Android Chronometer的正常暂停和继续

时间:2022-06-11 10:21:37

最近做了个小实验--一个小的计数秒表,实现开始计时,暂停计时,重置的功能。界面如下

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" alt="" />

界面过于简单,这里就飘过。

制作这个秒表主要用到Chronometer类的start()函数,stop()函数,setBase()函数。

查了下源码,这个Chronometer的原理就是先设置一个mBase变量,在类被创建时调用init函数将系统启动后所用掉的时间赋给mBase。源码如下

Android Chronometer的正常暂停和继续

而Chronometer控件显示的时间就是 : 系统启动后所用掉的时间 - mBase

当你想让秒表开始计时就调用start函数,这是Chronometer就会自己刷新时间。

而想暂停就调用stop函数,问题就是一个stop函数,这个stop函数只是停止Chronometer刷新时间,而系统的时间还是在继续计时的。

当你再次调用start函数时,刷新的时间就不是你调用stop函数那一刻的时间,而是从你创建类开始所经过的时间。

而如果想要实现继续功能就需要费电功夫了。

我的实现方法就是,在按下stop时就把当前系统的时间保存起来,当按下开始时重新设置mBase变量,从而使当前显示时间不变并继续计时。

具体代码如下:

switch (v.getId()){
case R.id.btn_start:
if(!flag){
flag = !flag;
if(mRecordTime != 0){
Chron.setBase(Chron.getBase() + (SystemClock.elapsedRealtime() - mRecordTime));
}else{
Chron.setBase(SystemClock.elapsedRealtime());
}
Chron.start();
}
break;
case R.id.btn_stop:
if(flag){
flag = !flag;
Chron.stop();
mRecordTime = SystemClock.elapsedRealtime();
}
break;
case R.id.btn_reset:
Chron.stop();
Chron.setBase(SystemClock.elapsedRealtime());
mRecordTime = 0;
flag = false;
break;
default: break;
}

同时还定义了一个boolean的变量,防止因为乱按而使得时间出现错乱。

这次的代码过于简单就不贴源码了。-_-#