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# AbstractCursor

`public abstract class AbstractCursor`
`extends Object` `implements CrossProcessCursor`

java.lang.Object
↳ | android.database.AbstractCursor

Known direct subclasses AbstractWindowedCursor, MatrixCursor, MergeCursor
AbstractWindowedCursor | A base class for Cursors that store their data in `CursorWindow`s.
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.

Known indirect subclasses SQLiteCursor
SQLiteCursor | A Cursor implementation that exposes results from a query on a `SQLiteDatabase`.

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.

## Summary

### Nested classes
`class` | `AbstractCursor.SelfContentObserver` Cursors use this class to track changes others make to their URI.

### Inherited constants
From interface `android.database.Cursor`
`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

### Fields
`protected boolean` | `mClosed` This field is deprecated. Use `isClosed()` instead.
`protected ContentResolver` | `mContentResolver` This field is deprecated. Do not use.
`protected int` | `mPos` This field is deprecated. Use `getPosition()` instead.

### Public constructors
`AbstractCursor()`

### Public methods
`void` | `close()` Closes the Cursor, releasing all of its resources and making it completely invalid.
`void` | `copyStringToBuffer(int columnIndex, CharArrayBuffer buffer)` Retrieves the requested column text and stores it in the buffer provided.
`void` | `deactivate()` Deactivates the Cursor, making all calls on it fail until `requery()` is called.
`void` | `fillWindow(int position, CursorWindow window)` Copies cursor data into the window.
`byte[]` | `getBlob(int column)` Returns the value of the requested column as a byte array.
`int` | `getColumnCount()` Return total number of columns
`int` | `getColumnIndex(String columnName)` Returns the zero-based index for the given column name, or -1 if the column doesn't exist.
`int` | `getColumnIndexOrThrow(String columnName)` Returns the zero-based index for the given column name, or throws `IllegalArgumentException` if the column doesn't exist.
`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 column)` Returns the value of the requested column as a double.
`Bundle` | `getExtras()` Returns a bundle of extra values.
`abstract float` | `getFloat(int column)` Returns the value of the requested column as a float.
`abstract int` | `getInt(int column)` Returns the value of the requested column as an int.
`abstract long` | `getLong(int column)` Returns the value of the requested column as a long.
`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)`.
`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)`.
`final int` | `getPosition()` Returns the current position of the cursor in the row set.
`abstract short` | `getShort(int column)` Returns the value of the requested column as a short.
`abstract String` | `getString(int column)` Returns the value of the requested column as a String.
`int` | `getType(int column)` Returns data type of the given column's value.
`boolean` | `getWantsAllOnMoveCalls()` onMove() will only be called across processes if this method returns true.
`CursorWindow` | `getWindow()` If the cursor is backed by a `CursorWindow`, returns a pre-filled window with the contents of the cursor, otherwise null.
`final boolean` | `isAfterLast()` Returns whether the cursor is pointing to the position after the last row.
`final boolean` | `isBeforeFirst()` Returns whether the cursor is pointing to the position before the first row.
`boolean` | `isClosed()` return true if the cursor is closed
`final boolean` | `isFirst()` Returns whether the cursor is pointing to the first row.
`final boolean` | `isLast()` Returns whether the cursor is pointing to the last row.
`abstract boolean` | `isNull(int column)` Returns `true` if the value in the indicated column is null.
`final boolean` | `move(int offset)` Move the cursor by a relative amount, forward or backward, from the current position.
`final boolean` | `moveToFirst()` Move the cursor to the first row.
`final boolean` | `moveToLast()` Move the cursor to the last row.
`final boolean` | `moveToNext()` Move the cursor to the next row.
`final boolean` | `moveToPosition(int position)` Move the cursor to an absolute position.
`final boolean` | `moveToPrevious()` Move the cursor to the previous row.
`boolean` | `onMove(int oldPosition, int newPosition)` This function is called every time the cursor is successfully scrolled to a new position, giving the subclass a chance to update any state it may have.
`void` | `registerContentObserver(ContentObserver observer)` Register an observer that is called when changes happen to the content backing this cursor.
`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()`.
`boolean` | `requery()` Performs the query that created the cursor again, refreshing its contents.
`Bundle` | `respond(Bundle extras)` This is an out-of-band way for the the user of a cursor to communicate with the cursor.
`void` | `setExtras(Bundle extras)` Sets a `Bundle` that will be returned by `getExtras()`.
`void` | `setNotificationUri(ContentResolver cr, Uri notifyUri)` Specifies a content URI to watch for changes.
`void` | `setNotificationUris(ContentResolver cr, List<Uri> notifyUris)` Similar to `setNotificationUri(android.content.ContentResolver, android.net.Uri)`, except this version allows to watch multiple content URIs for changes.
`void` | `unregisterContentObserver(ContentObserver observer)` Unregister an observer that has previously been registered with this cursor via `registerContentObserver(ContentObserver)`.
`void` | `unregisterDataSetObserver(DataSetObserver observer)` Unregister an observer that has previously been registered with this cursor via `registerContentObserver(ContentObserver)`.

### Protected methods
`void` | `checkPosition()` This function throws CursorIndexOutOfBoundsException if the cursor position is out of bounds.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`Object` | `getUpdatedField(int columnIndex)` This method is deprecated. Always returns null since Cursors do not support updating rows
`boolean` | `isFieldUpdated(int columnIndex)` This method is deprecated. Always returns false since Cursors do not support updating rows
`void` | `onChange(boolean selfChange)` Subclasses must call this method when they finish committing updates to notify all observers.

### Inherited methods
From class `java.lang.Object`
`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 timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.
From interface `android.database.CrossProcessCursor`
`abstract void` | `fillWindow(int position, CursorWindow window)` Copies cursor data into the window.
`abstract CursorWindow` | `getWindow()` Returns a pre-filled window that contains the data within this cursor.
`abstract boolean` | `onMove(int oldPosition, int newPosition)` This function is called every time the cursor is successfully scrolled to a new position, giving the subclass a chance to update any state it may have.
From interface `android.database.Cursor`
`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)`.
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.

## Fields

### mClosed

    protected boolean mClosed

This field is deprecated.
Use `isClosed()` instead.

### mContentResolver

    protected ContentResolver mContentResolver

This field is deprecated.
Do not use.

### mPos

    protected int mPos

This field is deprecated.
Use `getPosition()` instead.

## Public constructors

### AbstractCursor

    public AbstractCursor ()

## Public methods

### close

    public 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 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 void deactivate ()

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.

### fillWindow

    public void fillWindow (int position,
                    CursorWindow window)

Copies cursor data into the window.

Clears the window and fills it with data beginning at the requested row position until all of the data in the cursor is exhausted or the window runs out of space.

The filled window uses the same row indices as the original cursor. For example, if you fill a window starting from row 5 from the cursor, you can query the contents of row 5 from the window just by asking it for row 5 because there is a direct correspondence between the row indices used by the cursor and the window.

The current position of the cursor, as returned by `Cursor.getPosition()`, is not changed by this method.

Parameters
`position` | `int`: The zero-based index of the first row to copy into the window.
`window` | `CursorWindow`: The window to fill.

### getBlob

    public byte[] getBlob (int column)

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

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

### getColumnCount

    public int getColumnCount ()

Return total number of columns

Returns
`int` | number of columns

### getColumnIndex

    public 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.

### getColumnIndexOrThrow

    public 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

### getColumnName

    public 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 column)

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

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

### getExtras

    public 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 column)

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
`column` | `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 column)

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
`column` | `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 column)

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

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

### getNotificationUri

    public 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 final 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 column)

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
`column` | `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 column)

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

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

### getType

    public int getType (int column)

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

Returns
`int` | column value type

### getWantsAllOnMoveCalls

    public 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().

### getWindow

    public CursorWindow getWindow ()

If the cursor is backed by a `CursorWindow`, returns a pre-filled window with the contents of the cursor, otherwise null.

Returns
`CursorWindow` | The pre-filled window that backs this cursor, or null if none.

### isAfterLast

    public final 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 final 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 boolean isClosed ()

return true if the cursor is closed

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

### isFirst

    public final 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 final 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 column)

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

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

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

### move

    public final 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 final 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 final 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 final 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 final 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 final 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.

### onMove

    public boolean onMove (int oldPosition,
                    int newPosition)

This function is called every time the cursor is successfully scrolled to a new position, giving the subclass a chance to update any state it may have. If it returns false the move function will also do so and the cursor will scroll to the beforeFirst position.

Parameters
`oldPosition` | `int`: the position that we're moving from
`newPosition` | `int`: the position that we're moving to

Returns
`boolean` | true if the move is successful, false otherwise

### registerContentObserver

    public 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.

### registerDataSetObserver

    public 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.

### requery

    public boolean requery ()

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 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 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 void setNotificationUri (ContentResolver cr,
                    Uri notifyUri)

Specifies a content URI to watch for changes.

Parameters
`cr` | `ContentResolver`: The content resolver from the caller's context.
`notifyUri` | `Uri`: The URI to watch for changes. This can be a specific row URI, or a base URI for a whole class of content.

### setNotificationUris

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

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`: This value cannot be `null`.
`notifyUris` | `List`: This value cannot be `null`.

### unregisterContentObserver

    public 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.

### unregisterDataSetObserver

    public 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.

## Protected methods

### checkPosition

    protected void checkPosition ()

This function throws CursorIndexOutOfBoundsException if the cursor position is out of bounds. Subclass implementations of the get functions should call this before attempting to retrieve data.

Throws
`` | android.database.CursorIndexOutOfBoundsException

### finalize

    protected void finalize ()

Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. A subclass overrides the `finalize` method to dispose of system resources or to perform other cleanup.

The general contract of `finalize` is that it is invoked if and when the Java™ virtual machine has determined that there is no longer any means by which this object can be accessed by any thread that has not yet died, except as a result of an action taken by the finalization of some other object or class which is ready to be finalized. The `finalize` method may take any action, including making this object available again to other threads; the usual purpose of `finalize`, however, is to perform cleanup actions before the object is irrevocably discarded. For example, the finalize method for an object that represents an input/output connection might perform explicit I/O transactions to break the connection before the object is permanently discarded.

The `finalize` method of class `Object` performs no special action; it simply returns normally. Subclasses of `Object` may override this definition.

The Java programming language does not guarantee which thread will invoke the `finalize` method for any given object. It is guaranteed, however, that the thread that invokes finalize will not be holding any user-visible synchronization locks when finalize is invoked. If an uncaught exception is thrown by the finalize method, the exception is ignored and finalization of that object terminates.

After the `finalize` method has been invoked for an object, no further action is taken until the Java virtual machine has again determined that there is no longer any means by which this object can be accessed by any thread that has not yet died, including possible actions by other objects or classes which are ready to be finalized, at which point the object may be discarded.

The `finalize` method is never invoked more than once by a Java virtual machine for any given object.

Any exception thrown by the `finalize` method causes the finalization of this object to be halted, but is otherwise ignored.

### getUpdatedField

    protected Object getUpdatedField (int columnIndex)

This method is deprecated.
Always returns null since Cursors do not support updating rows

Parameters
`columnIndex` | `int`

Returns
`Object` |

### isFieldUpdated

    protected boolean isFieldUpdated (int columnIndex)

This method is deprecated.
Always returns false since Cursors do not support updating rows

Parameters
`columnIndex` | `int`

Returns
`boolean` |

### onChange

    protected void onChange (boolean selfChange)

Subclasses must call this method when they finish committing updates to notify all observers.

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