public class

MatrixCursor

extends AbstractCursor

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

Class Overview

A mutable cursor implementation backed by an array of Objects. Use newRow() to add rows. Automatically expands internal capacity as needed.

Summary

Nested Classes
class	MatrixCursor.RowBuilder	Builds a row, starting from the left-most column and adding one column value at a time.

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Inherited Fields

From class android.database.AbstractCursor

Public Constructors
	MatrixCursor(String[] columnNames, int initialCapacity) Constructs a new cursor with the given initial capacity.
	MatrixCursor(String[] columnNames) Constructs a new cursor.

Public Methods
void	addRow(Object[] columnValues) Adds a new row to the end with the given column values.
void	addRow(Iterable<?> columnValues) Adds a new row to the end with the given column values.
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.
int	getCount() Returns the numbers of rows in the cursor.
double	getDouble(int column) Returns the value of the requested column as a double.
float	getFloat(int column) Returns the value of the requested column as a float.
int	getInt(int column) Returns the value of the requested column as an int.
long	getLong(int column) Returns the value of the requested column as a long.
short	getShort(int column) Returns the value of the requested column as a short.
String	getString(int column) Returns the value of the requested column as a String.
boolean	isNull(int column) Returns `true` if the value in the indicated column is null.
MatrixCursor.RowBuilder	newRow() Adds a new row to the end and returns a builder for that row.

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Inherited Methods

From class android.database.AbstractCursor

void	checkPosition() This function throws CursorIndexOutOfBoundsException if the cursor position is out of bounds.
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) Copy data from cursor to CursorWindow
void	finalize() Is called before the object's memory is being reclaimed by the VM.
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.
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.
Object	getUpdatedField(int columnIndex) This function returns the uncommitted updated value for the field at columnIndex.
boolean	getWantsAllOnMoveCalls() onMove() will only be called across processes if this method returns true.
CursorWindow	getWindow() returns a pre-filled window, return NULL if no such window
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
boolean	isFieldUpdated(int columnIndex) This function returns true if the field has been updated and is used in conjunction with getUpdatedField(int) to allow subclasses to support reading uncommitted updates.
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.
void	onChange(boolean selfChange) Subclasses must call this method when they finish committing updates to notify all observers.
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	setNotificationUri(ContentResolver cr, Uri notifyUri) Specifies a content URI to watch 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).

From class java.lang.Object

Object	clone() Creates and returns a copy of this `Object`.
boolean	equals(Object o) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Is called before the object's memory is being reclaimed by the VM.
final Class<? extends Object>	getClass() Returns the unique instance of Class which represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait(long millis, int nanos) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.
final void	wait(long millis) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.
final void	wait() Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object.

From interface android.database.CrossProcessCursor

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() Deactivates the Cursor, making all calls on it fail until requery() is called.
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 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 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() Performs the query that created the cursor again, refreshing its contents.
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	setNotificationUri(ContentResolver cr, Uri uri) Register to watch a content URI 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).

Public Constructors

public MatrixCursor (String[] columnNames, int initialCapacity)

Since: API Level 1

Constructs a new cursor with the given initial capacity.

Parameters

columnNames	names of the columns, the ordering of which determines column ordering elsewhere in this cursor
initialCapacity	in rows

public MatrixCursor (String[] columnNames)

Since: API Level 1

Constructs a new cursor.

Parameters

columnNames	names of the columns, the ordering of which determines column ordering elsewhere in this cursor

Public Methods

public void addRow (Object[] columnValues)

Since: API Level 1

Adds a new row to the end with the given column values. Not safe for concurrent use.

Parameters

columnValues	in the same order as the the column names specified at cursor construction time

Throws

IllegalArgumentException	if `columnValues.length != columnNames.length`

public void addRow (Iterable<?> columnValues)

Since: API Level 1

Adds a new row to the end with the given column values. Not safe for concurrent use.

Parameters

columnValues	in the same order as the the column names specified at cursor construction time

Throws

IllegalArgumentException	if `columnValues.size() != columnNames.length`

public String[] getColumnNames ()

Since: API Level 1

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

the names of the columns returned in this query.

public int getCount ()

Since: API Level 1

Returns the numbers of rows in the cursor.

Returns

the number of rows in the cursor.

public double getDouble (int column)

Since: API Level 1

Returns the value of the requested column as a double.

If the native content of that column is not numeric the result will be the result of passing the column value to Double.valueOf(x).

Parameters

column	the zero-based index of the target column.

Returns

the value of that column as a double.

public float getFloat (int column)

Since: API Level 1

Returns the value of the requested column as a float.

If the native content of that column is not numeric the result will be the result of passing the column value to Float.valueOf(x).

Parameters

column	the zero-based index of the target column.

Returns

the value of that column as a float.

public int getInt (int column)

Since: API Level 1

Returns the value of the requested column as an int.

If the native content of that column is not numeric the result will be the result of passing the column value to Integer.valueOf(x).

Parameters

column	the zero-based index of the target column.

Returns

the value of that column as an int.

public long getLong (int column)

Since: API Level 1

Returns the value of the requested column as a long.

If the native content of that column is not numeric the result will be the result of passing the column value to Long.valueOf(x).

Parameters

column	the zero-based index of the target column.

Returns

the value of that column as a long.

public short getShort (int column)

Since: API Level 1

Returns the value of the requested column as a short.

If the native content of that column is not numeric the result will be the result of passing the column value to Short.valueOf(x).

Parameters

column	the zero-based index of the target column.

Returns

the value of that column as a short.

public String getString (int column)

Since: API Level 1

Returns the value of the requested column as a String.

If the native content of that column is not text the result will be the result of passing the column value to String.valueOf(x).

Parameters

column	the zero-based index of the target column.

Returns

the value of that column as a String.

public boolean isNull (int column)

Since: API Level 1

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

Parameters

column	the zero-based index of the target column.

Returns

whether the column value is null.

public MatrixCursor.RowBuilder newRow ()

Since: API Level 1

Adds a new row to the end and returns a builder for that row. Not safe for concurrent use.

Returns

builder which can be used to set the column values for the new row

Interfaces

Classes

Enums

Exceptions

MatrixCursor

Class Overview

Summary

Public Constructors

public MatrixCursor (String[] columnNames, int initialCapacity)

Parameters

public MatrixCursor (String[] columnNames)

Parameters

Public Methods

public void addRow (Object[] columnValues)

Parameters

Throws

public void addRow (Iterable<?> columnValues)

Parameters

Throws

public String[] getColumnNames ()

Returns

public int getCount ()

Returns

public double getDouble (int column)

Parameters

Returns

public float getFloat (int column)

Parameters

Returns

public int getInt (int column)

Parameters

Returns

public long getLong (int column)

Parameters

Returns

public short getShort (int column)

Parameters

Returns

public String getString (int column)

Parameters

Returns

public boolean isNull (int column)

Parameters

Returns

public MatrixCursor.RowBuilder newRow ()

Returns