how to compare time in android

Question

I want to compare system time and user input time , i am comparing but i dont know its right or wrong statement because if(check) is not running here is my code

 c = Calendar.getInstance();
  SimpleDateFormat df1 = new SimpleDateFormat(" hh:mm a");
    String strdate = df1.format(c.getTime());
    Toast.makeText(getApplicationContext(), strdate , Toast.LENGTH_LONG).show();

Above Toast line showing the current time of system i.e. 04:50 AM

Toast.makeText(getApplicationContext(),  prayerTimes.get(0) , Toast.LENGTH_LONG).show();

this toast line showing the timing of user input i.e. 06:30 AM

if(strdate ==prayerTimes.get(0))
{
Intent in = new Intent(MainActivity.this, Dialog.class);
startActivity(in);
finish();
Toast.makeText(getApplicationContext(), "yahoo", Toast.LENGTH_LONG).show();
}

When both times will be same IF Check not work...Please help me how i can compare both times???

will you please tell me how to convert (strdate) into millisecond? — user3409263, Mar 14 '14 at 06:48
Check this http://stackoverflow.com/questions/9671085/convert-date-to-miliseconds — Jitender Dev, Mar 14 '14 at 06:49
thankyou sir i converted the system time into milliseconds but how i can convert this (prayerTimes.get(0)) into milliseconds? — user3409263, Mar 14 '14 at 06:56
long l = Long.parseLong((String) prayerTimes.get(0)); i am doing this but its not working although long currentTime = System.currentTimeMillis(); getting the system time correctly but do not parse user set time — user3409263, Mar 14 '14 at 11:42

score 0 · Answer 1 · answered Mar 14 '14 at 06:28

use equals() instead of == because you are comparing strings.

   if(strdate.equals(prayerTimes.get(0)))
{
Intent in = new Intent(MainActivity.this, Dialog.class);
startActivity(in);
finish();
Toast.makeText(getApplicationContext(), "yahoo", Toast.LENGTH_LONG).show();
}

maddy d · Answer 2 · 2014-03-14T12:18:05.907

0

I will suggest you not to compare two strings instead convert your both time into long and then compare it. To get current time use

long currentTime = System.currentTimeMillis();

pass your user time in below function to get user time in millisec and then compare both

private long getUserTime(String time){
    SimpleDateFormat df1 = new SimpleDateFormat(" hh:mm a");
    long timeInms = 0;
    Date date = null;
    try {
        date = df1.parse(time);
    } catch (ParseException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
     timeInms = date.getTime();
    return timeInms;

}

edited Mar 14 '14 at 12:18

answered Mar 14 '14 at 06:34

maddy d

1,530
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will you please tell me how to convert (strdate) into millisecond? – user3409263 Mar 14 '14 at 06:49
check [example](http://stackoverflow.com/questions/19419374/android-convert-date-and-time-to-milliseconds) to convert your time string into millisecond – maddy d Mar 14 '14 at 07:11
long l = Long.parseLong((String) prayerTimes.get(0)); i am doing this but its not working although long currentTime = System.currentTimeMillis(); getting the system time correctly but do not parse user set time – user3409263 Mar 14 '14 at 11:36
how do you set time for user, I mean your prayerTimes.get(0) what is it? – maddy d Mar 14 '14 at 11:58
prayerTimes.get(0) getting time like 4:55 – user3409263 Mar 14 '14 at 12:02
i am using your updated code it showing following error 03-15 at qibla.prayer.timing.MainActivity.getUserTime(MainActivity.java:259) – user3409263 Mar 15 '14 at 09:52

score 0 · Answer 3 · answered Aug 24 '17 at 06:04

public class NotificationService extends Service {


    private Intent myIntent;
    MaterialDialog dialog;

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        this.myIntent = intent;

        final Handler handler = new Handler();
        Runnable runnable = new Runnable() {
            @RequiresApi(api = Build.VERSION_CODES.N)
            @Override
            public void run() {
                handler.postDelayed(this, 1000);

                Calendar calendar1 = Calendar.getInstance();
                SimpleDateFormat formatter1 = new SimpleDateFormat("dd/M/yyyy h:mm");
                String currentDate = formatter1.format(calendar1.getTime());

                String dateString = "11/08/2017";
                String timeString = "07:00";
                String datadb = dateString + " " + timeString;
             
                //comparing with the exac date/time/year what ever your wish

                if (currentDate.compareTo(datadb) >= 0) {
                    showDialog("msg"); // you can send extra information to service via intent

                }


            }
        };

        handler.postDelayed(runnable, 1000);


        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Toast.makeText(getApplicationContext(), "in service created", Toast.LENGTH_LONG).show();

    }

    private void showDialog(String message) {

//  NotificationCompat.Builder mBuilder =
        new NotificationCompat.Builder(this)
                .setSmallIcon(R.drawable.holo_meducate)
                .setLargeIcon(BitmapFactory.decodeResource(getApplicationContext().getResources(), R.drawable.pdf_banner))
                .setContentTitle(msg)
                .setStyle(new NotificationCompat.BigTextStyle()
                        .bigText(Html.fromHtml(description)))
                .setContentText(Html.fromHtml(description))

                .setSound(getNotificationSoundUri());

        mBuilder.setContentIntent(contentIntent);
        mBuilder.setAutoCancel(true);
        mNotificationManager.notify(num, mBuilder.build());
        setLatestNotificationFlag();
    }


    @Override
    public void onDestroy() {
        if (dialog != null) {
            dialog.dismiss();
        }
        super.onDestroy();
    }

Start a service and inside a service start a runnable thrade in loop which reoccurs at every 30 sec and the compare the system time with required time and that will automatically fire notification ...

how to compare time in android

3 Answers3