SpannableStringBuiler encapsulation Kotlin

preface

SpannableStringBuilder has the same functionality as SpannableString, but SpannableStringBuilder can be concatenated using setSpan.

Start: specifies the start position of the Span. End: specifies the end position of the Span. Flags: The values can be four spannable. SPAN_INCLUSIVE_EXCLUSIVE: SPAN_INCLUSIVE_INCLUSIVE: spannable.span_inclusive_inclusive: spannable.span_inclusive_inclusive: spannable.span_inclusive_inclusive: SPAN_EXCLUSIVE_EXCLUSIVE: spannable.SPAN_exclusive_EXCLUSIVE: spannable.SPAN_exclusive_exclusive: spannable.span_exclusive_exclusive: spannable.span_exclusive_exclusive: Does not include the front does not include Spannable. SPAN_EXCLUSIVE_INCLUSIVE: does not include the front, behind, including: the corresponding various Span, different Span corresponding to different styles. Known available classes are: BackgroundColorSpan: text background color ForegroundColorSpan: text color MaskFilterSpan: Modifier effects, such as BlurMaskFilter relief RasterizerSpan: StrikethroughSpan: deletion lines SuggestionSpan: equivalent to placeholder UnderlineSpan: Underline AbsoluteSizeSpan: Text font (absolute size) DynamicDrawableSpan: Sets the picture based on text baseline or bottom alignment. ImageSpan: relative size (text font) ScaleXSpan: Based on the X axis to scale the StyleSpan: bold, italic, etc. SubscriptSpan: TextAppearanceSpan (including font, size, style and color) TypefaceSpan (URLSpan) : Text hyperlink ClickableSpan: Click eventCopy the code

Simple Usage Example

Initialize SpannableString or SpannableStringBuilder and then set the corresponding setPan to achieve the corresponding effect.

SpannableString SpannableString = new SpannableString(" What to set "); ForegroundColorSpan colorSpan = new ForegroundColorSpan(Color.parseColor("#009ad6")); spannableString.setSpan(colorSpan, 0, 8, Spannable.SPAN_EXCLUSIVE_INCLUSIVE); ((TextView)findViewById(R.id.mode1)).setText(spannableString);Copy the code

For details, see: powerful SpannableStringBuilder

Encapsulation using

For many functions can be encapsulated, simplified use, here uses the extension function, more convenient to use in Kotlin, but can also be used in Java, using the following:

In the first case, the content to be set is already a complete piece of content

Note: the first SRC is initialized by default. If you continue to initialize SRC, the previous setting will be invalid and only the last one will take effect. Both target and range are used to determine the range of text to be changed.

Sets the effect for the entire string

SRC and target are equal to the text of TextView by default

// For the entire text set method 1,textView has already set the content, SizeSpan (textSize = 20f) tvtvone2. typeSpan(SRC = "all bold ",target =" all bold ", type = SsbKtx.type_bold)Copy the code

Set some text effects

There are three types of type, corresponding to bold, tilt, and bold tilt

// tvtv2. typeSpan(range = 2.. TypeSpan (target = "part ",type = ssBKtx.type_bold) // Set the bold tilt effect tvtv3. typeSpan(range = 0.. 4,type = SsbKtx.type_bold_italic)Copy the code

Set multiple effects for the same text

For multiple effects on the same part, only set SRC for the first one. Subsequent Settings will invalidate the previous ones.

// tvTv4.typeSpan(range = 0.. 4,type = SsbKtx.type_bold_italic) // .foregroundColorIntSpan(range = 0.. 4,color = Color.GREEN) // .strikethroughSpan(range = 0.. Tvtv4.typespan (SRC = "SRC ", range = 0.. tvtv4.typespan (SRC =" SRC ", range = 0.. 4,type = SsbKtx.type_bold_italic) .foregroundColorIntSpan(range = 0.. 4,color = Color.GREEN) .strikethroughSpan(range = 0.. 4)Copy the code

Set different effects for different text

tvTv5.typeSpan(range = 0.. 4,type = SsbKtx.type_bold_italic) .foregroundColorIntSpan(range = 7.. 11,color = Color.BLUE)Copy the code

Set part click

tvTv6.clickIntSpan(range = 0.. 4){ Toast.makeText(this, "hello", Toast.LENGTH_SHORT).show() }Copy the code

Set up some hyperlinks

tvTv7.urlSpan(range = 0.. 4,url = "https://www.baidu.com")Copy the code

In the second case, concatenate to a complete string

Spliced into complete content

AppendTypeSpan (" bold ", ssbktx.type_bold).strikethroughspan (target = "bold ")// Perform multiple effects on the same part of the text AppendForegroundColorIntSpan (" change font Color, Color. RED)Copy the code

If you want to do multiple effects on the concatenated content, you can call the corresponding method after it, as long as the Traget or Range is correct.

The complete code

object SsbKtx {
    const val flag = SpannableStringBuilder.SPAN_EXCLUSIVE_EXCLUSIVE
    const val type_bold = Typeface.BOLD
    const val type_italic = Typeface.ITALIC
    const val type_bold_italic = Typeface.BOLD_ITALIC

}
//-------------------CharSequence相关扩展-----------------------
/**
 *CharSequence不为 null 或者 empty
 */
fun CharSequence?.isNotNullOrEmpty() = !isNullOrEmpty()

/**
 *获取一段文字在文字中的范围
 * @param target
 * @return
 */
fun CharSequence.range(target: CharSequence): IntRange {
    val start = this.indexOf(target.toString())
    return start..(start + target.length)
}

/**
 *将一段指定的文字改变大小
 * @return
 */
fun CharSequence.sizeSpan(range: IntRange, textSize: Int): CharSequence {
    return SpannableStringBuilder(this).apply {
        setSpan(AbsoluteSizeSpan(textSize), range.first, range.last, SsbKtx.flag)
    }
}

/**
 *将一段指定的文字,设置类型,是否加粗,倾斜
 * @return
 */
fun CharSequence.typeSpan(range: IntRange, type: Int): CharSequence {
    return SpannableStringBuilder(this).apply {
        setSpan(StyleSpan(type), range.first, range.last, SsbKtx.flag)
    }
}

/**
 *设置下划线
 * @param range
 * @return
 */
fun CharSequence.underlineSpan(range: IntRange): CharSequence {
    return SpannableStringBuilder(this).apply {
        setSpan(UnderlineSpan(), range.first, range.last, SsbKtx.flag)
    }
}

/**
 *设置删除线
 * @param range
 * @return
 */
fun CharSequence.strikethroughSpan(range: IntRange): CharSequence {
    return SpannableStringBuilder(this).apply {
        setSpan(StrikethroughSpan(), range.first, range.last, SsbKtx.flag)
    }
}

/**
 *设置文字颜色
 * @param range
 * @return
 */
fun CharSequence.foregroundColorSpan(range: IntRange, color: Int = Color.RED): CharSequence {
    return SpannableStringBuilder(this).apply {
        setSpan(ForegroundColorSpan(color), range.first, range.last, SsbKtx.flag)
    }
}

/**
 *设置文字背景色
 * @param range
 * @return
 */
fun CharSequence.backgroundColorSpan(range: IntRange, color: Int = Color.RED): CharSequence {
    return SpannableStringBuilder(this).apply {
        setSpan(BackgroundColorSpan(color), range.first, range.last, SsbKtx.flag)
    }
}

/**
 *设置引用线颜色
 * @param range
 * @return
 */
fun CharSequence.quoteColorSpan(range: IntRange, color: Int = Color.RED): CharSequence {
    return SpannableStringBuilder(this).apply {
        setSpan(QuoteSpan(color), range.first, range.last, SsbKtx.flag)
    }
}

/**
 *设置字体大小比例
 * @param range
 * @return
 */
fun CharSequence.proportionSpan(range: IntRange, proportion: Float): CharSequence {
    return SpannableStringBuilder(this).apply {
        setSpan(RelativeSizeSpan(proportion), range.first, range.last, SsbKtx.flag)
    }
}

/**
 *设置横向字体大小比例
 * @param range
 * @return
 */
fun CharSequence.proportionXSpan(range: IntRange, proportion: Float): CharSequence {
    return SpannableStringBuilder(this).apply {
        setSpan(ScaleXSpan(proportion), range.first, range.last, SsbKtx.flag)
    }
}

/**
 *设置上标
 * @param range
 * @return
 */
fun CharSequence.superscriptSpan(range: IntRange): CharSequence {
    return SpannableStringBuilder(this).apply {
        setSpan(SuperscriptSpan(), range.first, range.last, SsbKtx.flag)
    }
}

/**
 *设置下标
 * @param range
 * @return
 */
fun CharSequence.subscriptSpan(range: IntRange): CharSequence {
    return SpannableStringBuilder(this).apply {
        setSpan(SubscriptSpan(), range.first, range.last, SsbKtx.flag)
    }
}

/**
 *设置字体
 * @param range
 * @return
 */
fun CharSequence.fontSpan(range: IntRange, font: String): CharSequence {
    return SpannableStringBuilder(this).apply {
        setSpan(TypefaceSpan(font), range.first, range.last, SsbKtx.flag)
    }
}

@RequiresApi(Build.VERSION_CODES.P)
fun CharSequence.fontSpan(range: IntRange, font: Typeface): CharSequence {
    return SpannableStringBuilder(this).apply {
        setSpan(TypefaceSpan(font), range.first, range.last, SsbKtx.flag)
    }
}

/**
 *设置对齐方式
 * @param range
 * @return
 */
fun CharSequence.alignSpan(range: IntRange, align: Layout.Alignment): CharSequence {
    return SpannableStringBuilder(this).apply {
        setSpan(AlignmentSpan.Standard(align), range.first, range.last, SsbKtx.flag)
    }
}

/**
 *设置url,超链接
 * @param range
 * @return
 */
fun CharSequence.urlSpan(range: IntRange, url: String): CharSequence {
    return SpannableStringBuilder(this).apply {
        setSpan(URLSpan(url), range.first, range.last, SsbKtx.flag)
    }
}

/**
 *设置click,将一段文字中指定range的文字添加颜色和点击事件
 * @param range
 * @return
 */
fun CharSequence.clickSpan(
    range: IntRange,
    color: Int = Color.RED,
    isUnderlineText: Boolean = false,
    clickAction: () -> Unit
): CharSequence {
    return SpannableString(this).apply {
        val clickableSpan = object : ClickableSpan() {
            override fun onClick(widget: View) {
                clickAction()
            }

            override fun updateDrawState(ds: TextPaint) {
                ds.color = color
                ds.isUnderlineText = isUnderlineText
            }
        }
        setSpan(clickableSpan, range.first, range.last, SsbKtx.flag)
    }
}


//-------------------TextView相关扩展--------------------------
/**
 *设置目标文字大小, src,target 为空时,默认设置整个 text
 * @return
 */
fun TextView?.sizeSpan(
    src: CharSequence? = this?.text,
    target: CharSequence? = this?.text,
    range: IntRange? = null,
    @DimenRes textSize: Int
): TextView? {
    return when {
        this == null -> this
        src.isNullOrEmpty() -> this
        target.isNullOrEmpty() && range == null -> this
        textSize == 0 -> this
        range != null -> {
            text = src.sizeSpan(range, ResUtils.getDimensionPixelSize(textSize))
            this
        }
        target.isNotNullOrEmpty() -> {
            text = src.sizeSpan(src.range(target!!), ResUtils.getDimensionPixelSize(textSize))
            this
        }
        else -> this
    }
}

/**
 *设置目标文字大小, src,target 为空时,默认设置整个 text
 * @return
 */
fun TextView?.sizeSpan(
    src: CharSequence? = this?.text,
    target: CharSequence? = this?.text,
    range: IntRange? = null,
    textSize: Float
): TextView? {
    return when {
        this == null -> this
        src.isNullOrEmpty() -> this
        target.isNullOrEmpty() && range == null -> this
        textSize == 0f -> this
        range != null -> {
            text = src.sizeSpan(range, DensityUtils.dp2px(textSize))
            this
        }
        target.isNotNullOrEmpty() -> {
            text = src.sizeSpan(src.range(target!!), DensityUtils.dp2px(textSize))
            this
        }
        else -> this
    }
}

/**
 *追加内容设置字体大小
 * @param str
 * @param textSize
 * @return
 */
fun TextView?.appendSizeSpan(str: String?, textSize: Float): TextView? {
    str?.let {
        this?.append(it.sizeSpan(0..it.length, DensityUtils.dp2px(textSize)))
    }
    return this
}

fun TextView?.appendSizeSpan(str: String?, @DimenRes textSize: Int): TextView? {
    str?.let {
        this?.append(it.sizeSpan(0..it.length, ResUtils.getDimensionPixelSize(textSize)))
    }
    return this
}

/**
 *设置目标文字类型(加粗,倾斜,加粗倾斜),src,target 为空时,默认设置整个 text
 * @return
 */
fun TextView?.typeSpan(
    src: CharSequence? = this?.text,
    target: CharSequence? = this?.text,
    range: IntRange? = null,
    type: Int
): TextView? {
    return when {
        this == null -> this
        src.isNullOrEmpty() -> this
        target.isNullOrEmpty() && range == null -> this
        range != null -> {
            text = src.typeSpan(range, type)
            this
        }
        target.isNotNullOrEmpty() -> {
            text = src.typeSpan(src.range(target!!), type)
            this
        }
        else -> this
    }
}

fun TextView?.appendTypeSpan(str: String?, type: Int): TextView? {
    str?.let {
        this?.append(it.typeSpan(0..it.length, type))
    }
    return this
}

/**
 *设置目标文字下划线
 * @return
 */
fun TextView?.underlineSpan(
    src: CharSequence? = this?.text,
    target: CharSequence? = this?.text,
    range: IntRange? = null
): TextView? {
    return when {
        this == null -> this
        src.isNullOrEmpty() -> this
        target.isNullOrEmpty() && range == null -> this
        range != null -> {
            text = src.underlineSpan(range)
            this
        }
        target.isNotNullOrEmpty() -> {
            text = src.underlineSpan(src.range(target!!))
            this
        }
        else -> this
    }
}

fun TextView?.appendUnderlineSpan(str: String?): TextView? {
    str?.let {
        this?.append(it.underlineSpan(0..it.length))
    }
    return this
}

/**
 *设置目标文字删除线
 * @return
 */
fun TextView?.strikethroughSpan(
    src: CharSequence? = this?.text,
    target: CharSequence? = this?.text,
    range: IntRange? = null
): TextView? {
    return when {
        this == null -> this
        src.isNullOrEmpty() -> this
        target.isNullOrEmpty() && range == null -> this
        range != null -> {
            text = src.strikethroughSpan(range)
            this
        }
        target.isNotNullOrEmpty() -> {
            text = src.strikethroughSpan(src.range(target!!))
            this
        }
        else -> this
    }
}

fun TextView?.appendStrikethroughSpan(str: String?): TextView? {
    str?.let {
        this?.append(it.strikethroughSpan(0..it.length))
    }
    return this
}

/**
 *设置目标文字颜色
 * @return
 */
fun TextView?.foregroundColorIntSpan(
    src: CharSequence? = this?.text,
    target: CharSequence? = this?.text,
    range: IntRange? = null,
    color: Int
): TextView? {
    return when {
        this == null -> this
        src.isNullOrEmpty() -> this
        target.isNullOrEmpty() && range == null -> this
        range != null -> {
            text = src.foregroundColorSpan(range, color)
            this
        }
        target.isNotNullOrEmpty() -> {
            text = src.foregroundColorSpan(src.range(target!!), color)
            this
        }
        else -> this
    }
}

fun TextView?.appendForegroundColorIntSpan(str: String?, color: Int): TextView? {
    str?.let {
        this?.append(it.foregroundColorSpan(0..it.length, color))
    }
    return this
}

/**
 *设置目标文字颜色
 * @return
 */
fun TextView?.foregroundColorSpan(
    src: CharSequence? = this?.text,
    target: CharSequence? = this?.text,
    range: IntRange? = null,
    @ColorRes color: Int
): TextView? {
    return when {
        this == null -> this
        src.isNullOrEmpty() -> this
        target.isNullOrEmpty() && range == null -> this
        range != null -> {
            text = src.foregroundColorSpan(range, ResUtils.getColor(color))
            this
        }
        target.isNotNullOrEmpty() -> {
            text = src.foregroundColorSpan(src.range(target!!), ResUtils.getColor(color))
            this
        }
        else -> this
    }
}

fun TextView?.appendForegroundColorSpan(str: String?, @ColorRes color: Int): TextView? {
    str?.let {
        this?.append(it.foregroundColorSpan(0..it.length, ResUtils.getColor(color)))
    }
    return this
}

/**
 *设置目标文字背景颜色
 * @return
 */
fun TextView?.backgroundColorIntSpan(
    src: CharSequence? = this?.text,
    target: CharSequence? = this?.text,
    range: IntRange? = null,
    color: Int
): TextView? {
    return when {
        this == null -> this
        src.isNullOrEmpty() -> this
        target.isNullOrEmpty() && range == null -> this
        range != null -> {
            text = src.backgroundColorSpan(range, color)
            this
        }
        target.isNotNullOrEmpty() -> {
            text = src.backgroundColorSpan(src.range(target!!), color)
            this
        }
        else -> this
    }
}

fun TextView?.appendBackgroundColorIntSpan(str: String?, color: Int): TextView? {
    str?.let {
        this?.append(it.backgroundColorSpan(0..it.length, color))
    }
    return this
}

/**
 *设置目标文字背景颜色
 * @return
 */
fun TextView?.backgroundColorSpan(
    src: CharSequence? = this?.text,
    target: CharSequence? = this?.text,
    range: IntRange? = null,
    @ColorRes color: Int
): TextView? {
    return when {
        this == null -> this
        src.isNullOrEmpty() -> this
        target.isNullOrEmpty() && range == null -> this
        range != null -> {
            text = src.backgroundColorSpan(range, ResUtils.getColor(color))
            this
        }
        target.isNotNullOrEmpty() -> {
            text = src.backgroundColorSpan(src.range(target!!), ResUtils.getColor(color))
            this
        }
        else -> this
    }
}

fun TextView?.appendBackgroundColorSpan(str: String?, @ColorRes color: Int): TextView? {
    str?.let {
        this?.append(it.backgroundColorSpan(0..it.length, ResUtils.getColor(color)))
    }
    return this
}

/**
 *设置目标文字引用线颜色
 * @return
 */
fun TextView?.quoteColorIntSpan(
    src: CharSequence? = this?.text,
    target: CharSequence? = this?.text,
    range: IntRange? = null,
    color: Int
): TextView? {
    return when {
        this == null -> this
        src.isNullOrEmpty() -> this
        target.isNullOrEmpty() && range == null -> this
        range != null -> {
            text = src.quoteColorSpan(range, color)
            this
        }
        target.isNotNullOrEmpty() -> {
            text = src.quoteColorSpan(src.range(target!!), color)
            this
        }
        else -> this
    }
}

fun TextView?.appendQuoteColorIntSpan(str: String?, color: Int): TextView? {
    str?.let {
        this?.append(it.quoteColorSpan(0..it.length, color))
    }
    return this
}

/**
 *设置目标文字引用线颜色
 * @return
 */
fun TextView?.quoteColorSpan(
    src: CharSequence? = this?.text,
    target: CharSequence? = this?.text,
    range: IntRange? = null,
    @ColorRes color: Int
): TextView? {
    return when {
        this == null -> this
        src.isNullOrEmpty() -> this
        target.isNullOrEmpty() && range == null -> this
        range != null -> {
            text = src.quoteColorSpan(range, ResUtils.getColor(color))
            this
        }
        target.isNotNullOrEmpty() -> {
            text = src.quoteColorSpan(src.range(target!!), ResUtils.getColor(color))
            this
        }
        else -> this
    }
}

fun TextView?.appendQuoteColorSpan(str: String?, @ColorRes color: Int): TextView? {
    str?.let {
        this?.append(it.quoteColorSpan(0..it.length, ResUtils.getColor(color)))
    }
    return this
}

/**
 *设置目标文字字体大小比例
 * @return
 */
fun TextView?.proportionSpan(
    src: CharSequence? = this?.text,
    target: CharSequence? = this?.text,
    range: IntRange? = null,
    proportion: Float
): TextView? {
    return when {
        this == null -> this
        src.isNullOrEmpty() -> this
        target.isNullOrEmpty() && range == null -> this
        range != null -> {
            text = src.proportionSpan(range, proportion)
            this
        }
        target.isNotNullOrEmpty() -> {
            text = src.proportionSpan(src.range(target!!), proportion)
            this
        }
        else -> this
    }
}

fun TextView?.appendProportionSpan(str: String?, proportion: Float): TextView? {
    str?.let {
        this?.append(it.proportionSpan(0..it.length, proportion))
    }
    return this
}

/**
 *设置目标文字字体横向大小比例
 * @return
 */
fun TextView?.proportionXSpan(
    src: CharSequence? = this?.text,
    target: CharSequence? = this?.text,
    range: IntRange? = null,
    proportion: Float
): TextView? {
    return when {
        this == null -> this
        src.isNullOrEmpty() -> this
        target.isNullOrEmpty() && range == null -> this
        range != null -> {
            text = src.proportionXSpan(range, proportion)
            this
        }
        target.isNotNullOrEmpty() -> {
            text = src.proportionXSpan(src.range(target!!), proportion)
            this
        }
        else -> this
    }
}

fun TextView?.appendProportionXSpan(str: String?, proportion: Float): TextView? {
    str?.let {
        this?.append(it.proportionXSpan(0..it.length, proportion))
    }
    return this
}

/**
 *设置目标文字字体上标
 * @return
 */
fun TextView?.superscriptSpan(
    src: CharSequence? = this?.text,
    target: CharSequence? = this?.text,
    range: IntRange? = null
): TextView? {
    return when {
        this == null -> this
        src.isNullOrEmpty() -> this
        target.isNullOrEmpty() && range == null -> this
        range != null -> {
            text = src.superscriptSpan(range)
            this
        }
        target.isNotNullOrEmpty() -> {
            text = src.superscriptSpan(src.range(target!!))
            this
        }
        else -> this
    }
}

fun TextView?.appendSuperscriptSpan(str: String?): TextView? {
    str?.let {
        this?.append(it.superscriptSpan(0..it.length))
    }
    return this
}

/**
 *设置目标文字字体下标
 * @return
 */
fun TextView?.subscriptSpan(
    src: CharSequence? = this?.text,
    target: CharSequence? = this?.text,
    range: IntRange? = null
): TextView? {
    return when {
        this == null -> this
        src.isNullOrEmpty() -> this
        target.isNullOrEmpty() && range == null -> this
        range != null -> {
            text = src.subscriptSpan(range)
            this
        }
        target.isNotNullOrEmpty() -> {
            text = src.subscriptSpan(src.range(target!!))
            this
        }
        else -> this
    }
}

fun TextView?.appendSubscriptSpan(str: String?): TextView? {
    str?.let {
        this?.append(it.subscriptSpan(0..it.length))
    }
    return this
}

/**
 *设置目标文字字体
 * @return
 */
fun TextView?.fontSpan(
    src: CharSequence? = this?.text,
    target: CharSequence? = this?.text,
    range: IntRange? = null,
    font: String
): TextView? {
    return when {
        this == null -> this
        src.isNullOrEmpty() -> this
        target.isNullOrEmpty() && range == null -> this
        range != null -> {
            text = src.fontSpan(range, font)
            this
        }
        target.isNotNullOrEmpty() -> {
            text = src.fontSpan(src.range(target!!), font)
            this
        }
        else -> this
    }
}

fun TextView?.appendFontSpan(str: String?, font: String): TextView? {
    str?.let {
        this?.append(it.fontSpan(0..it.length, font))
    }
    return this
}

/**
 *设置目标文字字体
 * @return
 */
@RequiresApi(Build.VERSION_CODES.P)
fun TextView?.fontSpan(
    src: CharSequence? = this?.text,
    target: CharSequence? = this?.text,
    range: IntRange? = null,
    font: Typeface
): TextView? {
    return when {
        this == null -> this
        src.isNullOrEmpty() -> this
        target.isNullOrEmpty() && range == null -> this
        range != null -> {
            text = src.fontSpan(range, font)
            this
        }
        target.isNotNullOrEmpty() -> {
            text = src.fontSpan(src.range(target!!), font)
            this
        }
        else -> this
    }
}

@RequiresApi(Build.VERSION_CODES.P)
fun TextView?.appendFontSpan(str: String?, font: Typeface): TextView? {
    str?.let {
        this?.append(it.fontSpan(0..it.length, font))
    }
    return this
}

/**
 *设置目标文字对齐方式
 * @return
 */
fun TextView?.alignSpan(
    src: CharSequence? = this?.text,
    target: CharSequence? = this?.text,
    range: IntRange? = null,
    align: Layout.Alignment
): TextView? {
    return when {
        this == null -> this
        src.isNullOrEmpty() -> this
        target.isNullOrEmpty() && range == null -> this
        range != null -> {
            text = src.alignSpan(range, align)
            this
        }
        target.isNotNullOrEmpty() -> {
            text = src.alignSpan(src.range(target!!), align)
            this
        }
        else -> this
    }
}

fun TextView?.appendAlignSpan(str: String?, align: Layout.Alignment): TextView? {
    str?.let {
        this?.append(it.alignSpan(0..it.length, align))
    }
    return this
}

/**
 *设置目标文字超链接
 * @return
 */
fun TextView?.urlSpan(
    src: CharSequence? = this?.text,
    target: CharSequence? = this?.text,
    range: IntRange? = null,
    url: String
): TextView? {
    return when {
        this == null -> this
        src.isNullOrEmpty() -> this
        target.isNullOrEmpty() && range == null -> this
        range != null -> {
            movementMethod = LinkMovementMethod.getInstance()
            text = src.urlSpan(range, url)
            this
        }
        target.isNotNullOrEmpty() -> {
            movementMethod = LinkMovementMethod.getInstance()
            text = src.urlSpan(src.range(target!!), url)
            this
        }
        else -> this
    }
}

fun TextView?.appendUrlSpan(str: String?, url: String): TextView? {
    str?.let {
        this?.append(it.urlSpan(0..it.length, url))
    }
    return this
}

/**
 *设置目标文字点击
 * @return
 */
fun TextView?.clickIntSpan(
    src: CharSequence? = this?.text,
    target: CharSequence? = this?.text,
    range: IntRange? = null,
    color: Int = Color.RED,
    isUnderlineText: Boolean = false,
    clickAction: () -> Unit
): TextView? {
    return when {
        this == null -> this
        src.isNullOrEmpty() -> this
        target.isNullOrEmpty() && range == null -> this
        range != null -> {
            movementMethod = LinkMovementMethod.getInstance()
            highlightColor = Color.TRANSPARENT  // remove click bg color
            text = src.clickSpan(range, color, isUnderlineText, clickAction)
            this
        }
        target.isNotNullOrEmpty() -> {
            movementMethod = LinkMovementMethod.getInstance()
            highlightColor = Color.TRANSPARENT  // remove click bg color
            text = src.clickSpan(src.range(target!!), color, isUnderlineText, clickAction)
            this
        }
        else -> this
    }
}

fun TextView?.appendClickIntSpan(
    str: String?, color: Int = Color.RED,
    isUnderlineText: Boolean = false,
    clickAction: () -> Unit
): TextView? {
    str?.let {
        this?.append(it.clickSpan(0..it.length, color, isUnderlineText, clickAction))
    }
    return this
}

/**
 *设置目标文字点击
 * @return
 */
fun TextView?.clickSpan(
    src: CharSequence? = this?.text,
    target: CharSequence? = this?.text,
    range: IntRange? = null,
    @ColorRes color: Int,
    isUnderlineText: Boolean = false,
    clickAction: () -> Unit
): TextView? {
    return when {
        this == null -> this
        src.isNullOrEmpty() -> this
        target.isNullOrEmpty() && range == null -> this
        range != null -> {
            movementMethod = LinkMovementMethod.getInstance()
            highlightColor = Color.TRANSPARENT  // remove click bg color
            text = src.clickSpan(range, ResUtils.getColor(color), isUnderlineText, clickAction)
            this
        }
        target.isNotNullOrEmpty() -> {
            movementMethod = LinkMovementMethod.getInstance()
            highlightColor = Color.TRANSPARENT  // remove click bg color
            text = src.clickSpan(
                src.range(target!!),
                ResUtils.getColor(color),
                isUnderlineText,
                clickAction
            )
            this
        }
        else -> this
    }
}

fun TextView?.appendClickSpan(
    str: String?,
    @ColorRes color: Int,
    isUnderlineText: Boolean = false,
    clickAction: () -> Unit
): TextView? {
    str?.let {
        this?.append(
            it.clickSpan(
                0..it.length,
                ResUtils.getColor(color),
                isUnderlineText,
                clickAction
            )
        )
    }
    return this
}

Copy the code

ResUtils is a simple way to get a resource file. If you want to import it directly, you can refer to Github and use gradle dependencies directly.

SpannableStringBuiler encapsulation Kotlin

preface

Simple Usage Example

Encapsulation using

In the first case, the content to be set is already a complete piece of content

In the second case, concatenate to a complete string

The complete code

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