样式EditText内容'在飞行'？ [英] Style EditText content 'on the fly'?

问题描述

我正在使用Android中的富文本编辑器。基本上，它有粗体，斜体和链接按钮绑定到一个EditText来改变内容的风格。如果您选择要首先创建样式的文本，然后使用此方法选择按钮，我的工作效果非常好： http://developer.android.com/guide/appendix/faq/commontasks.html#selectingtext 。

I'm working on a rich text editor in Android. Basically it has bold, italics and link buttons that are tied to an EditText to change the style of the content. I have it working great if you select the text you want to style first, and then select the button using this method: http://developer.android.com/guide/appendix/faq/commontasks.html#selectingtext.

我想要做的是它的工作就像一个富文本编辑器，你可以使用按钮作为切换来设置样式的文本，只要你想，然后再次单击切换停止使用的样式。因此，如果我想以粗体输入注意这个！，我将点击B按钮，然后开始输入文本，我键入的内容将是粗体，直到我单击B 按钮。

What I'm trying to do is have it work like a rich text editor, where you can use the buttons as a toggle to style the text for as long as you'd like, then click the toggle again to stop using the style. So if I wanted to type 'Pay attention to this!' in bold, I would click the 'B' button, then start typing the text and everything I type would be bold until I click the 'B' button again.

有关如何解决这个问题的任何想法？我希望我已经足够清楚了：）

Any ideas on how to pull this off? I hope I've been clear enough :)

推荐答案

你可以更新每个字符后， a href =http://developer.android.com/intl/fr/reference/android/text/TextWatcher.html =nofollow noreferrer> TextWatcher 和 addTextChangedListener（） 方法。

You could just update the style after every character that they type using a TextWatcher and the addTextChangedListener() method.

好吧，这只是一个裸骨骼示例代码。 p>

Ok, this is just the bare bones example code.

int mStart = -1;

// Bold onClickListener
public void onClick(View view)
{
    if(mStart == -1) mStart = mEditText.getText().length();
    else mStart = -1;
}

// TextWatcher
onTextChanged(CharSequence s, int start, int before, int count)
{
    if(mStart > 0)
    {
        int end = mEditText.getText().length();
        mEditText.getText().setSpan(new StyleSpan(android.graphics.Typeface.BOLD), mStart, end - mStart, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    }
}

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