Reference: firebase.google.com/docs/cloud-…

1, the introduction of

Speaking of Firebase Cloud Messaging (referred to as FCM), most people may not know it, but speaking of GCM (Google Cloud Messaging), surely Android developers are aware of it. Although the current Domestic Android devices have neutered Google services, resulting in GCM can not be used normally. But GCM still has a reputation.

2. Working principle

3, the status quo

Because Google blocked access at home, most of the domestic mobile phone are castrated Google services, resulting in the GCM is not available, each big manufacturers to maintain their own software is active on android devices, to facilitate the various messages pushed to the android devices, leading people to impression of android is caton and power consumption, This has a lot to do with the unavailability of GCM.

Due to the business needs of the company, we need to access GCM, search the documents on Google, and find that the official no longer recommends developers to use GCM, but recommends a more powerful FCM, which can be considered as an improved or enhanced version of GCM.

Ii. Preparation for access

1. Develop equipment

An Android phone with Google servers

2. Development environment

3. Console Settings

(1) Create an application

(2) Fill in the project name

In the window that pops up, fill in the project name and clickCreate a project

(3) Integrate Firebase into Android

inOverviewClick on the optionsAdd Firebase to your Android application

(4) Fill in the package name and SHA1

Enter the project’s value in the pop-up windowThe package nameandsha1And then clickAdd application

(5) Download Google-services. json

Click after the creation is successfulDownload google-services.json, then switch the Project to the Project view and place the downloaded files in the root directory of your app

Three, Android terminal integration FCM

Reference: firebase.google.com/docs/cloud-…

1. Modify gradle files

(1) Project-level build.gradle

Add the following code to the Dependencies node in the build.gradle file at the project level

The classpath 'com. Google. GMS: Google - services: 3.0.0'Copy the code

(2) Build. Gradle

The compile 'com. Google. Firebase: firebase - messaging: 10.0.2'Copy the code

apply plugin: 'com.google.gms.google-services'Copy the code

2, create MyFirebaseInstanceIDService

In the project of new MyFirebaseInstanceIDService, inherit FirebaseInstanceIdService, and write down the following method

@Override
public void onTokenRefresh() {
    super.onTokenRefresh();
    String refreshedToken = FirebaseInstanceId.getInstance().getToken();
    Log.d(TAG, "Refreshed token: " + refreshedToken);
}Copy the code

Register the Service in the manifest file

< service android:name=".MyFirebaseInstanceIDService">
    < intent-filter>
        < action android:name="com.google.firebase.INSTANCE_ID_EVENT"/>
    < /intent-filter>
< /service>Copy the code

3, MyFirebaseMessagingService

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    super.onMessageReceived(remoteMessage);
    Log.d(TAG, "From: " + remoteMessage.getFrom());
    // Check if message contains a data payload.
    if (remoteMessage.getData().size() > 0) {
        Log.d(TAG, "Message data payload: " + remoteMessage.getData());
    }
    // Check if message contains a notification payload.
    if (remoteMessage.getNotification() != null) {
        Log.d(TAG, "Message Notification Body: " + remoteMessage.getNotification().getBody());
    }
}Copy the code

< service
    android:name=".MyFirebaseMessagingService">
    < intent-filter>
        < action android:name="com.google.firebase.MESSAGING_EVENT"/>
    < /intent-filter>
< /service>Copy the code

4. Obtain the token

In a project, the following code can be used to obtain the token of the device and send the token to the server so that the server can push the message of the specified device

FirebaseInstanceId.getInstance().getToken();Copy the code

5. Set the icon and background color

< meta-data
    android:name="com.google.firebase.messaging.default_notification_icon"
    android:resource="@drawable/icon_logo" />
< meta-data
    android:name="com.google.firebase.messaging.default_notification_color"
    android:resource="@color/colorPrimary" />
Copy the code

Send a message

1. The console sends messages

2. Send a message by sending a POST request

(1) Request address

(2) Request header

The HTTP header must contain two parts

Content-Type:application/json

Authorization:key=YOUR_SERVER_KEY

Serverkey can be obtained from console Settings – project Settings – cloud messaging – serverkey

(3) Send content

If you send a notification message, you send something similar to the code below

{ "notification": {
    "title": "Portugal vs. Denmark",
    "text": "5 to 1"
  },
  "to" : "bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1..."
}Copy the code

The value of to is the token of the device

More parameter Settings can reference: firebase.google.com/docs/cloud-…