Reimplementing Android Quiz App (UPDATE: Play Quiz)

Repository

https://github.com/pars11/AndroidQuizApp

What is the project about?

Android Quiz App is an quiz game for android. Dynamically as many categories and questions can be added, updated and deleted as desired. It currently uses Sqlite as the database.
When the game starts, the category selection screen appears. A new game is started with the questions in the category selected here. In each game questions are randomly brought.
When the game is over, a screen appears telling you how many questions you have made correctly and incorrectly and your score.

History

• Reimplementing Android Quiz App

New Features

Play Quiz

• An XML layout play_quiz_layout.xmlwas designed with radio buttons to allow users select only one answer from multi-choice answers in a question.
• An adapter class PlayQuizAdapter.java has the logic underlying the radio group. In this class, the option values of radio button are displayed with the help of the adapter class.
  The following code snippet describes the whole logic of how the score was calculated.

holder.radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                radioButton = group.findViewById(checkedId);
                String radioValue = radioButton.getText().toString().toLowerCase();
                /* This sets each default value in the array e.g [0,0,0,0]
                to 1 when a radiobutton is clicked
                */
                answersQuestions.set(position, 1);
                //This compares the answer from radiobutton with the answer in the database
                if (radioValue.equals(data.getAnswerOoption())) {
                    if (selectedIds.get(position) != null){
                        if (!selectedIds.get(position).isCorrect){
                            correctScore += 1;
                            selectedIds.get(position).isCorrect = true;
                        }
                    } else {
                        AnswerModel model = new AnswerModel();
                        model.isCorrect = true;
                        model.id = group.getId();
                        selectedIds.set(position, model);
                        correctScore += 1;
                    }
                } else {
                    if (selectedIds.get(position) != null){
                        if (selectedIds.get(position).isCorrect){
                            correctScore -= 1;
                            selectedIds.get(position).isCorrect = false;
                        }
                    } else {
                        AnswerModel model = new AnswerModel();
                        model.isCorrect = false;
                        model.id = group.getId();
                        selectedIds.set(position, model);
                    }
                }
            }
        });
    @Override
    public int getItemCount() {
        return questionList.size();
    }
    public int getCorrectScore() {
        return correctScore;
    }
    public int getIncorrectScore() {
        incorrectScore = questionList.size() - correctScore;
        return incorrectScore;
    }
    void setValues(List<Question> values) {
        questionList = values;
        /**
         * This gets the questions list size
         * and generates a default array of integer
         */
        int[] defaultValues = new int[questionList.size()];
        for (int value : defaultValues) {
            answersQuestions.add(value);
        }
        /**
         * This generates a default array of AnswerModel with size() == questionList.size()
         */
        for(int i = 0; i < questionList.size(); i++){
            selectedIds.add(null);
        }
        notifyDataSetChanged();
    }

• In the PlayQuizFragment.java class, this has a Submit button clicked to submit quiz and view score using a customized alert dialog. Also, the customized alert dialog has options of exiting the quiz or playing the game again.
  The following code snippet shows the implementation:

@Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        category = getActivity().getIntent().getExtras().getString("category");
        fab = getActivity().findViewById(R.id.fab);
        submitButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //This checks the array of set integer if it contains 0
                // e.g 0 means radiobutton(option) not selected
                boolean isAllQuestionsAnswered = playQuizAdapter.answersQuestions.contains(0);
                if (isAllQuestionsAnswered) {
                    Toast.makeText(getContext(), "You cannot leave any blank question", Toast.LENGTH_SHORT).show();
                } else {
                    mPresenter.calculateScore();
                }
            }
        });
    }
    @Override
    public void showQuestions(List<Question> questions) {
        if (questions.isEmpty()) {
            showEmptyMessage();
            fab.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Intent intent = new Intent(getContext(), AddQuestionActivity.class);
                    intent.putExtra("category", category);
                    startActivity(intent);
                }
            });
        } else {
            emptyTextView.setVisibility(View.GONE);
            fab.setVisibility(View.GONE);
            playQuizAdapter.setValues(questions);
        }
    }
    @Override
    public void showScore() {
        //Create an alert dialog builder
        AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
        //Set title value
        builder.setPositiveButton("Play Again", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                startActivity(getActivity().getIntent());
            }
        })
                .setNeutralButton("Exit", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        startActivity(new Intent(getContext(), CategoriesActivity.class));
                    }
                });
        //Get custom view
        LayoutInflater inflater = getActivity().getLayoutInflater();
        final View dialogView = inflater.inflate(R.layout.score_dialog, null);
        builder.setView(dialogView);
        final TextView correctView = dialogView.findViewById(R.id.correct);
        final TextView incorrectView = dialogView.findViewById(R.id.incorrect);
        correctView.setText(String.format(Locale.ENGLISH, "%s: %d", "Correct", playQuizAdapter.getCorrectScore()));
        incorrectView.setText(String.format(Locale.ENGLISH, "%s: %d", "Incorrect", playQuizAdapter.getIncorrectScore()));
        alertDialog = builder.create();
        alertDialog.show();
    }

Important Resources

• Pull Request
• Apk file
• Github Repo

Roadmap

• Play quiz per category and get result
• Show questions per category
• Update and delete category
• Update and delete question