If conditions for the quiz app android

Want to implement if conditions for WRONG,CORRECT and UNANSWERED QUESTIONS which will display correct,wrong and score at last.App runs but its not showing the correct score for it.

Want to implement below format in quiz-

if(wrong_Click_radioButton)
    {
    wrong++;
    nextquestion++;
    }
    if(correct_Click_radioButton)
    {
    correct++;
    nextquestion++;
    }
    if(not_clicked_any_radioButton)
    {
    nextquestion++;
    }
    if(last_question_checking)
    {
    score display;
    switch to next android activity;
    }

The code which if implemented shows wrong logic

if (userSelection == -1) {

                    Toast.makeText(QuizActivity.this, "You Left the Questions-->" + radioGroup.getCheckedRadioButtonId() + "score-->" + score, Toast.LENGTH_LONG).show();

                } else if (userSelection == correctAnswerForQuestion) {
                    correct++;
                    // correct answer
                    Toast.makeText(QuizActivity.this, "Correct Answer" + "Correct-" + correct + "Wrong" + wrong, Toast.LENGTH_LONG).show();


                } else {
                    wrong++;
                    // failed question
                    Toast.makeText(QuizActivity.this, "Wrong Answer" + "Correct-" + correct + "Wrong" + wrong, Toast.LENGTH_LONG).show();
                    return;

                }
                currentQuizQuestion++;

                if (currentQuizQuestion >= quizCount) {
                    score = correct - wrong;
                    Toast.makeText(QuizActivity.this, "End of the Quiz Questions" + score, Toast.LENGTH_LONG).show();

                } else {
                    firstQuestion = parsedObject.get(currentQuizQuestion);
                    quizQuestion.setText(firstQuestion.getQuestion());
                    String[] possibleAnswers = firstQuestion.getAnswers().split(",");
                    uncheckedRadioButton();
                    optionOne.setText(possibleAnswers[0]);
                    optionTwo.setText(possibleAnswers[1]);
                    optionThree.setText(possibleAnswers[2]);
                    optionFour.setText(possibleAnswers[3]);
                    return;
                }
            }

        });