ContentResolverCompat

public final class ContentResolverCompat


Helper for accessing features in ContentResolver in a backwards compatible fashion.

Summary

Public constructors

Public methods

static @Nullable Cursor
query(
    @NonNull ContentResolver resolver,
    @NonNull Uri uri,
    String[] projection,
    @Nullable String selection,
    String[] selectionArgs,
    @Nullable String sortOrder,
    @Nullable CancellationSignal cancellationSignal
)

Query the given URI, returning a Cursor over the result set with optional support for cancellation.

Public constructors

ContentResolverCompat

public final ContentResolverCompat()

Public methods

query

public static @Nullable Cursor query(
    @NonNull ContentResolver resolver,
    @NonNull Uri uri,
    String[] projection,
    @Nullable String selection,
    String[] selectionArgs,
    @Nullable String sortOrder,
    @Nullable 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
@NonNull Uri uri

The URI, using the content:// scheme, for the content to retrieve.

String[] projection

A list of which columns to return. Passing null will return all columns, which is inefficient.

@Nullable String selection

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.

String[] selectionArgs

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.

@Nullable String sortOrder

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.

@