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

I guess you have a cursor with 20 rows and now you want to invoke a method 20 times with a cursor that contains only one row. Here is how you can do this:

Cursor c = ...;// contains many rows
if(c.moveToFirst()){
    String[] columns = c.getColumnNames();
    while(!c.isAfterLast()){ 
        MatrixCursor newCursor = new MatrixCursor(columns , 1);
        MatrixCursor.RowBuilder b = newCursor.newRow();
        for(String col: columns){
             // in case all columns are of string type. But if they are 
             // different then see my comment below 
             b.add(c.getString(c.getColumnIndex(col)));
        }
     // invoke your listener here with newCursor
    }
}

What if data type of columns is not String?

For API>=11: Just call getType() method in for loop and use switch statement to invoke appropriate get method.

For API<11: Run another query similar to this PRAGMA table_info(my_table_name) and then just fill a Map of column name and type and use it in for loop. Here is how you can read this cursor https://stackoverflow.com/a/9354401/1112882