Update time and add hours and minutes

It is necessary that the program read the current time of the user, update it every minute. Also, to output time and minutes with the format: HH + n hours: mm + t minutes

Here's how I got the current time:

DateFormat dfh = new SimpleDateFormat("HH:mm"); final String date = dfh.format(Calendar.getInstance().getTime()); 

I tried other methods, but the application either crashed or showed some sort of rubbish. as I tried to update the time:

  Timer timer = new Timer(); timer.schedule(new getTimeEverySecond(), 0, 1000); // ставим на выполнение каждую секунду static class getTimeEverySecond extends TimerTask { public void run() { DateFormat dateFormat = new SimpleDateFormat("HH:mm:ss"); Date date = new Date(); s = dateFormat.format(date); // каждую секунду обновляем переменную } } 

when trying to do as above, the application wrote a lot of text.

Also, through while (true), but everything was burning red from this.

as I tried to add time:

  Calendar cal = Calendar.getInstance(); // creates calendar cal.setTime(new Date()); // sets calendar time/date cal.add(Calendar.HOUR_OF_DAY, 1); // adds one hour cal.getTime(); 

I asked a similar question yesterday, I was advised to get time like this:

 DateTime.now().toLocalDate().toString(DateTimeFormat.forPattern("HH:mm")) DateTime.now().plusHours(1).plusMinutes(10).toString(DateTimeFormat.forPattern("EEEE dd MMMM, YYYY")) 

but when I tried to do this, DateTime and DateTimeFormat were not recognized and the android offered to make a new class / variable / method with such names.

How to make the application constantly update the current time? How to make it so that you can output time in the format HH + n hours: mm + t minutes?

All my fragment code in which I try to implement it is:

 package com.example.itss; import android.os.Build; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.support.annotation.RequiresApi; import android.support.v4.app.Fragment; import android.text.Layout; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.LinearLayout; import org.joda.time.DateTime; import org.joda.time.format.DateTimeFormat; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.time.LocalTime; import java.time.format.DateTimeFormatter; import java.util.Calendar; import java.util.Date; import java.util.TimeZone; import java.util.Timer; import java.util.TimerTask; public class PhaseFragment extends Fragment { Button timeToWakeUp0; Button timeToWakeUp1; Button timeToWakeUp2; Button timeToWakeUp3; Button timeToWakeUp4; Button timeToWakeUp5; Button timeToWakeUp6; Button timeToWakeUp7; Button timeToSleep0; Button timeToSleep1; Button timeToSleep2; Button timeToSleep3; Button timeToSleep4; Button timeToSleep5; Button timeToSleep6; Button timeToSleep7; @RequiresApi(api = Build.VERSION_CODES.O) @Nullable @Override public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View v = inflater.inflate(R.layout.phase_fragment,container, false); DateFormat dfh = new SimpleDateFormat("HH:mm"); final String date = dfh.format(Calendar.getInstance().getTime()); Calendar cal = Calendar.getInstance(); // creates calendar cal.setTime(new Date()); // sets calendar time/date cal.add(Calendar.HOUR_OF_DAY, 1); // adds one hour cal.getTime(); DateTime.now().toLocalDate().toString(DateTimeFormat.forPattern("HH:mm")); Timer timer = new Timer(); timer.schedule(new getTimeEverySecond(), 0, 1000); timeToWakeUp0 = v.findViewById(R.id.sleeptime0); timeToWakeUp0.setText(DateTime.now().plusHours(1).plusMinutes(10).toString(DateTimeFormat.forPattern("HH:mm"))); timeToWakeUp1 = v.findViewById(R.id.sleeptime1); timeToWakeUp1.setText(timer + ""); timeToWakeUp2 = v.findViewById(R.id.sleeptime2); timeToWakeUp2.setText(date); timeToWakeUp3 = v.findViewById(R.id.sleeptime3); timeToWakeUp4 = v.findViewById(R.id.sleeptime4); timeToWakeUp5 = v.findViewById(R.id.sleeptime5); timeToWakeUp6 = v.findViewById(R.id.sleeptime6); timeToWakeUp7 = v.findViewById(R.id.sleeptime7); timeToSleep0 = v.findViewById(R.id.wakeuptime0); timeToSleep1 = v.findViewById(R.id.wakeuptime1); timeToSleep2 = v.findViewById(R.id.wakeuptime2); timeToSleep3 = v.findViewById(R.id.wakeuptime3); timeToSleep4 = v.findViewById(R.id.wakeuptime4); timeToSleep5 = v.findViewById(R.id.wakeuptime5); timeToSleep6 = v.findViewById(R.id.wakeuptime6); timeToSleep7 = v.findViewById(R.id.wakeuptime7); timeToWakeUp0.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); timeToWakeUp1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); timeToWakeUp2.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); timeToWakeUp3.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); timeToWakeUp4.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); timeToWakeUp5.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); timeToWakeUp6.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); timeToWakeUp7.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); timeToSleep0.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); timeToSleep1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); timeToSleep2.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); timeToSleep3.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); timeToSleep4.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); timeToSleep5.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); timeToSleep6.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); timeToSleep7.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); return v; } static class getTimeEverySecond extends TimerTask { public void run() { DateFormat dateFormat = new SimpleDateFormat("HH:mm:ss"); Date date = new Date(); String s = dateFormat.format(date); // каждую секунду обновляем переменную } } }