Android - Countdown timer with pause and resume

Implementing a countdown timer with pause and resume functionality in Android involves managing the state of the timer, handling UI updates, and correctly managing the lifecycle of the timer. Here's how you can achieve this using a CountDownTimer and managing the pause/resume functionality:

Steps to Implement Countdown Timer with Pause/Resume:

1. Initialize UI Components:

   • Add a TextView to display the countdown.
   • Add Start, Pause, and Resume buttons to control the timer.

2. Create CountDownTimer Instance:

   • Initialize a CountDownTimer with the total duration and interval.

3. Handle Button Clicks:

   • Implement onClick listeners for Start, Pause, and Resume buttons to control the timer.

4. Manage Timer State:

   • Maintain variables to track the current state (isTimerRunning, timeRemaining, etc.).
   • Implement logic to pause and resume the timer based on button clicks.

Example Implementation:

Here's an example implementation of a countdown timer with pause and resume functionality in an Android activity:

public class MainActivity extends AppCompatActivity { private TextView textViewTimer; private Button buttonStart, buttonPause, buttonResume; private CountDownTimer countDownTimer; private long timeRemaining; private boolean isTimerRunning; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textViewTimer = findViewById(R.id.textViewTimer); buttonStart = findViewById(R.id.buttonStart); buttonPause = findViewById(R.id.buttonPause); buttonResume = findViewById(R.id.buttonResume); buttonStart.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { startTimer(); } }); buttonPause.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { pauseTimer(); } }); buttonResume.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { resumeTimer(); } }); } private void startTimer() { if (countDownTimer != null) { countDownTimer.cancel(); } countDownTimer = new CountDownTimer(timeRemaining, 1000) { @Override public void onTick(long millisUntilFinished) { timeRemaining = millisUntilFinished; updateTimerText(); } @Override public void onFinish() { isTimerRunning = false; updateTimerText(); } }; countDownTimer.start(); isTimerRunning = true; } private void pauseTimer() { if (countDownTimer != null) { countDownTimer.cancel(); isTimerRunning = false; } } private void resumeTimer() { startTimer(); } private void updateTimerText() { int minutes = (int) (timeRemaining / 1000) / 60; int seconds = (int) (timeRemaining / 1000) % 60; String timeLeftFormatted = String.format(Locale.getDefault(), "%02d:%02d", minutes, seconds); textViewTimer.setText(timeLeftFormatted); } } 

Explanation:

• Initialization: Initialize UI components (TextView for timer display, Buttons for control).
• Button Click Listeners: Implement onClick methods for Start, Pause, and Resume buttons to handle timer control.
• Timer Management: Use CountDownTimer to implement the countdown functionality. Update UI (textViewTimer) in onTick and onFinish methods.
• Pause and Resume: Cancel the CountDownTimer to pause, and start a new instance to resume.

Notes:

• Ensure to handle activity lifecycle events (onPause, onResume) to correctly manage the timer state.
• Adjust CountDownTimer initialization and update logic as per your specific timer requirements (e.g., initial duration, interval).

By following this approach, you can create a countdown timer in Android that supports pause and resume functionality, enhancing user experience when dealing with time-sensitive operations or activities.

Examples

1. How to create a simple countdown timer in Android?

   • Description: Implementing a basic countdown timer that counts down from a specified time.
   • Code:

     import android.os.Bundle; import android.os.CountDownTimer; import android.widget.TextView; import androidx.appcompat.app.AppCompatActivity; public class MainActivity extends AppCompatActivity { private TextView countdownTextView; private CountDownTimer countDownTimer; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); countdownTextView = findViewById(R.id.countdownTextView); // Milliseconds countdown, 30 seconds long totalTimeInMillis = 30 * 1000; long intervalInMillis = 1000; countDownTimer = new CountDownTimer(totalTimeInMillis, intervalInMillis) { @Override public void onTick(long millisUntilFinished) { long secondsRemaining = millisUntilFinished / 1000; countdownTextView.setText("Seconds remaining: " + secondsRemaining); } @Override public void onFinish() { countdownTextView.setText("Countdown finished"); } }; countDownTimer.start(); } @Override protected void onDestroy() { super.onDestroy(); if (countDownTimer != null) { countDownTimer.cancel(); } } } 

   • Explanation: This code initializes and starts a countdown timer for 30 seconds, updating a TextView every second until completion.

2. How to pause and resume a countdown timer in Android?

   • Description: Adding pause and resume functionality to an Android countdown timer.
   • Code:

     import android.os.Bundle; import android.os.CountDownTimer; import android.view.View; import android.widget.Button; import android.widget.TextView; import androidx.appcompat.app.AppCompatActivity; public class MainActivity extends AppCompatActivity { private TextView countdownTextView; private CountDownTimer countDownTimer; private Button startPauseButton; private boolean timerRunning; private long timeLeftInMillis = 30000; // Initial time, 30 seconds @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); countdownTextView = findViewById(R.id.countdownTextView); startPauseButton = findViewById(R.id.startPauseButton); startPauseButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (timerRunning) { pauseTimer(); } else { startTimer(); } } }); updateCountdownText(); } private void startTimer() { countDownTimer = new CountDownTimer(timeLeftInMillis, 1000) { @Override public void onTick(long millisUntilFinished) { timeLeftInMillis = millisUntilFinished; updateCountdownText(); } @Override public void onFinish() { timerRunning = false; startPauseButton.setText("Start"); } }.start(); timerRunning = true; startPauseButton.setText("Pause"); } private void pauseTimer() { countDownTimer.cancel(); timerRunning = false; startPauseButton.setText("Start"); } private void updateCountdownText() { int minutes = (int) (timeLeftInMillis / 1000) / 60; int seconds = (int) (timeLeftInMillis / 1000) % 60; String timeLeftFormatted = String.format("%02d:%02d", minutes, seconds); countdownTextView.setText(timeLeftFormatted); } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putLong("millisLeft", timeLeftInMillis); outState.putBoolean("timerRunning", timerRunning); } @Override protected void onRestoreInstanceState(Bundle savedInstanceState) { super.onRestoreInstanceState(savedInstanceState); timeLeftInMillis = savedInstanceState.getLong("millisLeft"); timerRunning = savedInstanceState.getBoolean("timerRunning"); updateCountdownText(); if (timerRunning) { startTimer(); } } } 

   • Explanation: This code demonstrates how to implement a countdown timer with start, pause, and resume functionality, updating the UI accordingly.

3. Android countdown timer with visual progress bar.

   • Description: Implementing a countdown timer with a progress bar to visualize the remaining time.
   • Code:

     <!-- activity_main.xml --> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="16dp"> <ProgressBar android:id="@+id/progressBar" style="?android:attr/progressBarStyleHorizontal" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="16dp" android:max="30000" /> <TextView android:id="@+id/countdownTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/progressBar" android:textSize="24sp" android:text="30" android:layout_centerHorizontal="true" android:layout_marginTop="16dp" /> <Button android:id="@+id/startPauseButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/countdownTextView" android:text="Start" android:layout_centerHorizontal="true" android:layout_marginTop="16dp" /> </RelativeLayout> 

     // MainActivity.java (continued) import android.os.Bundle; import android.os.CountDownTimer; import android.view.View; import android.widget.Button; import android.widget.ProgressBar; import android.widget.TextView; import androidx.appcompat.app.AppCompatActivity; public class MainActivity extends AppCompatActivity { private TextView countdownTextView; private CountDownTimer countDownTimer; private Button startPauseButton; private ProgressBar progressBar; private boolean timerRunning; private long timeLeftInMillis = 30000; // Initial time, 30 seconds @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); countdownTextView = findViewById(R.id.countdownTextView); startPauseButton = findViewById(R.id.startPauseButton); progressBar = findViewById(R.id.progressBar); startPauseButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (timerRunning) { pauseTimer(); } else { startTimer(); } } }); updateCountdownText(); } private void startTimer() { countDownTimer = new CountDownTimer(timeLeftInMillis, 1000) { @Override public void onTick(long millisUntilFinished) { timeLeftInMillis = millisUntilFinished; updateCountdownText(); progressBar.setProgress((int) (millisUntilFinished / 1000)); } @Override public void onFinish() { timerRunning = false; startPauseButton.setText("Start"); } }.start(); timerRunning = true; startPauseButton.setText("Pause"); } private void pauseTimer() { countDownTimer.cancel(); timerRunning = false; startPauseButton.setText("Start"); } private void updateCountdownText() { int seconds = (int) (timeLeftInMillis / 1000); countdownTextView.setText(String.valueOf(seconds)); } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putLong("millisLeft", timeLeftInMillis); outState.putBoolean("timerRunning", timerRunning); } @Override protected void onRestoreInstanceState(Bundle savedInstanceState) { super.onRestoreInstanceState(savedInstanceState); timeLeftInMillis = savedInstanceState.getLong("millisLeft"); timerRunning = savedInstanceState.getBoolean("timerRunning"); updateCountdownText(); if (timerRunning) { startTimer(); } } } 

   • Explanation: This XML layout and Java code demonstrate how to integrate a progress bar with a countdown timer in Android, updating the progress bar and countdown text accordingly.

4. Android countdown timer with notification when timer finishes.

   • Description: Implementing a countdown timer that sends a notification when the timer completes.
   • Code:

     import android.app.NotificationChannel; import android.app.NotificationManager; import android.content.Context; import android.graphics.Color; import android.os.Build; import android.os.Bundle; import android.os.CountDownTimer; import android.view.View; import android.widget.Button; import android.widget.TextView; import androidx.appcompat.app.AppCompatActivity; import androidx.core.app.NotificationCompat; import androidx.core.app.NotificationManagerCompat; public class MainActivity extends AppCompatActivity { private static final String CHANNEL_ID = "timer_notification"; private static final int NOTIFICATION_ID = 1; private TextView countdownTextView; private CountDownTimer countDownTimer; private Button startPauseButton; private boolean timerRunning; private long timeLeftInMillis = 30000; // Initial time, 30 seconds @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); countdownTextView = findViewById(R.id.countdownTextView); startPauseButton = findViewById(R.id.startPauseButton); createNotificationChannel(); startPauseButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (timerRunning) { pauseTimer(); } else { startTimer(); } } }); updateCountdownText(); } private void startTimer() { countDownTimer = new CountDownTimer(timeLeftInMillis, 1000) { @Override public void onTick(long millisUntilFinished) { timeLeftInMillis = millisUntilFinished; updateCountdownText(); } @Override public void onFinish() { timerRunning = false; startPauseButton.setText("Start"); showTimerFinishedNotification(); } }.start(); timerRunning = true; startPauseButton.setText("Pause"); } private void pauseTimer() { countDownTimer.cancel(); timerRunning = false; startPauseButton.setText("Start"); } private void updateCountdownText() { int seconds = (int) (timeLeftInMillis / 1000); countdownTextView.setText(String.valueOf(seconds)); } private void createNotificationChannel() { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { CharSequence name = "Timer Notification"; String description = "Channel for Timer Notification"; int importance = NotificationManager.IMPORTANCE_DEFAULT; NotificationChannel channel = new NotificationChannel(CHANNEL_ID, name, importance); channel.setDescription(description); channel.enableLights(true); channel.setLightColor(Color.BLUE); NotificationManager notificationManager = getSystemService(NotificationManager.class); notificationManager.createNotificationChannel(channel); } } private void showTimerFinishedNotification() { NotificationCompat.Builder builder = new NotificationCompat.Builder(this, CHANNEL_ID) .setSmallIcon(R.drawable.ic_notification) .setContentTitle("Timer Finished") .setContentText("Your countdown timer has finished.") .setPriority(NotificationCompat.PRIORITY_DEFAULT); NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this); notificationManager.notify(NOTIFICATION_ID, builder.build()); } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putLong("millisLeft", timeLeftInMillis); outState.putBoolean("timerRunning", timerRunning); } @Override protected void onRestoreInstanceState(Bundle savedInstanceState) { super.onRestoreInstanceState(savedInstanceState); timeLeftInMillis = savedInstanceState.getLong("millisLeft"); timerRunning = savedInstanceState.getBoolean("timerRunning"); updateCountdownText(); if (timerRunning) { startTimer(); } } } 

   • Explanation: This code adds a notification feature to the countdown timer, notifying the user when the timer completes.

5. Android countdown timer with pause and resume button functionality using services.

   • Description: Implementing a countdown timer with pause and resume functionality using Android services.
   • Code:

     // TimerService.java import android.app.Service; import android.content.Intent; import android.os.Binder; import android.os.CountDownTimer; import android.os.IBinder; public class TimerService extends Service { private final IBinder binder = new LocalBinder(); private CountDownTimer countDownTimer; private long timeLeftInMillis = 30000; // Initial time, 30 seconds public class LocalBinder extends Binder { TimerService getService() { return TimerService.this; } } @Override public IBinder onBind(Intent intent) { return binder; } public void startTimer() { countDownTimer = new CountDownTimer(timeLeftInMillis, 1000) { @Override public void onTick(long millisUntilFinished) { timeLeftInMillis = millisUntilFinished; // Update UI or send broadcast to update UI } @Override public void onFinish() { // Timer finished logic } }.start(); } public void pauseTimer() { if (countDownTimer != null) { countDownTimer.cancel(); } } public long getTimeLeftInMillis() { return timeLeftInMillis; } @Override public void onDestroy() { super.onDestroy(); if (countDownTimer != null) { countDownTimer.cancel(); } } } 

     // MainActivity.java (continued) import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.ServiceConnection; import android.os.Bundle; import android.os.IBinder; import android.view.View; import android.widget.Button; import android.widget.TextView; import androidx.appcompat.app.AppCompatActivity; public class MainActivity extends AppCompatActivity { private TimerService timerService; private boolean isBound = false; private TextView countdownTextView; private Button startPauseButton; private ServiceConnection serviceConnection = new ServiceConnection() { @Override public void onServiceConnected(ComponentName name, IBinder service) { TimerService.LocalBinder binder = (TimerService.LocalBinder) service; timerService = binder.getService(); isBound = true; } @Override public void onServiceDisconnected(ComponentName name) { isBound = false; } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); countdownTextView = findViewById(R.id.countdownTextView); startPauseButton = findViewById(R.id.startPauseButton); startPauseButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (timerService != null) { if (timerService.isTimerRunning()) { timerService.pauseTimer(); } else { timerService.startTimer(); } } } }); } @Override protected void onStart() { super.onStart(); Intent intent = new Intent(this, TimerService.class); bindService(intent, serviceConnection, Context.BIND_AUTO_CREATE); } @Override protected void onStop() { super.onStop(); if (isBound) { unbindService(serviceConnection); isBound = false; } } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); if (timerService != null) { outState.putLong("millisLeft", timerService.getTimeLeftInMillis()); outState.putBoolean("timerRunning", timerService.isTimerRunning()); } } @Override protected void onRestoreInstanceState(Bundle savedInstanceState) { super.onRestoreInstanceState(savedInstanceState); if (timerService != null) { long millisLeft = savedInstanceState.getLong("millisLeft"); boolean timerRunning = savedInstanceState.getBoolean("timerRunning"); if (timerRunning) { timerService.startTimer(); } else { timerService.pauseTimer(); } } } } 

   • Explanation: This code demonstrates how to implement a countdown timer using an Android service, enabling pause and resume functionality.

6. How to format the countdown timer display in minutes and seconds in Android?

   • Description: Displaying the countdown timer in minutes and seconds format on an Android UI.
   • Code:

     private void updateCountdownText() { int minutes = (int) (timeLeftInMillis / 1000) / 60; int seconds = (int) (timeLeftInMillis / 1000) % 60; String timeLeftFormatted = String.format("%02d:%02d", minutes, seconds); countdownTextView.setText(timeLeftFormatted); } 

   • Explanation: Use String.format to format the remaining time in minutes:seconds format for better readability on the UI.

7. Android countdown timer with sound alert on completion.

   • Description: Adding a sound alert when the countdown timer completes in an Android application.
   • Code:

     import android.media.MediaPlayer; import android.os.Bundle; import android.os.CountDownTimer; import android.view.View; import android.widget.Button; import android.widget.TextView; import androidx.appcompat.app.AppCompatActivity; public class MainActivity extends AppCompatActivity { private TextView countdownTextView; private CountDownTimer countDownTimer; private Button startPauseButton; private MediaPlayer mediaPlayer; private boolean timerRunning; private long timeLeftInMillis = 30000; // Initial time, 30 seconds @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); countdownTextView = findViewById(R.id.countdownTextView); startPauseButton = findViewById(R.id.startPauseButton); mediaPlayer = MediaPlayer.create(this, R.raw.alert_sound); startPauseButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (timerRunning) { pauseTimer(); } else { startTimer(); } } }); updateCountdownText(); } private void startTimer() { countDownTimer = new CountDownTimer(timeLeftInMillis, 1000) { @Override public void onTick(long millisUntilFinished) { timeLeftInMillis = millisUntilFinished; updateCountdownText(); } @Override public void onFinish() { timerRunning = false; startPauseButton.setText("Start"); playAlertSound(); } }.start(); timerRunning = true; startPauseButton.setText("Pause"); } private void pauseTimer() { countDownTimer.cancel(); timerRunning = false; startPauseButton.setText("Start"); } private void updateCountdownText() { int seconds = (int) (timeLeftInMillis / 1000); countdownTextView.setText(String.valueOf(seconds)); } private void playAlertSound() { mediaPlayer.start(); // Optionally implement notification or other UX update on sound alert } @Override protected void onDestroy() { super.onDestroy(); if (mediaPlayer != null) { mediaPlayer.release(); mediaPlayer = null; } } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putLong("millisLeft", timeLeftInMillis); outState.putBoolean("timerRunning", timerRunning); } @Override protected void onRestoreInstanceState(Bundle savedInstanceState) { super.onRestoreInstanceState(savedInstanceState); timeLeftInMillis = savedInstanceState.getLong("millisLeft"); timerRunning = savedInstanceState.getBoolean("timerRunning"); updateCountdownText(); if (timerRunning) { startTimer(); } } } 

   • Explanation: This code adds a sound alert feature to the countdown timer, playing a sound when the timer completes.

8. Implementing a countdown timer with a progress bar in Android.

   • Description: Displaying the countdown timer progress using a ProgressBar in an Android application.
   • Code:

     import android.os.Bundle; import android.os.CountDownTimer; import android.view.View; import android.widget.Button; import android.widget.ProgressBar; import android.widget.TextView; import androidx.appcompat.app.AppCompatActivity; public class MainActivity extends AppCompatActivity { private ProgressBar countdownProgressBar; private TextView countdownTextView; private CountDownTimer countDownTimer; private Button startPauseButton; private boolean timerRunning; private long timeLeftInMillis = 30000; // Initial time, 30 seconds @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); countdownProgressBar = findViewById(R.id.countdownProgressBar); countdownTextView = findViewById(R.id.countdownTextView); startPauseButton = findViewById(R.id.startPauseButton); startPauseButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (timerRunning) { pauseTimer(); } else { startTimer(); } } }); updateCountdownText(); } private void startTimer() { countDownTimer = new CountDownTimer(timeLeftInMillis, 1000) { @Override public void onTick(long millisUntilFinished) { timeLeftInMillis = millisUntilFinished; updateCountdownText(); updateProgressBar(); } @Override public void onFinish() { timerRunning = false; startPauseButton.setText("Start"); countdownProgressBar.setProgress(0); } }.start(); timerRunning = true; startPauseButton.setText("Pause"); } private void pauseTimer() { countDownTimer.cancel(); timerRunning = false; startPauseButton.setText("Start"); } private void updateCountdownText() { int seconds = (int) (timeLeftInMillis / 1000); countdownTextView.setText(String.valueOf(seconds)); } private void updateProgressBar() { int progress = (int) ((timeLeftInMillis / 1000) * 100 / (30000 / 1000)); // Adjust maximum time here countdownProgressBar.setProgress(progress); } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putLong("millisLeft", timeLeftInMillis); outState.putBoolean("timerRunning", timerRunning); } @Override protected void onRestoreInstanceState(Bundle savedInstanceState) { super.onRestoreInstanceState(savedInstanceState); timeLeftInMillis = savedInstanceState.getLong("millisLeft"); timerRunning = savedInstanceState.getBoolean("timerRunning"); updateCountdownText(); if (timerRunning) { startTimer(); } } } 

   • Explanation: This code integrates a ProgressBar with the countdown timer to visually represent the remaining time.

9. Android countdown timer with interval notifications.

   • Description: Sending notifications at specified intervals during a countdown timer in an Android app.
   • Code:

     private CountDownTimer countDownTimer; private long timeLeftInMillis = 30000; // Initial time, 30 seconds private final long INTERVAL = 10000; // Interval time, 10 seconds private void startTimer() { countDownTimer = new CountDownTimer(timeLeftInMillis, INTERVAL) { @Override public void onTick(long millisUntilFinished) { timeLeftInMillis = millisUntilFinished; updateCountdownText(); if (millisUntilFinished < INTERVAL) { sendIntervalNotification("10 seconds remaining"); } } @Override public void onFinish() { timerRunning = false; startPauseButton.setText("Start"); sendTimerFinishedNotification(); } }.start(); timerRunning = true; startPauseButton.setText("Pause"); } private void sendIntervalNotification(String message) { // Implement notification logic here } private void sendTimerFinishedNotification() { // Implement notification logic here } 

   • Explanation: This code modifies the CountDownTimer to send notifications at specified intervals during the countdown.

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