Quiz App

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=".MainActivity"
    android:orientation="vertical">

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:src="@drawable/kentecloth"
        android:layout_weight="1"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Test Your Knowledge of the Kente Stole"
        android:textSize="24sp"
        android:gravity="center"
        android:textStyle="bold"
        android:textColor="@android:color/black"/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <EditText
            android:id="@+id/playerInput"
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            android:inputType="text"
            android:hint="Player Name"
            android:layout_weight="3"/>

        <Button
            android:id="@+id/submitButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Submit"
            android:onClick="submitPlayer"/>

    </LinearLayout>

    <TextView
        android:id="@+id/question"
        android:padding="8dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="24sp"
        android:text=""
        android:textColor="@android:color/black"/>

    <CheckBox
       android:id="@+id/checkYes"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:text="Yes"
       android:visibility="gone"
        android:onClick="onCheck"/>

    <CheckBox
        android:id="@+id/checkNo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="No"
        android:visibility="gone"
        android:onClick="onCheck"/>

    <RadioGroup
        android:id="@+id/all_radio_buttons"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:padding="16dp"
        android:visibility="gone"
        >
        <RadioButton
            android:id="@+id/black_radio_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Black"
            android:textAppearance="?android:textAppearanceMedium"
            android:onClick="answerQuestion"/>
        <RadioButton
            android:id="@+id/gold_radio_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Gold"
            android:textAppearance="?android:textAppearanceMedium"
            android:onClick="answerQuestion"/>
        <RadioButton
            android:id="@+id/white_radio_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="White"
            android:textAppearance="?android:textAppearanceMedium"
            android:onClick="answerQuestion"/>
        <RadioButton
            android:id="@+id/red_radio_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Red"
            android:textAppearance="?android:textAppearanceMedium"
            android:onClick="answerQuestion"/>
        <RadioButton
            android:id="@+id/green_radio_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Green"
            android:textAppearance="?android:textAppearanceMedium"
            android:onClick="answerQuestion"/>
    </RadioGroup>

    <TextView
        android:id="@+id/results"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text=""
        android:textSize="32sp"/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/scoreTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:visibility="gone"
            android:padding="8dp"
            android:textSize="32sp"
            android:layout_weight="3"/>

        <Button
            android:id="@+id/scoreButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Score"
            android:visibility="gone"
            android:onClick="showScore"/>

        <Button
            android:id="@+id/resetButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Reset"
            android:visibility="gone"
            android:onClick="reset"/>
    </LinearLayout>
</LinearLayout>

Mainactivity.java

package com.shamikalashawn.quizapp;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

import java.util.*;
import java.util.Random;


public class MainActivity extends AppCompatActivity {
    Integer questionNumber = 0;
    Integer score = 0;
    Integer numberOfQuestions = 0;
    ArrayList usedQuestions = new ArrayList();
    HashMap questions = new HashMap();
    HashMap answers = new HashMap();
    RadioGroup radioAnswers;
    TextView questionTextView;
    TextView resultsTextView;
    RadioButton black;
    RadioButton red;
    RadioButton white;
    RadioButton gold;
    RadioButton green;
    RadioGroup all;
    CheckBox yes;
    CheckBox no;
    Button resetButton;
    String player;
    EditText playerName;
    Button submitButton;
    TextView scoreTextView;
    Button scoreButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        //populate list of questions
        questions.put(1, "Which color represents posterity?");
        questions.put(2, "Which color represents maturity?");
        questions.put(3, "Which color represents pureness?");
        questions.put(4, "Which color represents mourning?");
        questions.put(5, "Which color represents spiritual growth?");

        numberOfQuestions = questions.size();

        //set answers
        answers.put("Which color represents posterity?", "Gold");
        answers.put("Which color represents maturity?", "Black");
        answers.put("Which color represents pureness?", "White");
        answers.put("Which color represents mourning?", "Red");
        answers.put("Which color represents spiritual growth?", "Green");


        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        radioAnswers = (RadioGroup) findViewById(R.id.all_radio_buttons);
        questionTextView = (TextView) findViewById(R.id.question);
        resultsTextView = (TextView) findViewById(R.id.results);
        black = findViewById(R.id.black_radio_button);
        red = findViewById(R.id.red_radio_button);
        white = findViewById(R.id.white_radio_button);
        gold = findViewById(R.id.gold_radio_button);
        green = findViewById(R.id.green_radio_button);
        all = findViewById(R.id.all_radio_buttons);
        yes = (CheckBox) findViewById(R.id.checkYes);
        no = (CheckBox) findViewById(R.id.checkNo);
        resetButton = (Button) findViewById(R.id.resetButton);
        playerName = (EditText) findViewById(R.id.playerInput);
        submitButton = (Button) findViewById(R.id.submitButton);
        scoreTextView = findViewById(R.id.scoreTextView);
        scoreButton = (Button) findViewById(R.id.scoreButton);
    }

    /**
     * When radio button is clicked, this method checks the answer, updates the score, and displays a new question
     */
    public void answerQuestion(View view) {
        //capture correct answer for current question
        String currentQuestion = questions.get(questionNumber).toString();
        String correctAnswer = answers.get(currentQuestion).toString();


        if (black.isChecked() && correctAnswer == "Black") {
            score += 10;
            Toast.makeText(getApplicationContext(), "That's correct! You earned 10 points!!",
                    Toast.LENGTH_LONG).show();
        } else if (red.isChecked() && correctAnswer == "Red") {
            score += 10;
            Toast.makeText(getApplicationContext(), "That's correct! You earned 10 points!!",
                    Toast.LENGTH_LONG).show();
        } else if (white.isChecked() && correctAnswer == "White") {
            score += 10;
            Toast.makeText(getApplicationContext(), "That's correct! You earned 10 points!!",
                    Toast.LENGTH_LONG).show();
        } else if (gold.isChecked() && correctAnswer == "Gold") {
            score += 10;
            Toast.makeText(getApplicationContext(), "That's correct! You earned 10 points!!",
                    Toast.LENGTH_LONG).show();
        } else if (green.isChecked() && correctAnswer == "Green") {
            score += 10;
            Toast.makeText(getApplicationContext(), "That's correct! You earned 10 points!!",
                    Toast.LENGTH_LONG).show();
        } else {
            Toast.makeText(getApplicationContext(), "Sorry, that is incorrect. We were looking for " + correctAnswer + ".",
                    Toast.LENGTH_LONG).show();
        }

        //clear selection
        all.clearCheck();

        //update score
//        displayScore();

        //select a new question
        pickQuestion();
    }

    /**
     * This method displays the given text on the screen.
     */
    private void displayQuestion(String message) {
        questionTextView.setText(message);
    }

    /**
     * This method displays the given text on the screen.
     */
    private void displayResults(String message) {
        resultsTextView.setText(message);
    }

//    /**
//     * This method unchecks the radio button previously selected
//     */
//    private void uncheck(Integer buttonID) {
//        RadioButton selectedRadioButton = (RadioButton) findViewById(buttonID);
//        selectedRadioButton.toggle();
//    }

    /**
     * This method displays the score.
     */
    private void displayScore() {
        scoreTextView.setText(player + "'s Score: " + score);
    }

    /**
     * This method repopulates the hashMap of questions
     */
    public void reset(View view) {
        playerName.setText(null);
        usedQuestions = new ArrayList();
        score = 0;
        displayQuestion("");
        displayResults("");
        yes.setChecked(false);
        no.setChecked(false);
        no.setClickable(true);
        yes.setClickable(true);
        yes.setVisibility(View.GONE);
        no.setVisibility(View.GONE);
        resetButton.setVisibility(View.GONE);
        playerName.setVisibility(View.VISIBLE);
        player = "";
        scoreTextView.setVisibility(View.GONE);
        displayScore();
        submitButton.setVisibility(View.VISIBLE);

    }

    /**
     * This method picks a random question
     */
    public void pickQuestion() {
        Integer usedQuestionsLength = usedQuestions.size();

        Random rand = new Random();
        questionNumber = rand.nextInt(numberOfQuestions) + 1;


        //pick a random index and ensure it has not been used before
        while (usedQuestions.contains(questionNumber)) {
            if (usedQuestionsLength < numberOfQuestions) {
                questionNumber = rand.nextInt(numberOfQuestions) + 1;
            } else {
                radioAnswers.setVisibility(View.GONE);
                yes.setVisibility(View.VISIBLE);
                no.setVisibility(View.VISIBLE);
                displayQuestion("Did you enjoy playing?");
                displayResults("That's the game!");
                scoreButton.setVisibility(View.VISIBLE);
                return;
            }

        }

        //add random question number to used questions array
        usedQuestions.add(questionNumber);

        //display random question
        String randQuestion = questions.get(questionNumber).toString();
        displayQuestion(randQuestion);

    }

    /**
     * This method occurs after checkbox is selected
     */
    public void onCheck (View view){

        switch (view.getId()) {
            case R.id.checkNo:
                if(no.isChecked())
                    displayResults("Aww, that's too bad! Maybe playing again will help.");
                else
                    break;
            case R.id.checkYes:
                if(yes.isChecked())
                    displayResults("Sweet! Thanks for playing!");
                else
                    break;
        }
        resetButton.setVisibility(View.VISIBLE);
        no.setClickable(false);
        yes.setClickable(false);
    }

    /**
     * Method sets player name, makes question, radiogroup, and score visible
     */
    public void submitPlayer(View view){
        if (playerName.getText().toString().matches("")){
            Toast.makeText(getApplicationContext(), "Please enter a player name!",
                    Toast.LENGTH_LONG).show();
        }
        else{
            playerName.setVisibility(View.GONE);
            player = playerName.getText().toString();
            submitButton.setVisibility(View.GONE);
            pickQuestion();
            radioAnswers.setVisibility(View.VISIBLE);
        }

//        displayScore();
    }

    /**
     * Method shows score after all questions have been answered
     */
    public void showScore(View view){
        scoreTextView.setVisibility(View.VISIBLE);
        displayScore();
        scoreButton.setVisibility(View.GONE);
    }
}