java - 如何在 android studio CountdownTimer 中的另一个 CountdownTimer 中重新启动(两者都工作正常)

Question

我正在尝试制作一个问题游戏来提高我的技能。用户选择游戏时间(在本例中假设为 10 分钟)，对于每个问题，他们有 10 秒或其他时间来回答。两个计时器都工作正常，但是当 10 秒计数器到达终点时，如何重新启动并让位于下一个问题，直到 10 分钟计数器结束？

   private void startGameTimer(final TextView gameCountDown, final ArrayList<MusicSQLRow> arrayQuiz) {
// le agrego 2 segundos de delay para que le de tiempo al usuario de reaccionar


        new CountDownTimer(gameTime,1000){

            @Override
            public void onTick(long millisUntilFinished) {

            gameCountDown.setText("Time Remaining: "+String.format("%d min, %d sec",
                    TimeUnit.MILLISECONDS.toMinutes( millisUntilFinished),
                    TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) -
                            TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished))));

                 // the questions begin adjusted by the SharedPreferences answer time, se abre otro thread para manejar la pregunta
                this.askQuestion(arrayQuiz);

            }

            // handles just one question
            private void askQuestion(ArrayList<MusicSQLRow> arrayQuiz) {

                new CountDownTimer(answerTime,1000){


                    @Override
                    public void onTick(long millisUntilFinished) {

                        answerCountDown.setText("Next Question in: "+ TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) );


                    }

                    @Override
                    public void onFinish() {

                    }
                }.start();


            }

            @Override
            public void onFinish() {
               //unhide buttons to go back to main menu or to play again(reset the activity, check if there's no problem with shared preferences when the activitie reloads)
            }

        }.start();

    }

Answer 1

首先:尽量不要创建长时间运行的 CountDownTimer 的匿名实例，您将无法处置它们并且会泄漏整个 Activity 。最好的选择是创建包含这些计时器的单独的类文件。

CountDownTimer gameTimer, answerTimer;
boolean gameTimerIsRunning, answerTimerIsRunning;

public void startGame(){
    startGameTimer();
    startAnswerTimer();
}

public void startGameTimer(){
    gameTimer = new CountDownTimer(GAME_DURATION, TEXT_VIEW_UPDATE_RATE){

        @Override public void onTick(long millisUntilFinished) {
            updateGameTextView(millisUntilFinished);
        }

        @Override public void onFinish() {
            gameTimerIsRunning = false;
            if(answerTimerIsRunning) answerTimer.cancel(); 
            handleEndOfTheGame();
        }

    };
    gameTimerIsRunning = true;
    gameTimer.start();
}

public void startAnswerTimer(){
    if(answerTimer==null) {
        answerTimer = new CountDownTimer(TIME_FOR_AN_ANSWER, TEXT_VIEW_UPDATE_RATE) {

            @Override public void onTick(long millisUntilFinished) {
                updateAnswerTextView(millisUntilFinished);
            }

            @Override public void onFinish() {
                answerTimerIsRunning = false;

                if (gameTimerIsRunning) {
                    loadNewQuestion();
                    startAnswerTimer();
                }
        };
    }
    answerTimerIsRunning = true;
    answerTimer.start();
}

不要忘记在 Activity/fragment 的 onPause() 中调用 gameTimer.cancel() 和 answerTimer.cancel()。