Google Cloud Messaging for Android (GCM) is a service that helps developers send data from servers to their Android applications on Android devices. The service provides a simple, lightweight mechanism that servers can use to tell mobile applications to contact the server directly, to fetch updated application or user data. The GCM service handles all aspects of queueing of messages and delivery to the target Android application running on the target device.

This project contains sample code and legacy client libraries for interfacing with GCM. Newer applications should instead include the Google Play Services library via their Gradle configuration:

dependencies {
  compile "com.google.android.gms:play-services:3.1.+"
}

Information on GCM, including an overview and integration instructions, can be found on the Android Developers website:

http://developer.android.com/guide/google/gcm/index.html

• Google+ Community: https://plus.sandbox.google.com/communities/105153134372062985968
• Stack Overflow: http://stackoverflow.com/questions/tagged/android-gcm

If you've found an error in this project's code, please file an issue: https://github.com/google/gcm/issues

Patches are encouraged, and may be submitted by forking this project and submitting a pull request through GitHub. See CONTRIBUTING.md for more details.

Copyright 2015 Google, Inc.

Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.