DocumentsProvider


public abstract class DocumentsProvider
extends ContentProvider

java.lang.Object
   ↳ android.content.ContentProvider
     ↳ android.provider.DocumentsProvider


Base class for a document provider. A document provider offers read and write access to durable files, such as files stored on a local disk, or files in a cloud storage service. To create a document provider, extend this class, implement the abstract methods, and add it to your manifest like this:

<manifest>
    ...
    <application>
        ...
        <provider
            android:name="com.example.MyCloudProvider"
            android:authorities="com.example.mycloudprovider"
            android:exported="true"
            android:grantUriPermissions="true"
            android:permission="android.permission.MANAGE_DOCUMENTS"
            android:enabled="@bool/isAtLeastKitKat">
            <intent-filter>
                <action android:name="android.content.action.DOCUMENTS_PROVIDER" />
            </intent-filter>
        </provider>
        ...
    </application>
</manifest>

When defining your provider, you must protect it with Manifest.permission.MANAGE_DOCUMENTS, which is a permission only the system can obtain. Applications cannot use a documents provider directly; they must go through Intent#ACTION_OPEN_DOCUMENT or Intent#ACTION_CREATE_DOCUMENT which requires a user to actively navigate and select documents. When a user selects documents through that UI, the system issues narrow URI permission grants to the requesting application.

Documents

A document can be either an openable stream (with a specific MIME type), or a directory containing additional documents (with the Document#MIME_TYPE_DIR MIME type). Each directory represents the top of a subtree containing zero or more documents, which can recursively contain even more documents and directories.

Each document can have different capabilities, as described by Document#COLUMN_FLAGS. For example, if a document can be represented as a thumbnail, your provider can set Document#FLAG_SUPPORTS_THUMBNAIL and implement openDocumentThumbnail(java.lang.String, android.graphics.Point, android.os.CancellationSignal) to return that thumbnail.

Each document under a provider is uniquely referenced by its Document#COLUMN_DOCUMENT_ID, which must not change once returned. A single document can be included in multiple directories when responding to queryChildDocuments(java.lang.String, java.lang.String[], java.lang.String). For example, a provider might surface a single photo in multiple locations: once in a directory of geographic locations, and again in a directory of dates.

Roots

All documents are surfaced through one or more "roots." Each root represents the top of a document tree that a user can navigate. For example, a root could represent an account or a physical storage device. Similar to documents, each root can have capabilities expressed through Root#COLUMN_FLAGS.

Summary

Inherited constants

Public constructors

DocumentsProvider()

Public methods

void attachInfo(Context context, ProviderInfo info)

Implementation is provided by the parent class.

Bundle call(String method, String arg, Bundle extras)

Implementation is provided by the parent class.

Uri canonicalize(Uri uri)

Implementation is provided by the parent class.

String copyDocument(String sourceDocumentId, String targetParentDocumentId)

Copy the requested document or a document tree.

String createDocument(String parentDocumentId, String mimeType, String displayName)

Create a new document and return its newly generated Document#COLUMN_DOCUMENT_ID.

IntentSender createWebLinkIntent(String documentId, Bundle options)

Creates an intent sender for a web link, if the document is web linkable.

final int delete(Uri uri, String selection, String[] selectionArgs)

Implementation is provided by the parent class.

void deleteDocument(String documentId)

Delete the requested document.

void ejectRoot(String rootId)

Ejects the root.

DocumentsContract.Path findDocumentPath(String parentDocumentId, String childDocumentId)

Finds the canonical path for the requested document.

Bundle getDocumentMetadata(String documentId)

Returns metadata associated with the document.

String[] getDocumentStreamTypes(String documentId, String mimeTypeFilter)

Return a list of streamable MIME types matching the filter, which can be passed to openTypedDocument(java.lang.String, java.lang.String, android.os.Bundle, android.os.CancellationSignal).

String getDocumentType(String documentId)

Return concrete MIME type of the requested document.

String[] getStreamTypes(Uri uri, String mimeTypeFilter)

Called by a client to determine the types of data streams that this content provider support for the given URI.

final String getType(Uri uri)

Implementation is provided by the parent class.

final String getTypeAnonymous(Uri uri)

An unrestricted version of getType, which does not reveal sensitive information

final Uri insert(Uri uri, ContentValues values)

Implementation is provided by the parent class.

boolean isChildDocument(String parentDocumentId, String documentId)

Test if a document is descendant (child, grandchild, etc) from the given parent.

String moveDocument(String sourceDocumentId, String sourceParentDocumentId, String targetParentDocumentId)

Move the requested document or a document tree.

final AssetFileDescriptor openAssetFile(Uri uri, String mode, CancellationSignal signal)

Implementation is provided by the parent class.

final AssetFileDescriptor openAssetFile(Uri uri, String mode)

Implementation is provided by the parent class.

abstract ParcelFileDescriptor openDocument(String documentId, String mode, CancellationSignal signal)

Open and return the requested document.

AssetFileDescriptor openDocumentThumbnail(String documentId, Point sizeHint, CancellationSignal signal)

Open and return a thumbnail of the requested document.

final ParcelFileDescriptor openFile(Uri uri, String mode, CancellationSignal signal)

Implementation is provided by the parent class.

final ParcelFileDescriptor openFile(Uri uri, String mode)

Implementation is provided by the parent class.

final AssetFileDescriptor openTypedAssetFile(Uri uri, String mimeTypeFilter, Bundle opts)

Implementation is provided by the parent class.

final AssetFileDescriptor openTypedAssetFile(Uri uri, String mimeTypeFilter, Bundle opts, CancellationSignal signal)

Implementation is provided by the parent class.

AssetFileDescriptor openTypedDocument(String documentId, String mimeTypeFilter, Bundle opts, CancellationSignal signal)

Open and return the document in a format matching the specified MIME type filter.

final Cursor query(Uri uri, String[] projection, Bundle queryArgs, CancellationSignal cancellationSignal)

Implementation is provided by the parent class.

Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder, CancellationSignal cancellationSignal)

WARNING: Sub-classes should not override this method.

final Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder)

Implement this to handle query requests from clients.

Cursor queryChildDocuments(String parentDocumentId, String[] projection, Bundle queryArgs)

Override this method to return the children documents contained in the requested directory.

abstract Cursor queryChildDocuments(String parentDocumentId, String[] projection, String sortOrder)

Return the children documents contained in the requested directory.

abstract Cursor queryDocument(String documentId, String[] projection)

Return metadata for the single requested document.

Cursor queryRecentDocuments(String rootId, String[] projection, Bundle queryArgs, CancellationSignal signal)

Return recently modified documents under the requested root.

Cursor queryRecentDocuments(String rootId, String[] projection)

Return recently modified documents under the requested root.

abstract Cursor queryRoots(String[] projection)

Return all roots currently provided.

Cursor querySearchDocuments(String rootId, String[] projection, Bundle queryArgs)

Return documents that match the given query under the requested root.

Cursor querySearchDocuments(String rootId, String query, String[] projection)

Return documents that match the given query under the requested root.

void removeDocument(String documentId, String parentDocumentId)

Removes the requested document or a document tree.

String renameDocument(String documentId, String displayName)

Rename an existing document.

final void revokeDocumentPermission(String documentId)

Revoke any active permission grants for the given Document#COLUMN_DOCUMENT_ID, usually called when a document becomes invalid.

final int update(Uri uri, ContentValues values, String selection, String[] selectionArgs)

Implementation is provided by the parent class.

Inherited methods

Public constructors

DocumentsProvider

public DocumentsProvider ()

Public methods

attachInfo

Added in API level 19
public void attachInfo (Context context, 
                ProviderInfo info)

Implementation is provided by the parent class.

Parameters
context Context: The context this provider is running in

info ProviderInfo: Registered information about this content provider

call

Added in API level 19
public Bundle call (String method, 
                String arg, 
                Bundle extras)

Implementation is provided by the parent class. Can be overridden to provide additional functionality, but subclasses must always call the superclass. If the superclass returns null, the subclass may implement custom behavior.
If you override this method you must call through to the superclass implementation.

Parameters
method String: This value cannot be null.

arg String: This value may be null.

extras Bundle: This value may be null.

Returns
Bundle This value may be null.

canonicalize

Added in API level 19
public Uri canonicalize (Uri uri)

Implementation is provided by the parent class. Can be overridden to provide additional functionality, but subclasses must always call the superclass. If the superclass returns null, the subclass may implement custom behavior.

This is typically used to resolve a subtree URI into a concrete document reference, issuing a narrower single-document URI permission grant along the way.
If you override this method you must call through to the superclass implementation.

Parameters
uri Uri: The Uri to canonicalize. This value cannot be null.

Returns
Uri Return the canonical representation of url, or null if canonicalization of that Uri is not supported.

copyDocument

Added in API level 24
public String copyDocument (String sourceDocumentId, 
                String targetParentDocumentId)

Copy the requested document or a document tree.

Copies a document including all child documents to another location within the same document provider. Upon completion returns the document id of the copied document at the target destination. null must never be returned.

Parameters
sourceDocumentId String: the document to copy.

targetParentDocumentId String: the target document to be copied into as a child.

Returns
String

Throws
AuthenticationRequiredException If authentication is required from the user (such as login credentials), but it is not guaranteed that the client will handle this properly.
FileNotFoundException

createDocument

Added in API level 19
public String createDocument (String parentDocumentId, 
                String mimeType, 
                String displayName)

Create a new document and return its newly generated Document#COLUMN_DOCUMENT_ID. You must allocate a new Document#COLUMN_DOCUMENT_ID to represent the document, which must not change once returned.

Parameters
parentDocumentId String: the parent directory to create the new document under.

mimeType String: the concrete MIME type associated with the new document. If the MIME type is not supported, the provider must throw.

displayName String: the display name of the new document. The provider may alter this name to meet any internal constraints, such as avoiding conflicting names.

Returns
String

Throws
AuthenticationRequiredException If authentication is required from the user (such as login credentials), but it is not guaranteed that the client will handle this properly.
FileNotFoundException

createWebLinkIntent

Added in API level 26
public IntentSender createWebLinkIntent (String documentId, 
                Bundle options)

Creates an intent sender for a web link, if the document is web linkable.

AuthenticationRequiredException can be thrown if user does not have sufficient permission for the linked document. Before any new permissions are granted for the linked document, a visible UI must be shown, so the user can explicitly confirm whether the permission grants are expected. The user must be able to cancel the operation.

Options passed as an argument may include a list of recipients, such as email addresses. The provider should reflect these options if possible, but it's acceptable to ignore them. In either case, confirmation UI must be shown before any new permission grants are granted.

It is all right to generate a web link without granting new permissions, if opening the link would result in a page for requesting permission access. If it's impossible then the operation must fail by throwing an exception.

Parameters
documentId String: the document to create a web link intent for.

options Bundle: additional information, such as list of recipients. Optional. This value may be null.

Returns
IntentSender

Throws
AuthenticationRequiredException If authentication is required from the user (such as login credentials), but it is not guaranteed that the client will handle this properly.
FileNotFoundException

delete

Added in API level 19
public final int delete (Uri uri, 
                String selection, 
                String[] selectionArgs)

Implementation is provided by the parent class. Throws by default, and cannot be overridden.

Parameters
uri Uri: The full URI to query, including a row ID (if a specific record is requested). This value cannot be null.

selection String: An optional restriction to apply to rows when deleting. This value may be null.

selectionArgs String: This value may be null.

Returns
int The number of rows affected.

deleteDocument

Added in API level 19
public void deleteDocument (String documentId)

Delete the requested document.

Upon returning, any URI permission grants for the given document will be revoked. If additional documents were deleted as a side effect of this call (such as documents inside a directory) the implementor is responsible for revoking those permissions using revokeDocumentPermission(java.lang.String).

Parameters
documentId String: the document to delete.

Throws
AuthenticationRequiredException If authentication is required from the user (such as login credentials), but it is not guaranteed that the client will handle this properly.
FileNotFoundException

ejectRoot

Added in API level 26
public void ejectRoot (String rootId)

Ejects the root. Throws IllegalStateException if ejection failed.

Parameters
rootId String: the root to be ejected.

findDocumentPath

Added in API level 26
public DocumentsContract.Path findDocumentPath (String parentDocumentId, 
                String childDocumentId)

Finds the canonical path for the requested document. The path must start from the parent document if parentDocumentId is not null or the root document if parentDocumentId is null. If there are more than one path to this document, return the most typical one. Include both the parent document or root document and the requested document in the returned path.

This API assumes that document ID has enough info to infer the root. Different roots should use different document ID to refer to the same document.

Parameters
parentDocumentId String: the document from which the path starts if not null, or null to indicate a path from the root is requested.

childDocumentId String: the document which path is requested.

Returns
DocumentsContract.Path the path of the requested document. If parentDocumentId is null returned root ID must not be null. If parentDocumentId is not null returned root ID must be null.

Throws
AuthenticationRequiredException If authentication is required from the user (such as login credentials), but it is not guaranteed that the client will handle this properly.
FileNotFoundException

getDocumentMetadata

Added in API level 29
public Bundle getDocumentMetadata (String documentId)

Returns metadata associated with the document. The type of metadata returned is specific to the document type. For example the data returned for an image file will likely consist primarily or solely of EXIF metadata.

The returned Bundle will contain zero or more entries depending on the type of data supported by the document provider.

  1. A DocumentsContract#METADATA_TYPES containing a String[] value. The string array identifies the type or types of metadata returned. Each value in the can be used to access a Bundle of data containing that type of data.
  2. An entry each for each type of returned metadata. Each set of metadata is itself represented as a bundle and accessible via a string key naming the type of data.

Parameters
documentId String: get the metadata of the document This value cannot be null.

Returns
Bundle a Bundle of Bundles. This value may be null.

Throws
FileNotFoundException

getDocumentStreamTypes

Added in API level 24
public String[] getDocumentStreamTypes (String documentId, 
                String mimeTypeFilter)

Return a list of streamable MIME types matching the filter, which can be passed to openTypedDocument(java.lang.String, java.lang.String, android.os.Bundle, android.os.CancellationSignal).

The default implementation returns a MIME type provided by queryDocument(java.lang.String, java.lang.String[]) as long as it matches the filter and the document does not have the Document#FLAG_VIRTUAL_DOCUMENT flag set.

Virtual documents must have at least one streamable format.

Parameters
documentId String

mimeTypeFilter String

Returns
String[]

getDocumentType

Added in API level 19
public String getDocumentType (String documentId)

Return concrete MIME type of the requested document. Must match the value of Document#COLUMN_MIME_TYPE for this document. The default implementation queries queryDocument(java.lang.String, java.lang.String[]), so providers may choose to override this as an optimization.

Parameters
documentId String

Returns
String

Throws
AuthenticationRequiredException If authentication is required from the user (such as login credentials), but it is not guaranteed that the client will handle this properly.
FileNotFoundException

getStreamTypes

Added in API level 19
public String[] getStreamTypes (Uri uri, 
                String mimeTypeFilter)

Called by a client to determine the types of data streams that this content provider support for the given URI.

Overriding this method is deprecated. Override openTypedDocument(String, String, Bundle, CancellationSignal) instead.

Parameters
uri Uri: The data in the content provider being queried. This value cannot be null.

mimeTypeFilter String: The type of data the client desires. May be a pattern, such as */* to retrieve all possible data types. This value cannot be null.

Returns
String[] Returns null if there are no possible data streams for the given mimeTypeFilter. Otherwise returns an array of all available concrete MIME types.

getType

Added in API level 19
public final String getType (Uri uri)

Implementation is provided by the parent class. Cannot be overridden.

Parameters
uri Uri: the URI to query. This value cannot be null.

Returns
String a MIME type string, or null if there is no type.

getTypeAnonymous

Added in API level 34
public final String getTypeAnonymous (Uri uri)

An unrestricted version of getType, which does not reveal sensitive information

Parameters
uri Uri: This value cannot be null.

Returns
String This value may be null.

insert

Added in API level 19
public final Uri insert (Uri uri, 
                ContentValues values)

Implementation is provided by the parent class. Throws by default, and cannot be overridden.

Parameters
uri Uri: The content:// URI of the insertion request. This value cannot be null.

values ContentValues: A set of column_name/value pairs to add to the database. This value may be null.

Returns
Uri The URI for the newly inserted item. This value may be null.

isChildDocument

Added in API level 21
public boolean isChildDocument (String parentDocumentId, 
                String documentId)

Test if a document is descendant (child, grandchild, etc) from the given parent. For example, providers must implement this to support Intent#ACTION_OPEN_DOCUMENT_TREE. You should avoid making network requests to keep this request fast.

Parameters
parentDocumentId String: parent to verify against.

documentId String: child to verify.

Returns
boolean if given document is a descendant of the given parent.

moveDocument

Added in API level 24
public String moveDocument (String sourceDocumentId, 
                String sourceParentDocumentId, 
                String targetParentDocumentId)

Move the requested document or a document tree.

Moves a document including all child documents to another location within the same document provider. Upon completion returns the document id of the copied document at the target destination. null must never be returned.

It's the responsibility of the provider to revoke grants if the document is no longer accessible using sourceDocumentId.

Parameters
sourceDocumentId String: the document to move.

sourceParentDocumentId String: the parent of the document to move.

targetParentDocumentId String: the target document to be a new parent of the source document.

Returns
String

Throws
AuthenticationRequiredException If authentication is required from the user (such as login credentials), but it is not guaranteed that the client will handle this properly.
FileNotFoundException

openAssetFile

Added in API level 19
public final AssetFileDescriptor openAssetFile (Uri uri, 
                String mode, 
                CancellationSignal signal)

Implementation is provided by the parent class. Cannot be overridden.

Parameters
uri Uri: The URI whose file is to be opened. This value cannot be null.

mode String: The string representation of the file mode. Can be "r", "w", "wt", "wa", "rw" or "rwt". Please note the exact implementation of these may differ for each Provider implementation - for example, "w" may or may not truncate. This value cannot be null.

signal CancellationSignal: A signal to cancel the operation in progress, or null if none. For example, if you are downloading a file from the network to service a "rw" mode request, you should periodically call CancellationSignal#throwIfCanceled() to check whether the client has canceled the request and abort the download.

Returns
AssetFileDescriptor Returns a new AssetFileDescriptor which you can use to access the file. This value may be null.

Throws
FileNotFoundException

openAssetFile

Added in API level 19
public final AssetFileDescriptor openAssetFile (Uri uri, 
                String mode)

Implementation is provided by the parent class. Cannot be overridden.

Parameters
uri Uri: The URI whose file is to be opened. This value cannot be null.

mode String: The string representation of the file mode. Can be "r", "w", "wt", "wa", "rw" or "rwt". Please note the exact implementation of these may differ for each Provider implementation - for example, "w" may or may not truncate. This value cannot be null.

Returns
AssetFileDescriptor Returns a new AssetFileDescriptor which you can use to access the file. This value may be null.

Throws
FileNotFoundException

openDocument

Added in API level 19
public abstract ParcelFileDescriptor openDocument (String documentId, 
                String mode, 
                CancellationSignal signal)

Open and return the requested document.

Your provider should return a reliable ParcelFileDescriptor to detect when the remote caller has finished reading or writing the document.

Mode "r" should always be supported. Provider should throw UnsupportedOperationException if the passing mode is not supported. You may return a pipe or socket pair if the mode is exclusively "r" or "w", but complex modes like "rw" imply a normal file on disk that supports seeking.

If you block while downloading content, you should periodically check CancellationSignal#isCanceled() to abort abandoned open requests.

Parameters
documentId String: the document to return.

mode String: the mode to open with, such as 'r', 'w', or 'rw'.

signal CancellationSignal: used by the caller to signal if the request should be cancelled. May be null.

Returns
ParcelFileDescriptor

Throws
AuthenticationRequiredException If authentication is required from the user (such as login credentials), but it is not guaranteed that the client will handle this properly.
FileNotFoundException

openDocumentThumbnail

Added in API level 19
public AssetFileDescriptor openDocumentThumbnail (String documentId, 
                Point sizeHint, 
                CancellationSignal signal)

Open and return a thumbnail of the requested document.

A provider should return a thumbnail closely matching the hinted size, attempting to serve from a local cache if possible. A provider should never return images more than double the hinted size.

If you perform expensive operations to download or generate a thumbnail, you should periodically check CancellationSignal#isCanceled() to abort abandoned thumbnail requests.

Parameters
documentId String: the document to return.

sizeHint Point: hint of the optimal thumbnail dimensions.

signal CancellationSignal: used by the caller to signal if the request should be cancelled. May be null.

Returns
AssetFileDescriptor

Throws
AuthenticationRequiredException If authentication is required from the user (such as login credentials), but it is not guaranteed that the client will handle this properly.
FileNotFoundException

openFile

Added in API level 19
public final ParcelFileDescriptor openFile (Uri uri, 
                String mode, 
                CancellationSignal signal)

Implementation is provided by the parent class. Cannot be overridden.

Parameters
uri Uri: The URI whose file is to be opened. This value cannot be null.

mode String: The string representation of the file mode. Can be "r", "w", "wt", "wa", "rw" or "rwt". Please note the exact implementation of these may differ for each Provider implementation - for example, "w" may or may not truncate. This value cannot be null.

signal CancellationSignal: A signal to cancel the operation in progress, or null if none. For example, if you are downloading a file from the network to service a "rw" mode request, you should periodically call CancellationSignal#throwIfCanceled() to check whether the client has canceled the request and abort the download.

Returns
ParcelFileDescriptor Returns a new ParcelFileDescriptor which you can use to access the file. This value may be null.

Throws
FileNotFoundException

openFile

Added in API level 19
public final ParcelFileDescriptor openFile (Uri uri, 
                String mode)

Implementation is provided by the parent class. Cannot be overridden.

Parameters
uri Uri: The URI whose file is to be opened. This value cannot be null.

mode String: The string representation of the file mode. Can be "r", "w", "wt", "wa", "rw" or "rwt". Please note the exact implementation of these may differ for each Provider implementation - for example, "w" may or may not truncate. This value cannot be null.

Returns
ParcelFileDescriptor Returns a new ParcelFileDescriptor which you can use to access the file. This value may be null.

Throws
FileNotFoundException

openTypedAssetFile

Added in API level 19
public final AssetFileDescriptor openTypedAssetFile (Uri uri, 
                String mimeTypeFilter, 
                Bundle opts)

Implementation is provided by the parent class. Cannot be overridden.

Parameters
uri Uri: The data in the content provider being queried. This value cannot be null.

mimeTypeFilter String: The type of data the client desires. May be a pattern, such as */*, if the caller does not have specific type requirements; in this case the content provider will pick its best type matching the pattern. This value cannot be null.

opts Bundle: Additional options from the client. The definitions of these are specific to the content provider being called. This value may be null.

Returns
AssetFileDescriptor Returns a new AssetFileDescriptor from which the client can read data of the desired type. This value may be null.

Throws
FileNotFoundException

openTypedAssetFile

Added in API level 19
public final AssetFileDescriptor openTypedAssetFile (Uri uri, 
                String mimeTypeFilter, 
                Bundle opts, 
                CancellationSignal signal)

Implementation is provided by the parent class. Cannot be overridden.

Parameters
uri Uri: The data in the content provider being queried. This value cannot be null.

mimeTypeFilter String: The type of data the client desires. May be a pattern, such as */*, if the caller does not have specific type requirements; in this case the content provider will pick its best type matching the pattern. This value cannot be null.

opts Bundle: Additional options from the client. The definitions of these are specific to the content provider being called. This value may be null.

signal CancellationSignal: A signal to cancel the operation in progress, or null if none. For example, if you are downloading a file from the network to service a "rw" mode request, you should periodically call CancellationSignal#throwIfCanceled() to check whether the client has canceled the request and abort the download.

Returns
AssetFileDescriptor Returns a new AssetFileDescriptor from which the client can read data of the desired type. This value may be null.

Throws
FileNotFoundException

openTypedDocument

Added in API level 24
public AssetFileDescriptor openTypedDocument (String documentId, 
                String mimeTypeFilter, 
                Bundle opts, 
                CancellationSignal signal)

Open and return the document in a format matching the specified MIME type filter.

A provider may perform a conversion if the documents's MIME type is not matching the specified MIME type filter.

Virtual documents must have at least one streamable format.

Parameters
documentId String: the document to return.

mimeTypeFilter String: the MIME type filter for the requested format. May be *\/*, which matches any MIME type.

opts Bundle: extra options from the client. Specific to the content provider.

signal CancellationSignal: used by the caller to signal if the request should be cancelled. May be null.

Returns
AssetFileDescriptor

Throws
AuthenticationRequiredException If authentication is required from the user (such as login credentials), but it is not guaranteed that the client will handle this properly.
FileNotFoundException

query

Added in API level 26
public final Cursor query (Uri uri, 
                String[] projection, 
                Bundle queryArgs, 
                CancellationSignal cancellationSignal)

Implementation is provided by the parent class. Cannot be overridden.

Parameters
uri Uri: The URI to query. This will be the full URI sent by the client. This value cannot be null.

projection String: The list of columns to put into the cursor. If null provide a default set of columns.

queryArgs Bundle: A Bundle containing additional information necessary for the operation. Arguments may include SQL style arguments, such as ContentResolver#QUERY_ARG_SQL_LIMIT, but note that the documentation for each individual provider will indicate which arguments they support. This value may be null.

cancellationSignal CancellationSignal: A signal to cancel the operation in progress, or null.

Returns
Cursor a Cursor or null.

query

Added in API level 19
public Cursor query (Uri uri, 
                String[] projection, 
                String selection, 
                String[] selectionArgs, 
                String sortOrder, 
                CancellationSignal cancellationSignal)

WARNING: Sub-classes should not override this method. This method is non-final solely for the purposes of backwards compatibility.

Parameters
uri Uri: The URI to query. This will be the full URI sent by the client; if the client is requesting a specific record, the URI will end in a record number that the implementation should parse and add to a WHERE or HAVING clause, specifying that _id value. This value cannot be null.

projection String: The list of columns to put into the cursor. If null all columns are included.

selection String: A selection criteria to apply when filtering rows. If null then all rows are included.

selectionArgs String: You may include ?s in selection, which will be replaced by the values from selectionArgs, in order that they appear in the selection. The values will be bound as Strings. This value may be null.

sortOrder String: How the rows in the cursor should be sorted. If null then the provider is free to define the sort order.

cancellationSignal CancellationSignal: A signal to cancel the operation in progress, or null if none. If the operation is canceled, then OperationCanceledException will be thrown when the query is executed.

Returns
Cursor a Cursor or null.

query

Added in API level 19
public final Cursor query (Uri uri, 
                String[] projection, 
                String selection, 
                String[] selectionArgs, 
                String sortOrder)

Implement this to handle query requests from clients.

Apps targeting Build.VERSION_CODES.O or higher should override query(android.net.Uri, java.lang.String[], android.os.Bundle, android.os.CancellationSignal) and provide a stub implementation of this method.

This method can be called from multiple threads, as described in Processes and Threads.

Example client call:

// Request a specific record.
 Cursor managedCursor = managedQuery(
         ContentUris.withAppendedId(Contacts.People.CONTENT_URI, 2),
         projection,    // Which columns to return.
         null,          // WHERE clause.
         null,          // WHERE clause value substitution
         People.NAME + " ASC");   // Sort order.
Example implementation:

// SQLiteQueryBuilder is a helper class that creates the
 // proper SQL syntax for us.
 SQLiteQueryBuilder qBuilder = new SQLiteQueryBuilder();

 // Guard against SQL injection attacks
 qBuilder.setStrict(true);
 qBuilder.setProjectionMap(MAP_OF_QUERYABLE_COLUMNS);
 qBuilder.setStrictColumns(true);
 qBuilder.setStrictGrammar(true);

 // Set the table we're querying.
 qBuilder.setTables(DATABASE_TABLE_NAME);

 // If the query ends in a specific record number, we're
 // being asked for a specific record, so set the
 // WHERE clause in our query.
 if((URI_MATCHER.match(uri)) == SPECIFIC_MESSAGE){
     qBuilder.appendWhere("_id=" + uri.getPathLeafId());
 }

 // Make the query.
 Cursor c = qBuilder.query(mDb,
         projection,
         selection,
         selectionArgs,
         groupBy,
         having,
         sortOrder);
 c.setNotificationUri(getContext().getContentResolver(), uri);
 return c;

Parameters
uri Uri: The URI to query. This will be the full URI sent by the client; if the client is requesting a specific record, the URI will end in a record number that the implementation should parse and add to a WHERE or HAVING clause, specifying that _id value. This value cannot be null.

projection String: The list of columns to put into the cursor. If null all columns are included.

selection String: A selection criteria to apply when filtering rows. If null then all rows are included.

selectionArgs String: You may include ?s in selection, which will be replaced by the values from selectionArgs, in order that they appear in the selection. The values will be bound as Strings. This value may be null.

sortOrder String: How the rows in the cursor should be sorted. If null then the provider is free to define the sort order.

Returns
Cursor a Cursor or null.

queryChildDocuments

Added in API level 26
public Cursor queryChildDocuments (String parentDocumentId, 
                String[] projection, 
                Bundle queryArgs)

Override this method to return the children documents contained in the requested directory. This must return immediate descendants only.

If your provider is cloud-based, and you have data cached locally, you may return the local data immediately, setting DocumentsContract#EXTRA_LOADING on Cursor extras to indicate that you are still fetching additional data. Then, when the network data is available, you can send a change notification to trigger a requery and return the complete contents. To return a Cursor with extras, you need to extend and override Cursor#getExtras().

To support change notifications, you must Cursor#setNotificationUri(ContentResolver, Uri) with a relevant Uri, such as DocumentsContract#buildChildDocumentsUri(String, String). Then you can call ContentResolver#notifyChange(Uri, android.database.ContentObserver, boolean) with that Uri to send change notifications.

Parameters
parentDocumentId String: the directory to return children for.

projection String: list of Document columns to put into the cursor. If null all supported columns should be included.

queryArgs Bundle: Bundle containing sorting information or other argument useful to the provider. If no sorting information is available, default sorting will be used, which may be unordered. See ContentResolver#QUERY_ARG_SORT_COLUMNS for details. This value may be null.

Returns
Cursor

Throws
AuthenticationRequiredException If authentication is required from the user (such as login credentials), but it is not guaranteed that the client will handle this properly.
FileNotFoundException

queryChildDocuments

Added in API level 19
public abstract Cursor queryChildDocuments (String parentDocumentId, 
                String[] projection, 
                String sortOrder)

Return the children documents contained in the requested directory. This must only return immediate descendants, as additional queries will be issued to recursively explore the tree.

Apps targeting Build.VERSION_CODES.O or higher should override queryChildDocuments(java.lang.String, java.lang.String[], android.os.Bundle).

If your provider is cloud-based, and you have some data cached or pinned locally, you may return the local data immediately, setting DocumentsContract#EXTRA_LOADING on the Cursor to indicate that you are still fetching additional data. Then, when the network data is available, you can send a change notification to trigger a requery and return the complete contents. To return a Cursor with extras, you need to extend and override Cursor#getExtras().

To support change notifications, you must Cursor#setNotificationUri(ContentResolver, Uri) with a relevant Uri, such as DocumentsContract#buildChildDocumentsUri(String, String). Then you can call ContentResolver#notifyChange(Uri, android.database.ContentObserver, boolean) with that Uri to send change notifications.

Parameters
parentDocumentId String: the directory to return children for.

projection String: list of Document columns to put into the cursor. If null all supported columns should be included.

sortOrder String: how to order the rows, formatted as an SQL ORDER BY clause (excluding the ORDER BY itself). Passing null will use the default sort order, which may be unordered. This ordering is a hint that can be used to prioritize how data is fetched from the network, but UI may always enforce a specific ordering.

Returns
Cursor

Throws
AuthenticationRequiredException If authentication is required from the user (such as login credentials), but it is not guaranteed that the client will handle this properly.
FileNotFoundException

queryDocument

Added in API level 19
public abstract Cursor queryDocument (String documentId, 
                String[] projection)

Return metadata for the single requested document. You should avoid making network requests to keep this request fast.

Parameters
documentId String: the document to return.

projection String: list of Document columns to put into the cursor. If null all supported columns should be included.

Returns
Cursor

Throws
AuthenticationRequiredException If authentication is required from the user (such as login credentials), but it is not guaranteed that the client will handle this properly.
FileNotFoundException

queryRecentDocuments

Added in API level 29
public Cursor queryRecentDocuments (String rootId, 
                String[] projection, 
                Bundle queryArgs, 
                CancellationSignal signal)

Return recently modified documents under the requested root. This will only be called for roots that advertise Root#FLAG_SUPPORTS_RECENTS. The returned documents should be sorted by Document#COLUMN_LAST_MODIFIED in descending order of the most recently modified documents.

If this method is overriden by the concrete DocumentsProvider and ContentResolver#QUERY_ARG_LIMIT is specified with a nonnegative int under queryArgs, the result will be limited by that number and ContentResolver#QUERY_ARG_LIMIT will be specified under ContentResolver#EXTRA_HONORED_ARGS. Otherwise, a default 64 limit will be used and no QUERY_ARG* will be specified under ContentResolver#EXTRA_HONORED_ARGS.

Recent documents do not support change notifications.

Parameters
rootId String: This value cannot be null.

projection String: list of Document columns to put into the cursor. If null all supported columns should be included.

queryArgs Bundle: the extra query arguments. This value may be null.

signal CancellationSignal: used by the caller to signal if the request should be cancelled. May be null.

Returns
Cursor This value may be null.

Throws
FileNotFoundException

queryRecentDocuments

Added in API level 19
public Cursor queryRecentDocuments (String rootId, 
                String[] projection)

Return recently modified documents under the requested root. This will only be called for roots that advertise Root#FLAG_SUPPORTS_RECENTS. The returned documents should be sorted by Document#COLUMN_LAST_MODIFIED in descending order, and limited to only return the 64 most recently modified documents.

Recent documents do not support change notifications.

Parameters
rootId String

projection String: list of Document columns to put into the cursor. If null all supported columns should be included.

Returns
Cursor

Throws
FileNotFoundException

queryRoots

Added in API level 19
public abstract Cursor queryRoots (String[] projection)

Return all roots currently provided. To display to users, you must define at least one root. You should avoid making network requests to keep this request fast.

Each root is defined by the metadata columns described in Root, including Root#COLUMN_DOCUMENT_ID which points to a directory representing a tree of documents to display under that root.

If this set of roots changes, you must call ContentResolver#notifyChange(Uri, android.database.ContentObserver, boolean) with DocumentsContract#buildRootsUri(String) to notify the system.

Parameters
projection String: list of Root columns to put into the cursor. If null all supported columns should be included.

Returns
Cursor

Throws
FileNotFoundException

querySearchDocuments

Added in API level 29
public Cursor querySearchDocuments (String rootId, 
                String[] projection, 
                Bundle queryArgs)

Return documents that match the given query under the requested root. The returned documents should be sorted by relevance in descending order. How documents are matched against the query string is an implementation detail left to each provider, but it's suggested that at least Document#COLUMN_DISPLAY_NAME be matched in a case-insensitive fashion.

If your provider is cloud-based, and you have some data cached or pinned locally, you may return the local data immediately, setting DocumentsContract#EXTRA_LOADING on the Cursor to indicate that you are still fetching additional data. Then, when the network data is available, you can send a change notification to trigger a requery and return the complete contents.

To support change notifications, you must Cursor#setNotificationUri(ContentResolver, Uri) with a relevant Uri, such as DocumentsContract#buildSearchDocumentsUri(String, String, String). Then you can call ContentResolver#notifyChange(Uri, android.database.ContentObserver, boolean) with that Uri to send change notifications.

Parameters
rootId String: the root to search under. This value cannot be null.

projection String: list of Document columns to put into the cursor. If null all supported columns should be included.

queryArgs Bundle: the query arguments. DocumentsContract#QUERY_ARG_EXCLUDE_MEDIA, DocumentsContract#QUERY_ARG_DISPLAY_NAME, DocumentsContract#QUERY_ARG_MIME_TYPES, DocumentsContract#QUERY_ARG_FILE_SIZE_OVER, DocumentsContract#QUERY_ARG_LAST_MODIFIED_AFTER. This value cannot be null.

Returns
Cursor cursor containing search result. Include ContentResolver#EXTRA_HONORED_ARGS in Cursor extras Bundle when any QUERY_ARG_* value was honored during the preparation of the results. This value may be null.

Throws
FileNotFoundException

querySearchDocuments

Added in API level 19
public Cursor querySearchDocuments (String rootId, 
                String query, 
                String[] projection)

Return documents that match the given query under the requested root. The returned documents should be sorted by relevance in descending order. How documents are matched against the query string is an implementation detail left to each provider, but it's suggested that at least Document#COLUMN_DISPLAY_NAME be matched in a case-insensitive fashion.

If your provider is cloud-based, and you have some data cached or pinned locally, you may return the local data immediately, setting DocumentsContract#EXTRA_LOADING on the Cursor to indicate that you are still fetching additional data. Then, when the network data is available, you can send a change notification to trigger a requery and return the complete contents.

To support change notifications, you must Cursor#setNotificationUri(ContentResolver, Uri) with a relevant Uri, such as DocumentsContract#buildSearchDocumentsUri(String, String, String). Then you can call ContentResolver#notifyChange(Uri, android.database.ContentObserver, boolean) with that Uri to send change notifications.

Parameters
rootId String: the root to search under.

query String: string to match documents against.

projection String: list of Document columns to put into the cursor. If null all supported columns should be included.

Returns
Cursor

Throws
AuthenticationRequiredException If authentication is required from the user (such as login credentials), but it is not guaranteed that the client will handle this properly.
FileNotFoundException

removeDocument

Added in API level 24
public void removeDocument (String documentId, 
                String parentDocumentId)

Removes the requested document or a document tree.

In contrast to deleteDocument(String) it requires specifying the parent. This method is especially useful if the document can be in multiple parents.

It's the responsibility of the provider to revoke grants if the document is removed from the last parent, and effectively the document is deleted.

Parameters
documentId String: the document to remove.

parentDocumentId String: the parent of the document to move.

Throws
AuthenticationRequiredException If authentication is required from the user (such as login credentials), but it is not guaranteed that the client will handle this properly.
FileNotFoundException

renameDocument

Added in API level 21
public String renameDocument (String documentId, 
                String displayName)

Rename an existing document.

If a different Document#COLUMN_DOCUMENT_ID must be used to represent the renamed document, generate and return it. Any outstanding URI permission grants will be updated to point at the new document. If the original Document#COLUMN_DOCUMENT_ID is still valid after the rename, return null.

Parameters
documentId String: the document to rename.

displayName String: the updated display name of the document. The provider may alter this name to meet any internal constraints, such as avoiding conflicting names.

Returns
String

Throws
AuthenticationRequiredException If authentication is required from the user (such as login credentials), but it is not guaranteed that the client will handle this properly.
FileNotFoundException

revokeDocumentPermission

Added in API level 21
public final void revokeDocumentPermission (String documentId)

Revoke any active permission grants for the given Document#COLUMN_DOCUMENT_ID, usually called when a document becomes invalid. Follows the same semantics as Context#revokeUriPermission(Uri, int).

Parameters
documentId String

update

Added in API level 19
public final int update (Uri uri, 
                ContentValues values, 
                String selection, 
                String[] selectionArgs)

Implementation is provided by the parent class. Throws by default, and cannot be overridden.

Parameters
uri Uri: The URI to query. This can potentially have a record ID if this is an update request for a specific record. This value cannot be null.

values ContentValues: A set of column_name/value pairs to update in the database. This value may be null.

selection String: An optional filter to match rows to update. This value may be null.

selectionArgs String: This value may be null.

Returns
int the number of rows affected.