Android Generate Random String

Android Generate Random String

This post about how to  generate random char using Random class.

Random random = new Random();

This is list of char 

private static final String _CHAR = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";

Random string length

private static final int RANDOM_STR_LENGTH = 12;
This method for generate only numbers

private int getRandomNumber() {

            int randomInt = 0;

            randomInt = random.nextInt(_CHAR.length());

            if (randomInt - 1 == -1) {

                  return randomInt;

            } else {

                  return randomInt - 1;

            }

      }

This method for generate numbers with char.

    public String getRandomString(){

            StringBuffer randStr = new StringBuffer();

            for (int i = 0; i < RANDOM_STR_LENGTH; i++) {

                  int number = getRandomNumber();

                  char ch = _CHAR.charAt(number);

                  randStr.append(ch);

            }

            return randStr.toString();

      }

  

Screen Shot

Full Source Code

package com.androidbunch.generaterandomnumber;

import java.util.Random;

import android.os.Bundle;

import android.app.Activity;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;