String asd[]={"A","B","C","AAA","BBB","CCC"};

private static final String[] COUNTRIES = new String[] {"Belgium", "France", "Italy", "Germany", "Spain"};


ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, COUNTRIES);
MultiAutoCompleteTextView textView = (MultiAutoCompleteTextView) findViewById(R.id.edit);
textView.setAdapter(adapter);
textView.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());

public static class SemicolonTokenizer implements Tokenizer {
    public int findTokenStart(CharSequence text, int cursor) {
        int i = cursor;
        while (i > 0 && text.charAt(i - 1) != ';') {
            i--;
        }
        while (i < cursor && text.charAt(i) == ' ') {
            i++;
        }
        return i;
    }
    public int findTokenEnd(CharSequence text, int cursor) {
        int i = cursor;
        int len = text.length();
        while (i < len) {
            if (text.charAt(i) == ';') {
                return i;
            } else {
                i++;
            }
        }
        return len;
    }
    public CharSequence terminateToken(CharSequence text) {
        int i = text.length();
        while (i > 0 && text.charAt(i - 1) == ' ') {
            i--;
        }
        if (i > 0 && text.charAt(i - 1) == ';') {
            return text;
        } else {
            if (text instanceof Spanned) {
                SpannableString sp = new SpannableString(text + "; ");
                TextUtils.copySpansFrom((Spanned) text, 0, text.length(),
                                        Object.class, sp, 0);
                return sp;
            } else {
                return text + "; ";
            }
    }

textView.setTokenizer(new SemicolonTokenizer());