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By using the content provider, data can be shared across applications. The content provider is a set of data wrapped up in a custom API to read and write. Applications/Processes have to register themselves as a provider of data. Other applications can request Android to read/write that data through a fixed API. Content provider API has methods to perform operations(CRUD) on data. Contacts are the best example – that exposes user information to other applications, Media store-Allows other applications to access, store media files. There is some standard methods – insert(), query(), update(), delete(), to access application data. So it is easy to implement a content provider. We need to assign a URI to each Content Provider, starting with “content://” and that will be recognized by applications.
1. Create a class for ContentProvider. 2. Define content URI 3. Implement all the unimplemented methods. insert(), update(), query(), delete(), getType(). 4. Declare the content provider in AndroidManifest.xml
1. content:// – The content provider URIs should start with this value. 2. ‘authority’ – This is Java namespace of the content provider implementation passes the Java package name. 3. ‘path’ – This is a virtual directory within the provider that identifies, what kind of data being requested. 4. ‘id’ – This is an optional part that specifies the primary key of a record being requested. This part can be ignored to access all data.
Add data: We need to override insert() method. If data inserted successful, it will return the URI value with the associated with ID. For example: If we passed – content://packageName/sample Method will return content://packageName/sample/1
Updating data: update() method of the ContentProvider is used to update records. This method will return the number of rows updated.
Deleting data: delete() method of the ContentProvider will return the number of records deleted.
We need to register the content providers in the AndroidManifest.xml.
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