Question

Create a Lottery application in Android Studio that simulates a lottery game. The application should allow the play to type in number to generate five numbers and one red ball. The constructor should use the Random class to generate a random number in the range of 1 through 69 for the red ball 1 through 26. In Android Studio

Answer 1

<!—activity_main.xml -->

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="simpleapps.my.lotteryapplication.MainActivity"
    android:orientation="vertical"
    android:layout_margin="10dp"
    android:weightSum="100">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:text="Enter White Balls : "
        android:textColor="#000000"
        android:textSize="22sp"
        android:layout_weight="15"
        />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:orientation="horizontal"
        android:weightSum="100"
        android:layout_margin="10dp"
        android:layout_weight="15">

        <EditText
            android:id="@+id/wBall1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="20"
            android:inputType="number"/>

        <EditText
            android:id="@+id/wBall2"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="20"
            android:inputType="number"/>

        <EditText
            android:id="@+id/wBall3"
            android:layout_width="0dp"
           android:layout_height="wrap_content"
            android:layout_weight="20"
            android:inputType="number"/>

        <EditText
            android:id="@+id/wBall4"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="20"
            android:inputType="number"/>

        <EditText
            android:id="@+id/wBall5"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="20"
            android:inputType="number"/>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:orientation="horizontal"
        android:weightSum="100"
        android:layout_weight="15">

    <TextView
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="Enter Red Ball : "
        android:textSize="22sp"
        android:textColor="#000000"
        android:layout_weight="60"/>

        <EditText
            android:id="@+id/rBall"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="30"
            android:inputType="number"/>

    </LinearLayout>

    <Button
        android:id="@+id/winBtn"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:layout_weight="15"
        android:layout_gravity="center"
        android:text="Winning Numbers"
      />


    <TextView
        android:id="@+id/wResult"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:text="White Balls : "
        android:textColor="#000000"
        android:textSize="20sp"
        android:layout_marginTop="20dp"
        android:layout_weight="15"/>

    <TextView
        android:id="@+id/rResult"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_marginTop="20dp"
        android:text="Red Ball : "
        android:textColor="#000000"
        android:textSize="20sp"
        android:layout_weight="15"/>


</LinearLayout>

<!— end of activity_main.xml -->

//MainActivity.java

package simpleapps.my.lotteryapplication;



import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

import android.widget.Toast;



import java.util.ArrayList;

import java.util.Random;



public class MainActivity extends AppCompatActivity implements View.OnClickListener {



    private EditText wBall1, wBall2, wBall3, wBall4, wBall5, rBall;

    private TextView wResult, rResult;



    private Button winBtn;



    private Random ran ;

    private ArrayList<Integer> winningWhiteBalls;

    private int winningRedBall;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);



        ran = new Random();

       

        winBtn = findViewById(R.id.winBtn);

        wBall1 = findViewById(R.id.wBall1);

        wBall2 = findViewById(R.id.wBall2);

        wBall3 = findViewById(R.id.wBall3);

        wBall4 = findViewById(R.id.wBall4);

        wBall5 = findViewById(R.id.wBall5);

        rBall = findViewById(R.id.rBall);



        wResult = findViewById(R.id.wResult);

        rResult = findViewById(R.id.rResult);



        winBtn.setOnClickListener(this);

    }

    

    private void generateWinningNumbers()

    {

        winningWhiteBalls = new ArrayList<>();

        for(int i=0;i<5;)

        {

            int num = ran.nextInt(69)+1;

            if(!winningWhiteBalls.contains(num))

            {

                winningWhiteBalls.add(num);

                i++;

            }

        }





        winningRedBall = ran.nextInt(26)+1;



    }



    @Override

    public void onClick(View v) {



        int wball1,wball2,wball3,wball4,wball5, rball;



        ArrayList<Integer> allowedNumbers = new ArrayList<>();

        for(int i=1;i<70;i++)

            allowedNumbers.add(i);



        wball1 = Integer.parseInt(wBall1.getText().toString());

        wball2 = Integer.parseInt(wBall2.getText().toString());

        wball3 = Integer.parseInt(wBall3.getText().toString());

        wball4 = Integer.parseInt(wBall4.getText().toString());

        wball5 = Integer.parseInt(wBall5.getText().toString());

        rball = Integer.parseInt(rBall.getText().toString());



        boolean validNumbers = true;



        if(!allowedNumbers.contains(wball1))

            validNumbers = false;

        else

            allowedNumbers.remove(new Integer(wball1));



        if(!allowedNumbers.contains(wball2))

            validNumbers = false;

        else

            allowedNumbers.remove(new Integer(wball2));



        if(!allowedNumbers.contains(wball3))

            validNumbers = false;

        else

            allowedNumbers.remove(new Integer(wball3));



        if(!allowedNumbers.contains(wball4))

            validNumbers = false;

        else

            allowedNumbers.remove(new Integer(wball4));



        if(!allowedNumbers.contains(wball5))

            validNumbers = false;

        else

            allowedNumbers.remove(new Integer(wball5));



        if(rball < 1 || rball > 26)

            validNumbers = false;



        if(!validNumbers)

            Toast.makeText(getApplicationContext(),"Invalid number(s) selected",Toast.LENGTH_SHORT).show();

        else {

            generateWinningNumbers();

            for (int i = 0; i < winningWhiteBalls.size(); i++)

                wResult.setText(wResult.getText().toString() + " " + winningWhiteBalls.get(i));



            rResult.setText(rResult.getText().toString() + " " + winningRedBall);

        }



    }

}

//end of MainActivity.java

Output: