How To Get Remaining Time?

I used alarm manager to do a work after a certain minute. But i need to find the remaining time whenever I open that activity.How to do that? Intent myIntent = new Intent(Activity1

Solution 1:

This is not a good way to do a timer, i would suggest using a CountDownTimer then on onTick u get from that time u know the remaining time, and best way in that case to move that data to the activity is using

intent.putExtra

read more here:

https://developer.android.com/reference/android/os/CountDownTimer.html

https://developer.android.com/reference/android/content/Intent.html

Solution 2:

java.util.Date EndTime; //time from you are calculating remaining
java.util.DateCurrentTime=null; // current timeSimpleDateFormatdateFormat2=newSimpleDateFormat("HH:mm:ss");
CurrentTime = dateFormat2.parse(dateFormat2.format(newjava.util.Date()));
EndTime = dateFormat2.parse(time_in_string);
longremaining_time= EndTime.getTime() - CurrentTime.getTime();//in milliseconds

Solution 3:

First Choose SimpleDateFormat as SimpleDateFormat("yyyy-MM-dd hh:mm:ss a") then you need to pass all the required parameters into date format like (year-month-day hour:minute:second AM) i.e (2021-01-13 5:52:00 AM). Then simple current time and subrrate current time from endtime.

My code:

java.util.Date EndTime; //time from you are calculating remaining
java.util.DateCurrentTime=null; // current timeSimpleDateFormatdateFormat2=newSimpleDateFormat("yyyy-MM-dd hh:mm:ss a");

CurrentTime = dateFormat2.parse(dateFormat2.format(newDate()));

EndTime = dateFormat2.parse(yearSelected + "-" + monthSelected + "-" + (day + 1) + " " + fajrTimeValue + ":00 AM");

longremainingTime= (EndTime.getTime() - CurrentTime.getTime()) / 1000;//in seconds
Log.d(TAG, "startFajrAlert: remainingTime: " + remainingTime);

Intentintent=newIntent(getContext(), FajrReceiver.class);
PendingIntentpendingIntent= PendingIntent.getBroadcast(getActivity().getApplicationContext(), 234324243, intent, 0);
AlarmManageralarmManager= (AlarmManager) getActivity().getSystemService(ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + remainingTime, AlarmManager.INTERVAL_DAY, pendingIntent);

Note: If the result from subtraction comes in negative then it's means you have passed a past time in the endTime.

Solution 4:

Try this:

AlarmManageralarmManager= (AlarmManager) getSystemService(ALARM_SERVICE);
        LongNexClockTime= alarmManager.getNextAlarmClock().getTriggerTime();
        Longnow= System.currentTimeMillis();
        LongtimeLeft= NexClockTime - now;

Solution 5:

You have to create a timer and override its onTick method. Then you can update your timeleft variable in the intervals you want;

Check my complete answer here: https://stackoverflow.com/a/46012948/2351486