java - 计时器类不重新启动计时器 - Android

Question

我有一个包含 10 个问题的问答游戏，每个问题都有 10 秒的计时器。当计时器用完时，问题变为下一个，但计时器永远不会重新启动。它保持在 0。当显示下一个问题时，我似乎无法在代码中找到阻止计时器重新启动的位置。

此外，感谢代码结构建议！

先感谢您。

QuestionView.java

public class QuestionView extends Activity  {

    int correctAnswers = 0;
    int wrongAnswers = 0;
    int answer = 0;
    int i = 0;

    long score = 0;

    long startTime = 10000;
    long interval = 1000;
    long timeElapsed;

    boolean timerHasStarted = false;

    String category;

    Button answer1, answer2, answer3, answer4;
    TextView question, timer, timeElapsedView;

    ArrayList<Question> queries;
    Timer cdTimer;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.questionviewmain);

        answer1 = (Button)findViewById(R.id.answer1);
        answer2 = (Button)findViewById(R.id.answer2);
        answer3 = (Button)findViewById(R.id.answer3);
        answer4 = (Button)findViewById(R.id.answer4);

        question = (TextView)findViewById(R.id.question);

        category = getIntent().getStringExtra("category");
        queries = getIntent().getParcelableArrayListExtra("queries");

        timer = (TextView)findViewById(R.id.timer);
        timeElapsedView = (TextView)findViewById(R.id.timeElapsedView);

        cdTimer = new Timer(startTime, interval);

              loadQuestion();
    }

    public void loadQuestion() {
        if(i == 9) {
            endQuiz();
        } else {
            if(!timerHasStarted) {
                cdTimer.start();
                timerHasStarted = true;
            } else {
                cdTimer.cancel();
                timerHasStarted = false;
            }

            answer = queries.get(i).getCorrectAnswer();
            question.setText(queries.get(i).getQuery());

            answer1.setText(queries.get(i).getA1());
            answer2.setText(queries.get(i).getA2());
            answer3.setText(queries.get(i).getA3());
            answer4.setText(queries.get(i).getA4());

            answer1.setOnClickListener(new OnClickListener() {
                public void onClick(View arg0) {
                    queries.get(i).setSelectedAnswer(0);
                    if(answer == 0) {
                        correctAnswers++;
                        nextQuestion();
                    } else {
                        wrongAnswers++;
                        nextQuestion();
                    }
                }
            });

            //Same code for button 1 for buttons 2 through 4.
        } 
    }

    public void nextQuestion() {
        score = score + ((startTime / 100) - timeElapsed);
        i++;
        loadQuestion();
    }

    public class Timer extends CountDownTimer {

        public Timer(long startTime, long interval) {
            super(startTime, interval);
        }

        @Override
        public void onFinish() {
            if(i == 9) {
                cdTimer.cancel();
            } else {
                wrongAnswers++;
                nextQuestion();
            }
        }

        @Override
        public void onTick(long millisUntilFinished) {
            timer.setText("Time remaining: " + (millisUntilFinished / 100));
            timeElapsed = 100 - ((startTime - millisUntilFinished) / 100);
            timeElapsedView.setText("Points remaining: " + timeElapsed);
        }
    }

    public void endQuiz() {
        Intent intent = new Intent(QuestionView.this, Results.class);
        intent.putExtra("correctAnswers", correctAnswers);
        intent.putExtra("wrongAnswers", wrongAnswers);
        intent.putExtra("score", score);
        intent.putParcelableArrayListExtra("queries", queries);
        intent.putExtra("category", category);
        startActivity(intent);
    }
}

Answer 1

尝试以下方法，看看是否有帮助。cancel()此外，不需要在计时器自己的方法内部调用，onFinish()因为计时器已经被取消以到达该方法。

public void loadQuestion() {
        if(i == 9) {
            endQuiz();
        } else {
            cdTimer.start(); //start timer here
            answer = queries.get(i).getCorrectAnswer();
            question.setText(queries.get(i).getQuery());

            answer1.setText(queries.get(i).getA1());
            answer2.setText(queries.get(i).getA2());
            answer3.setText(queries.get(i).getA3());
            answer4.setText(queries.get(i).getA4());

            answer1.setOnClickListener(new OnClickListener() {
                public void onClick(View arg0) {

                    cdTimer.cancel(); // end it when clicked.
                    queries.get(i).setSelectedAnswer(0);
                    if(answer == 0) {
                        correctAnswers++;
                        nextQuestion();
                    } else {
                        wrongAnswers++;
                        nextQuestion();
                    }
                }
            });

            //Same code for button 1 for buttons 2 through 4.
        } 
    }