Tích hợp Push Notification trên Android

buildscript {
repositories {
      ...
      	google()  // Google's Maven repository
      	mavenCentral()  // Maven Central repository
}

    	dependencies {
...
// Add the dependency for the Google services Gradle plugin
classpath 'com.google.gms:google-services:4.3.15'
}
}

allprojects {
...

repositories {
    		// Make sure that you have the following two repositories
google()  // Google's Maven repository
mavenCentral()  // Maven Central repository
}
}
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plugins {
id 'com.android.application'
// Add the Google services Gradle plugin
id 'com.google.gms.google-services'
...
}

dependencies {
...
// Import the Firebase BoM
implementation platform('com.google.firebase:firebase-bom:31.4.0')
implementation 'com.google.firebase:firebase-messaging'
}
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FirebaseMessaging.getInstance().getToken().addOnCompleteListener(task -> {
if (task.isSuccessful()){
String token = task.getResult();
stringeeClient.registerPushToken(token, new StatusListener() {
    		@Override
    		public void onSuccess() {
    		}

    		@Override
    		public void onError(StringeeError error) {
    		}
});
}
});
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public class MyFirebaseMessagingService extends FirebaseMessagingService {
@Override
public void onMessageReceived(@NonNull RemoteMessage message) {
super.onMessageReceived(message);
}
}
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<service
android:name=".MyFirebaseMessagingService"
   	android:enabled="true"
   	android:exported="false">
   	<intent-filter>
       	<action android:name="com.google.firebase.MESSAGING_EVENT" />
   	</intent-filter>
</service>
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@Override
public void onMessageReceived(@NonNull RemoteMessage message) {
super.onMessageReceived(message);
if (message.getData().size() > 0) {
String pushFromStringee = message.getData().get("stringeePushNotification");
if (pushFromStringee != null) {
String data = message.getData().get("data");
if (data != null) {
try {
JSONObject jsonObject = new JSONObject(data);
JSONObject fromObject = jsonObject.optJSONObject("from");
String from = fromObject.optString("alias", "");
if (from.length() == 0) {
from = fromObject.optString("from");
}
String callStatus = jsonObject.optString("callStatus", "");
if (callStatus.length() > 0) {
if (callStatus.equals("started")) {
showNotification(from);
}
if (callStatus.equals("ended") || callStatus.equals("answered")) {
cancelNotification(this);
}
}
               		} catch (JSONException e) {
                   		throw new RuntimeException(e);
               		}
           		}
       	}
   	}
}
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int notificationId = 0; //id của notification
...
private void showNotification(String from) {
NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
   	//Tạo notification channel đối với android 8 trở lên
   	if (VERSION.SDK_INT >= VERSION_CODES.O) {
       	NotificationChannel notificationChannel = new
NotificationChannel("Channel id", "Channel name", NotificationManager.IMPORTANCE_HIGH);
notificationChannel.setDescription("Channel description");
notificationManager.createNotificationChannel(notificationChannel);
   	}
	//Tạo Intent để mở màn hình MainActivity khi click vào notification
Intent intent = new Intent(this, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_IMMUTABLE);
NotificationCompat.Builder builder = new NotificationCompat.Builder(this, "Channel id");
builder.setContentTitle("Incoming call");
builder.setContentText("Incoming call from: " + from);
builder.setSmallIcon(mipmap.ic_launcher);
builder.setOngoing(true);
builder.setPriority(NotificationCompat.PRIORITY_HIGH);
builder.setCategory(NotificationCompat.CATEGORY_CALL);
builder.setContentIntent(pendingIntent);
builder.setShowWhen(false);
//
notificationManager.notify(notificationId, builder.build());
}
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public static void cancelNotification(Context context) {
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
   	notificationManager.cancel(notificationId);
}
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