Check Hour Android and do something Java

Question

Good morning, i would want to know how to do something like this in android.

if(6PM are already passed){
 //do somethin
}else{
//somethin else
}

Thanks in advance.

Answer 1

You could do something like this:

1. Modern java.time API

LocalTime now = LocalTime.now(ZoneId.of("required timezone"));
if (now.getHour() >= 18) {
    //do something
} else {
    //do something else
}

2. Legacy Calendar

Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("Europe/Rome"));
int hour = calendar.get(Calendar.HOUR_OF_DAY);

Keep in mind, using the legacy API is cumbersome, error prone and generally discouraged, it's just that bad. I would recommend to research how to do desugaring.

Answer 2

To use java.time in low Android versions easily, you can use

1. ThreeTenABP

Put this in your build.gradle:

implementation 'com.jakewharton.threetenabp:threetenabp:1.4.1'

Then in your Application class:

@Override
public void onCreate() {
  super.onCreate();
  AndroidThreeTen.init(this);
}

That's all, now use java.time normally.

2. Or, as their github README suggests, use the new desugaring library

Answer 3

if other solutions didn't work for you. You can try this

import java.util.Calendar;
import java.util.Date;

Date currentTime = Calendar.getInstance().getTime();
if(currentTime.getHours() >= 18){
     // Above 6pm
} else {
     // Below 6pm
}

Answer 4

Use this function, you can extend it with dates if you want after:

public static void checkTimings() {
    String pattern = "HH:mm";
    SimpleDateFormat sdf = new SimpleDateFormat(pattern);

    try {
        Date date1 = sdf.parse(Calendar.getInstance().get(Calendar.HOUR_OF_DAY) + ":" + Calendar.getInstance().get(Calendar.MINUTE));
        Date date2 = sdf.parse("18:00");
        if (date1.before(date2)){
            //before 6pm
        } else {
            //after 6pm
        }
    } catch (ParseException e) {
        e.printStackTrace();
    }
}