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import com.google.firebase.messaging.FirebaseMessagingService;
import com.google.firebase.messaging.RemoteMessage;
import com.netcore.android.smartechpush.SmartPush;
import org.json.JSONException;
import org.json.JSONObject;
import java.lang.ref.WeakReference;
import android.content.Context;
import androidx.annotation.NonNull;






public class FCM_Service extends FirebaseMessagingService {

@Override
public void onNewToken(@NonNull String token) {
        super.onNewToken(token);
        SmartPush.getInstance(new WeakReference<Context>(this)).setDevicePushToken(token);

        //<Your code>
        }

@Override
public void onMessageReceived(@NonNull RemoteMessage remoteMessage) {
        super.onMessageReceived(remoteMessage);
    boolean pushFromSmartPush = false;
    try {
        pushFromSmartPush = SmartPush.getInstance(new WeakReference<Context>(this)).isNotificationFromSmartech(new JSONObject(remoteMessage.getData().toString()));
    } catch (JSONException e) {
        throw new RuntimeException(e);
    }
    if(pushFromSmartPush){
        SmartPush.getInstance(new WeakReference<>(getApplicationContext())).handlePushNotification(remoteMessage.getData().toString());
        } else {
        // Notification received from other sources
        }
        }
        }




dependies:
pease add project level build.gralde file

dependencies {
      
        classpath 'com.google.gms:google-services:4.3.15'

    }
 

please add in android(app level build.gradleI file
  apply plugin: 'com.google.gms.google-services'
dependencies {
        
 implementation platform('com.google.firebase:firebase-bom:28.4.2')
  implementation 'com.google.firebase:firebase-messaging'
    }
 




 

</manifest>
<application>

<service
            android:name=".FCM_Service"
            android:exported="true">
            <intent-filter>
                <action android:name="com.google.firebase.MESSAGING_EVENT" />
            </intent-filter>
        </service>


    </application>

</manifest>