Android Gmail API setMaxResult不起作用

Question

I set number of letters in global variable:

private static final long MAX_RESULTS_PER_REQUEST = 10;

next, I add this condition to get list query:

            List<String> labelsId = new ArrayList<>();
        labelsId.add("INBOX");

        ListMessagesResponse response = mService.users().messages().list(user)
                .setLabelIds(labelsId)
                .setMaxResults(MAX_RESULTS_PER_REQUEST)
                .execute();
        List<Message> messages = new ArrayList<Message>();
        while (response.getMessages() != null) {
            messages.addAll(response.getMessages());
            if (response.getNextPageToken() != null) {
                String pageToken = response.getNextPageToken();
                response = mService.users().messages().list(user)
                        .setPageToken(pageToken).execute();
            } else {
                break;
            }
        }

but ".setMaxResults(MAX_RESULTS_PER_REQUEST)" don't work:

Log.i("messages.size()", String.valueOf(messages.size())); //here 1644 not 10

Answer 1

You are checking the size of the messages List which keeps getting added to as you are iterating through the available pages and adding more messages to it.

The first call to response.getMessages() should be enough if you only want 10 messages returned, and you won't need the for loop.