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Summary: Nested Classes | Inherited Constants | Inherited Fields | Ctors | Methods | Inherited Methods

# MatrixCursor

`public class MatrixCursor`
`` `extends AbstractCursor` ``

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

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

## Summary

### Nested classes
`class` | `MatrixCursor.RowBuilder` Builds a row of values using either of these approaches: Values can be added with explicit column ordering using `add(java.lang.Object)`, which starts from the left-most column and adds one column value at a time.

### 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

### Inherited fields
From class `android.database.AbstractCursor`
`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
`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.
`byte[]` | `getBlob(int column)` Returns the value of the requested column as a byte array.
`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.
`int` | `getType(int column)` Returns data type of the given column's value.
`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.

### 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)` Copies cursor data into the window.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`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.
`Object` | `getUpdatedField(int columnIndex)` This method is deprecated. Always returns null since Cursors do not support updating rows
`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
`boolean` | `isFieldUpdated(int columnIndex)` This method is deprecated. Always returns false since Cursors do not support updating rows
`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` | `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)`.
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.

## Public constructors

### MatrixCursor

    public MatrixCursor (String[] columnNames,
                    int initialCapacity)

Constructs a new cursor with the given initial capacity.

Parameters
`columnNames` | `String`: names of the columns, the ordering of which determines column ordering elsewhere in this cursor
`initialCapacity` | `int`: in rows

### MatrixCursor

    public MatrixCursor (String[] columnNames)

Constructs a new cursor.

Parameters
`columnNames` | `String`: names of the columns, the ordering of which determines column ordering elsewhere in this cursor

## Public methods

### addRow

    public void addRow (Object[] columnValues)

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

Parameters
`columnValues` | `Object`: in the same order as the the column names specified at cursor construction time

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

### addRow

    public void addRow (Iterable<?> columnValues)

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

Parameters
`columnValues` | `Iterable`: in the same order as the the column names specified at cursor construction time

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

### 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.

### getColumnNames

    public 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 int getCount ()

Returns the numbers of rows in the cursor.

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

### getDouble

    public 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.

### getFloat

    public 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 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 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.

### getShort

    public 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 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

### isNull

    public 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.

### newRow

    public MatrixCursor.RowBuilder newRow ()

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

Returns
`MatrixCursor.RowBuilder` | builder which can be used to set the column values for the new row

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