Question

Need help to edit the code below. Am using it play a lottery game in Android Studio what i need help with is if play one game u need to clear it up before u could another game.

Here is my 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>

Here is the MainActivity.java code below

package com.believe.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 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(70)+1;

            if(!winningWhiteBalls.contains(num))

            {

                winningWhiteBalls.add(num);

                i++;

            }

        }





        winningRedBall = ran.nextInt(25)+1;



    }



    @Override

    public void onClick(View v) {



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



        ArrayList 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 > 25)

            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);

        }



    }

}

Answer 1

xml. file which  ask the user to confirm that game should be played again or not

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:showIn="@layout/activity_playagain">
    <Button
        android:layout_width="wrap_content"
       android:layout_height="wrap_content"
        android:id="@+id/p1"
        android:text="PLAY_AGAIN"
        android:onClick="PLAY_AGAIN"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="100dp" />

</RelativeLayout>

java code do you want to play another game

import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;
public class playagain extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_playagain);
    }
    public void play(View view) {
        Button Play  = (Button) findViewById(R.id.p1);
Play.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = getIntent();
                AlertDialog.Builder adb = new AlertDialog.Builder(logut.this);
                adb.setMessage("confirm , you want to play again?");
                adb.setPositiveButton("yes", new

DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                finish();
                            }
                        });
                       

                adb.setNegativeButton("no", new

DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                dialog.cancel();
                            }
                        });

                AlertDialog alert = adb.create();
                alert.show();
            }
        });
    }
}