android - Edittext 的粗体/正常状态

Question

对于我的 Edittext，我正在为用户创建能够将选定文本设置为粗体的选项，但用户也应该能够再次“取消加粗”相同的选定文本。

此功能还包括斜体、下划线、描边，但稍后会添加。

使文本加粗的代码有效，但我不知道如何取消所选文本的加粗或如何检查文本是否已经加粗。

  CharacterStyle cs;
    int start = editText.getSelectionStart();
    int end = editText.getSelectionEnd();
    SpannableStringBuilder ssb = new    SpannableStringBuilder(editText.getText());

    switch(item.getItemId()) {

        case R.id.bold:


            cs = new StyleSpan(Typeface.BOLD);
            ssb.setSpan(cs, start, end, 1);
            editText.setText(ssb);
            return true;

Answer 1

使用在网络上找到的算法解决:https://code.google.com/archive/p/droid-writer/

int selectionStart = editText.getSelectionStart();
int selectionEnd = editText.getSelectionEnd();

if (selectionStart > selectionEnd) {
        int temp = selectionEnd;
        selectionEnd = selectionStart;
        selectionStart = temp;
    }


    if (selectionEnd > selectionStart) {
        Spannable str = editText.getText();
        boolean exists = false;
        StyleSpan[] styleSpans;

        switch (item.getItemId()) {
            case R.id.bold:
                styleSpans = str.getSpans(selectionStart, selectionEnd, StyleSpan.class);

                // If the selected text-part already has BOLD style on it, then
                // we need to disable it
                for (int i = 0; i < styleSpans.length; i++) {
                    if (styleSpans[i].getStyle() == android.graphics.Typeface.BOLD) {
                        str.removeSpan(styleSpans[i]);
                        exists = true;
                    }
                }

                // Else we set BOLD style on it
                if (!exists) {
                    str.setSpan(new StyleSpan(android.graphics.Typeface.BOLD), selectionStart, selectionEnd,
                            Spannable.SPAN_EXCLUSIVE_INCLUSIVE);
                }

                editText.setSelection(selectionStart, selectionEnd);
                break;