Question

I am using this to populate some fields from a database.

private void populateField() {

if(mRowId != null ){

    Cursor Message = mDbHelper.fetchScheduledTask(mRowId);
    startManagingCursor(Message);
    Log.e("ROWID", mRowId.toString());
    String commaText = (Message.getString(Message.getColumnIndexOrThrow(SmsDbAdapter.KEY_NUMBERS)));
    numbers.setText(commaText);

When the activity is paused then resumed i get the error

10-17 11:15:13.123: ERROR/AndroidRuntime(15432): Caused by: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0

It points to this line of code.

String commaText = (Message.getString(TextMessage.getColumnIndexOrThrow(SmsDbAdapter.KEY_NUMBERS)));

How can i get rid or be defensive against this error.

Answer 1

You need to check if the cursor is empty before using it.

if (Message.moveToFirst()) {
    String commaText = (Message.getString(Message.getColumnIndexOrThrow(SmsDbAdapter.KEY_NUMBERS)));
    numbers.setText(commaText);
    // Whatever else you want to do with the cursor
}

moveToFirst() will return false if there are no items in the cursor.