如何在java/android中更改字符串中特定字符的颜色？

我有一根绳子

String text= //Some String That I know
String textToBeColored = //Some Letter User enters at run time

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如何更改用户在运行时在字符串中输入的特定字母的颜色

我假设您希望在字符串中突出显示用户选择的特定文本之类的内容。下面应该可以帮助你做到这一点

String text = "abcada";
String textToBeColored = "a";

String htmlText = text.replace(textToBeColored,"<font color='#c5c5c5'>"+textToBeColored +"</font>");
// Only letter a would be displayed in a different color.
txtView.setText(Html.fromHtml(htmlText);

String text=“abcada”；
字符串textToBeColored=“a”；
字符串htmlText=text.replace（textToBeColored，“+textToBeColored+”）；
//只有字母a将以不同的颜色显示。
setText（Html.fromHtml（htmlText）；

您可以用简单的方法来实现这一点

SpannableStringBuilder builder = new SpannableStringBuilder();

String red = "user's word is red";
SpannableString redSpannable= new SpannableString(red);
redSpannable.setSpan(new ForegroundColorSpan(Color.RED), 0, red.length(), 0);
builder.append(redSpannable);

mTextView.setText(builder, BufferType.SPANNABLE);

如果有任何问题，请告诉我

TextView TV = (TextView)findViewById(R.id.textView1); 
    Spannable WordtoSpan = new SpannableString("I this is just a test case");        
    WordtoSpan.setSpan(new ForegroundColorSpan(Color.RED), 4, 10, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    TV.setText(WordtoSpan);

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尝试此操作

您可以通过在SpannableStringBuilder（文本）上设置span来完成此操作

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到目前为止有什么尝试吗？我已经搜索了，发现了一些有用的东西，

txt.setText（Html.fromHtml（“您的内容”）

您也在哪里输出字符串？但问题是，我必须知道需要着色的字母。字符串在UI中如何显示？它给出了一个异常：

java.lang.IndexOutOfBoundsException:setSpan（0…9）结束于长度1之外

第4行，红色。length（）应更改为红色。length（）-1，因为数组的索引以0开头

final SpannableStringBuilder sb = new SpannableStringBuilder("text");
final ForegroundColorSpan fcs = new ForegroundColorSpan(Color.rgb(234, 123, 121));  


sb.setSpan(fcs, 0, 4, Spannable.SPAN_INCLUSIVE_INCLUSIVE); 
//0 is starting index
//4 is ending index

You can use sb as string