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added in version 24.1.0
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 Cursor over the result set with optional support for cancellation.

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: