SliceProvider


public abstract class SliceProvider
extends ContentProvider

java.lang.Object
   ↳ android.content.ContentProvider
     ↳ android.app.slice.SliceProvider


This class was deprecated in API level 35.
Slice framework has been deprecated, it will not receive any updates from ERROR(/android.os.Build.VANILLA_ICE_CREAM) and forward. If you are looking for a framework that sends displayable data from one app to another, consider using AppSearchManager.

A SliceProvider allows an app to provide content to be displayed in system spaces. This content is templated and can contain actions, and the behavior of how it is surfaced is specific to the system surface.

Slices are not currently live content. They are bound once and shown to the user. If the content changes due to a callback from user interaction, then ContentResolver.notifyChange(Uri, ContentObserver) should be used to notify the system.

The provider needs to be declared in the manifest to provide the authority for the app. The authority for most slices is expected to match the package of the application.

 <provider
     android:name="com.example.mypkg.MySliceProvider"
     android:authorities="com.example.mypkg" />
 

Slices can be identified by a Uri or by an Intent. To link an Intent with a slice, the provider must have an IntentFilter matching the slice intent. When a slice is being requested via an intent, onMapIntentToUri(android.content.Intent) can be called and is expected to return an appropriate Uri representing the slice.

 <provider
     android:name="com.example.mypkg.MySliceProvider"
     android:authorities="com.example.mypkg">
     <intent-filter>
         <action android:name="com.example.mypkg.intent.action.MY_SLICE_INTENT" />
         <category android:name="android.app.slice.category.SLICE" />
     </intent-filter>
 </provider>
 

See also:

Summary

Constants

String SLICE_TYPE

This is the Android platform's MIME type for a URI containing a slice implemented through SliceProvider.

Inherited constants

int TRIM_MEMORY_BACKGROUND

Level for onTrimMemory(int): the process has gone on to the LRU list.

int TRIM_MEMORY_COMPLETE

This constant was deprecated in API level 35. Apps are not notified of this level since API level 34

int TRIM_MEMORY_MODERATE

This constant was deprecated in API level 35. Apps are not notified of this level since API level 34

int TRIM_MEMORY_RUNNING_CRITICAL

This constant was deprecated in API level 35. Apps are not notified of this level since API level 34

int TRIM_MEMORY_RUNNING_LOW

This constant was deprecated in API level 35. Apps are not notified of this level since API level 34

int TRIM_MEMORY_RUNNING_MODERATE

This constant was deprecated in API level 35. Apps are not notified of this level since API level 34

int TRIM_MEMORY_UI_HIDDEN

Level for onTrimMemory(int): the process had been showing a user interface, and is no longer doing so.

Public constructors

SliceProvider()
SliceProvider(String... autoGrantPermissions)

A version of constructing a SliceProvider that allows autogranting slice permissions to apps that hold specific platform permissions.

Public methods

void attachInfo(Context context, ProviderInfo info)

After being instantiated, this is called to tell the content provider about itself.

Bundle call(String method, String arg, Bundle extras)
final int delete(Uri uri, String selection, String[] selectionArgs)

Implement this to handle requests to delete one or more rows.

final String getType(Uri uri)

Implement this to handle requests for the MIME type of the data at the given URI.

final Uri insert(Uri uri, ContentValues values)

Implement this to handle requests to insert a new row.

Slice onBindSlice(Uri sliceUri, Set<SliceSpec> supportedSpecs)

Implemented to create a slice.

PendingIntent onCreatePermissionRequest(Uri sliceUri)

Called when an app requests a slice it does not have write permission to the uri for.

Collection<Uri> onGetSliceDescendants(Uri uri)

Obtains a list of slices that are descendants of the specified Uri.

Uri onMapIntentToUri(Intent intent)

This method must be overridden if an IntentFilter is specified on the SliceProvider.

void onSlicePinned(Uri sliceUri)

Called to inform an app that a slice has been pinned.

void onSliceUnpinned(Uri sliceUri)

Called to inform an app that a slices is no longer pinned.

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

Implement this to handle query requests where the arguments are packed into a Bundle.

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

Implement this to handle query requests from clients.

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

Implement this to handle query requests from clients with support for cancellation.

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

Implement this to handle requests to update one or more rows.

Inherited methods

ContentProviderResult[] applyBatch(String authority, ArrayList<ContentProviderOperation> operations)

Override this to handle requests to perform a batch of operations, or the default implementation will iterate over the operations and call ContentProviderOperation.apply on each of them.

ContentProviderResult[] applyBatch(ArrayList<ContentProviderOperation> operations)
void attachInfo(Context context, ProviderInfo info)

After being instantiated, this is called to tell the content provider about itself.

int bulkInsert(Uri uri, ContentValues[] values)

Override this to handle requests to insert a set of new rows, or the default implementation will iterate over the values and call insert(Uri, ContentValues) on each of them.

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

Call a provider-defined method.

Bundle call(String method, String arg, Bundle extras)
Uri canonicalize(Uri url)

Implement this to support canonicalization of URIs that refer to your content provider.

final ContentProvider.CallingIdentity clearCallingIdentity()

Reset the identity of the incoming IPC on the current thread.

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

Implement this to handle requests to delete one or more rows.

int delete(Uri uri, Bundle extras)

Implement this to handle requests to delete one or more rows.

void dump(FileDescriptor fd, PrintWriter writer, String[] args)

Print the Provider's state into the given stream.

final AttributionSource getCallingAttributionSource()

Gets the attribution source of the calling app.

final String getCallingAttributionTag()

Return the attribution tag of the caller that initiated the request being processed on the current thread.

final String getCallingPackage()

Return the package name of the caller that initiated the request being processed on the current thread.

final String getCallingPackageUnchecked()

Return the package name of the caller that initiated the request being processed on the current thread.

final Context getContext()

Retrieves the Context this provider is running in.

final PathPermission[] getPathPermissions()

Return the path-based permissions required for read and/or write access to this content provider.

final String getReadPermission()

Return the name of the permission required for read-only access to this content provider.

String[] getStreamTypes(Uri uri, String mimeTypeFilter)

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

abstract String getType(Uri uri)

Implement this to handle requests for the MIME type of the data at the given URI.

String getTypeAnonymous(Uri uri)

Implement this to handle requests for MIME type of URIs, that does not need to reveal any internal information which should be protected by any permission.

final String getWritePermission()

Return the name of the permission required for read/write access to this content provider.

Uri insert(Uri uri, ContentValues values, Bundle extras)

Implement this to handle requests to insert a new row.

abstract Uri insert(Uri uri, ContentValues values)

Implement this to handle requests to insert a new row.

boolean isTemporary()

Returns true if this instance is a temporary content provider.

void onCallingPackageChanged()

Called whenever the value of getCallingPackage() changes, giving the provider an opportunity to invalidate any security related caching it may be performing.

void onConfigurationChanged(Configuration newConfig)

Called by the system when the device configuration changes while your component is running. This method is always called on the application main thread, and must not perform lengthy operations.

abstract boolean onCreate()

Implement this to initialize your content provider on startup.

void onLowMemory()

This is called when the overall system is running low on memory, and actively running processes should trim their memory usage. This method is always called on the application main thread, and must not perform lengthy operations.

void onTrimMemory(int level)

Called when the operating system has determined that it is a good time for a process to trim unneeded memory from its process.

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

This is like openFile(Uri, String), but can be implemented by providers that need to be able to return sub-sections of files, often assets inside of their .apk.

AssetFileDescriptor openAssetFile(Uri uri, String mode)

This is like openFile(Uri, String), but can be implemented by providers that need to be able to return sub-sections of files, often assets inside of their .apk.

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

Override this to handle requests to open a file blob.

ParcelFileDescriptor openFile(Uri uri, String mode)

Override this to handle requests to open a file blob.

final ParcelFileDescriptor openFileHelper(Uri uri, String mode)

Convenience for subclasses that wish to implement openFile(Uri, String) by looking up a column named "_data" at the given URI.

<T> ParcelFileDescriptor openPipeHelper(Uri uri, String mimeType, Bundle opts, T args, PipeDataWriter<T> func)

A helper function for implementing openTypedAssetFile(Uri, String, Bundle), for creating a data pipe and background thread allowing you to stream generated data back to the client.

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

Called by a client to open a read-only stream containing data of a particular MIME type.

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

Called by a client to open a read-only stream containing data of a particular MIME type.

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

Implement this to handle query requests where the arguments are packed into a Bundle.

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

Implement this to handle query requests from clients with support for cancellation.

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

Implement this to handle query requests from clients.

boolean refresh(Uri uri, Bundle extras, CancellationSignal cancellationSignal)

Implement this to support refresh of content identified by uri.

final Context requireContext()

Retrieves a Non-Nullable Context this provider is running in, this is intended to be called after onCreate().

final void restoreCallingIdentity(ContentProvider.CallingIdentity identity)

Restore the identity of the incoming IPC on the current thread back to a previously identity that was returned by clearCallingIdentity().

final void setPathPermissions(PathPermission[] permissions)

Change the path-based permission required to read and/or write data in the content provider.

final void setReadPermission(String permission)

Change the permission required to read data from the content provider.

final void setWritePermission(String permission)

Change the permission required to read and write data in the content provider.

void shutdown()

Implement this to shut down the ContentProvider instance.

Uri uncanonicalize(Uri url)

Remove canonicalization from canonical URIs previously returned by canonicalize(Uri).

int update(Uri uri, ContentValues values, Bundle extras)

Implement this to handle requests to update one or more rows.

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

Implement this to handle requests to update one or more rows.

Object clone()

Creates and returns a copy of this object.

boolean equals(Object obj)

Indicates whether some other object is "equal to" this one.

void finalize()

Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.

final Class<?> getClass()

Returns the runtime class of this Object.

int hashCode()

Returns a hash code value for the object.

final void notify()

Wakes up a single thread that is waiting on this object's monitor.

final void notifyAll()

Wakes up all threads that are waiting on this object's monitor.

String toString()

Returns a string representation of the object.

final void wait(long timeoutMillis, int nanos)

Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

final void wait(long timeoutMillis)

Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

final void wait()

Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

abstract void onTrimMemory(int level)

Called when the operating system has determined that it is a good time for a process to trim unneeded memory from its process.

abstract void onConfigurationChanged(Configuration newConfig)

Called by the system when the device configuration changes while your component is running.

abstract void onLowMemory()

This method was deprecated in API level 35. Since API level 14 this is superseded by ComponentCallbacks2.onTrimMemory. Since API level 34 this is never called. If you're overriding ComponentCallbacks2#onTrimMemory and your minSdkVersion is greater than API 14, you can provide an empty implementation for this method.

Constants

SLICE_TYPE

Added in API level 28
public static final String SLICE_TYPE

This is the Android platform's MIME type for a URI containing a slice implemented through SliceProvider.

Constant Value: "vnd.android.slice"

Public constructors

SliceProvider

Added in API level 28
public SliceProvider ()

SliceProvider

Added in API level 28
public SliceProvider (String... autoGrantPermissions)

A version of constructing a SliceProvider that allows autogranting slice permissions to apps that hold specific platform permissions.

When an app tries to bind a slice from this provider that it does not have access to, This provider will check if the caller holds permissions to any of the autoGrantPermissions specified, if they do they will be granted persisted uri access to all slices of this provider.

Parameters
autoGrantPermissions String: List of permissions that holders are auto-granted access to slices. This value cannot be null.

Public methods

attachInfo

Added in API level 28
public void attachInfo (Context context, 
                ProviderInfo info)

After being instantiated, this is called to tell the content provider about itself.

Parameters
context Context: The context this provider is running in

info ProviderInfo: Registered information about this content provider

call

Added in API level 28
public Bundle call (String method, 
                String arg, 
                Bundle extras)

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.

delete

Added in API level 28
public final int delete (Uri uri, 
                String selection, 
                String[] selectionArgs)

Implement this to handle requests to delete one or more rows. The implementation should apply the selection clause when performing deletion, allowing the operation to affect multiple rows in a directory. As a courtesy, call notifyChange() after deleting. This method can be called from multiple threads, as described in Processes and Threads.

The implementation is responsible for parsing out a row ID at the end of the URI, if a specific row is being deleted. That is, the client would pass in content://contacts/people/22 and the implementation is responsible for parsing the record number (22) when creating a SQL statement.

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.

getType

Added in API level 28
public final String getType (Uri uri)

Implement this to handle requests for the MIME type of the data at the given URI. The returned MIME type should start with vnd.android.cursor.item for a single record, or vnd.android.cursor.dir/ for multiple items. This method can be called from multiple threads, as described in Processes and Threads.

Note that by default there are no permissions needed for an application to access this information; if your content provider requires read and/or write permissions, or is not exported, all applications can still call this method regardless of their access permissions.

If your mime type reveals details that should be protected, then you should protect this method by implementing getTypeAnonymous(Uri). Implementing getTypeAnonymous(Uri) ensures your getType(Uri) can be only accessed by caller's having associated readPermission for the URI.

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.

insert

Added in API level 28
public final Uri insert (Uri uri, 
                ContentValues values)

Implement this to handle requests to insert a new row. As a courtesy, call notifyChange() after inserting. This method can be called from multiple threads, as described in Processes and Threads.

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.

onBindSlice

Added in API level 28
public Slice onBindSlice (Uri sliceUri, 
                Set<SliceSpec> supportedSpecs)

Implemented to create a slice.

onBindSlice should return as quickly as possible so that the UI tied to this slice can be responsive. No network or other IO will be allowed during onBindSlice. Any loading that needs to be done should happen in the background with a call to ContentResolver.notifyChange(Uri, ContentObserver) when the app is ready to provide the complete data in onBindSlice.

The slice returned should have a spec that is compatible with one of the supported specs.

Parameters
sliceUri Uri: Uri to bind.

supportedSpecs Set: List of supported specs.

Returns
Slice

onCreatePermissionRequest

Added in API level 28
public PendingIntent onCreatePermissionRequest (Uri sliceUri)

Called when an app requests a slice it does not have write permission to the uri for.

The return value will be the action on a slice that prompts the user that the calling app wants to show slices from this app. The default implementation launches a dialog that allows the user to grant access to this slice. Apps that do not want to allow this user grant, can override this and instead launch their own dialog with different behavior.

Parameters
sliceUri Uri: the Uri of the slice attempting to be bound.

Returns
PendingIntent This value cannot be null.

onGetSliceDescendants

Added in API level 28
public Collection<Uri> onGetSliceDescendants (Uri uri)

Obtains a list of slices that are descendants of the specified Uri.

Implementing this is optional for a SliceProvider, but does provide a good discovery mechanism for finding slice Uris.

Parameters
uri Uri: The uri to look for descendants under. This value cannot be null.

Returns
Collection<Uri> All slices within the space. This value cannot be null.

onMapIntentToUri

Added in API level 28
public Uri onMapIntentToUri (Intent intent)

This method must be overridden if an IntentFilter is specified on the SliceProvider. In that case, this method can be called and is expected to return a non-null Uri representing a slice. Otherwise this will throw UnsupportedOperationException. Any intent filter added to a slice provider should also contain SliceManager.CATEGORY_SLICE, because otherwise it will not be detected by SliceManager.mapIntentToUri(Intent).

Parameters
intent Intent

Returns
Uri Uri representing the slice associated with the provided intent.

onSlicePinned

Added in API level 28
public void onSlicePinned (Uri sliceUri)

Called to inform an app that a slice has been pinned.

Pinning is a way that slice hosts use to notify apps of which slices they care about updates for. When a slice is pinned the content is expected to be relatively fresh and kept up to date.

Being pinned does not provide any escalated privileges for the slice provider. So apps should do things such as turn on syncing or schedule a job in response to a onSlicePinned.

Pinned state is not persisted through a reboot, and apps can expect a new call to onSlicePinned for any slices that should remain pinned after a reboot occurs.

Parameters
sliceUri Uri: The uri of the slice being unpinned.

onSliceUnpinned

Added in API level 28
public void onSliceUnpinned (Uri sliceUri)

Called to inform an app that a slices is no longer pinned.

This means that no other apps on the device care about updates to this slice anymore and therefore it is not important to be updated. Any syncs or jobs related to this slice should be cancelled.

Parameters
sliceUri Uri

See also:

query

Added in API level 28
public final Cursor query (Uri uri, 
                String[] projection, 
                Bundle queryArgs, 
                CancellationSignal cancellationSignal)

Implement this to handle query requests where the arguments are packed into a Bundle. Arguments may include traditional SQL style query arguments. When present these should be handled according to the contract established in query(android.net.Uri, java.lang.String[], java.lang.String, java.lang.String[], java.lang.String, android.os.CancellationSignal).

Traditional SQL arguments can be found in the bundle using the following keys:

  • ContentResolver.QUERY_ARG_SQL_SELECTION
  • ContentResolver.QUERY_ARG_SQL_SELECTION_ARGS
  • ContentResolver.QUERY_ARG_SQL_SORT_ORDER

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

    Example client call:

    // Request 20 records starting at row index 30.
     Bundle queryArgs = new Bundle();
     queryArgs.putInt(ContentResolver.QUERY_ARG_OFFSET, 30);
     queryArgs.putInt(ContentResolver.QUERY_ARG_LIMIT, 20);
    
     Cursor cursor = getContentResolver().query(
             contentUri,    // Content Uri is specific to individual content providers.
             projection,    // String[] describing which columns to return.
             queryArgs,     // Query arguments.
             null);         // Cancellation signal.
    Example implementation:

     int recordsetSize = 0x1000;  // Actual value is implementation specific.
     queryArgs = queryArgs != null ? queryArgs : Bundle.EMPTY;  // ensure queryArgs is non-null
    
     int offset = queryArgs.getInt(ContentResolver.QUERY_ARG_OFFSET, 0);
     int limit = queryArgs.getInt(ContentResolver.QUERY_ARG_LIMIT, Integer.MIN_VALUE);
    
     MatrixCursor c = new MatrixCursor(PROJECTION, limit);
    
     // Calculate the number of items to include in the cursor.
     int numItems = MathUtils.constrain(recordsetSize - offset, 0, limit);
    
     // Build the paged result set....
     for (int i = offset; i < offset + numItems; i++) {
         // populate row from your data.
     }
    
     Bundle extras = new Bundle();
     c.setExtras(extras);
    
     // Any QUERY_ARG_* key may be included if honored.
     // In an actual implementation, include only keys that are both present in queryArgs
     // and reflected in the Cursor output. For example, if QUERY_ARG_OFFSET were included
     // in queryArgs, but was ignored because it contained an invalid value (like \u2013273),
     // then QUERY_ARG_OFFSET should be omitted.
     extras.putStringArray(ContentResolver.EXTRA_HONORED_ARGS, new String[] {
         ContentResolver.QUERY_ARG_OFFSET,
         ContentResolver.QUERY_ARG_LIMIT
     });
    
     extras.putInt(ContentResolver.EXTRA_TOTAL_COUNT, recordsetSize);
    
     cursor.setNotificationUri(getContext().getContentResolver(), uri);
    
     return cursor;

    See query(android.net.Uri, java.lang.String[], java.lang.String, java.lang.String[], java.lang.String, android.os.CancellationSignal) for implementation details.

    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 28
    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.

    query

    Added in API level 28
    public final Cursor query (Uri uri, 
                    String[] projection, 
                    String selection, 
                    String[] selectionArgs, 
                    String sortOrder, 
                    CancellationSignal cancellationSignal)

    Implement this to handle query requests from clients with support for cancellation.

    Apps targeting Build.VERSION_CODES.O or higher should override query(android.net.Uri, java.lang.String[], android.os.Bundle, android.os.CancellationSignal) instead 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;

    If you implement this method then you must also implement the version of query(android.net.Uri, java.lang.String[], java.lang.String, java.lang.String[], java.lang.String) that does not take a cancellation signal to ensure correct operation on older versions of the Android Framework in which the cancellation signal overload was not available.

    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.

    update

    Added in API level 28
    public final int update (Uri uri, 
                    ContentValues values, 
                    String selection, 
                    String[] selectionArgs)

    Implement this to handle requests to update one or more rows. The implementation should update all rows matching the selection to set the columns according to the provided values map. As a courtesy, call notifyChange() after updating. This method can be called from multiple threads, as described in Processes and Threads.

    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.