Question

If anyone here is a Java and Android Studio expert please I really need help fulfilling the requirements needed to make a Rock Paper Scissors game. I mainly need Java code to complete it I will post what I have so far I don't have much time left please if anyone can help me I would really appreciate it. Here's what the app is supposed to do... The player should be able to select either Rock, Paper, or Scissors.The app will randomly select Rock, Paper, or Scissors. The app will compare the results and display the winner. The player can click the play again button to be taken back to the first screen.

Inside of the RockPaperScissorsResultsActivity, wire the button that we placed in the view to an onClickEvent. Then, when the button is clicked, call finish(). This code will close the activity and the previously opened one will be there. Add event handlers for each of the buttons on the MainActivity.

Inside MainActivity, launch RockPaperScissorsResultsActivity for each of the button click events like Paper. Be sure to code the Rock button and Scissors button as well. Create an Application class. Be sure that both of your activities use it. Set the playerSelection for when a user clicks a button. The RockPaperScissorType is an enum. When RockPaperScissorsResult opens, get the player and computer selections and decide the winner. Bind the results to the widgets on the view. Add a clickListener to RockPaperScissorsResultActivity. When we click on the Play Again button, this activity should close and the user should be returned to the original.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:id="@+id/main_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Please select an option! "
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.063" />

    <Button
        android:id="@+id/btn_Rock"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Rock"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.504"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.286" />

    <Button
        android:id="@+id/btn_Paper"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Paper"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.501"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.56" />

    <Button
        android:id="@+id/btn_Scissors"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Scissors"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.503"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.77" />

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

package net.androidbootcamp.rockpaperscissors;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
}

activity_rock_paper_scissors_results.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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=".RockPaperScissorsResultsActivity">

    <TextView
        android:id="@+id/playerChoice"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Player Choice"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.237" />

    <TextView
        android:id="@+id/computerChoice"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Computer Choice"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.383" />

    <TextView
        android:id="@+id/results"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Results"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.526" />

    <Button
        android:id="@+id/btn_PlayAgain"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Play Again"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.691" />
</androidx.constraintlayout.widget.ConstraintLayout>

RockPaperScissorsResultsActivity.java

package net.androidbootcamp.rockpaperscissors;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;

public class RockPaperScissorsResultsActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_rock_paper_scissors_results);
    }
}

Answer 1

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:id="@+id/main_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Please select an option! "
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.063" />

    <Button
        android:id="@+id/btn_Rock"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Rock"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.504"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.286" />

    <Button
        android:id="@+id/btn_Paper"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Paper"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.501"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.56" />

    <Button
        android:id="@+id/btn_Scissors"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Scissors"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.503"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.77" />

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    private String userKey = "USER_CHOICE";
    private String userChoice;

    private Button btn_Rock, btn_Paper, btn_Scissors;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initViews();
    }

    private void initViews()
    {
        btn_Rock = (Button) findViewById(R.id.btn_Rock);
        btn_Paper = (Button) findViewById(R.id.btn_Paper);
        btn_Scissors = (Button) findViewById(R.id.btn_Scissors);

        btn_Rock.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                userChoice = "ROCK";
                Intent rpsIntent = new Intent(MainActivity.this, RockPaperScissorsResultsActivity.class);
                rpsIntent.putExtra(userKey, userChoice);
                startActivity(rpsIntent);
                finish();
            }
        });

        btn_Paper.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                userChoice = "PAPER";
                Intent rpsIntent = new Intent(MainActivity.this, RockPaperScissorsResultsActivity.class);
                rpsIntent.putExtra(userKey, userChoice);
                startActivity(rpsIntent);
                finish();
            }
        });

        btn_Scissors.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                userChoice = "SCISSORS";
                Intent rpsIntent = new Intent(MainActivity.this, RockPaperScissorsResultsActivity.class);
                rpsIntent.putExtra(userKey, userChoice);
                startActivity(rpsIntent);
                finish();
            }
        });
    }
}

activity_rock_paper_scissors_results.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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=".RockPaperScissorsResultsActivity">

    <TextView
        android:id="@+id/playerChoice"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Player Choice"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.237" />

    <TextView
        android:id="@+id/computerChoice"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Computer Choice"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.383" />

    <TextView
        android:id="@+id/results"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Results"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.526" />

    <Button
        android:id="@+id/btn_PlayAgain"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Play Again"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.691" />
</androidx.constraintlayout.widget.ConstraintLayout>

RockPaperScissorsResultsActivity.java

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.util.Random;

public class RockPaperScissorsResultsActivity extends AppCompatActivity {

    private TextView playerChoice, computerChoice, results;
    private Button btn_PlayAgain;

    private static final String[] possibilities = new String[]{"ROCK", "PAPER", "SCISSORS"};
    private String userChoice, compChoice;
    private String userKey = "USER_CHOICE";
    private static final String USER_WINS = "User Wins";
    private static final String COMPUTER_WINS = "Computer Wins";
    private static final String MATCH_DRAW = "Match Draw";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_rock_paper_scissors_results);

        initViews();
    }

    private void initViews()
    {
        playerChoice = (TextView) findViewById(R.id.playerChoice);
        computerChoice = (TextView) findViewById(R.id.computerChoice);
        results = (TextView) findViewById(R.id.results);
        btn_PlayAgain = (Button) findViewById(R.id.btn_PlayAgain);

        // get the user choice from previous intent
        userChoice = getIntent().getStringExtra(userKey);

        // now get the computer choice
        compChoice = possibilities[randomNumberGenerator()];

        // set the user and computer choices to the textviews
        String playerChoiceString = "Player Choice: " + userChoice;
        String computerChoiceString = "Computer Choice: " + compChoice;
        playerChoice.setText(playerChoiceString);
        computerChoice.setText(computerChoiceString);

        // now determine the result and display
        String resultString = determineResult(userChoice, compChoice);
        results.setText(resultString);

        // action listener for play again button
        btn_PlayAgain.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(RockPaperScissorsResultsActivity.this, MainActivity.class));
                finish();
            }
        });
    }

    private String determineResult(String userChoice, String compChoice)
    {
        String res = "";

        if(userChoice.equalsIgnoreCase("ROCK"))
        {
            if(compChoice.equalsIgnoreCase("PAPER"))
                res = COMPUTER_WINS;
            else if(compChoice.equalsIgnoreCase("SCISSORS"))
                res = USER_WINS;
            else
                res = MATCH_DRAW;
        }
        else if(userChoice.equalsIgnoreCase("PAPER"))
        {
            if(compChoice.equalsIgnoreCase("ROCK"))
                res = USER_WINS;
            else if(compChoice.equalsIgnoreCase("PAPER"))
                res = MATCH_DRAW;
            else
                res = COMPUTER_WINS;
        }
        else if(userChoice.equalsIgnoreCase("SCISSORS"))
        {
            if(compChoice.equalsIgnoreCase("ROCK"))
                res = COMPUTER_WINS;
            else if(compChoice.equalsIgnoreCase("PAPER"))
                res = COMPUTER_WINS;
            else
                res = MATCH_DRAW;
        }

        return res;
    }

    private int randomNumberGenerator()
    {
        Random random = new Random();
        int num = 1 + random.nextInt(3 - 1);
        return num;
    }
}

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