有时一行文字需要设置不同大小、颜色、等甚至字体时,我们可以使用富文本来实现。本文暂只提供文本大小,颜色,字体,换行等 *** 作的代码基类,如需其他,可按需自行实现。
class SpannableUtils(private val textView: TextView) {
val spanMode: Int = Spanned.SPAN_EXCLUSIVE_EXCLUSIVE
var enter: String? = System.getProperty("line.separator")
var texts: ArrayList = ArrayList()
var currentIndex: Int = -1
fun append(@NotNull text: String): SpannableUtils {
//打开这里可以让下一个span继承上一个字span的样式,但我感觉没什么必要
//var initArray: ArrayList = ArrayList()
//if (currentIndex >= 0) {
// initArray = texts[currentIndex].spans
//}
//texts.add(Spannable(text, initArray))
texts.add(Spannable(text, ArrayList()))
currentIndex++
return this
}
fun appendLine(): SpannableUtils {
if (enter == null) {
enter = "\n"
}
return append(enter!!)
}
private fun addSpan(span: Any): SpannableUtils {
texts[currentIndex].spans.add(span)
return this
}
fun setTextColor(@ColorInt color: Int): SpannableUtils {
return addSpan(ForegroundColorSpan(color))
}
fun setTextSize(size: Float): SpannableUtils {
return addSpan(AbsoluteSizeSpan(DensityUtil.sp2px(size)))
}
fun setTypeface(typeface: Typeface): SpannableUtils {
return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
addSpan(TypefaceSpan(typeface))
} else {
addSpan(StyleSpan(typeface.style))
}
}
fun create(): SpannableString {
if (currentIndex == -1) {
return SpannableString("")
}
var text = ""
var length = 0
texts.forEach {
text += it.text
}
val spannableString = SpannableString(text)
texts.forEach {
val textLength = it.text.length
it.spans.forEach {
spannableString.setSpan(it, length, length + textLength, spanMode)
}
length += it.text.length
}
textView.text = spannableString
return spannableString
}
class Spannable(var text: String = "", var spans: ArrayList = ArrayList())
}
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