5-2

MainActivity.java

    public void showNextQuiz() {
        // 省略
    }

    public void checkAnswer(View view) {
      
        // どの回答ボタンが押されたか
        Button answerBtn = findViewById(view.getId());
        String btnText = answerBtn.getText().toString();

        String alertTitle;
        if (btnText.equals(rightAnswer)) {
            alertTitle = "正解!";
            rightAnswerCount++;
        } else {
            alertTitle = "不正解...";
        }

        // ダイアログを作成
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle(alertTitle);
        builder.setMessage("答え : " + rightAnswer);
        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                if (quizCount == QUIZ_COUNT) {
                    // 結果画面へ移動
                } else {
                    quizCount++;
                    showNextQuiz();
                }
            }
        });
        builder.setCancelable(false);
        builder.show();
    }

}