Android Countdowntimer问题

Question

我的倒数计时器出了问题。 我的应用程序有一个textview说＆＃34;点击开始＆＃34;然后倒计时从3开始。我的问题是当我设置textview visibility（View.GONE）倒计时从2开始如果我删除了我设置可见性的行，倒计时工作正常（从3开始）但当然textview仍然可见 我在倒计时使用750而不是1000，因为1000倒计时总是从2开始 为什么会这样？我该如何解决这个问题？

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:textSize="60sp"
    android:text="Tap to start"
    android:id="@+id/starttext"
    android:layout_centerVertical="true"
    android:layout_centerHorizontal="true"/>



public void countdowntostart(){
    TextView timetostart = (TextView) findViewById(R.id.starttext);
    timetostart.setVisibility(View.GONE);

    CountDownTimer countDownTimer = new CountDownTimer(3000, 750) {
    TextView timestart = (TextView) findViewById(R.id.playtimetext);


    public void onTick(long millisUntilFinished) {
        timestart.setText("" + millisUntilFinished/1000);
    }

    public void onFinish() {
      abcuu();
    }
}.start();

}

Answer 1

TextView的文本显示2是因为系统在运行onTick()方法之前已经计算了一秒，因此即使文本视图是3秒倒计时仍然是准确的倒计时开始时显示2。如果您希望在TextView上显示倒计时值，可以在倒计时前将初始倒计时值设置为TextView。

Answer 2

可能是因为您没有给它特定的舍入。试试Math.ceil((double) millisecondsUntilFinished / 1000);

如果这不起作用，您也可以尝试将timerstart文字设置为＆＃34; 3＆＃34;当你启动计时器。否则，我创建了一个CustomCountdownTimer类，它也有onStarted，onPaused等的抽象方法。

public abstract class CustomCountdownTimer {

    private long millisInFuture;
    private long countDownInterval;

    private int secondsRemaining;

    private boolean started;
    private boolean paused;

    public enum State {
        RUNNING,
        PAUSED,
        STOPPED,
        RESUMED,
        STARTED,
        FINISHED,
        STATUS
    }

    public CustomCountdownTimer(long millisInFuture, long countDownInterval) {
        this.millisInFuture = millisInFuture;
        this.countDownInterval = countDownInterval;

        started = false;
        paused = false;

        initialize();
    }

    public boolean isPaused(){
        return paused && isStarted();
    }

    public boolean isStarted(){
        return started;
    }

    public void pause() {
        paused = true;
        timerPaused(secondsRemaining);
    }

    public void resume(){
        paused = false;
        timerResumed(secondsRemaining);
    }

    public CustomCountdownTimer start() {
        started = true;
        return this;
    }

    public void stop() {
        millisInFuture = 0;
    }

    public void initialize() {
        final Handler handler = new Handler();
        Log.v("status", "starting");
        final Runnable counter = new Runnable(){

            public void run(){
                long sec = millisInFuture / 1000;

                if(started && !paused) {
                    if(millisInFuture <= 0) {
                        Log.v("status", "done");

                        started = false;
                        onFinish();
                    } else {
                        Log.v("status", Long.toString(sec) + " seconds remain");
                        millisInFuture -= countDownInterval;
                        secondsRemaining = (int) Math.ceil(((double) millisInFuture / 1000));

                        handler.postDelayed(this, countDownInterval);
                        onTick(secondsRemaining);
                    }
                } else {
                    Log.v("status", Long.toString(sec) + " seconds remain and timer has stopped!");
                    handler.postDelayed(this, countDownInterval);
                }
            }
        };

        handler.postDelayed(counter, countDownInterval);
    }

    public void updateTimer(long millisInFuture){
        this.millisInFuture = millisInFuture;
    }

    public abstract void onTick(int secondsRemaining);
    public abstract void onFinish();
    public abstract void timerPaused(int secondsRemaining);
    public abstract void timerResumed(int secondsRemaining);

}

像这样使用：

CustomCountdownTimer customCountdownTimer = new CustomCountdownTimer(totalSeconds * 1000, 1000) {
    @Override
    public void onTick(int remainingSeconds) {
        // Code on each tick
    }

    @Override
    public void onFinish() {
        // Code to run when finished
    }

    @Override
    public void timerPaused(int remainingSeconds) {
        // Code to run if paused
    }

    @Override
    public void timerResumed(int remainingSeconds) {
        // Code to run when resumed from paused
    }
};

customCountdownTimer.start();

请注意，这是使用完整秒而不是毫秒，并且它会在您启动时显示3而不是2，因为它会像我之前建议的那样向上舍入。