How to detect a new Android notification?

This example demonstrate about How to detect a new Android notification
Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.
Step 2 − Add the following code to src/MyListener.java
public interface MyListener {
   void setValue (String packageName) ;
}
Step 3 − Add the following code to src/MyListener.java
package app.tutorialspoint.com.notifyme ;
import android.content.Context ;
import android.service.notification.NotificationListenerService ;
import android.service.notification.StatusBarNotification ;
import android.util.Log ;
public class NotificationService extends NotificationListenerService {
   private String TAG = this .getClass().getSimpleName() ;
   Context context ;
   static MyListener myListener ;
   @Override
   public void onCreate () {
      super .onCreate() ;
      context = getApplicationContext() ;
   }
   @Override
   public void onNotificationPosted (StatusBarNotification sbn) {
      Log. i ( TAG , "********** onNotificationPosted" ) ;
      Log. i ( TAG , "ID :" + sbn.getId() + " \t " + sbn.getNotification(). tickerText + " \t " + sbn.getPackageName()) ;
      myListener .setValue( "Post: " + sbn.getPackageName()) ;
   }
   @Override
   public void onNotificationRemoved (StatusBarNotification sbn) {
      Log. i ( TAG , "********** onNotificationRemoved" ) ;
      Log. i ( TAG , "ID :" + sbn.getId() + " \t " + sbn.getNotification(). tickerText + " \t " + sbn.getPackageName()) ;
      myListener .setValue( "Remove: " + sbn.getPackageName()) ;
   }
   public void setListener (MyListener myListener) {
      NotificationService. myListener = myListener ;
   }
}
Step 4 − Add the following code to res/menu/menu_main.xml.
<? xml version = "1.0" encoding = "utf-8" ?>
<menu xmlns: android = "http://schemas.android.com/apk/res/android"
   xmlns: app = "http://schemas.android.com/apk/res-auto"
   xmlns: tools = "http://schemas.android.com/tools"
   tools :context = ".MainActivity" >
   <item
      android :id = "@+id/action_settings"
      android :orderInCategory = "100"
      android :title = "Settings"
      app :showAsAction = "never" />
</menu>
Step 5 − Add the following code to res/layout/activity_main.xml.
<? xml version = "1.0" encoding = "utf-8" ?>
<RelativeLayout xmlns: android = "http://schemas.android.com/apk/res/android"
   xmlns: tools = "http://schemas.android.com/tools"
   android :layout_width = "match_parent"
   android :layout_height = "match_parent"
   android :padding = "16dp"
   tools :context = ".MainActivity" >
   <Button
      android :id = "@+id/btnCreateNotification"
      android :layout_width = "wrap_content"
      android :layout_height = "wrap_content"
      android :layout_alignParentStart = "true"
      android :layout_alignParentTop = "true"
      android :layout_alignParentEnd = "true"
      android :text = "Create Notification" />
   <ScrollView
      android :layout_width = "match_parent"
      android :layout_height = "match_parent"
      android :layout_below = "@+id/btnCreateNotification"
      android :layout_alignStart = "@+id/btnCreateNotification"
      android :layout_alignEnd = "@+id/btnCreateNotification"
      android :layout_alignParentBottom = "true" >
      <TextView
         android :id= "@+id/textView"
         android :layout_width= "match_parent"
         android :layout_height= "wrap_content"
         android :text= "NotificationListenerService Example"
         android :textAppearance= "?android:attr/textAppearanceMedium" />
   </ScrollView>
</RelativeLayout>
Step 6 − Add the following code to src/MainActivity.java
package app.tutorialspoint.com.notifyme ;
import android.app.NotificationChannel ;
import android.app.NotificationManager ;
import android.content.Intent ;
import android.os.Bundle ;
import android.support.v4.app.NotificationCompat ;
import android.support.v7.app.AppCompatActivity ;
import android.view.Menu ;
import android.view.MenuItem ;
import android.view.View ;
import android.widget.Button ;
import android.widget.TextView ;
public class MainActivity extends AppCompatActivity implements MyListener {
   private TextView txtView ;
   public static final String NOTIFICATION_CHANNEL_ID = "10001" ;
   private final static String default_notification_channel_id = "default" ;
   @Override
   protected void onCreate (Bundle savedInstanceState) {
      super .onCreate(savedInstanceState) ;
      setContentView(R.layout. activity_main ) ;
      new NotificationService().setListener( this ) ;
      txtView = findViewById(R.id. textView ) ;
      Button btnCreateNotification = findViewById(R.id. btnCreateNotification ) ;
      btnCreateNotification.setOnClickListener( new View.OnClickListener() {
         @Override
         public void onClick (View v) {
            NotificationManager mNotificationManager = (NotificationManager) getSystemService( NOTIFICATION_SERVICE ) ;
            NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(MainActivity. this, default_notification_channel_id ) ;
            mBuilder.setContentTitle( "My Notification" ) ;
            mBuilder.setContentText( "Notification Listener Service Example" ) ;
            mBuilder.setTicker( "Notification Listener Service Example" ) ;
            mBuilder.setSmallIcon(R.drawable. ic_launcher_foreground ) ;
            mBuilder.setAutoCancel( true ) ;
            if (android.os.Build.VERSION. SDK_INT >= android.os.Build.VERSION_CODES. O ) {
               int importance = NotificationManager. IMPORTANCE_HIGH ;
               NotificationChannel notificationChannel = new NotificationChannel( NOTIFICATION_CHANNEL_ID , "NOTIFICATION_CHANNEL_NAME" , importance) ;
               mBuilder.setChannelId( NOTIFICATION_CHANNEL_ID ) ;
               assert mNotificationManager != null;
               mNotificationManager.createNotificationChannel(notificationChannel) ;
            }
            assert mNotificationManager != null;
            mNotificationManager.notify(( int ) System. currentTimeMillis () , mBuilder.build()) ;
         }
      }) ;
   }
   @Override
   public boolean onCreateOptionsMenu (Menu menu) {
      getMenuInflater().inflate(R.menu. menu_main , menu) ; //Menu Resource, Menu
      return true;
   }
   @Override
   public boolean onOptionsItemSelected (MenuItem item) {
      switch (item.getItemId()) {
         case R.id. action_settings :
            Intent intent = new Intent("android.settings.ACTION_NOTIFICATION_LISTENER_SETTINGS" ) ;
            startActivity(intent) ;
            return true;
         default :
            return super .onOptionsItemSelected(item) ;
      }
   }
   @Override
   public void setValue (String packageName) {
      txtView .append( " \n " + packageName) ;
   }
}
Step 7 − Add the following code to AndroidManifest.xml
<? xml version = "1.0" encoding = "utf-8" ?>
<manifest xmlns: android = "http://schemas.android.com/apk/res/android"
   package = "app.tutorialspoint.com.notifyme" >
   <uses-permission android :name = "android.permission.VIBRATE" />
   <application
      android :allowBackup = "true"
      android :icon = "@mipmap/ic_launcher"
      android :label = "@string/app_name"
      android :roundIcon = "@mipmap/ic_launcher_round"
      android :supportsRtl = "true"
      android :theme = "@style/AppTheme" >
      <activity android :name = ".MainActivity" >
         <intent-filter>
            <action android :name = "android.intent.action.MAIN" />
            <category android :name = "android.intent.category.LAUNCHER" />
         </intent-filter>
      </activity>
      <service
         android :name = ".NotificationService"
         android :label = "@string/app_name"
         android :permission = "android.permission.BIND_NOTIFICATION_LISTENER_SERVICE" >
         <intent-filter>
            <action android :name = "android.service.notification.NotificationListenerService" />
         </intent-filter>
      </service>
   </application>
</manifest>
Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click Run  icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −
Click  here  to download the project code