OIBSIP — Android Development — Task 4

Quiz App

A multiple-choice General Knowledge quiz Android app with a per-question timer, instant feedback, and a final score screen.

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🎯 Objective

Build an Android quiz app that presents 15 multiple-choice general-knowledge questions, gives the user instant feedback on each answer, tracks the score, enforces a time limit per question, and shows a final result at the end.

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🛠 Tools Used

Tool / Library	Purpose
Android Studio	IDE
Java	Application logic
XML	UI layouts
Material Components 1.12.0	MaterialButton, LinearProgressIndicator, MaterialToolbar
AndroidX • CountDownTimer	Per-question 20-second timer
AGP 8.5.0 / Gradle 8.7 / JDK 17	Build toolchain
Min SDK 24 • Target SDK 34	API compatibility

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🔧 Steps Performed

1. Project setup — Empty Activity project (Java), Material 3 DayNight theme.
2. Activities — created 3 activities:
   • MainActivity (landing, Start Quiz button)
   • QuizActivity (the actual quiz loop)
   • ResultActivity (final score + retry / home)
3. Question model — Question POJO with text, String[] options, int correctIndex; a static bank() method returns 15 shuffled GK questions covering science, history, geography, languages, tech, art.
4. Quiz screen UI — counter (Question 3 / 15), LinearProgressIndicator for visual progress, the question text, dynamically generated outlined-button options, a feedback line, and a Next / Finish button.
5. Dynamic options — for each question, options are built at runtime as MaterialButton views inside a LinearLayout; each click calls onOptionSelected(idx, correctIndex, button).
6. Feedback rendering — on answer, the correct button turns green, the wrong one (if any) turns red, and a one-line feedback (✔ Correct! / ✘ Wrong answer / ⏱ Time's up) appears.
7. Timer — a CountDownTimer (20 s, tick every 250 ms) updates a tvTimer label; on timeout, the correct answer is auto-revealed and the question is locked.
8. Scoring — score++ only on a correct (non-timeout) answer; total questions and final score are passed via Intent extras to ResultActivity.
9. Result screen — emoji + message tiered by percentage: ≥80 % 🏆, ≥60 % 🎉, ≥40 % 🙂, else 📚; offers Try Again and Back to Home.
10. Polish — Day/Night theming, single-line truncation safe, no crashes if the user spam-taps an option (answered guard).

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✅ Outcome

A complete quiz app featuring:

• 15-question built-in GK bank (shuffled each play)
• 4 multiple-choice options per question
• 20-second timer per question with live countdown
• Instant green/red feedback + correct-answer reveal on time-out
• Progress bar showing position in the quiz
• Final score screen with retry & home actions
• Material 3 + Day/Night auto theme
• No network calls — fully offline

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📂 Project Structure

java/com/intern/quizapp/
├── MainActivity.java        # landing screen
├── Question.java            # POJO + static 15-Q bank
├── QuizActivity.java        # quiz loop, timer, scoring
└── ResultActivity.java      # final score + retry

res/layout/
├── activity_main.xml        # start screen
├── activity_quiz.xml        # question + options + timer + progress
└── activity_result.xml      # emoji + score + actions