是否有可能在TextView中设置文本跨度的颜色?
我想做一些类似于Twitter应用程序的事情,其中一部分文本是蓝色的。见下图:
(来源:twimg.com)
是否有可能在TextView中设置文本跨度的颜色?
我想做一些类似于Twitter应用程序的事情,其中一部分文本是蓝色的。见下图:
(来源:twimg.com)
当前回答
下面的内容非常适合我
tvPrivacyPolicy = (TextView) findViewById(R.id.tvPrivacyPolicy);
String originalText = (String)tvPrivacyPolicy.getText();
int startPosition = 15;
int endPosition = 31;
SpannableString spannableStr = new SpannableString(originalText);
UnderlineSpan underlineSpan = new UnderlineSpan();
spannableStr.setSpan(underlineSpan, startPosition, endPosition, Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
ForegroundColorSpan backgroundColorSpan = new ForegroundColorSpan(Color.BLUE);
spannableStr.setSpan(backgroundColorSpan, startPosition, endPosition, Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
StyleSpan styleSpanItalic = new StyleSpan(Typeface.BOLD);
spannableStr.setSpan(styleSpanItalic, startPosition, endPosition, Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
tvPrivacyPolicy.setText(spannableStr);
以上代码的输出
其他回答
有一个用于创建Spannable的工厂,并避免强制转换,就像这样:
Spannable span = Spannable.Factory.getInstance().newSpannable("text");
您可以在Kotlin中使用扩展函数
fun CharSequence.colorizeText(
textPartToColorize: CharSequence,
@ColorInt color: Int
): CharSequence = SpannableString(this).apply {
val startIndexOfText = this.indexOf(textPartToColorize.toString())
setSpan(ForegroundColorSpan(color), startIndexOfText, startIndexOfText.plus(textPartToColorize.length), 0)
}
用法:
val colorizedText = "this text will be colorized"
val myTextToColorize = "some text, $colorizedText continue normal text".colorizeText(colorizedText,ContextCompat.getColor(context, R.color.someColor))
viewBinding.myTextView.text = myTextToColorize
First Part **Second Part should be Bold** last Part
此文本应该使用SpannableString进行更改
import android.graphics.Typeface.BOLD
import android.text.Spannable
import android.text.Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
import android.text.SpannableString
import android.text.style.BackgroundColorSpan
import android.text.style.ForegroundColorSpan
import android.text.style.StyleSpan
val firstPart = "First Part "
val secondPart = "Second Part should be Bold"
val thirdPart = " last Part"
val finalString = firstPart + secondPart + thirdPart
val sb: Spannable = SpannableString(finalString).also {
// ... Change text Colour
it.setSpan(
ForegroundColorSpan(getColor(requireContext(), R.color.pink)),
finalString.indexOf(secondPart),
finalString.indexOf(secondPart) + secondPart.length,
SPAN_EXCLUSIVE_EXCLUSIVE
)
// ... Make the text Bold
it.setSpan(
StyleSpan(BOLD),
finalString.indexOf(secondPart),
finalString.indexOf(secondPart) + secondPart.length,
SPAN_EXCLUSIVE_EXCLUSIVE
)
// ... Change Background Colour
it.setSpan(
BackgroundColorSpan(getColor(requireContext(), R.color.lightPink)),
finalString.indexOf(secondPart) - 1,
finalString.indexOf(secondPart) + secondPart.length + 1,
SPAN_EXCLUSIVE_EXCLUSIVE
)
}
yourTextView.text = sb
当我试图理解一个新概念时,我总是发现视觉例子很有帮助。
背景颜色
SpannableString spannableString = new SpannableString("Hello World!");
BackgroundColorSpan backgroundSpan = new BackgroundColorSpan(Color.YELLOW);
spannableString.setSpan(backgroundSpan, 0, spannableString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
textView.setText(spannableString);
前景颜色
SpannableString spannableString = new SpannableString("Hello World!");
ForegroundColorSpan foregroundSpan = new ForegroundColorSpan(Color.RED);
spannableString.setSpan(foregroundSpan, 0, spannableString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
textView.setText(spannableString);
结合
SpannableString spannableString = new SpannableString("Hello World!");
ForegroundColorSpan foregroundSpan = new ForegroundColorSpan(Color.RED);
BackgroundColorSpan backgroundSpan = new BackgroundColorSpan(Color.YELLOW);
spannableString.setSpan(foregroundSpan, 0, 8, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spannableString.setSpan(backgroundSpan, 3, spannableString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
textView.setText(spannableString);
进一步的研究
解释SPAN_EXCLUSIVE_EXCLUSIVE等Span标志的含义 Android Spanned, SpannedString, Spannable, SpannableString和CharSequence
现在您可以使用CodeView库轻松地突出显示不同颜色的模式,例如,用您只需要编写的蓝色突出显示文本中的所有url
CodeView codeView = findViewById(R.id.codeview);
codeView.addSyntaxPattern(Patterns.WEB_URL, Color.BLUE);
codeView.setTextHighlighted(text);
CodeView存储库URL: https://github.com/amrdeveloper/codeview