android.text.Selection#SELECTION_END源码实例Demo

@Override
public void setSpan(Object what, int start, int end, int flags) {
    // Do not add any spans that affect the character appearance of a mention (i.e. they overlap
    // with a MentionSpan). This helps prevent mentions from having a red underline due to the spell
    // checker. Note: SuggestionSpan was added in ICS, and different keyboards may use other kinds
    // of spans (i.e. the Motorola SpellCheckerMarkupSpan). Therefore, we cannot just filter out
    // SuggestionSpans, but rather, any span that would change the appearance of our MentionSpans.
    if (what instanceof CharacterStyle) {
        MentionSpan[] mentionSpans = getSpans(start, end, MentionSpan.class);
        if (mentionSpans != null && mentionSpans.length > 0) {
            return;
        }
    }

    // Ensure that the start and end points are set at zero initially
    // Note: This issue was seen on a Gingerbread device (start and end were both -1) and
    // prevents the device from crashing.
    if ((what == Selection.SELECTION_START || what == Selection.SELECTION_END) && length() == 0) {
        start = 0;
        end = 0;
    }

    super.setSpan(what, start, end, flags);
}
 

public void onSpanChanged(Spannable buf,
                          Object what, int s, int e, int start, int stop) {
    if (what == Selection.SELECTION_END) {
        buf.removeSpan(TextKeyListener.ACTIVE);
        removeTimeouts(buf);
    }
}
 

@Override
public void onSpanChanged(Spannable text, Object what, int ostart, int oend, int nstart, int nend) {
    if (disabled || block) return;
    if (what == Selection.SELECTION_END) {
        // Selection end changed from ostart to nstart. Trigger a check.
        log("onSpanChanged: selection end moved from "+ostart+" to "+nstart);
        log("onSpanChanged: block is "+block);
        boolean b = block;
        block = true;
        if (!isPopupShowing() && policy.shouldShowPopup(text, nstart)) {
            showPopup(policy.getQuery(text));
        }
        block = b;
    }
}
 

public void onSpanChanged(Spannable s, Object what, int start, int end,
                          int st, int en) {
    if (what == Selection.SELECTION_END) {
        s.removeSpan(ACTIVE);
    }
}
 

private boolean isNonIntermediateSelectionSpan(final Spanned text, final Object span) {
    return (Selection.SELECTION_START == span || Selection.SELECTION_END == span)
            && (text.getSpanFlags(span) & Spanned.SPAN_INTERMEDIATE) == 0;
}