android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0

Question

I am using custom adapter extending cursor adapter for displaying data in listview, to display particular phone number i have passed the id to a method in database class but

Answer 1

Whenever you are dealing with Cursors, ALWAYS check for null and check for moveToFirst() without fail.

if( cursor != null && cursor.moveToFirst() ){
    num = cursor.getString(cursor.getColumnIndex("ContactNumber"));
    cursor.close(); 
}

Place logs appropriately to see whether it is returning null or an empty cursor. According to that check your query.

Update Put both the checks in a single statement as mentioned by Jon in the comment below.

Update 2 Put the close() call within the valid cursor scope.

Answer 2

try to uninstall the app and then again test it... actually the sqlite db is created only once when the app is first install... so if you think your logic is current then reinstalling the app will do the trick for you. !!!!

Answer 3

In case people are still looking:

Instead of searching for "ContactNumber" try searching for Phone.NUMBER. The tutorial has the code with more details: http://developer.android.com/training/basics/intents/result.html

Answer 4

First check this Condition before fetching data

if(cursor!=null && cursor.getCount()>0){
  cursor.moveToFirst();
  num = cursor.getString(cursor.getColumnIndex("ContactNumber")); 
}

Answer 5

Check the return value from moveToFirst(), before you try to read anything from the cursor. It looks as if no results are being returned.

Answer 6

a save schema to query Cursors is

// just one
Cursor cursor = db.query(...);
if (cursor != null) {
    if (cursor.moveToFirst()) {
        value = cursor.getSomething();
    }
    cursor.close();
}

// multiple columns
Cursor cursor = db.query(...);
if (cursor != null) {
    while (cursor.moveToNext()) {
        values.add(cursor.getSomething());
    }
    cursor.close();
}