I have a 5 minutes timer. In case i finish 30 seconds its shown 4:30 but i want set 30 seconds.
code to decrease time
String timeReminder= String.format(Locale.ENGLISH , "%02d:%02d" , TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished) , TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished)) );
timerText.setText(timeReminder);
i want only reminder time.
You can use java.time.Duration
which is modelled on ISO-8601 standards and was introduced with Java-8 as part of JSR-310 implementation . With Java-9 some more convenience methods were introduced.
import java.time.Duration;
import java.util.Locale;
public class Main {
public static void main(String[] args) {
Duration total = Duration.ofMinutes(5);
Duration elapsed = Duration.ofSeconds(30);
Duration remaining = total.minus(elapsed);
// ###############Java 8###########################
String timeReminder = String.format(Locale.ENGLISH, "%02d:%02d", remaining.toMinutes(),
remaining.toSeconds() % 60);
System.out.println(timeReminder);
// ################################################
// ###############Java 9###########################
timeReminder = String.format(Locale.ENGLISH, "%02d:%02d", remaining.toMinutesPart(), remaining.toSecondsPart());
System.out.println(timeReminder);
// ################################################
}
}
Output:
04:30
04:30
Learn more about the modern date-time API from Trail: Date Time .
Ok, I guess the word you are looking for is elapsed time, however, your logic doesn't seem correct.
So here is the example,
Long startTime = System.currentTimeMillis();
Long estimatedTime = TimeUnit.MINUTES.toMillis(10); // For 10 minutes
To calculate elapsed time:
Long elapsedTime = System.currentTimeMillis() - startTime;
To calculate Remaining time:
Long remainingTime = estimatedTime - System.currentTimeMillis();
Now you have both times in Millis, You can easily convert and format in Minutes:Second format.
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