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?
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。
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。
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,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));
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
和 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);
}
TextView
文本存储在 StringBuilder
中。StringBuilder
中。TextView
文本存储在 SpannableString
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
。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);
}
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);
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))
}
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);
}
}
}
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))
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。