java.lang.Object | ||
android.database.AbstractCursor | CrossProcessCursor |
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.
AbstractCursor.SelfContentObserver | Cursors use this class to track changes others make to their URI. |
protected | boolean | mClosed | |||
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<Long, Map<String, Object>> | mUpdatedRows | This HashMap contains a mapping from Long rowIDs to another Map that maps from String column names to new values. |
AbstractCursor() |
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 | deactivateInternal() | |||||
void | fillWindow(int position, CursorWindow window) | |||||
Copy data from cursor to CursorWindow | ||||||
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. | ||||||
int | getColumnIndexOrThrow(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 | 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. | ||||||
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 | ||||||
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 | 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). |
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. |
position | start position of data |
---|
If the native content of that column is not blob exception may throw
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 the value in the indicated column is null.
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 false if the cursor is empty.
This method will return false if the cursor is empty.
This method will return false if the cursor is already past the last entry in the result set.
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 before the first entry in the result set.
oldPosition | the position that we're moving from |
---|---|
newPosition | the position that we're moving to |
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. |
Note: The virtual machine assumes that the implementation in class Object is empty.
columnIndex | the column index of the field to retrieve |
---|
columnIndex | the column index of the field to check |
---|
Copyright 2007 Google Inc. | Build 0.9_r1-98467 - 14 Aug 2008 18:48 |