How to generate a random number, then display it on screen?

Ok, im fairly n开发者_运维问答ew to android but i have managed to teach myself the basics, i am making an app where you press a button , and a new screen opens and it shows a randomly generated number, the only problem is i dont know how to generate and display the random number, i have been searching the web for ages and have only found little snippets of information , that dosent really make sense to me. :/

If someone could help me , or even give me just a little bit of info that should guide me in the right direction it would be great

EDIT: (for the comment below)

    super.onCreate(savedInstanceState);
    TextView tv = new TextView(this);
    tv.setText("Random Number : " + Math.random());
    int random = (int)Math.ceil(Math.random()*100);
    setContentView(tv);

Thats the code i have , where have i gone wrong ^^^^ :/

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Android's documentation is excellent. Here's a hello world app:

http://developer.android.com/guide/tutorials/hello-world.html

Just change

tv.setText("Hello, Android");

to

tv.setText("Random Number: " + Math.random());

and make sure to import the Math library (if you're using eclipse, hit Ctrl+Shift+O).

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below code return a value in Integer:-

    public static int randomBox() {

    Random rand = new Random();
    int pickedNumber = rand.nextInt(100);
    return pickedNumber;

}

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Random rand = new Random();
String randomInt = list.get(rand.nextInt(list.size()));

it may be help for you

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    Random r = new Random();

    StringBuffer temp = new StringBuffer("Random numbers:");
    for (int i = 0; i < 10; i++) {
        int i1 = r.nextInt(100 - 0) + 0;
        temp.append(String.valueOf(i1));
        temp.append(String.valueOf(" "));
    }
    return temp.toString();

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Here is your documentation for Random. Beyond that I'm not sure if you want to launch an Activity or update a TextView or what have you. However, I strongly recommend reading the documentation for Activity as well as common tasks in android and User Interface. These should help you understand what you are trying to do.

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Actually, you could easily use :

yourVariable = Math.random();

Should work in Android. Gives you a number between 0 and 1. Then you give yourVariable to a TextView with the method .setText(yourVariable) for instance...

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If you are willing to devloper your own algorithms to generate random number, pick any algo and implement in any language of preference. https://en.wikipedia.org/wiki/List_of_random_number_generators

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int number = (new Random().nextInt(100));

a random number will be assigned to variable number, each time it is used

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Different way, but simple:)

    Calendar c = Calendar.getInstance();
    final int seconds = c.get(Calendar.SECOND);

    Random r = new Random();
    final int n = r.nextInt(80 - 65) + 65;

    Toast.makeText(getApplicationContext(), ""+ n + seconds, Toast.LENGTH_SHORT).show();  

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        Random r = new Random();
        rendomNumber = r.nextInt(80- 65) + 65;
        System.out.print(""+rendomNumber )