added in version 24.1.0
belongs to Maven artifact com.android.support:support-compat:28.0.0-alpha1
belongs to Maven artifact com.android.support:support-compat:28.0.0-alpha1
ContentResolverCompat
public
final
class
ContentResolverCompat
extends Object
java.lang.Object | |
↳ | android.support.v4.content.ContentResolverCompat |
Helper for accessing features in ContentResolver
in a backwards
compatible fashion.
Summary
Public methods | |
---|---|
static
Cursor
|
query(ContentResolver resolver, Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder, CancellationSignal cancellationSignal)
Query the given URI, returning a |
Inherited methods | |
---|---|
From
class
java.lang.Object
|
Public methods
query
added in version 24.1.0
Cursor query (ContentResolver resolver, Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder, CancellationSignal cancellationSignal)
Query the given URI, returning a Cursor
over the result set
with optional support for cancellation.
For best performance, the caller should follow these guidelines:
- Provide an explicit projection, to prevent reading data from storage that aren't going to be used.
- Use question mark parameter markers such as 'phone=?' instead of
explicit values in the
selection
parameter, so that queries that differ only by those values will be recognized as the same for caching purposes.
Parameters | |
---|---|
resolver |
ContentResolver |
uri |
Uri : The URI, using the content:// scheme, for the content to
retrieve. |
projection |
String : A list of which columns to return. Passing null will
return all columns, which is inefficient. |
selection |
String : A filter declaring which rows to return, formatted as an
SQL WHERE clause (excluding the WHERE itself). Passing null will
return all rows for the given URI. |
selectionArgs |
String : You may include ?s in selection, which will be
replaced by the values from selectionArgs, in the order that they
appear in the selection. The values will be bound as Strings. |
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. |
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 object, which is positioned before the first entry, or null |
See also:
Interfaces
Classes