ContentProvidersPlease download and open: http://goo.gl/aDmGsR

ContentProvider Manages data Can use almost any storage option

SQLite File API …

Provides consistent interface (CRUD) Can be restricted with permissions

extends ContentProvider class

Use Case

Objects

Storage

Interactions

ContentProvider

Registers

ContentResolverContentResolver

CRUD

CRUD

CRUD

Your AppOther Apps

Platform

CRUDMethod

Usage

insert Inserts one object. The URI must be directory-based

query Queries for all objects that fit the URI.

update Updates one or all object(s)

delete Deletes the object(s) for the URI provided.

Insert (Create)Type Name Usage

URI uri The URI of the object(s) to access.

ContentValues values The values for the object to add.

Query (Read)Type Name Usage

URI uri The URI of the object(s) to access.

String[]

projection This String array indicates which columns/attributes of the objects you want to access

String selection With this argument you can determine which records to return

String[]

selectionArgs

The binding parameters to the previous selection argument

String sortOrder If the result should be ordered you must use this argument to determine the sort order

Query (sample)

Update(Update)Type Name Usage

URI uri The URI of the object(s) to access.

ContentValues values The values for the object to add.

String selection With this argument you can determine which records to affect

String[] selectionArgs

The binding parameters to the previous selection argument

Delete(Delete)Type Name Usage

URI uri The URI of the object(s) to access.

String selection With this argument you can determine which records to affect

String[] selectionArgs

The binding parameters to the previous selection argument

Use Case (people)

URI content://authority/path/id

authority: is Java namespace of the content provider implementation. (fully qualified Java package name)

path: is the virtual directory within the provider that identifies the kind of data being requested.

id: is optional part that specifies the primary key of a record being requested. We can omit this part to request all records.

URI (sample) authority: our authority is…

com.example.rememberme.provider.PersonContentProvider

path: using table nameperson

UriMatcher Helper class to match URIs to a specific

integer codes.

UriMatcher (sample)

MIME Types Used to determine supported object

types Prefixed with:

vnd.android.cursor.item Single item

vnd.android.cursor.dir List of items

MIME Types (sample)

Let’s get coding…