Remove whole Spannable with backspace

问题

I have a chat application which offers the possibility to add emoticons to the text.

I have a problem with the EditText field. The emoticon images show up but if I press on the normal keyboard the backspace button, the text which I was changing to an emoticons picture shows up and I have to remove several characters until the picture goes away. I am using Spannable to do this.

I want the whole smilie go away if the user presses one time backspace.

Here the code I am using:

// This is in the keyclicked listener
{
    ...
    smilie = "(angel)";
    break;
    ...
    int cursorPosition = content.getSelectionStart();
    content.getText().insert(cursorPosition, getSmiledText(this, smilie));
    content.getText().insert(cursorPosition + smilie.length(), " ");
}

public static boolean addSmiles(Context context, Spannable spannable) {
    boolean hasChanges = false;
    for (Entry<Pattern, Integer> entry : smilies.entrySet()) {
        Matcher matcher = entry.getKey().matcher(spannable);
        while (matcher.find()) {
            boolean set = true;
            for (ImageSpan span : spannable.getSpans(matcher.start(),
                    matcher.end(), ImageSpan.class))
                if (spannable.getSpanStart(span) >= matcher.start()
                        && spannable.getSpanEnd(span) <= matcher.end())
                    spannable.removeSpan(span);
                else {
                    set = false;
                    break;
                }
            if (set) {
                hasChanges = true;
                spannable.setSpan(new ImageSpan(context, entry.getValue()),
                        matcher.start(), matcher.end(),
                        Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
            }
        }
    }
    return hasChanges;
}

public static Spannable getSmiledText(Context context, CharSequence text) {
    Spannable spannable = spannableFactory.newSpannable(text);
    addSmiles(context, spannable);
    return spannable;
}

回答1:

So you can't force the keyboard to do that- the keyboard generally isn't looking at that kind of info. What you can do is place a TextWatcher on the edit field and override afterTextChanged to detect this case and delete the additional characters needed. It will be a pain but its doable.

来源：https://stackoverflow.com/questions/17251226/remove-whole-spannable-with-backspace