이전에 GCM은 상당히 복잡했지만 지금은 너무나 간편해졌다.

- 2019.8.21 최신 업데이트

gradle(app) 추가

implementation 'com.google.firebase:firebase-messaging:19.0.1'
 

Menifest 추가

<service
        android:name=".java.MyFirebaseMessagingService"
        android:exported="false">
    <intent-filter>
        <action android:name="com.google.firebase.MESSAGING_EVENT" />
    </intent-filter>
</service>
 

Service Class 생성
 
class MyFirebaseMessagingService : FirebaseMessagingService() {

    override fun onNewToken(token: String?) {
        // Get updated InstanceID token.
        val refreshedToken = FirebaseInstanceId.getInstance().token
        Log.d(TAG, "Refreshed token: " + refreshedToken!!)

        //관리하는 DB에 Token 추가
    }


    override fun onMessageReceived(remoteMessage: RemoteMessage?) {
        Log.d(TAG, "From: " + remoteMessage!!.from!!)
    }

    companion object {
        private val TAG = "MyFirebaseMsgService"
    }
}

     끝!

Android -> S3

get Android key

https://console.aws.amazon.com/cognito/home 

Manage identity -> insert identity pool name -> enable access to unauthorized identities -> get aws credentials

Policy setting

http://awspolicygen.s3.amazonaws.com/policygen.html

select type: S3 bucket policy

Principal: *

Actions: get object

Arn:aws:s3:::(bucketname)/*

Statement 복사 S3 setting -> 붙여넣기

Android pro guard

# Class names are needed in reflection

-keepnames class com.amazonaws.**

-keepnames class com.amazon.**

# Request handlers defined in request.handlers

-keep class com.amazonaws.services.**.*Handler

# The following are referenced but aren't required to run

-dontwarn com.fasterxml.jackson.**

-dontwarn org.apache.commons.logging.**

# Android 6.0 release removes support for the Apache HTTP client

-dontwarn org.apache.http.**

# The SDK has several references of Apache HTTP client

-dontwarn com.amazonaws.http.**

-dontwarn com.amazonaws.metrics.**