Android EditText:如何在键入时应用前景颜色跨度？

Question

我在您键入文本时尝试将字体颜色应用于EditText中的文本.但是,它只是非常不一致,这意味着有时如果键入空格,该空格前面的文本将返回默认的黑色.或者如果我把光标放在一个单词的中间并开始输入整个单词改变颜色而不仅仅是我正在键入的文本.粗体,斜体和下划线似乎运作良好.我怎样才能保证只有我输入的文字会受到字体颜色的影响？

请参阅下面的"尺寸和颜色"评论...

     contentEdit.addTextChangedListener(new TextWatcher() { 
            public void afterTextChanged(Editable s) { 

                //add style as the user types if a toggle button is enabled
                ToggleButton boldButton = (ToggleButton) findViewById(R.id.bold);
                ToggleButton emButton = (ToggleButton) findViewById(R.id.italic);
                ToggleButton underlineButton = (ToggleButton) findViewById(R.id.underline);

                int position = Selection.getSelectionStart(contentEdit.getText());

                try{
                    if (position < 0){
                        position = 0;
                    }

                    if (position > 0){

                        if (styleStart > position || position > (cursorLoc + 1)){
                            //user changed cursor location, reset
                            if (position - cursorLoc > 1){
                                //user pasted text
                                styleStart = cursorLoc;
                            }
                            else{
                                styleStart = position - 1;
                            }
                        }

                        if (boldButton.isChecked()){  
                            StyleSpan[] ss = s.getSpans(styleStart, position, StyleSpan.class);

                            for (int i = 0; i < ss.length; i++) {
                                if (ss[i].getStyle() == android.graphics.Typeface.BOLD){
                                    s.removeSpan(ss[i]);
                                }
                            }
                            s.setSpan(new StyleSpan(android.graphics.Typeface.BOLD), styleStart, position, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
                        }
                        if (emButton.isChecked()){
                            StyleSpan[] ss = s.getSpans(styleStart, position, StyleSpan.class);

                            for (int i = 0; i < ss.length; i++) {
                                if (ss[i].getStyle() == android.graphics.Typeface.ITALIC){
                                    s.removeSpan(ss[i]);
                                }
                            }
                            s.setSpan(new StyleSpan(android.graphics.Typeface.ITALIC), styleStart, position, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
                        }
                        if (underlineButton.isChecked()){
                            UnderlineSpan[] ss = s.getSpans(styleStart, position, UnderlineSpan.class);

                            for (int i = 0; i < ss.length; i++) {
                                s.removeSpan(ss[i]);
                            }
                            s.setSpan(new UnderlineSpan(), styleStart, position, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
                        }

                        //SIZE AND COLOR//////////////////////////////////////////////////////
                       s.setSpan(new ForegroundColorSpan(m_color), position, position, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
                       s.setSpan(new AbsoluteSizeSpan(m_curSize, true), position, position, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
}
                }
                catch(Exception e){
                    //Toast.makeText(m_ctx, m_ctx.gets, Toast.LENGTH_LONG).show();
                    showMessage(R.string.NOTE_WARNING_STYLE,m_utils.MSGTYPE_WARNING);
                }

                cursorLoc = Selection.getSelectionStart(contentEdit.getText());
            }

Answer 1

您可以使用模式查找单词,然后将任何跨度应用于单词.

@Override
public void afterTextChanged(Editable s) {
    Spannable textSpan = s;
    final Pattern pattern = Pattern.compile("\\w+");
    final Matcher matcher = pattern.matcher(textSpan);
    while (matcher.find()) {
        start = matcher.start();
        end = matcher.end();
        textSpan.setSpan(new ForegroundColorSpan(getResources().getColor(R.color.red)), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

    }

而已.它会突出显示您键入的所有匹配单词.希望它有所帮助.

Answer 2

我将 Spannable 的开头更改position为position - 1：

//Color
s.setSpan(new ForegroundColorSpan(m_color), 
          position-1, 
          position, 
          Spannable.SPAN_INCLUSIVE_INCLUSIVE);
//Size
s.setSpan(new AbsoluteSizeSpan(m_curSize, true), 
          position-1, 
          position, 
          Spannable.SPAN_INCLUSIVE_INCLUSIVE);