Android Tutorials for Beginners: CountDownTimer in Android Example

What is a CountDownTimer ?

A CountDownTimer is a class in Android which enables us to do something at regular intervals.

There are 2 important methods on CountDownTimer Class

1: onTick(long) : in this method we write code to do something at regular intervals
2: onFinish() : code to execute when timer ends.

Example :

In our example, we assume that have given some task to user to finish in 10 seconds.

We will show count 1, 2, 3 ... and on till 10th seconds and show "Time Over" when 10 seconds ends.

Lets Start :

Create a new Project

activty_main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

 android:layout_width="fill_parent"

 android:layout_height="fill_parent"

 android:orientation="vertical" >


    <TextView

       android:id="@+id/textViewCounter"

       android:textSize="50dp"

       android:gravity="center"

       android:layout_width="match_parent"

       android:layout_height="match_parent"

       android:text="Time Starts" />

</LinearLayout>


MainActivity.java


import android.os.Bundle;
import android.os.CountDownTimer;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity
{

    TextView textViewCounter;
    int counter = 0;
    CountDownTimer myTimer = new CountDownTimer(10000, 1000) {
        @Override       
        public void onTick(long l) {

            // set the counter and increase it by 1          
            textViewCounter.setText(""+counter);
            counter++;
        }

        @Override        
       public void onFinish() {

            textViewCounter.setText("Time Over");
        }
    };


    @Override    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        textViewCounter = (TextView)findViewById(R.id.textViewCounter);

        // start the timer       
         myTimer.start();

    }


}


Result :

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