It's time to further improve our application and introduce you to Android content providers. Content providers are one of the top power features Android Framework has to offer. What is the purpose of content providers? As its name suggests, content providers have the purpose of managing access to data stored by our application or stored by other applications. They provide a mechanism for sharing the data with other applications and provide a security mechanism for data access, that may or may not be from the same process.
Take a look at the following illustration displaying how content provider can manage access to shared storage:
We have a plan to share Notes and the TODOs data with other applications. Thanks to the abstraction layer content providers offers, it's easy to make the changes in the storage implementation layer without affecting the upper layers. Because of this, you can use content providers even if you do not plan to share any data with other applications...