Color is a non argument constructor.

int randomColor = Color.rgb(r,g,b);

Finally, as an example, use the setBackgroundColor(int c):void method to set a color background to a view.

View someView.setBackgroundColor(randomColor);

Answer 2

public int randomColor(int alpha) {

    int r = (int) (0xff * Math.random());
    int g = (int) (0xff * Math.random());
    int b = (int) (0xff * Math.random());

    return Color.argb(alpha, r, g, b);
}

can it help?