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CountDownTimer in Android with Example

  • Difficulty Level : Expert
  • Last Updated : 19 Feb, 2021
Geek Week

CountDownTimer app is about setting a time that moves in reverse order as it shows the time left in the upcoming event. A CountDownTimer is an accurate timer that can be used for a website or blog to display the count down to any special event, such as a birthday or anniversary. Likewise, here let’s create an Android App to learn how to create a simple Countdown App. So let’s begin app creation step by step towards its completion.

countdowntimer

Approach

Step 1: Create a New Project

To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. Note that select Java as the programming language.

Step 2: Working with activity_main.xml file



In the activity_main.xml file add only a TextView to display the CountDownTimer. Below is the complete code for the activity_main.xml file.

activity_main.xml




<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#fff"
    tools:context=".MainActivity">
  
    <!-- Here adding a TextView to show countdown -->
    <TextView
        android:id="@+id/textView"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="?android:attr/detailsElementBackground"
        android:gravity="center_horizontal|center_vertical"
        android:text="TextView"
        android:textColor="@color/colorPrimary"
        android:textSize="36sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0" />
  
</androidx.constraintlayout.widget.ConstraintLayout>

Step 3: Working with MainActivity.java file

Now In MainActivity.java file, create an object of TextView and map the components(TextView) with their id. 

// Initializing thetextView

TextView textView;

textView = findViewById (R.id.textView);

Schedule a countdown until a time in the future, with regular notifications on intervals along the way. Example of showing a 50-second countdown in a text field:



new CountDownTimer(50000, 1000) {

           public void onTick(long millisUntilFinished) {

               // Used for formatting digit to be in 2 digits only

               NumberFormat f = new DecimalFormat(“00”);

               long hour = (millisUntilFinished / 3600000) % 24;

               long min = (millisUntilFinished / 60000) % 60;

               long sec = (millisUntilFinished / 1000) % 60;

               textView.setText(f.format(hour) + “:” + f.format(min) + “:” + f.format(sec));

           }

           // When the task is over it will print 00:00:00 there



           public void onFinish() {

               textView.setText(“00:00:00”);

           }

       }.start();

The complete code for the MainActivity.java file is given below.

MainActivity.java




package org.gfg.countdowntimer;
  
import android.os.Bundle;
import android.os.CountDownTimer;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
import java.text.DecimalFormat;
import java.text.NumberFormat;
  
public class MainActivity extends AppCompatActivity {
    // Initializing my textView
    TextView textView;
  
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
  
        textView = findViewById(R.id.textView);
        // Time is in millisecond so 50sec = 50000 I have used
        // countdown Interveal is 1sec = 1000 I have used
        new CountDownTimer(50000, 1000) {
            public void onTick(long millisUntilFinished) {
                // Used for formatting digit to be in 2 digits only
                NumberFormat f = new DecimalFormat("00");
                long hour = (millisUntilFinished / 3600000) % 24;
                long min = (millisUntilFinished / 60000) % 60;
                long sec = (millisUntilFinished / 1000) % 60;
                textView.setText(f.format(hour) + ":" + f.format(min) + ":" + f.format(sec));
            }
            // When the task is over it will print 00:00:00 there
            public void onFinish() {
                textView.setText("00:00:00");
            }
        }.start();
    }
}

Output: Run on Emulator

PulseCountDown

PulseCountDown in Android is an alternative to CountDownTimer. It is very easy to implement PulseCountDown instead of CountDownTimer because PulseCountDown provides a default layout with some beautiful animations. By default start value of PulseCountDown is 10 and the end value is 0. Suppose there needs a quiz app, and in that add time limit to answer a question there PulseCountDown can be used. To implement PulseCountDown please refer PulseCountDown in Android with Example.
 

pulse countdown

Pulse Count Down

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