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MihaiCristianCondreaMihaiCristianCondrea
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Add quiz module with questions
1 parent 11111fb commit 4dcb334

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8 files changed

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‎app/src/main/AndroidManifest.xml

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android:exported="false"
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android:label="@string/navigation_drawer"
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android:parentActivityName=".ui.screens.android.lessons.navigation.drawer.NavigationDrawerActivity" />
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<activity
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android:name=".ui.screens.quiz.QuizActivity"
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android:exported="false"
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android:label="@string/quiz_title"
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android:parentActivityName=".ui.screens.quiz.QuizActivity" />
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<service
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android:name="androidx.appcompat.app.AppLocalesMetadataHolderService"

‎app/src/main/assets/quiz_questions.json

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[
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{
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"question": "What language is primarily used for Android app development?",
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"options": ["Python", "Java", "Swift", "Ruby"],
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"answer": 1
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},
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{
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"question": "Which file declares your app's activities?",
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"options": ["build.gradle", "AndroidManifest.xml", "strings.xml", "MainActivity.java"],
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"answer": 1
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}
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]

‎app/src/main/java/com/d4rk/androidtutorials/java/data/model/QuizQuestion.java

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package com.d4rk.androidtutorials.java.data.model;
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/**
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* Model representing a multiple-choice quiz question.
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*/
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public record QuizQuestion(
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String question,
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String[] options,
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int answerIndex
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) {}

‎app/src/main/java/com/d4rk/androidtutorials/java/ui/screens/quiz/QuizActivity.java

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package com.d4rk.androidtutorials.java.ui.screens.quiz;
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import android.os.Bundle;
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import android.view.MenuItem;
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import androidx.annotation.NonNull;
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import androidx.appcompat.app.ActionBar;
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import androidx.appcompat.app.AppCompatActivity;
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import androidx.lifecycle.ViewModelProvider;
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import com.d4rk.androidtutorials.java.R;
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import com.d4rk.androidtutorials.java.data.model.QuizQuestion;
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import com.d4rk.androidtutorials.java.databinding.ActivityQuizBinding;
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import com.d4rk.androidtutorials.java.utils.EdgeToEdgeDelegate;
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import com.google.android.material.dialog.MaterialAlertDialogBuilder;
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/**
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* Activity that displays a simple multiple-choice quiz.
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*/
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public class QuizActivity extends AppCompatActivity {
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private ActivityQuizBinding binding;
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private QuizViewModel viewModel;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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binding = ActivityQuizBinding.inflate(getLayoutInflater());
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setContentView(binding.getRoot());
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EdgeToEdgeDelegate edgeToEdgeDelegate = new EdgeToEdgeDelegate(this);
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edgeToEdgeDelegate.applyEdgeToEdge(binding.container);
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ActionBar actionBar = getSupportActionBar();
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if (actionBar != null) {
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actionBar.setDisplayHomeAsUpEnabled(true);
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}
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viewModel = new ViewModelProvider(this).get(QuizViewModel.class);
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showQuestion(viewModel.getCurrentQuestion());
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binding.buttonNext.setOnClickListener(v -> onNextClicked());
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}
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private void onNextClicked() {
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int selectedId = binding.optionsGroup.getCheckedRadioButtonId();
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int selectedIndex = -1;
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if (selectedId == binding.option1.getId()) {
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selectedIndex = 0;
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} else if (selectedId == binding.option2.getId()) {
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selectedIndex = 1;
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} else if (selectedId == binding.option3.getId()) {
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selectedIndex = 2;
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} else if (selectedId == binding.option4.getId()) {
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selectedIndex = 3;
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}
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if (selectedIndex != -1) {
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viewModel.answer(selectedIndex);
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}
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if (viewModel.getCurrentIndex().getValue() >= viewModel.getTotalQuestions()) {
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showResult();
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} else {
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showQuestion(viewModel.getCurrentQuestion());
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binding.optionsGroup.clearCheck();
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}
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}
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private void showQuestion(QuizQuestion question) {
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if (question == null) {
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return;
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}
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binding.textQuestion.setText(question.question());
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binding.option1.setText(question.options()[0]);
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binding.option2.setText(question.options()[1]);
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binding.option3.setText(question.options()[2]);
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binding.option4.setText(question.options()[3]);
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}
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private void showResult() {
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int score = viewModel.getScore().getValue();
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int total = viewModel.getTotalQuestions();
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new MaterialAlertDialogBuilder(this)
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.setMessage(getString(R.string.quiz_finished, score, total))
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.setPositiveButton(android.R.string.ok, (d, w) -> finish())
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.setCancelable(false)
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.show();
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}
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@Override
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public boolean onOptionsItemSelected(@NonNull MenuItem item) {
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if (item.getItemId() == android.R.id.home) {
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finish();
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return true;
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}
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return super.onOptionsItemSelected(item);
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}
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}

‎app/src/main/java/com/d4rk/androidtutorials/java/ui/screens/quiz/QuizViewModel.java

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package com.d4rk.androidtutorials.java.ui.screens.quiz;
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import android.app.Application;
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import androidx.annotation.NonNull;
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import androidx.lifecycle.AndroidViewModel;
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import androidx.lifecycle.LiveData;
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import androidx.lifecycle.MutableLiveData;
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import com.d4rk.androidtutorials.java.data.model.QuizQuestion;
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import com.d4rk.androidtutorials.java.ui.screens.quiz.repository.QuizRepository;
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import java.util.List;
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/**
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* ViewModel managing quiz state and scoring.
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*/
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public class QuizViewModel extends AndroidViewModel {
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private final List<QuizQuestion> questions;
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private final MutableLiveData<Integer> currentIndex = new MutableLiveData<>(0);
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private final MutableLiveData<Integer> score = new MutableLiveData<>(0);
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public QuizViewModel(@NonNull Application application) {
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super(application);
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QuizRepository repository = new QuizRepository(application);
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questions = repository.loadQuestions();
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}
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public QuizQuestion getCurrentQuestion() {
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if (questions.isEmpty()) return null;
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int index = currentIndex.getValue();
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return questions.get(Math.min(index, questions.size() - 1));
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}
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public LiveData<Integer> getCurrentIndex() {
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return currentIndex;
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}
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public LiveData<Integer> getScore() {
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return score;
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}
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public void answer(int optionIndex) {
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QuizQuestion question = getCurrentQuestion();
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if (question != null && optionIndex == question.answerIndex()) {
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score.setValue(score.getValue() + 1);
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}
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currentIndex.setValue(currentIndex.getValue() + 1);
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}
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public int getTotalQuestions() {
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return questions.size();
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}
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}

‎app/src/main/java/com/d4rk/androidtutorials/java/ui/screens/quiz/repository/QuizRepository.java

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package com.d4rk.androidtutorials.java.ui.screens.quiz.repository;
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import android.content.Context;
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import com.d4rk.androidtutorials.java.data.model.QuizQuestion;
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import org.json.JSONArray;
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import org.json.JSONException;
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import org.json.JSONObject;
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import java.io.IOException;
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import java.io.InputStream;
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import java.nio.charset.StandardCharsets;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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/**
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* Repository responsible for loading quiz question data from JSON assets.
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*/
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public class QuizRepository {
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private final Context context;
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public QuizRepository(Context context) {
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this.context = context.getApplicationContext();
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}
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/**
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* Loads the quiz questions from the assets folder.
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*/
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public List<QuizQuestion> loadQuestions() {
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try {
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InputStream is = context.getAssets().open("quiz_questions.json");
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byte[] buffer = new byte[is.available()];
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int read = is.read(buffer);
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is.close();
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String json = new String(buffer, 0, read, StandardCharsets.UTF_8);
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JSONArray array = new JSONArray(json);
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List<QuizQuestion> result = new ArrayList<>();
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for (int i = 0; i < array.length(); i++) {
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JSONObject obj = array.getJSONObject(i);
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String question = obj.getString("question");
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JSONArray opts = obj.getJSONArray("options");
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String[] options = new String[opts.length()];
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for (int j = 0; j < opts.length(); j++) {
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options[j] = opts.getString(j);
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}
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int answer = obj.getInt("answer");
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result.add(new QuizQuestion(question, options, answer));
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}
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return result;
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} catch (IOException | JSONException e) {
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return Collections.emptyList();
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}
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}
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}

‎app/src/main/res/layout/activity_quiz.xml

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<?xml version="1.0" encoding="utf-8"?>
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<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:app="http://schemas.android.com/apk/res-auto"
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android:id="@+id/container"
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android:layout_width="match_parent"
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android:layout_height="match_parent">
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<TextView
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android:id="@+id/text_question"
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android:layout_width="0dp"
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android:layout_height="wrap_content"
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android:padding="16dp"
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android:textAppearance="@style/TextAppearance.Material3.TitleMedium"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toTopOf="parent" />
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<RadioGroup
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android:id="@+id/options_group"
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android:layout_width="0dp"
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android:layout_height="wrap_content"
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android:orientation="vertical"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toBottomOf="@id/text_question">
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<RadioButton
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android:id="@+id/option1"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="Option 1" />
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<RadioButton
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android:id="@+id/option2"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="Option 2" />
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<RadioButton
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android:id="@+id/option3"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="Option 3" />
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<RadioButton
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android:id="@+id/option4"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="Option 4" />
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</RadioGroup>
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<com.google.android.material.button.MaterialButton
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android:id="@+id/button_next"
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style="@style/Widget.Material3.Button"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_marginTop="16dp"
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android:text="@string/next_question"
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app:layout_constraintBottom_toBottomOf="parent"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toBottomOf="@id/options_group" />
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</androidx.constraintlayout.widget.ConstraintLayout>

‎app/src/main/res/values/strings.xml

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<string name="daily_tip_unit_tests">Write unit tests with JUnit and Espresso.</string>
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<string name="daily_tip_mvvm">Follow the MVVM architecture for maintainable code.</string>
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<string name="tip_of_the_day">Tip of the Day</string>
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<string name="quiz_title">Quiz</string>
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<string name="next_question">Next Question</string>
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<string name="quiz_finished">Quiz complete! Your score: %1$d/%2$d</string>
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<string name="other_apps_title">More apps by the developer</string>
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</resources>

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