更改TextView中一个单词的文本颜色

我正在寻找一种方法来改变在一个字的文本的颜色TextView从内Activity。

例如，与此：

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？

我知道的最简单的方法是只使用html。

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

但是，这需要您在要更改颜色时（如果？）重建TextView，这可能会引起麻烦。

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);

您必须使用spannable，这也将允许您增加某些文本的大小，使其变粗等。甚至将其放置在某些图像中。

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);

对于长字符串，您可以使用以下命令：

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

如果要更改文本（不区分大小写）String内某个特定实例的所有实例的状态，TextView可以使用StringBuilders，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文本存储在内StringBuilder。
• 将搜索到的字符串存储在中StringBuilder。
• 将妓女TextView文字存储在SpannableString
• 进行简单的操作即可查找文本中的所有String实例，TextView并在到达时进行更改。
• 将的文本值设置TextView为SpannableString。

我在Kotlin中为自己的用例实现了一个实用程序功能，也许对其他人有用。

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))
    }

用：

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);
}

我认为这对于为字符串中的单词上色更易读，也可能更有效率，因为您只需编写一次

    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);