fcm-sender-java is libary for sending notification to FCM server.
<repositories>
<repository>
<snapshots>
<enabled>false</enabled>
</snapshots>
<id>bintray-enzinier-fcm-sender-java</id>
<name>bintray</name>
<url>http://dl.bintray.com/enzinier/fcm-sender-java</url>
</repository>
</repositories>
<dependency>
<groupId>com.illicis</groupId>
<artifactId>fcm-sender-java</artifactId>
<version>0.0.1</version>
</dependency>compile 'com.illicis:fcm-sender-java:0.0.1'DownstreamHttpNotification downstreamHttpNotificationAndroid =
DownstreamHttpNotificationAndroid.builder()
.setTitle("Hello")
.setBody("This is test notification.")
.build();
DownstreamHttpMessages downstreamHttpMessages =
new DownstreamHttpMessages(registrationIdForTest, null)
.setContentAvailable(true)
.setNotification(downstreamHttpNotificationAndroid)
.setData(this.getDownstreamHttpData())
.setDryRun(false);
FcmSender fcmSender = new FcmSender("Your Server Key");
DownstreamHttpResponse downstreamHttpResponse = fcmSender.sendNotification(downstreamHttpMessages);You can find server key from setting of firebase console. (Project Setting > Cloud Messaging) DownstreamHttpData is just interface for getting common parameter. Therefore you should write code to include your own data implement DownstreamHttpData.