Content package - Mobile computing
- 1. Content Provider & Resolver By Priyanka Rana
- 2. • Two classes in the package help enforce this requirement: • ContentResolver & ContentProvider • Contains classes for accessing and publishing data. • Applications are not allowed direct access to other application’s internal data. • The Android framework enforces a robust and secure data sharing model. The android.content Package
- 5. What is the Content Resolver? • The Content Resolver is the single, global instance in your application that provides access to your (and other applications’) content providers. • The Content Resolver behaves exactly as its name implies: it accepts requests from clients, and resolves these requests by directing them to the content provider with a distinct authority. • To do this, the Content Resolver stores a mapping from authorities to Content Providers. This design is important, as it allows a simple and secure means of accessing other applications’ Content Providers. • The Content Resolver includes the CRUD (create, read, update, delete) methods corresponding to the abstract methods (insert, query, update, delete) in the Content Provider class. • The Content Resolver does not know the implementation of the Content Providers it is interacting with (nor does it need to know); each method is passed an URI that specifies the Content Provider to interact with.
- 7. What is a Content Provider? • Whereas the Content Resolver provides an abstraction from the application’s Content Providers, Content Providers provide an abstraction from the underlying data source (i.e. a SQLite database). • They provide mechanisms for defining data security (i.e. by enforcing read/write permissions) and offer a standard interface that connects data in one process with code running in another process.
- 10. Cursor cursor = getContentResolver().query(ContactsContract.Contacts.CONT ENT_URI,null, selection, selectionArgs, null); This call invokes the Content Resolver’s query method.