CountDownTimer in Android with Example
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.
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 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 Count Down
Attention reader! Don’t stop learning now. Get hold of all the important Java Foundation and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready. To complete your preparation from learning a language to DS Algo and many more, please refer Complete Interview Preparation Course.
