如何转换此字符串"；03:34:21“；在Java中转换为秒

在我的应用程序中，我有一个计时器，每秒更新一个文本视图，格式如下：

00:00:00 - hours, minutes, seconds.

在onPause中，我将tvTimer的值作为字符串记录在SharedReference中，例如00:21:13（21分13秒）和onPause发生的时间

在onResume中，我获取这些值，并尝试将从现在到上一次onPause之间的时间添加到tvTimer字符串的值中，您可以在TODO中看到这一点，但我不知道如何做到这一点

private long startTime = 0L;
private Handler customHandler = new Handler();
long timeInMilliseconds = 0L;
long timeSwapBuff = 0L;
long updatedTime = 0L;

private void startTimer() {
    tvTimer.setVisibility(View.VISIBLE);
    tvTimer.setText(obtainTimerProgress());

    startTime = SystemClock.uptimeMillis();
    customHandler.postDelayed(updateTimerThread, 0);
}

private Runnable updateTimerThread = new Runnable() {

    public void run() {

        timeInMilliseconds = SystemClock.uptimeMillis() - startTime;

        updatedTime = timeSwapBuff + timeInMilliseconds;

        int secs = (int) (updatedTime / 1000);
        int mins = secs / 60;
        secs = secs % 60;

        int hours = mins / 60;

        tvTimer.setText(String.format("%02d", hours) + ":" + String.format("%02d", mins) + ":" + String.format("%02d", secs));
        customHandler.postDelayed(this, 0);
        // TODO Find a suitable moment to customHandler.removeCallbacks
    }

};

private String obtainTimerProgress() {
    SharedPreferences preferences = getActivity().getSharedPreferences(Constant.USER_PREFERENCES, Activity.MODE_PRIVATE);
    String timerProgress = preferences.getString(Constant.PROGRESS + getUserId(), "00:00:00");
    if (timerProgress != null && !timerProgress.contentEquals("") && !timerProgress.contentEquals("00:00:00")) {
        long timeOfTimerPause = preferences.getLong(Constant.TIME_OF_ON_PAUSE + getUserId(), 0);
        long now = new Date().getTime();
        long differenceBetweenThenAndNow = (now - timeOfTimerPause ) / 1000;
        // TODO Parse the string "00:43:34" and turn it into seconds, add differenceBetweenThenAndNow and format it as "00:53:22" again
    }
    return timerProgress;
}

public class HelloWorld{ public static void main(String []args){ String time = "1:02:59"; String timeSplit[] = time.split(":"); int seconds = Integer.parseInt(timeSplit[0]) * 60 * 60 + Integer.parseInt(timeSplit[1]) * 60 + Integer.parseInt(timeSplit[2]); System.out.println(seconds); } } 在onPause中，我将tvTimer的值作为字符串记录在SharedReference中，例如00:21:13（21分13秒）和onPause发生的时间

在onResume中，我获取这些值，并尝试将从现在到上一次onPause之间的时间添加到tvTimer字符串的值中，您可以在TODO中看到这一点，但我不知道如何做到这一点。

公共类HelloWorld{

private long startTime = 0L;
private Handler customHandler = new Handler();
long timeInMilliseconds = 0L;
long timeSwapBuff = 0L;
long updatedTime = 0L;

private void startTimer() {
    tvTimer.setVisibility(View.VISIBLE);
    tvTimer.setText(obtainTimerProgress());

    startTime = SystemClock.uptimeMillis();
    customHandler.postDelayed(updateTimerThread, 0);
}

private Runnable updateTimerThread = new Runnable() {

    public void run() {

        timeInMilliseconds = SystemClock.uptimeMillis() - startTime;

        updatedTime = timeSwapBuff + timeInMilliseconds;

        int secs = (int) (updatedTime / 1000);
        int mins = secs / 60;
        secs = secs % 60;

        int hours = mins / 60;

        tvTimer.setText(String.format("%02d", hours) + ":" + String.format("%02d", mins) + ":" + String.format("%02d", secs));
        customHandler.postDelayed(this, 0);
        // TODO Find a suitable moment to customHandler.removeCallbacks
    }

};

private String obtainTimerProgress() {
    SharedPreferences preferences = getActivity().getSharedPreferences(Constant.USER_PREFERENCES, Activity.MODE_PRIVATE);
    String timerProgress = preferences.getString(Constant.PROGRESS + getUserId(), "00:00:00");
    if (timerProgress != null && !timerProgress.contentEquals("") && !timerProgress.contentEquals("00:00:00")) {
        long timeOfTimerPause = preferences.getLong(Constant.TIME_OF_ON_PAUSE + getUserId(), 0);
        long now = new Date().getTime();
        long differenceBetweenThenAndNow = (now - timeOfTimerPause ) / 1000;
        // TODO Parse the string "00:43:34" and turn it into seconds, add differenceBetweenThenAndNow and format it as "00:53:22" again
    }
    return timerProgress;
}

public class HelloWorld{ public static void main(String []args){ String time = "1:02:59"; String timeSplit[] = time.split(":"); int seconds = Integer.parseInt(timeSplit[0]) * 60 * 60 + Integer.parseInt(timeSplit[1]) * 60 + Integer.parseInt(timeSplit[2]); System.out.println(seconds); } } 公共静态void main（字符串[]args）{ 字符串时间=“1:02:59”； 字符串timeSplit[]=time.split（“：”）； int seconds=Integer.parseInt（timeSplit[0]）*60*60+Integer.parseInt（timeSplit[1]）*60+Integer.parseInt（timeSplit[2]）； 系统输出打印项次（秒）； } } 使用：拆分字符串，然后获取每个值并转换为秒。我已经用粗体标出了这些行。希望这有帮助

公共类HelloWorld{ 公共静态void main（字符串[]args）{ 字符串时间=“1:02:59”； 字符串timeSplit[]=time.split（“：”）； int seconds=Integer.parseInt（timeSplit[0]）*60*60+Integer.parseInt（timeSplit[1]）*60+Integer.parseInt（timeSplit[2]）； 系统输出打印项次（秒）； } }

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使用：拆分字符串，然后获取每个值并转换为秒。我已经用粗体标出了这些行。希望这有帮助

在javadoc中查找

String.split

。还有

Integer.parseInt

。这给了你一些想法吗？顺便说一句：使用一个

格式
调用比使用三个调用+笨拙的字符串连接更简单/更干净/更有效。要构建/解析日期，你可以使用SimpleDataFormat。在javadoc中查找
字符串.split
。还有
Integer.parseInt
。这给了你一些想法吗？顺便说一句：使用一个
格式
调用比使用3个调用+笨拙的字符串连接更简单/更干净/更有效。要构建/解析日期，可以使用SimpleDateFormat。