Michaël Michaël - 1 month ago 18
Android Question

Get the field value with a Cursor

I'm creating an application and I have problems with

Cursor
. I have an
SQLiteDatabase
that returns me a
Cursor
when I try to fetch the values with this function:

public Cursor fetchOption(long rowId) throws SQLException {

Cursor mCursor = mDb.query(true, DATABASE_TABLE, new String[] {KEY_ROWID,
KEY_TITLE, KEY_BODY}, KEY_ROWID + "=" + rowId, null,
null, null, null, null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;

}


I don't know how to obtain the value of the field in the
Cursor
. If I do that like so:

String a = mOptionDb.fetchOption(0).getColumnName(0).toString();
String b = mOptionDb.fetchOption(0).getColumnName(1).toString();
String c = mOptionDb.fetchOption(0).getColumnName(2).toString();


I only obtain the name of the columns (
_id, title, body
) but not the values. Any suggestions on how to achieve this?

Answer

I think you can forget about checking for null.

Instead check if there is data and then access the columns using the cursor:

Cursor cursor = fetchOption(0);

if (cursor.moveToFirst()) // data?
   System.out.println(cursor.getString(cursor.getColumnIndex("title")); 

cursor.close(); // that's important too, otherwise you're gonna leak cursors

It might also make sense to read an android tutorial. The notepad tutorial seems to fit the bill: http://developer.android.com/guide/tutorials/notepad/index.html