Libraries for online services make it possible to easily integrate cloud storage or online communication services in your app. These SDKs let developers store content in either Dropbox or Box or use the Amazon AWS services. Integrating communication services like Twitter is also easier with any of the Twitter SDKs.
This overview of online services SDKs provides you with the most-used and well-known Online services libraries in Android apps including Google Cloud messaging, Firebase, Twitter kit, Amazon AWS SDK for Android and Dropbox API.
It is now possible to purchase a Top 500 list of apps that integrated a specific SDK. For more information click on the specific SDK and click on the "Buy" button.
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