Android学习之Span的使用方法详解

span.append(SpannableString("BulletSpan").also {
    it.setSpan(BulletSpan(40, Color.RED), 0, 10, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
})

span.append(SpannableString("\nQuoteSpan").also {
    it.setSpan(QuoteSpan(Color.BLUE), 0, 9, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
})

span.append(SpannableString("\nAlignmentSpan ALIGN_CENTER").also {
    it.setSpan(
        AlignmentSpan.Standard(Layout.Alignment.ALIGN_CENTER),
        0,
        "AlignmentSpan ALIGN_CENTER".length,
        Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
    )
})

span.append(SpannableString("\nUnderlineSpan").also {
    it.setSpan(
        UnderlineSpan(),
        0,
        "UnderlineSpan".length,
        Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
    )
})

span.append(SpannableString("\nStrikethroughSpan").also {
    it.setSpan(
        StrikethroughSpan(),
        0,
        "StrikethroughSpan".length,
        Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
    )
})

span.append(SpannableString("\n123SubscriptSpan456").also {
    it.setSpan(
        SubscriptSpan(),
        3,
        "SubscriptSpan".length,
        Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
    )
})

span.append(SpannableString("\n123SuperscriptSpan456").also {
    it.setSpan(
        SuperscriptSpan(),
        3,
        "SuperscriptSpan".length,
        Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
    )
})

span.append(SpannableString("\nTextAppearanceSpan").also {
    it.setSpan(
        TextAppearanceSpan(this@FuncSpannableAc,R.style.specialTextAppearance),
        0,
        "TextAppearanceSpan".length,
        Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
    )
})

<style name="specialTextAppearance" parent="@Android:style/TextAppearance">
    <item name="android:textColor">@android:color/holo_red_dark</item>
    <item name="android:textColorHighlight">@android:color/holo_blue_bright</item>
    <item name="android:textColorHint">@color/purple_700</item>
    <item name="android:textColorLink">@color/purple_200</item>
    <item name="android:textSize">20sp</item>
    <item name="android:textStyle">italic</item>
</style>

span.setSpan(BackgroundColorSpan(Color.BLUE), 0, 9, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)

span.setSpan(ForegroundColorSpan(Color.RED), 0, 9, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)

span.setSpan(TextClickableSpan(), 10, 19, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
class TextClickableSpan : ClickableSpan() {
    override fun onClick(widget: View) {
        Toast.makeText(widget.context, "TextClickSpan", Toast.LENGTH_SHORT).show()
    }
}

span.setSpan(
    URLSpan("https://www.baidu.com"),
    20,
    23,
    Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
)
// 尝试超链接是否可以修改颜色（结果是可以说明和上述BackgroundColorSpan和ForegroundColorSpan一样）
span.setSpan(ForegroundColorSpan(Color.RED), 20, 23, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)

span.setSpan(StyleSpan(Typeface.BOLD), 38, 47, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)

span.setSpan(
    ImageSpan(this, R.mipmap.ic_launcher, DynamicDrawableSpan.ALIGN_BASELINE),
    47, 48, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
)

var spannableString = SpannableString("ColorSpan ClickSpan URL UnderlineSpan StyleSpan ")

spannableString.also { span ->
    span.setSpan(BackgroundColorSpan(Color.BLUE), 0, 9, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
    span.setSpan(ForegroundColorSpan(Color.RED), 0, 9, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
    ......
}

var spannableString2 = SpannableStringBuilder("")
spannableString2.also { span ->
    span.append(SpannableString("BulletSpan").also {
        it.setSpan(BulletSpan(40, Color.RED), 0, 10, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
    })
    span.append(SpannableString("\nQuoteSpan").also {
        it.setSpan(QuoteSpan(Color.BLUE), 0, 9, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
    })
}

var spannableString3 = SpannableStringBuilder("")
spannableString3.also { span ->
    span.append(SpannableString("人均费用：").also {
        it.setSpan(StyleSpan(Typeface.BOLD), 0, "人均费用".length + 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
    })
    span.append(SpannableString("99元/人"))
}