ChipEditTextView.java 文件源码

/**
 * Show specified chip as selected. If the RecipientChip is just an email address,
 * selecting the chip will take the contents of the chip and place it at
 * the end of the RecipientEditTextView for inline editing. If the
 * RecipientChip is a complete contact, then selecting the chip
 * will change the background color of the chip, show the delete icon,
 * and a popup window with the address in use highlighted and any other
 * alternate addresses for the contact.
 * @param currentChip Chip to select.
 * @return A RecipientChip in the selected state or null if the chip
 * just contained an email address.
 */
private DrawableChip selectChip(DrawableChip currentChip) {


    // small additinal feature.
    if(!currentChip.isSelectable()) {
        return null;
    }

    CharSequence text = currentChip.getText();
    Editable editable = getText();
    Spannable spannable = getSpannable();
    DrawableChip newChip = null;

    if (currentChip.isEditable()) {
        int spanStart = spannable.getSpanStart(currentChip);
        int spanEnd = spannable.getSpanEnd(currentChip);

        spannable.removeSpan(currentChip);
        editable.delete(spanStart, spanEnd);
        setCursorVisible(true);
        setSelection(editable.length());
        editable.append(text);

        newChip = constructChipSpan(currentChip.getDelegate(), true);

    } else {
        int start = getChipStart(currentChip);
        int end = getChipEnd(currentChip);

        spannable.removeSpan(currentChip);

        try {
            newChip = constructChipSpan(currentChip.getDelegate(), true);
        } catch (NullPointerException e) {
            Log.e(TAG, e.getMessage(), e);
            return null;
        }

        QwertyKeyListener.markAsReplaced(editable, start, end, "");
        if (start == -1 || end == -1) {
            Log.d(TAG, "The chip being selected no longer exists but should.");
        } else {
            editable.setSpan(newChip, start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        }
        newChip.setSelected(true);
        if (newChip.isEditable()) {
            scrollLineIntoView(getLayout().getLineForOffset(getChipStart(newChip)));
        }

        setCursorVisible(false);
    }
    // transfer the original text.
    newChip.setOriginalText(currentChip.getOriginalText());
    return newChip;
}