更改 TextView 中一个单词的文本颜色

问题描述 投票:0回答:11

我正在寻找一种方法来从

TextView
中更改
Activity
中单个单词的文本颜色。

例如,这样:

String first = "This word is ";
String next = "red"
TextView t = (TextView) findViewById(R.id.textbox);
t.setText(first + next);

如何将

next
文本的颜色更改为红色?

android string colors textview
11个回答
187
投票

我知道的最简单的方法就是使用 html。

String first = "This word is ";
String next = "<font color='#EE0000'>red</font>";
t.setText(Html.fromHtml(first + next));

但这将要求您在(如果?)想要更改颜色时重建 TextView,这可能会引起麻烦。


79
投票
t.setText(first + next, BufferType.SPANNABLE);
Spannable s = (Spannable)t.getText();
int start = first.length();
int end = start + next.length();
s.setSpan(new ForegroundColorSpan(0xFFFF0000), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

你必须使用spannable,这还可以让你增加一些文本的大小,使其加粗等等......甚至可以放入一些图像。


45
投票

像这样使用 SpannableStringBuilder :

SpannableStringBuilder builder = new SpannableStringBuilder();

SpannableString str1= new SpannableString("Text1");
str1.setSpan(new ForegroundColorSpan(Color.RED), 0, str1.length(), 0);
builder.append(str1);

SpannableString str2= new SpannableString(appMode.toString());
str2.setSpan(new ForegroundColorSpan(Color.GREEN), 0, str2.length(), 0);
builder.append(str2);

TextView tv = (TextView) view.findViewById(android.R.id.text1);
tv.setText( builder, TextView.BufferType.SPANNABLE);

6
投票

对于长字符串,你可以使用这个:

String help = getString(R.string.help);
help = help.replace("some word", "<font color='#EE0000'>some word</font>");
txtDesc.setText(Html.fromHtml(help));

3
投票

如果您想更改

String
文本中特定
TextView
的所有实例(不区分大小写),您可以使用
StringBuilder
SpannableString
,如下所示:

StringBuilder textBuilder = new StringBuilder(myTextView.getText().toString());
StringBuilder searchedTextBuilder = new StringBuilder((mySearchedString));
SpannableString spannableString = new SpannableString(myTextView.getText().toString());

int counter = 0;
int index = 0;

for (int i = 0;i < textBuilder.length() - mySearchedString.length() - 1;i++)
{
    counter = 0;
    if (Character.toLowerCase(textBuilder.charAt(i)) == Character.toLowerCase(searchedTextBuilder.charAt(index)))
    {
        counter++;
        index++;
        for (int j = 1,z = i + 1;j < mySearchedString.length() - 1;j++,z++)
        {
            if (Character.toLowerCase(textBuilder .charAt(z)) == Character.toLowerCase(searchedTextBuilder .charAt(index)))
            {
                counter++;
                index++;
            }
            else
            {
                index++;
                if (index % mySearchedString.length() == 0)
                {
                    index = 0;
                }
                break;
             }
        }
        if (counter == mySearchedString.length() - 1) // A match
        {
            spannableString.setSpan(new ForegroundColorSpan(Color.RED), i,
                                i + mySearchedString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); // Do the change you want(In this case changing the fore ground color to red)
            index = 0;
            continue;
        }
        else
        {
            index = 0;
            continue;
        }
    }
}
myTextView.setText(spannableString);

}

  • 将整个
    TextView
    文本存储在
    StringBuilder
    中。
  • 将搜索到的字符串存储在
    StringBuilder
    中。
  • 将整个
    TextView
    文本存储在
    SpannableString
  • 进行一个简单的操作来查找
    String
    文本内的所有
    TextView
    实例,并在到达时更改它们。
  • TextView
    的文本值设置为
    SpannableString

2
投票

用途:

makeTextBold("Your order is accepted","accepted", textView);
makeTextBold("Your order is canceled","canceled", textView);

功能:

public static void makeTextBold(String sentence, String word, AppCompatTextView textView) {
    SpannableStringBuilder builder = new SpannableStringBuilder();
    int startIndex = sentence.indexOf(word.toLowerCase().trim());
    int endIndex = startIndex + word.toLowerCase().trim().length();
    SpannableString spannableString = new SpannableString(sentence);
    StyleSpan boldSpan = new StyleSpan(Typeface.BOLD);
    spannableString.setSpan(boldSpan, startIndex, endIndex, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); //To make text Bold
    spannableString.setSpan(new ForegroundColorSpan(Color.RED), startIndex, endIndex, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); //To change color of text
    builder.append(spannableString);
    textView.setText(builder, TextView.BufferType.SPANNABLE);
}

2
投票

我认为这更具可读性 用于为字符串中的单词着色 它也可能更有效一点,因为你只写一次

    String str  = YOUR_STRING
    Spannable s = new SpannableString(str);
    int start = str.indexOf(err_word_origin);
    int end =  start + err_word_origin.length();
    s.setSpan(new ForegroundColorSpan(Color.BLUE), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    YOUR_TEXT_VIEW.setText(s , TextView.BufferType.SPANNABLE);

1
投票

我在 Kotlin 中为我自己的用例实现了一个实用函数,也许对其他人也有用。

fun getCusomTextWithSpecificTextWithDiffColor(textToBold: String, fullText: String,
                                                  targetColor: Int) =
            SpannableStringBuilder(fullText).apply {
                setSpan(ForegroundColorSpan(targetColor),
                        fullText.indexOf(textToBold),
                        (fullText.indexOf(textToBold) + textToBold.length),
                        Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
            }

我如何使用它:

context?.let {
        infoMessage.text = AppUtils.getCusomTextWithSpecificTextWithDiffColor(
                wordAsBold,
                completeSentence, ContextCompat.getColor(it, R.color.white))
    }

1
投票

我找到了这个最佳答案 https://stackoverflow.com/a/53573169/14250778 只是更改了一行以支持以大写字母开头的单词

public void setHighLightedText(TextView tv, String textToHighlight) {
        // added "toLowerCase()" to support words that starts with uppercase letter
        String tvt = tv.getText().toString().toLowerCase();
        int ofe = tvt.indexOf(textToHighlight, 0);
        Spannable wordToSpan = new SpannableString(tv.getText());
        for (int ofs = 0; ofs < tvt.length() && ofe != -1; ofs = ofe + 1) {
            ofe = tvt.indexOf(textToHighlight, ofs);
            if (ofe == -1)
                break;
            else {
                // set color here
                wordToSpan.setSpan(new BackgroundColorSpan(0xFFFFFF00), ofe, ofe + textToHighlight.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
                tv.setText(wordToSpan, TextView.BufferType.SPANNABLE);
            }
        }
    }

0
投票

我的解决方案扩展:

    fun coloredText(
    baseText: String,
    coloredText: String,
    targetColor: Int
): SpannableStringBuilder {
    val transformText = "$baseText $coloredText"
    return SpannableStringBuilder(transformText).apply {
        setSpan(
            ForegroundColorSpan(targetColor),
            transformText.indexOf(coloredText),
            (transformText.indexOf(coloredText) + coloredText.length),
            Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
        )
    }
}

使用方法

binding.mytextView.title = coloredText(
            baseText = getString(R.string.my_title),
            coloredText = getString(R.string.my_title_colored_part),
            targetColor = ContextCompat.getColor(requireContext(), R.color.blue))

0
投票

你可以这么简单:

<string>what ever <font color="#121212">IMPORTANT</font> text you want </string>

对于这样的结果:

然后,您可以使用更多字符串资源,例如粗体、斜体或其他支持的资源。

https://developer.android.com/guide/topics/resources/string-resource

我是android新手...但是你们为这些小事情付出了太多的努力和很少的文档。

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