| java.lang.Object | ||
| android.database.AbstractCursor | Cursor | |
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.
Nested Classes| AbstractCursor.SelfContentObserver | Cursors use this class to track changes others make to their URI. |
Known Direct Subclasses
Known Indirect Subclasses| protected | ContentResolver | mContentResolver | |||
| protected | Long | mCurrentRowID | |||
| protected | int | mPos | |||
| protected | int | mRowIdColumnIndex | This must be set to the index of the row ID column by any subclass that wishes to support updates. | ||
| protected | HashMap | mUpdatedRows | This HashMap contains a mapping from Long rowIDs to another Map that maps from String column names to new values. |
| AbstractCursor() |
| void | abortUpdates() | ||||
| Reverts all updates made to the cursor since the last call to commitUpdates. | |||||
| void | close() | ||||
| Closes the Cursor, releasing all of its resources and making it completely invalid. | |||||
| boolean | commitUpdates(Map values) | ||||
| Atomically commits all updates to the backing store, as well as the updates included in values. | |||||
| boolean | commitUpdates() | ||||
| Atomically commits all updates to the backing store. | |||||
| abstract | int | count() | |||
| Returns the numbers of rows in the cursor. | |||||
| void | deactivate() | ||||
| Deactivates the Cursor, making all calls on it fail until requery() is called. | |||||
| boolean | deleteRow() | ||||
| Removes the row at the current cursor position from the underlying data store. | |||||
| final | boolean | first() | |||
| Move the cursor to the first row. | |||||
| int | getColumnIndex(String columnName) | ||||
| Returns the zero-based index for the given column name. | |||||
| 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 | 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. | |||||
| 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. | |||||
| boolean | getWantsAllOnMoveCalls() | ||||
| onMove() will only be called across processes if this method returns true. | |||||
| boolean | hasUpdates() | ||||
Returns true if there are pending updates that have not yet been committed. |
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| 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. | |||||
| 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. |
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| final | boolean | last() | |||
| Move the cursor to the last row. | |||||
| final | boolean | move(int offset) | |||
| Move the cursor by a relative amount, forward or backward, from the current position. | |||||
| final | boolean | moveTo(int position) | |||
| Move the cursor to an absolute position. | |||||
| final | boolean | next() | |||
| Move the cursor to the next row. | |||||
| final | int | position() | |||
| Returns the current position of the cursor in the row set. | |||||
| final | boolean | prev() | |||
| Move the cursor to the previous row. | |||||
| 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. | |||||
| boolean | supportsUpdates() | ||||
Returns true if the cursor supports updates. |
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| 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). | |||||
| boolean | update(int columnIndex, Object obj) | ||||
| boolean | updateDouble(int columnIndex, double value) | ||||
| Updates the value for the given column in the row the cursor is currently pointing at. | |||||
| boolean | updateFloat(int columnIndex, float value) | ||||
| Updates the value for the given column in the row the cursor is currently pointing at. | |||||
| boolean | updateInt(int columnIndex, int value) | ||||
| Updates the value for the given column in the row the cursor is currently pointing at. | |||||
| boolean | updateLong(int columnIndex, long value) | ||||
| Updates the value for the given column in the row the cursor is currently pointing at. | |||||
| boolean | updateShort(int columnIndex, short value) | ||||
| Updates the value for the given column in the row the cursor is currently pointing at. | |||||
| boolean | updateString(int columnIndex, String value) | ||||
| Updates the value for the given column in the row the cursor is currently pointing at. | |||||
| boolean | updateToNull(int columnIndex) | ||||
| Removes the value for the given column in the row the cursor is currently pointing at. | |||||
| void | checkPosition() | ||||
| This function throws CursorIndexOutOfBoundsException if the cursor position is out of bounds. | |||||
| void | finalize() | ||||
| Called by the virtual machine when there are no longer any (non-weak) references to the receiver. | |||||
| Object | getUpdatedField(int columnIndex) | ||||
| This function returns the uncommitted updated value for the field at columnIndex. | |||||
| 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. | |||||
| 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. | |||||
Methods inherited
from class
java.lang.Object
Methods inherited
from interface
android.database.Cursor
This method will return false if the cursor is empty.
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).
These values may only change when requery is called.
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).
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).
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).
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).
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).
true if there are pending updates that have not yet been committed.
true if there are pending updates that have not yet been committed.
true if the value in the indicated column is null.
This method will return false if the cursor is empty.
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.
This method will return true if the request destination was reachable, otherwise, it returns false.
This method will return false if the cursor is already past the last entry in the result set.
This method will return false if the cursor is already before the first entry in the result set.
One use of this is to tell a cursor that it should retry its network request after it reported an error.
| cr | The content resolver from the caller's context. |
|---|---|
| notifyUri | The URI to watch for changes. This can be a specific row URI, or a base URI for a whole class of content. |
true if the cursor supports updates.
Note: The virtual machine assumes that the implementation in class Object is empty.
| columnIndex | the column index of the field to retrieve |
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| columnIndex | the column index of the field to check |
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| oldPosition | the position that we're moving from |
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| newPosition | the position that we're moving to |