[英]How to fix error with CountDownTimer in android app
我试图在开始日期的几天,几小时,几分钟,几秒钟内进行倒计时,但由于某种原因我无法找到错误的日子。
String givenDateString = "2019-05-15T09:00:00";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
try {
Date mDate = sdf.parse(givenDateString);
timeInMilliseconds = mDate.getTime();
} catch (ParseException e) {
e.printStackTrace();
}
new CountDownTimer(timeInMilliseconds, 1000) {
@Override
public void onTick(long millisUntilFinished) {
long day = TimeUnit.MILLISECONDS.toDays(millisUntilFinished);
millisUntilFinished -= TimeUnit.DAYS.toMillis(day);
long hour = TimeUnit.MILLISECONDS.toHours(millisUntilFinished);
millisUntilFinished -= TimeUnit.HOURS.toMillis(hour);
long minute = TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished);
millisUntilFinished -= TimeUnit.MINUTES.toMillis(minute);
long second = TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished);
prueba.setText("Days: "+day+" Hours: "+hour+" Minutes: "+minute+" Seconds: "+second);
}
@Override
public void onFinish() {
// What ever you want !
}
}.start();
我得到了这个结果:
新错误android.view.ViewRootImpl $ CalledFromWrongThreadException:只有创建视图层次结构的原始线程才能触及其视图。
TextView prueba;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
prueba = findViewById(R.id.prueba);
Timer timer = new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
Date currentDate = null;
Date destinationDate = null;
try {
currentDate = Calendar.getInstance().getTime();
destinationDate = sdf.parse("2019-05-15T09:00:00");
} catch (ParseException e) {
e.printStackTrace();
}
calculateDifference(currentDate, destinationDate);
}
}, 0, 1000);//Update text every second
}
public void calculateDifference(Date startDate, Date endDate) {
long different = endDate.getTime() - startDate.getTime();
long secondsInMilli = 1000;
long minutesInMilli = secondsInMilli * 60;
long hoursInMilli = minutesInMilli * 60;
long daysInMilli = hoursInMilli * 24;
long days = different / daysInMilli;
different = different % daysInMilli;
long hours = different / hoursInMilli;
different = different % hoursInMilli;
long minutes = different / minutesInMilli;
different = different % minutesInMilli;
long seconds = different / secondsInMilli;
Log.e("calculation", "Days: " + days + " Hours: " + hours + " Minutes: " + minutes + " Seconds: " + seconds);
prueba.setText("Days: " + days + " Hours: " + hours + " Minutes: " + minutes + " Seconds: " + seconds);
}
您好,这里是如何实现这一目标的
这是计算两个日期之间差异的方法。
public void calculateDifference(Date startDate, Date endDate) {
long different = endDate.getTime() - startDate.getTime();
long secondsInMilli = 1000;
long minutesInMilli = secondsInMilli * 60;
long hoursInMilli = minutesInMilli * 60;
long daysInMilli = hoursInMilli * 24;
long days = different / daysInMilli;
different = different % daysInMilli;
long hours = different / hoursInMilli;
different = different % hoursInMilli;
long minutes = different / minutesInMilli;
different = different % minutesInMilli;
long seconds = different / secondsInMilli;
Log.e("calculation", "Days: " + days + " Hours: " + hours + " Minutes: " + minutes + " Seconds: " + seconds);
}
您可以设置文本视图的文本而不是日志
这就是你如何用日期调用计时器
Timer timer = new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
Date currentDate = null;
Date destinationDate = null;
try {
currentDate = Calendar.getInstance().getTime();
destinationDate = sdf.parse("2019-05-15T09:00:00");
} catch (ParseException e) {
e.printStackTrace();
}
calculateDifference(currentDate, destinationDate);
}
}, 0, 1000);//Update text every second
}
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