Android: Set Random colour background on create

Question

What I want is when I load my app up it to randomly have a certain colored background from a predefined list of strings stored in a values xml file called colours.

Answer 1

You could set a variable Random rnd = new Random(); as a random number (will generate a psuedo-random number between 0 and 1). Then you could say:

    if (rnd < 0.09) {
        //pick first colour
    } else if (rnd >= 0.09 && rnd < 0.18) {
        //pick second colour
    } else if (rnd >= 0.18 && rnd < 0.27) {
        //pick second colour    
    } else // etc etc up to 1.0 when you will have 9 options, each with an equal chance of randomly being picked

This way, the random number rnd will determine which colour the background is each time onCreate() is called.