android - Open application after clicking on Notification

Android - Open application after clicking on Notification

To open an application when a user clicks on a notification in Android, you need to set up an Intent that starts your main activity. This Intent is then used to build the notification. Below is a step-by-step guide to achieve this.

Step-by-Step Guide

  1. Create a Notification Channel (required for Android 8.0 and above).
  2. Build the Notification.
  3. Set the PendingIntent to open the application.
  4. Show the Notification.

Example Code

1. Create a Notification Channel (for Android 8.0 and above)

import android.app.NotificationChannel; import android.app.NotificationManager; import android.content.Context; import android.os.Build; public class NotificationHelper { public static final String CHANNEL_ID = "your_channel_id"; public static final String CHANNEL_NAME = "Your Channel Name"; public static void createNotificationChannel(Context context) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { NotificationChannel channel = new NotificationChannel( CHANNEL_ID, CHANNEL_NAME, NotificationManager.IMPORTANCE_DEFAULT ); NotificationManager manager = context.getSystemService(NotificationManager.class); if (manager != null) { manager.createNotificationChannel(channel); } } } }

2. Build and Show the Notification

import android.app.NotificationManager; import android.app.PendingIntent; import android.content.Context; import android.content.Intent; import androidx.core.app.NotificationCompat; public class NotificationUtils { public static void showNotification(Context context) { // Create an explicit intent for an Activity in your app Intent intent = new Intent(context, MainActivity.class); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK); PendingIntent pendingIntent = PendingIntent.getActivity( context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); NotificationCompat.Builder builder = new NotificationCompat.Builder(context, NotificationHelper.CHANNEL_ID) .setSmallIcon(R.drawable.ic_notification) // Set the icon for the notification .setContentTitle("Notification Title") .setContentText("This is the notification content.") .setPriority(NotificationCompat.PRIORITY_DEFAULT) .setContentIntent(pendingIntent) .setAutoCancel(true); // Automatically remove the notification when tapped NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE); if (notificationManager != null) { notificationManager.notify(1, builder.build()); } } }

3. Call Notification Methods

In your MainActivity or wherever appropriate in your app, call the methods to create the notification channel and show the notification.

import android.os.Bundle; import androidx.appcompat.app.AppCompatActivity; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Create the notification channel (for Android 8.0 and above) NotificationHelper.createNotificationChannel(this); // Show the notification NotificationUtils.showNotification(this); } }

Explanation:

  • Notification Channel: NotificationHelper.createNotificationChannel creates a notification channel for Android 8.0 and above. This is required to show notifications.
  • Intent and PendingIntent: An Intent is created to open MainActivity. This intent is wrapped in a PendingIntent which is used in the notification.
  • Notification Builder: NotificationCompat.Builder is used to create the notification. setContentIntent is set with the PendingIntent to open the app when the notification is clicked.
  • Show Notification: The NotificationManager is used to show the notification with a unique ID.

Notes:

  • Make sure you have the necessary permissions in your AndroidManifest.xml to use notifications.
  • Customize the notification icon and other parameters as needed.
  • Test the notification on various Android versions to ensure compatibility.

Examples

  1. Android open app on notification click using PendingIntent Description: Open the application when a user clicks on a notification using PendingIntent in Android.

    // Create a PendingIntent for the notification Intent intent = new Intent(context, MainActivity.class); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK); PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0); // Build the notification NotificationCompat.Builder builder = new NotificationCompat.Builder(context, channelId) .setSmallIcon(R.drawable.notification_icon) .setContentTitle("Notification Title") .setContentText("Notification Text") .setContentIntent(pendingIntent) .setAutoCancel(true); // Show the notification NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context); notificationManager.notify(notificationId, builder.build());

  2. How to open activity on notification click in Android using TaskStackBuilder? Description: Use TaskStackBuilder to open a specific activity when a notification is clicked in Android.

    // Create an Intent for the activity to open Intent resultIntent = new Intent(context, MainActivity.class); // Create a TaskStackBuilder to manage the back stack TaskStackBuilder stackBuilder = TaskStackBuilder.create(context); stackBuilder.addNextIntentWithParentStack(resultIntent); // Get the PendingIntent containing the entire back stack PendingIntent pendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT); // Build the notification NotificationCompat.Builder builder = new NotificationCompat.Builder(context, channelId) .setSmallIcon(R.drawable.notification_icon) .setContentTitle("Notification Title") .setContentText("Notification Text") .setContentIntent(pendingIntent) .setAutoCancel(true); // Show the notification NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context); notificationManager.notify(notificationId, builder.build());

  3. Android open specific fragment on notification click using PendingIntent Description: Open a specific fragment within an activity when a notification is clicked using PendingIntent in Android.

    // Create an Intent for the activity containing the fragment Intent intent = new Intent(context, MainActivity.class); intent.putExtra("fragmentToOpen", "your_fragment_tag"); // Create a PendingIntent for the notification PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); // Build the notification NotificationCompat.Builder builder = new NotificationCompat.Builder(context, channelId) .setSmallIcon(R.drawable.notification_icon) .setContentTitle("Notification Title") .setContentText("Notification Text") .setContentIntent(pendingIntent) .setAutoCancel(true); // Show the notification NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context); notificationManager.notify(notificationId, builder.build());

  4. How to open a web URL on notification click in Android? Description: Open a web URL when a notification is clicked using PendingIntent in Android.

    // Create an Intent for opening a web URL Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("https://www.example.com")); // Create a PendingIntent for the notification PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); // Build the notification NotificationCompat.Builder builder = new NotificationCompat.Builder(context, channelId) .setSmallIcon(R.drawable.notification_icon) .setContentTitle("Notification Title") .setContentText("Notification Text") .setContentIntent(pendingIntent) .setAutoCancel(true); // Show the notification NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context); notificationManager.notify(notificationId, builder.build());

  5. Android open dialog on notification click using PendingIntent Description: Open a dialog or popup when a notification is clicked using PendingIntent in Android.

    // Create an Intent for showing a dialog Intent intent = new Intent(context, DialogActivity.class); // Create a PendingIntent for the notification PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); // Build the notification NotificationCompat.Builder builder = new NotificationCompat.Builder(context, channelId) .setSmallIcon(R.drawable.notification_icon) .setContentTitle("Notification Title") .setContentText("Notification Text") .setContentIntent(pendingIntent) .setAutoCancel(true); // Show the notification NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context); notificationManager.notify(notificationId, builder.build());

  6. How to open a specific activity on notification click in Android without Intent flags? Description: Open a specific activity when a notification is clicked in Android without using Intent flags.

    // Create an Intent for the activity to open Intent intent = new Intent(context, MainActivity.class); // Create a PendingIntent for the notification PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT); // Build the notification NotificationCompat.Builder builder = new NotificationCompat.Builder(context, channelId) .setSmallIcon(R.drawable.notification_icon) .setContentTitle("Notification Title") .setContentText("Notification Text") .setContentIntent(pendingIntent) .setAutoCancel(true); // Show the notification NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context); notificationManager.notify(notificationId, builder.build());

  7. Android open fragment with arguments on notification click using PendingIntent Description: Pass arguments to a fragment and open it when a notification is clicked using PendingIntent in Android.

    // Create an Intent for the activity containing the fragment Intent intent = new Intent(context, MainActivity.class); intent.putExtra("fragmentArgument", "argument_value"); // Create a PendingIntent for the notification PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); // Build the notification NotificationCompat.Builder builder = new NotificationCompat.Builder(context, channelId) .setSmallIcon(R.drawable.notification_icon) .setContentTitle("Notification Title") .setContentText("Notification Text") .setContentIntent(pendingIntent) .setAutoCancel(true); // Show the notification NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context); notificationManager.notify(notificationId, builder.build());

  8. How to open a specific activity with data on notification click in Android? Description: Pass data to an activity and open it when a notification is clicked using PendingIntent in Android.

    // Create an Intent for the activity to open with data Intent intent = new Intent(context, MainActivity.class); intent.putExtra("dataKey", "data_value"); // Create a PendingIntent for the notification PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); // Build the notification NotificationCompat.Builder builder = new NotificationCompat.Builder(context, channelId) .setSmallIcon(R.drawable.notification_icon) .setContentTitle("Notification Title") .setContentText("Notification Text") .setContentIntent(pendingIntent) .setAutoCancel(true); // Show the notification NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context); notificationManager.notify(notificationId, builder.build());

  9. Android open activity with specific action on notification click using PendingIntent Description: Perform a specific action in an activity when a notification is clicked using PendingIntent in Android.

    // Create an Intent with a custom action for the activity to perform Intent intent = new Intent(context, MainActivity.class); intent.setAction("com.example.ACTION_NOTIFICATION_CLICK"); // Create a PendingIntent for the notification PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); // Build the notification NotificationCompat.Builder builder = new NotificationCompat.Builder(context, channelId) .setSmallIcon(R.drawable.notification_icon) .setContentTitle("Notification Title") .setContentText("Notification Text") .setContentIntent(pendingIntent) .setAutoCancel(true); // Show the notification NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context); notificationManager.notify(notificationId, builder.build());

  10. How to open a specific activity with flags on notification click in Android? Description: Open an activity with specific flags when a notification is clicked using PendingIntent in Android.

    // Create an Intent for the activity to open with flags Intent intent = new Intent(context, MainActivity.class); intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP); // Create a PendingIntent for the notification PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); // Build the notification NotificationCompat.Builder builder = new NotificationCompat.Builder(context, channelId) .setSmallIcon(R.drawable.notification_icon) .setContentTitle("Notification Title") .setContentText("Notification Text") .setContentIntent(pendingIntent) .setAutoCancel(true); // Show the notification NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context); notificationManager.notify(notificationId, builder.build());

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