Michaël Michaël - 2 months ago 18
Android Question

Cursor : get the field value (Android)

I have problems with Cursor in my Android application.
I have a SQLiteDatabase that return me Cursor when I try to fetch the values with :

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;

}


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

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 obtain the name of the columns (_id, title, body) but not the value.
How can I resolve that?

Thank you in advance for your answer.
Michaƫl

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