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Summary: Constants | Methods | Inherited Methods

# Cursor

`public interface Cursor`
`implements Closeable`

android.database.Cursor

Known indirect subclasses AbstractCursor, AbstractWindowedCursor, CrossProcessCursor, CrossProcessCursorWrapper, CursorWrapper, MatrixCursor, MergeCursor, MockCursor, SQLiteCursor
AbstractCursor | This is an abstract cursor class that handles a lot of the common code that all cursors need to deal with and is provided for convenience reasons.
AbstractWindowedCursor | A base class for Cursors that store their data in `CursorWindow`s.
CrossProcessCursor | A cross process cursor is an extension of a `Cursor` that also supports usage from remote processes.
CrossProcessCursorWrapper | Cursor wrapper that implements `CrossProcessCursor`.
CursorWrapper | Wrapper class for Cursor that delegates all calls to the actual cursor object.
MatrixCursor | A mutable cursor implementation backed by an array of `Object`s.
MergeCursor | A convenience class that lets you present an array of Cursors as a single linear Cursor.
MockCursor | This class is deprecated. Use a mocking framework like Mockito. New tests should be written using the Android Testing Support Library.
SQLiteCursor | A Cursor implementation that exposes results from a query on a `SQLiteDatabase`.

This interface provides random read-write access to the result set returned by a database query.

Cursor implementations are not required to be synchronized so code using a Cursor from multiple threads should perform its own synchronization when using the Cursor.

Implementations should subclass `AbstractCursor`.

## Summary

### Constants
`int` | `FIELD_TYPE_BLOB` Value returned by `getType(int)` if the specified column type is blob
`int` | `FIELD_TYPE_FLOAT` Value returned by `getType(int)` if the specified column type is float
`int` | `FIELD_TYPE_INTEGER` Value returned by `getType(int)` if the specified column type is integer
`int` | `FIELD_TYPE_NULL` Value returned by `getType(int)` if the specified column is null
`int` | `FIELD_TYPE_STRING` Value returned by `getType(int)` if the specified column type is string

### Public methods
`abstract void` | `close()` Closes the Cursor, releasing all of its resources and making it completely invalid.
`abstract void` | `copyStringToBuffer(int columnIndex, CharArrayBuffer buffer)` Retrieves the requested column text and stores it in the buffer provided.
`abstract void` | `deactivate()` This method is deprecated. Since `requery()` is deprecated, so too is this.
`abstract byte[]` | `getBlob(int columnIndex)` Returns the value of the requested column as a byte array.
`abstract int` | `getColumnCount()` Return total number of columns
`abstract int` | `getColumnIndex(String columnName)` Returns the zero-based index for the given column name, or -1 if the column doesn't exist.
`abstract int` | `getColumnIndexOrThrow(String columnName)` Returns the zero-based index for the given column name, or throws `IllegalArgumentException` if the column doesn't exist.
`abstract String` | `getColumnName(int columnIndex)` Returns the column name at the given zero-based column index.
`abstract String[]` | `getColumnNames()` Returns a string array holding the names of all of the columns in the result set in the order in which they were listed in the result.
`abstract int` | `getCount()` Returns the numbers of rows in the cursor.
`abstract double` | `getDouble(int columnIndex)` Returns the value of the requested column as a double.
`abstract Bundle` | `getExtras()` Returns a bundle of extra values.
`abstract float` | `getFloat(int columnIndex)` Returns the value of the requested column as a float.
`abstract int` | `getInt(int columnIndex)` Returns the value of the requested column as an int.
`abstract long` | `getLong(int columnIndex)` Returns the value of the requested column as a long.
`abstract Uri` | `getNotificationUri()` Return the URI at which notifications of changes in this Cursor's data will be delivered, as previously set by `setNotificationUri(ContentResolver, Uri)`.
`default List<Uri>` | `getNotificationUris()` Return the URIs at which notifications of changes in this Cursor's data will be delivered, as previously set by `setNotificationUris(ContentResolver, List)`.
`abstract int` | `getPosition()` Returns the current position of the cursor in the row set.
`abstract short` | `getShort(int columnIndex)` Returns the value of the requested column as a short.
`abstract String` | `getString(int columnIndex)` Returns the value of the requested column as a String.
`abstract int` | `getType(int columnIndex)` Returns data type of the given column's value.
`abstract boolean` | `getWantsAllOnMoveCalls()` onMove() will only be called across processes if this method returns true.
`abstract boolean` | `isAfterLast()` Returns whether the cursor is pointing to the position after the last row.
`abstract boolean` | `isBeforeFirst()` Returns whether the cursor is pointing to the position before the first row.
`abstract boolean` | `isClosed()` return true if the cursor is closed
`abstract boolean` | `isFirst()` Returns whether the cursor is pointing to the first row.
`abstract boolean` | `isLast()` Returns whether the cursor is pointing to the last row.
`abstract boolean` | `isNull(int columnIndex)` Returns `true` if the value in the indicated column is null.
`abstract boolean` | `move(int offset)` Move the cursor by a relative amount, forward or backward, from the current position.
`abstract boolean` | `moveToFirst()` Move the cursor to the first row.
`abstract boolean` | `moveToLast()` Move the cursor to the last row.
`abstract boolean` | `moveToNext()` Move the cursor to the next row.
`abstract boolean` | `moveToPosition(int position)` Move the cursor to an absolute position.
`abstract boolean` | `moveToPrevious()` Move the cursor to the previous row.
`abstract void` | `registerContentObserver(ContentObserver observer)` Register an observer that is called when changes happen to the content backing this cursor.
`abstract void` | `registerDataSetObserver(DataSetObserver observer)` Register an observer that is called when changes happen to the contents of the this cursors data set, for example, when the data set is changed via `requery()`, `deactivate()`, or `close()`.
`abstract boolean` | `requery()` This method is deprecated. Don't use this. Just request a new cursor, so you can do this asynchronously and update your list view once the new cursor comes back.
`abstract Bundle` | `respond(Bundle extras)` This is an out-of-band way for the the user of a cursor to communicate with the cursor.
`abstract void` | `setExtras(Bundle extras)` Sets a `Bundle` that will be returned by `getExtras()`.
`abstract void` | `setNotificationUri(ContentResolver cr, Uri uri)` Register to watch a content URI for changes.
`default void` | `setNotificationUris(ContentResolver cr, List<Uri> uris)` Similar to `setNotificationUri(android.content.ContentResolver, android.net.Uri)`, except this version allows to watch multiple content URIs for changes.
`abstract void` | `unregisterContentObserver(ContentObserver observer)` Unregister an observer that has previously been registered with this cursor via `registerContentObserver(ContentObserver)`.
`abstract void` | `unregisterDataSetObserver(DataSetObserver observer)` Unregister an observer that has previously been registered with this cursor via `registerContentObserver(ContentObserver)`.

### Inherited methods
From interface `java.io.Closeable`
`abstract void` | `close()` Closes this stream and releases any system resources associated with it.
From interface `java.lang.AutoCloseable`
`abstract void` | `close()` Closes this resource, relinquishing any underlying resources.

## Constants

### FIELD_TYPE_BLOB

    public static final int FIELD_TYPE_BLOB

Value returned by `getType(int)` if the specified column type is blob

Constant Value: 4 (0x00000004)

### FIELD_TYPE_FLOAT

    public static final int FIELD_TYPE_FLOAT

Value returned by `getType(int)` if the specified column type is float

Constant Value: 2 (0x00000002)

### FIELD_TYPE_INTEGER

    public static final int FIELD_TYPE_INTEGER

Value returned by `getType(int)` if the specified column type is integer

Constant Value: 1 (0x00000001)

### FIELD_TYPE_NULL

    public static final int FIELD_TYPE_NULL

Value returned by `getType(int)` if the specified column is null

Constant Value: 0 (0x00000000)

### FIELD_TYPE_STRING

    public static final int FIELD_TYPE_STRING

Value returned by `getType(int)` if the specified column type is string

Constant Value: 3 (0x00000003)

## Public methods

### close

    public abstract void close ()

Closes the Cursor, releasing all of its resources and making it completely invalid. Unlike `deactivate()` a call to `requery()` will not make the Cursor valid again.

### copyStringToBuffer

    public abstract void copyStringToBuffer (int columnIndex,
                    CharArrayBuffer buffer)

Retrieves the requested column text and stores it in the buffer provided. If the buffer size is not sufficient, a new char buffer will be allocated and assigned to CharArrayBuffer.data

Parameters
`columnIndex` | `int`: the zero-based index of the target column. if the target column is null, return buffer
`buffer` | `CharArrayBuffer`: the buffer to copy the text into.

### deactivate

    public abstract void deactivate ()

This method is deprecated.
Since `requery()` is deprecated, so too is this.

Deactivates the Cursor, making all calls on it fail until `requery()` is called. Inactive Cursors use fewer resources than active Cursors. Calling `requery()` will make the cursor active again.

### getBlob

    public abstract byte[] getBlob (int columnIndex)

Returns the value of the requested column as a byte array.

The result and whether this method throws an exception when the column value is null or the column type is not a blob type is implementation-defined.

Parameters
`columnIndex` | `int`: the zero-based index of the target column.

Returns
`byte[]` | the value of that column as a byte array.

### getColumnCount

    public abstract int getColumnCount ()

Return total number of columns

Returns
`int` | number of columns

### getColumnIndex

    public abstract int getColumnIndex (String columnName)

Returns the zero-based index for the given column name, or -1 if the column doesn't exist. If you expect the column to exist use `getColumnIndexOrThrow(java.lang.String)` instead, which will make the error more clear.

Parameters
`columnName` | `String`: the name of the target column.

Returns
`int` | the zero-based column index for the given column name, or -1 if the column name does not exist.

See also:

- `getColumnIndexOrThrow(String)`

### getColumnIndexOrThrow

    public abstract int getColumnIndexOrThrow (String columnName)

Returns the zero-based index for the given column name, or throws `IllegalArgumentException` if the column doesn't exist. If you're not sure if a column will exist or not use `getColumnIndex(java.lang.String)` and check for -1, which is more efficient than catching the exceptions.

Parameters
`columnName` | `String`: the name of the target column.

Returns
`int` | the zero-based column index for the given column name

Throws
`IllegalArgumentException` | if the column does not exist

See also:

- `getColumnIndex(String)`

### getColumnName

    public abstract String getColumnName (int columnIndex)

Returns the column name at the given zero-based column index.

Parameters
`columnIndex` | `int`: the zero-based index of the target column.

Returns
`String` | the column name for the given column index.

### getColumnNames

    public abstract String[] getColumnNames ()

Returns a string array holding the names of all of the columns in the result set in the order in which they were listed in the result.

Returns
`String[]` | the names of the columns returned in this query.

### getCount

    public abstract int getCount ()

Returns the numbers of rows in the cursor.

Returns
`int` | the number of rows in the cursor.

### getDouble

    public abstract double getDouble (int columnIndex)

Returns the value of the requested column as a double.

The result and whether this method throws an exception when the column value is null, the column type is not a floating-point type, or the floating-point value is not representable as a `double` value is implementation-defined.

Parameters
`columnIndex` | `int`: the zero-based index of the target column.

Returns
`double` | the value of that column as a double.

### getExtras

    public abstract Bundle getExtras ()

Returns a bundle of extra values. This is an optional way for cursors to provide out-of-band metadata to their users. One use of this is for reporting on the progress of network requests that are required to fetch data for the cursor.

These values may only change when requery is called.

Returns
`Bundle` | cursor-defined values, or `Bundle.EMPTY` if there are no values. Never `null`.

### getFloat

    public abstract float getFloat (int columnIndex)

Returns the value of the requested column as a float.

The result and whether this method throws an exception when the column value is null, the column type is not a floating-point type, or the floating-point value is not representable as a `float` value is implementation-defined.

Parameters
`columnIndex` | `int`: the zero-based index of the target column.

Returns
`float` | the value of that column as a float.

### getInt

    public abstract int getInt (int columnIndex)

Returns the value of the requested column as an int.

The result and whether this method throws an exception when the column value is null, the column type is not an integral type, or the integer value is outside the range [`Integer.MIN_VALUE`, `Integer.MAX_VALUE`] is implementation-defined.

Parameters
`columnIndex` | `int`: the zero-based index of the target column.

Returns
`int` | the value of that column as an int.

### getLong

    public abstract long getLong (int columnIndex)

Returns the value of the requested column as a long.

The result and whether this method throws an exception when the column value is null, the column type is not an integral type, or the integer value is outside the range [`Long.MIN_VALUE`, `Long.MAX_VALUE`] is implementation-defined.

Parameters
`columnIndex` | `int`: the zero-based index of the target column.

Returns
`long` | the value of that column as a long.

### getNotificationUri

    public abstract Uri getNotificationUri ()

Return the URI at which notifications of changes in this Cursor's data will be delivered, as previously set by `setNotificationUri(ContentResolver, Uri)`.

Returns
`Uri` | Returns a URI that can be used with `ContentResolver#registerContentObserver(android.net.Uri, boolean, ContentObserver)` to find out about changes to this Cursor's data. May be null if no notification URI has been set.

### getNotificationUris

    public List<Uri> getNotificationUris ()

Return the URIs at which notifications of changes in this Cursor's data will be delivered, as previously set by `setNotificationUris(ContentResolver, List)`.

If this is not implemented, this is equivalent to calling `getNotificationUri()`.

Returns
`List<Uri>` | Returns URIs that can be used with `ContentResolver#registerContentObserver(android.net.Uri, boolean, ContentObserver)` to find out about changes to this Cursor's data. May be null if no notification URI has been set.

### getPosition

    public abstract int getPosition ()

Returns the current position of the cursor in the row set. The value is zero-based. When the row set is first returned the cursor will be at positon -1, which is before the first row. After the last row is returned another call to next() will leave the cursor past the last entry, at a position of count().

Returns
`int` | the current cursor position.

### getShort

    public abstract short getShort (int columnIndex)

Returns the value of the requested column as a short.

The result and whether this method throws an exception when the column value is null, the column type is not an integral type, or the integer value is outside the range [`Short.MIN_VALUE`, `Short.MAX_VALUE`] is implementation-defined.

Parameters
`columnIndex` | `int`: the zero-based index of the target column.

Returns
`short` | the value of that column as a short.

### getString

    public abstract String getString (int columnIndex)

Returns the value of the requested column as a String.

The result and whether this method throws an exception when the column value is null or the column type is not a string type is implementation-defined.

Parameters
`columnIndex` | `int`: the zero-based index of the target column.

Returns
`String` | the value of that column as a String.

### getType

    public abstract int getType (int columnIndex)

Returns data type of the given column's value. The preferred type of the column is returned but the data may be converted to other types as documented in the get-type methods such as `getInt(int)`, `getFloat(int)` etc.

Returned column types are

- `FIELD_TYPE_NULL`
- `FIELD_TYPE_INTEGER`
- `FIELD_TYPE_FLOAT`
- `FIELD_TYPE_STRING`
- `FIELD_TYPE_BLOB`

Parameters
`columnIndex` | `int`: the zero-based index of the target column.

Returns
`int` | column value type

### getWantsAllOnMoveCalls

    public abstract boolean getWantsAllOnMoveCalls ()

onMove() will only be called across processes if this method returns true.

Returns
`boolean` | whether all cursor movement should result in a call to onMove().

### isAfterLast

    public abstract boolean isAfterLast ()

Returns whether the cursor is pointing to the position after the last row.

Returns
`boolean` | whether the cursor is after the last result.

### isBeforeFirst

    public abstract boolean isBeforeFirst ()

Returns whether the cursor is pointing to the position before the first row.

Returns
`boolean` | whether the cursor is before the first result.

### isClosed

    public abstract boolean isClosed ()

return true if the cursor is closed

Returns
`boolean` | true if the cursor is closed.

### isFirst

    public abstract boolean isFirst ()

Returns whether the cursor is pointing to the first row.

Returns
`boolean` | whether the cursor is pointing at the first entry.

### isLast

    public abstract boolean isLast ()

Returns whether the cursor is pointing to the last row.

Returns
`boolean` | whether the cursor is pointing at the last entry.

### isNull

    public abstract boolean isNull (int columnIndex)

Returns `true` if the value in the indicated column is null.

Parameters
`columnIndex` | `int`: the zero-based index of the target column.

Returns
`boolean` | whether the column value is null.

### move

    public abstract boolean move (int offset)

Move the cursor by a relative amount, forward or backward, from the current position. Positive offsets move forwards, negative offsets move backwards. If the final position is outside of the bounds of the result set then the resultant position will be pinned to -1 or count() depending on whether the value is off the front or end of the set, respectively.

This method will return true if the requested destination was reachable, otherwise, it returns false. For example, if the cursor is at currently on the second entry in the result set and move(-5) is called, the position will be pinned at -1, and false will be returned.

Parameters
`offset` | `int`: the offset to be applied from the current position.

Returns
`boolean` | whether the requested move fully succeeded.

### moveToFirst

    public abstract boolean moveToFirst ()

Move the cursor to the first row.

This method will return false if the cursor is empty.

Returns
`boolean` | whether the move succeeded.

### moveToLast

    public abstract boolean moveToLast ()

Move the cursor to the last row.

This method will return false if the cursor is empty.

Returns
`boolean` | whether the move succeeded.

### moveToNext

    public abstract boolean moveToNext ()

Move the cursor to the next row.

This method will return false if the cursor is already past the last entry in the result set.

Returns
`boolean` | whether the move succeeded.

### moveToPosition

    public abstract boolean moveToPosition (int position)

Move the cursor to an absolute position. The valid range of values is -1 <= position <= count.

This method will return true if the request destination was reachable, otherwise, it returns false.

Parameters
`position` | `int`: the zero-based position to move to.

Returns
`boolean` | whether the requested move fully succeeded.

### moveToPrevious

    public abstract boolean moveToPrevious ()

Move the cursor to the previous row.

This method will return false if the cursor is already before the first entry in the result set.

Returns
`boolean` | whether the move succeeded.

### registerContentObserver

    public abstract void registerContentObserver (ContentObserver observer)

Register an observer that is called when changes happen to the content backing this cursor. Typically the data set won't change until `requery()` is called.

Parameters
`observer` | `ContentObserver`: the object that gets notified when the content backing the cursor changes.

See also:

- `unregisterContentObserver(ContentObserver)`

### registerDataSetObserver

    public abstract void registerDataSetObserver (DataSetObserver observer)

Register an observer that is called when changes happen to the contents of the this cursors data set, for example, when the data set is changed via `requery()`, `deactivate()`, or `close()`.

Parameters
`observer` | `DataSetObserver`: the object that gets notified when the cursors data set changes.

See also:

- `unregisterDataSetObserver(DataSetObserver)`

### requery

    public abstract boolean requery ()

This method is deprecated.
Don't use this. Just request a new cursor, so you can do this asynchronously and update your list view once the new cursor comes back.

Performs the query that created the cursor again, refreshing its contents. This may be done at any time, including after a call to `deactivate()`. Since this method could execute a query on the database and potentially take a while, it could cause ANR if it is called on Main (UI) thread. A warning is printed if this method is being executed on Main thread.

Returns
`boolean` | true if the requery succeeded, false if not, in which case the cursor becomes invalid.

### respond

    public abstract Bundle respond (Bundle extras)

This is an out-of-band way for the the user of a cursor to communicate with the cursor. The structure of each bundle is entirely defined by the cursor.

One use of this is to tell a cursor that it should retry its network request after it reported an error.

Parameters
`extras` | `Bundle`: extra values, or `Bundle.EMPTY`. Never `null`.

Returns
`Bundle` | extra values, or `Bundle.EMPTY`. Never `null`.

### setExtras

    public abstract void setExtras (Bundle extras)

Sets a `Bundle` that will be returned by `getExtras()`.

Parameters
`extras` | `Bundle`: `Bundle` to set, or null to set an empty bundle.

### setNotificationUri

    public abstract void setNotificationUri (ContentResolver cr,
                    Uri uri)

Register to watch a content URI for changes. This can be the URI of a specific data row (for example, "content://my_provider_type/23"), or a a generic URI for a content type.

Calling this overrides any previous call to `setNotificationUris(android.content.ContentResolver, java.util.List)`.

Parameters
`cr` | `ContentResolver`: The content resolver from the caller's context. The listener attached to this resolver will be notified.
`uri` | `Uri`: The content URI to watch.

### setNotificationUris

    public void setNotificationUris (ContentResolver cr,
                    List<Uri> uris)

Similar to `setNotificationUri(android.content.ContentResolver, android.net.Uri)`, except this version allows to watch multiple content URIs for changes.

If this is not implemented, this is equivalent to calling `setNotificationUri(android.content.ContentResolver, android.net.Uri)` with the first URI in `uris`.

Calling this overrides any previous call to `setNotificationUri(android.content.ContentResolver, android.net.Uri)`.

Parameters
`cr` | `ContentResolver`: The content resolver from the caller's context. The listener attached to this resolver will be notified. This value cannot be `null`.
`uris` | `List`: The content URIs to watch. This value cannot be `null`.

### unregisterContentObserver

    public abstract void unregisterContentObserver (ContentObserver observer)

Unregister an observer that has previously been registered with this cursor via `registerContentObserver(ContentObserver)`.

Parameters
`observer` | `ContentObserver`: the object to unregister.

See also:

- `registerContentObserver(ContentObserver)`

### unregisterDataSetObserver

    public abstract void unregisterDataSetObserver (DataSetObserver observer)

Unregister an observer that has previously been registered with this cursor via `registerContentObserver(ContentObserver)`.

Parameters
`observer` | `DataSetObserver`: the object to unregister.

See also:

- `registerDataSetObserver(DataSetObserver)`

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