How to clone or freeze an Android database cursor

Question

I have a custom cursor adapter, and I would like to pass each \'row\' of the cursor back to the application (via a registered callback which is working).

I know I co

Answer 1

Based on Anand's answer, this should work without having to specify the column names / projection:

public static Cursor cloneCursor(Cursor oldCursor) {

    if (oldCursor == null) {

        return null;

    }
    else {

        /**
         * Remember the cursor position
         */
        int originalCursorPosition = oldCursor.getPosition();

        String[] projection = oldCursor.getColumnNames();
        MatrixCursor newCursor = new MatrixCursor(projection);

        int numColumns = oldCursor.getColumnCount();

        while (oldCursor.moveToNext()) {

            /**
             * Create the new row object
             */
            Object[] newRow = new Object[numColumns];

            /**
             * Populate each column in the new row
             */
            for (int columnIndex = 0; columnIndex < numColumns; columnIndex++) {

                /**
                 * Detect the field type
                 */
                int fieldType = oldCursor.getType(columnIndex);

                /**
                 * Use the field type to populate the row correctly
                 */
                if (fieldType == Cursor.FIELD_TYPE_BLOB) {
                    newRow[columnIndex] = oldCursor.getBlob(columnIndex);
                }
                else if (fieldType == Cursor.FIELD_TYPE_FLOAT) {
                    newRow[columnIndex] = oldCursor.getDouble(columnIndex);
                }
                else if (fieldType == Cursor.FIELD_TYPE_INTEGER) {
                    newRow[columnIndex] = oldCursor.getLong(columnIndex);
                }
                else if (fieldType == Cursor.FIELD_TYPE_STRING) {
                    newRow[columnIndex] = oldCursor.getString(columnIndex);
                }
                else if (fieldType == Cursor.FIELD_TYPE_NULL) {
                    newRow[columnIndex] = null;
                }
                else {
                    throw new RuntimeException("Unknown fieldType (" + fieldType + ") for column" + columnIndex);
                }

            }

            /**
             * Add the new row to the new cursor
             */
            newCursor.addRow(newRow);

        }

        /**
         * Move both cursors to the position that oldCursor was in before this method was called
         */
        oldCursor.moveToPosition(originalCursorPosition);
        newCursor.moveToPosition(originalCursorPosition);

        /**
         * Return the cloned cursor
         */
        return newCursor;

    }

}

UPDATE

getInt(...) changed to getLong(...).

getFloat(...) changed to getDouble(...)