切换编辑文本字体

Question

我正在制作一个应用程序，用户可以在单击按钮时斜体显示可伸缩文本。

// Captures Contextual Menu Clicks//
public void onContextualMenuItemClicked(MenuItem item) {
    int id = item.getItemId();
    if (id == R.id.bold) {
        // do some stuff
    }
    if (id == R.id.italic) {
        int startSelection = noteContent.getSelectionStart();
        int endSelection = noteContent.getSelectionEnd();
        Spannable spannable = noteContent.getText();
        spannable.setSpan(new StyleSpan(Typeface.ITALIC) , startSelection , endSelection , 0);

        StyleSpanRemover spanRemover = new StyleSpanRemover();
        spanRemover.RemoveStyle(spannable,startSelection,endSelection,Typeface.ITALIC);
    }

这段代码让它变成斜体

        int startSelection = noteContent.getSelectionStart();
        int endSelection = noteContent.getSelectionEnd();
        Spannable spannable = noteContent.getText();
        spannable.setSpan(new StyleSpan(Typeface.ITALIC) , startSelection , endSelection , 0);

让它变成非斜体

        StyleSpanRemover spanRemover = new StyleSpanRemover();
        spanRemover.RemoveStyle(spannable,startSelection,endSelection,Typeface.ITALIC

我希望用户单击相同的按钮来斜体和非斜体。我可以使用什么if语句来获取可伸缩选定单词的字体?这样它就知道是否要斜体

更新:这是我现在的

     int startSelection = noteContent.getSelectionStart();
        int endSelection = noteContent.getSelectionEnd();
        Spannable spannable = noteContent.getText();
        StyleSpan[] spans = spannable.getSpans(startSelection, endSelection, StyleSpan.class);
        if (spans.length == 0) {
            spannable.setSpan(new StyleSpan(Typeface.ITALIC), startSelection, endSelection , 0);
        } else {
            spannable.setSpan(new StyleSpan(Typeface.NORMAL), startSelection, endSelection , 0);
        }

即使代码运行代码

  spannable.setSpan(new StyleSpan(Typeface.NORMAL), startSelection, endSelection , 0);

并将其设置为正常。但是它不会设置跨度。长度为0，所以我不能再斜体了如何设置跨度。

Answer 1

您可以使用getSpans(startSelection, endSelection, StyleSpan.class)查看在选择范围中存在哪些span。基于此，您可以决定是否(以及如何)斜体文本。注意，用户可能会突出显示包含正常文本和斜体文本的部分。

编辑

StyleSpan[] spans = spannable.getSpans(startSelection, endSelection, StyleSpan.class);
if (spans.length == 0) {
    // no spans, italicize text here
} else {
    // TODO
}