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MatrixCursor
open class MatrixCursor : AbstractCursor
A mutable cursor implementation backed by an array of Objects. Use newRow() to add rows. Automatically expands internal capacity as needed.
Summary
| Nested classes |
| open |
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. This follows the same ordering as the column names specified at cursor construction time.
- Column and value pairs can be offered for possible inclusion using
add(java.lang.String,java.lang.Object). If the cursor includes the given column, the value will be set for that column, otherwise the value is ignored. This approach is useful when matching data to a custom projection.
Undefined values are left as null.
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| Public constructors |
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Constructs a new cursor.
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Constructs a new cursor with the given initial capacity.
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| Inherited functions |
From class AbstractCursor
Unit |
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.
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Unit |
close()
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Unit |
copyStringToBuffer(columnIndex: Int, buffer: CharArrayBuffer!)
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Unit |
deactivate()
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Unit |
fillWindow(position: Int, window: CursorWindow!)
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Unit |
finalize()
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Int |
getColumnCount()
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Int |
getColumnIndex(columnName: String!)
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Int |
getColumnIndexOrThrow(columnName: String!)
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String! |
getColumnName(columnIndex: Int)
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Bundle! |
getExtras()
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Uri! |
getNotificationUri()
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MutableList<Uri!>? |
getNotificationUris()
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Int |
getPosition()
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Any! |
getUpdatedField(columnIndex: Int)
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Boolean |
getWantsAllOnMoveCalls()
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CursorWindow! |
getWindow()
If the cursor is backed by a CursorWindow, returns a pre-filled window with the contents of the cursor, otherwise null.
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Boolean |
isAfterLast()
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Boolean |
isBeforeFirst()
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Boolean |
isClosed()
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Boolean |
isFieldUpdated(columnIndex: Int)
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Boolean |
isFirst()
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Boolean |
isLast()
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Boolean |
move(offset: Int)
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Boolean |
moveToFirst()
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Boolean |
moveToLast()
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Boolean |
moveToNext()
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Boolean |
moveToPosition(position: Int)
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Boolean |
moveToPrevious()
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Unit |
onChange(selfChange: Boolean)
Subclasses must call this method when they finish committing updates to notify all observers.
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Boolean |
onMove(oldPosition: Int, newPosition: Int)
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.
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Unit |
registerContentObserver(observer: ContentObserver!)
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Unit |
registerDataSetObserver(observer: DataSetObserver!)
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Boolean |
requery()
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Bundle! |
respond(extras: Bundle!)
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Unit |
setExtras(extras: Bundle!)
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Unit |
setNotificationUri(cr: ContentResolver!, notifyUri: Uri!)
Specifies a content URI to watch for changes.
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Unit |
setNotificationUris(cr: ContentResolver, notifyUris: MutableList<Uri!>)
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).
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Unit |
unregisterContentObserver(observer: ContentObserver!)
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Unit |
unregisterDataSetObserver(observer: DataSetObserver!)
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Public constructors
MatrixCursor
MatrixCursor(columnNames: Array<String!>!)
Constructs a new cursor.
| Parameters |
columnNames |
Array<String!>!: names of the columns, the ordering of which determines column ordering elsewhere in this cursor |
MatrixCursor
MatrixCursor(
columnNames: Array<String!>!,
initialCapacity: Int)
Constructs a new cursor with the given initial capacity.
| Parameters |
columnNames |
Array<String!>!: names of the columns, the ordering of which determines column ordering elsewhere in this cursor |
initialCapacity |
Int: in rows |
Public methods
addRow
open fun addRow(columnValues: MutableIterable<*>!): Unit
Adds a new row to the end with the given column values. Not safe for concurrent use.
| Parameters |
columnValues |
MutableIterable<*>!: in the same order as the the column names specified at cursor construction time |
| Exceptions |
java.lang.IllegalArgumentException |
if columnValues.size() != columnNames.length |
addRow
open fun addRow(columnValues: Array<Any!>!): Unit
Adds a new row to the end with the given column values. Not safe for concurrent use.
| Parameters |
columnValues |
Array<Any!>!: in the same order as the the column names specified at cursor construction time |
| Exceptions |
java.lang.IllegalArgumentException |
if columnValues.length != columnNames.length |
getBlob
open fun getBlob(column: Int): ByteArray!
| Parameters |
columnIndex |
the zero-based index of the target column. Value is 0 or greater |
| Return |
ByteArray! |
the value of that column as a byte array. |
getColumnNames
open fun getColumnNames(): Array<String!>!
| Return |
Array<String!>! |
the names of the columns returned in this query. |
getCount
open fun getCount(): Int
| Return |
Int |
the number of rows in the cursor. Value is 0 or greater |
getDouble
open fun getDouble(column: Int): Double
| Parameters |
columnIndex |
the zero-based index of the target column. Value is 0 or greater |
| Return |
Double |
the value of that column as a double. |
getFloat
open fun getFloat(column: Int): Float
| Parameters |
columnIndex |
the zero-based index of the target column. Value is 0 or greater |
| Return |
Float |
the value of that column as a float. |
getInt
open fun getInt(column: Int): Int
| Parameters |
columnIndex |
the zero-based index of the target column. Value is 0 or greater |
| Return |
Int |
the value of that column as an int. |
getLong
open fun getLong(column: Int): Long
| Parameters |
columnIndex |
the zero-based index of the target column. Value is 0 or greater |
| Return |
Long |
the value of that column as a long. |
getShort
open fun getShort(column: Int): Short
| Parameters |
columnIndex |
the zero-based index of the target column. Value is 0 or greater |
| Return |
Short |
the value of that column as a short. |
getString
open fun getString(column: Int): String!
| Parameters |
columnIndex |
the zero-based index of the target column. Value is 0 or greater |
| Return |
String! |
the value of that column as a String. |
getType
open fun getType(column: Int): Int
| Parameters |
columnIndex |
the zero-based index of the target column. Value is 0 or greater |
isNull
open fun isNull(column: Int): Boolean
| Parameters |
columnIndex |
the zero-based index of the target column. Value is 0 or greater |
| Return |
Boolean |
whether the column value is null. |
newRow
open fun newRow(): MatrixCursor.RowBuilder!
Adds a new row to the end and returns a builder for that row. Not safe for concurrent use.
Content and code samples on this page are subject to the licenses described in the Content License. Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
Last updated 2025-02-10 UTC.
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