如何设置计时器的开始时间 [英] How can I set the start time for a chronometer

问题描述

我有一个带有计时器的应用程序，我需要将开始时间设置为与日期之间的差值

I have an application that has a chronometer, I need to set the start time to a difference between to dates

我该怎么做?

推荐答案

一种方法是扩展Chronometer类……类似这样:

One way of doing this is to extends the Chronometer class... something like this:

public class MyChronometer extends Chronometer {

    public int msElapsed;
    public boolean isRunning = false;

    public MyChronometer(Context context) {
        super(context);
    }

    public int getMsElapsed() {
        return msElapsed;
    }

    public void setMsElapsed(int ms) {
        setBase(getBase() - ms);
        msElapsed  = ms;
    }

    @Override
    public void start() {
        super.start();
        setBase(SystemClock.elapsedRealtime() - msElapsed);
        isRunning = true;
    }

    @Override
    public void stop() {
        super.stop();
        if(isRunning) {
            msElapsed = (int)(SystemClock.elapsedRealtime() - this.getBase());
        }
        isRunning = false;
    }
}

您可以使用setMsElapsed(int ms)指定偏移量.您可能必须将Dates转换为Long，然后从那里进行数学运算.如果您指定类所在的整个包，则可以在XML布局中使用该类.

You can use setMsElapsed(int ms) to specify your offset. You will probably have to convert your Dates to Long and do the math from there. The class can be used in XML layout if you specify the whole package where the class resides.

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