How to customize the “chips” auto-suggesting mechanism, as used on Gmail's recipients field?

Question

Background

I\'ve searched for a way to have a similar look & feel to the Gmail receipients field, which allows auto-filling of items in a really cool way:

Answer 1

I've succeeded adding the functionality of adding a recipient. The only thing to remember is to call it only after the view got its size (example of how to do it here) :

/** adds a recipient to the view. note that it should be called when the view has determined its size */
public void addRecipient(final RecipientEntry entry) {
    if (entry == null)
        return;
    clearComposingText();

    final int end = getSelectionEnd();
    final int start = mTokenizer.findTokenStart(getText(), end);

    final Editable editable = getText();
    QwertyKeyListener.markAsReplaced(editable, start, end, "");
    final CharSequence chip = createChip(entry, false);
    if (chip != null && start >= 0 && end >= 0) {
        editable.replace(start, end, chip);
    }
    sanitizeBetween();
}

private void submitItemAtPosition(final int position) {
    final RecipientEntry entry = createValidatedEntry(getAdapter().getItem(position));
    if (entry == null)
        return;
    addRecipient(entry);
}

And, for deletion:

/** removes a chip of a recipient from the view */
public void removeRecipient(final RecipientEntry entry) {
    final DrawableRecipientChip[] chips = getSpannable().getSpans(0, getText().length(),
            DrawableRecipientChip.class);
    final List chipsToRemove = new ArrayList();
    for (final DrawableRecipientChip chip : chips)
        if (chip.getDataId() == entry.getDataId())
            chipsToRemove.add(chip);
    for (final DrawableRecipientChip chip : chipsToRemove)
        removeChip(chip);
}

and as I've written before, for getting the list of contactIds that are currently inside the view, use "getContactIds()" . Another alternative is:

/** returns a collection of all of the chips' items. key is the contact id, and the value is the recipient itself */
public Map getChosenRecipients() {
    final Map result = new HashMap();
    final DrawableRecipientChip[] chips = getSortedRecipients();
    if (chips != null)
        for (final DrawableRecipientChip chip : chips) {
            // if(result.)
            final long contactId = chip.getContactId();
            if (!result.containsKey(contactId))
                result.put(contactId, chip.getEntry());
        }
    return result;
}

Maybe I should post the code on Github.

The only thing I miss now is a good listener to the chips themselves : when a chip is added, removed and replaced. for most of the cases I can detect it, but not when the user presses backspace and removes a chip.

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EDIT: also added the listener. now I've found a bug in searching of contacts. it seems to search the normal English letters as if they were phone numbers.

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EDIT: I've decided to put a sample and a library on GitHub, here . Hope to update it with more useful features soon.

I would really be happy for any contribution to the code.