Android 알림 받는 기능

FCM(Firebase Cloud Messaging) Librar를 이용한 알림 기능입니다.

 

Android Studio Project 생성합니다.

 

Firebase 사이트 들어가 세팅작업하기

https://console.firebase.google.com/?pli=1

로그인 - Google 계정

 

Firebase Project 생성하고 프로젝트에서 앱 추가를 하면 위에 이미지 처럼 나옵니다. 

Android 패키지 이름은 Android Studio에 만든 패키지명과 동일하게 해야 합니다.

디버그 서명 인증서 SHA-1는 Android Studio 우측 Gradle 탭에 Tasks>android>signigReport 클릭하면 있습니다.

 

Firebase app 추가까지 하면 google-services.json 파일을 제공하는데 이 json 파일을 프로젝트 최상단에 넣어주시면 됩니다. (JSON 파일에 api 등 있음)

 

Android 기본 Setting은 Firebase Reference에 있습니다. (대충 적는다는 의미)

 

안드로이드 targetSdkVersion 31 (12)로 하면 뭔가 바껴서 에러남. PendingIntent 문제 발생!!

 

build.gradle : 프로젝트

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:4.1.3"
        classpath 'com.google.gms:google-services:4.3.10'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

 

build.gradle : 모듈 

plugins {
    id 'com.android.application'
    id 'com.google.gms.google-services'
}

android {
    compileSdkVersion 31
//    buildToolsVersion "30.0.3"
    buildToolsVersion "28.0.0"

    defaultConfig {
        applicationId "com.example.fcmandroid"
        minSdkVersion 23
//        targetSdkVersion 31
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {
    implementation 'com.google.firebase:firebase-messaging:17.3.4'
    implementation 'com.google.firebase:firebase-core:16.0.4'
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.fcmandroid">

    <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/Theme.FCMAndroid">
        <activity android:name=".MainActivity" android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
		
        <!-- app에 알림 받는 설정 -->
        <service android:name=".MyFirebaseMessagingService" android:exported="false">
            <intent-filter>
                <action android:name="com.google.firebase.MESSAGING_EVENT"/>
            </intent-filter>
        </service>


    </application>

</manifest>

 

MyFirbaseMessagingService

package com.example.fcmandroid;

import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Build;
import android.os.Looper;
import android.util.Log;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.core.app.NotificationCompat;

import com.google.firebase.messaging.FirebaseMessagingService;
import com.google.firebase.messaging.RemoteMessage;

public class MyFirebaseMessagingService extends FirebaseMessagingService {

        @Override
        public void onNewToken(String s) {
            super.onNewToken(s);
            Log.e("Firebase", "FirebaseInstanceIDService : " + s);
        }

        /**
         * 메시지 수신받는 메소드
         * @param msg
         */
        @Override
        public void onMessageReceived(RemoteMessage msg) {
            Log.d("### msg : ", msg.getNotification().getTitle());
       
            if(msg.getData().isEmpty()){
                sendNotification(msg.getNotification().getBody());
            }else
                sendNotification(msg.getData().get("content"));

        }


    private void sendNotification(String messageBody) {
        Intent intent = new Intent(this, MainActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
                PendingIntent.FLAG_ONE_SHOT);

        String channelId = getString(R.string.default_notification_channel_id);
        Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
        NotificationCompat.Builder notificationBuilder =
                new NotificationCompat.Builder(this, channelId)
                        .setSmallIcon(R.drawable.ic_stat_ic_notification)
                        .setContentTitle(getString(R.string.fcm_message))
                        .setContentText(messageBody)
                        .setAutoCancel(true)
                        .setSound(defaultSoundUri)
                        .setContentIntent(pendingIntent);

        NotificationManager notificationManager =
                (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

        // Since android Oreo notification channel is needed.
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            NotificationChannel channel = new NotificationChannel(channelId,
                    "Channel human readable title",
                    NotificationManager.IMPORTANCE_DEFAULT);
            notificationManager.createNotificationChannel(channel);
        }

        notificationManager.notify(0 /* ID of notification */, notificationBuilder.build());
    }
}

 

onMessageReceived method가 Firebase Server에서 메세지가 요청 들어오면 작동하는 메소드이다.

 

https://github.com/firebase/quickstart-android/blob/master/messaging/app/src/main/java/com/google/firebase/quickstart/fcm/java/MyFirebaseMessagingService.java

GitHub - firebase/quickstart-android: Firebase Quickstart Samples for Android

 

알림 테스트는 Firebase 사이트에 참여에 Cloud Messaging에서 할 수 있습니다

테스트 메세지 전송을 위해 token 필요함 

https://firebase.google.com/docs/cloud-messaging/android/first-message?authuser=0&hl=ko#retrieve-the-current-registration-token