本文轉載自：http://www.2cto.com/kf/201512/455755.html
49.Android 各種Span
Android 各種Span 前言 SpannableStringBuilder URLSpan UnderlineSpan TypefaceSpan TextAppearanceSpan TabStopSpanStandard SuperscriptSpan SubscriptSpan StrikethroughSpan ScaleXSpan StyleSpan RelativeSizeSpan QuoteSpan MaskFilterSpan LeadingMarginSpanStandard ImageSpan IconMarginSpan ForegroundColorSpan DrawableMarginSpan BulletSpan BackgroundColorSpan AlignmentSpanStandard AbsoluteSizeSpan ClickableSpan 源代碼
前言
在android.text.style包下，有一些Span類，可以提供我們完成一些在TextView中的特殊內容。（比如：部分內容顏色、字體、大小不同等等，更有部分字體可點擊。）
還有一個SpannableStringBuilder，可以幫助我們設置Span。
底下也有全部的源代碼。
SpannableStringBuilder
SpannableStringBuilder可以方便我們更好的設置上對應的Span。
設置Span
SpannableStringBuilder.setSpan(Object what, int start, int end, int flags)
這裏的Flag表示：start和end是開區間還是閉區間。
Flag:
Spanned.SPAN_EXCLUSIVE_EXCLUSIVE —— (a,b)
Spanned.SPAN_EXCLUSIVE_INCLUSIVE —— (a,b]
Spanned.SPAN_INCLUSIVE_EXCLUSIVE —— [a,b)
Spanned.SPAN_INCLUSIVE_INCLUSIVE —— [a,b]
URLSpan
功能：點擊文字，可以打開一個URL。
URLSpan(String url)
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<code
class="language-java
hljs ">SpannableStringBuilder
ssb = new
SpannableStringBuilder(content);ssb.setSpan(new
URLSpan("https://github.com/CaMnter"),
start, sub.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);contentTV.setText(ssb);//
在單擊鏈接時凡是有要執行的動作，都必須設置MovementMethod對象contentTV.setMovementMethod(LinkMovementMethod.getInstance());//
設置點擊後的顏色，這裏涉及到ClickableSpan的點擊背景contentTV.setHighlightColor(0xff8FABCC);</code> |
UnderlineSpan
功能：設置文字下劃線。
UnderlineSpan()
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<code
class="language-java
hljs ">SpannableStringBuilder
ssb = new
SpannableStringBuilder(content);ssb.setSpan(new
UnderlineSpan(), start, start + sub.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);contentTV.setText(ssb);</code> |
UnderlineSpan
功能：設置文字下劃線。
UnderlineSpan()
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<code
class="language-java
hljs ">SpannableStringBuilder
ssb = new
SpannableStringBuilder(content);ssb.setSpan(new
UnderlineSpan(), start, start + sub.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);contentTV.setText(ssb);</code> |
TypefaceSpan
功能：設置文字字體。
TypefaceSpan(String family)構造方法源碼中的註釋提示了三種系統字體：
monospace
serif
sans-serif
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<code
class="language-java
hljs ">
/** *
@param family The font family for this typeface. Examples include *
"monospace", "serif", and "sans-serif". */ public
TypefaceSpan(String family) { mFamily
= family; }</code> |
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<code
class="language-java
hljs ">SpannableStringBuilder
ssb = new
SpannableStringBuilder(content);ssb.setSpan(new
TypefaceSpan("serif"),
start, start + sub.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);contentTV.setText(ssb);</code> |
TextAppearanceSpan
功能：設置文字字體、文字樣式（粗體、斜體、等等）、文字顏色狀態、文字下劃線顏色狀態等等。
TextAppearanceSpan的三個構造方法
TextAppearanceSpan(Context context, int appearance)
TextAppearanceSpan(Context context, int appearance, int colorList)
TextAppearanceSpan(String family, int style, int size,ColorStateList color, ColorStateList linkColor)
family:
monospace
serif
sans-serif
style:
Typeface.NORMAL
Typeface.BOLD
Typeface.ITALIC
Typeface.BOLD_ITALIC
size:表示字體大小（單位px）
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<code
class="language-java
hljs ">SpannableStringBuilder
ssb = new
SpannableStringBuilder(content);ColorStateList
colorStateList = null;if
(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { colorStateList
= this.activity.getColorStateList(R.color.selector_apperarance_span);}
else
{ try
{ colorStateList
= ColorStateList.createFromXml(this.activity.getResources(),
this.activity.getResources().getXml(R.color.selector_apperarance_span)); }
catch
(XmlPullParserException | IOException e) { e.printStackTrace(); }}ssb.setSpan(new
TextAppearanceSpan("serif",
Typeface.BOLD_ITALIC, this.activity.getResources().getDimensionPixelSize(R.dimen.text_appearance_span),
colorStateList, colorStateList), start, start + sub.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);contentTV.setText(ssb);</code> |
TabStopSpan.Standard
功能：每行的MarginLeft的偏移量（跟 \t 和 \n 有關係）。
TabStopSpan.Standard(int where)
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<code
class="language-java
hljs ">SpannableStringBuilder
ssb = new
SpannableStringBuilder(content);String[]
subs = content.split("
");ssb
= new
SpannableStringBuilder();/** *
TabStopSpan. Standard related to \t and \n *
TabStopSpan.Standard 跟 \t 和 \n 有關係 */for
(String sub1 : subs) { ssb.append("\t").append(sub1).append("
"); ssb.append("\n");}ssb.setSpan(new
TabStopSpan.Standard(126),
0,
ssb.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);contentTV.setText(ssb);</code> |
vcFNwYW4uU3RhbmRhcmQ=" src="http://www.2cto.com/uploadfile/Collfiles/20151230/20151230092053158.png" title="\"
/>
SuperscriptSpan
功能：文字設置爲上標，數學公式中用到。
SuperscriptSpan(Parcel src)
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<code
class="language-java
hljs ">SpannableStringBuilder
ssb = new
SpannableStringBuilder(content);ssb.replace(start,
start + sub.length(), "Save6");Parcel
parcel = Parcel.obtain();parcel.writeInt(6);int
sixPosition = ssb.toString().indexOf("6");ssb.setSpan(new
SuperscriptSpan(parcel), sixPosition, sixPosition + 1,
Spanned.SPAN_INCLUSIVE_INCLUSIVE);parcel.recycle();contentTV.setText(ssb);</code> |
SubscriptSpan
功能：文字設置爲下標，化學式中用到。
SubscriptSpan(Parcel src)
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<code
class="language-java
hljs ">SpannableStringBuilder
ssb = new
SpannableStringBuilder(content);ssb.replace(start,
start + sub.length(), "Save6");Parcel
parcel = Parcel.obtain();parcel.writeInt(6);int
sixPosition = ssb.toString().indexOf("6");ssb.setSpan(new
SubscriptSpan(parcel), sixPosition, sixPosition + 1,
Spanned.SPAN_INCLUSIVE_INCLUSIVE);parcel.recycle();contentTV.setText(ssb);</code> |
StrikethroughSpan
功能：文字設置刪除線。
StrikethroughSpan()
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<code
class="language-java
hljs ">SpannableStringBuilder
ssb = new
SpannableStringBuilder(content);ssb.setSpan(new
StrikethroughSpan(), start, start + sub.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);contentTV.setText(ssb);</code> |
ScaleXSpan
功能：文字橫向縮放。
ScaleXSpan(float proportion)
proportion：縮放比例
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<code
class="language-java
hljs ">SpannableStringBuilder
ssb = new
SpannableStringBuilder(content);ssb.setSpan(new
ScaleXSpan(2.0f),
start, start + sub.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);contentTV.setText(ssb);</code> |
StyleSpan
功能：文字設置樣式（正常、粗體、斜體、粗斜體）。
StyleSpan(int style)
style:
Typeface.NORMAL
Typeface.BOLD
Typeface.ITALIC
Typeface.BOLD_ITALIC
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<code
class="language-java
hljs ">SpannableStringBuilder
ssb = new
SpannableStringBuilder(content);ssb.setSpan(new
StyleSpan(Typeface.BOLD_ITALIC), start, start + sub.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);contentTV.setText(ssb);</code> |
RelativeSizeSpan
功能：設置文字相對大小，指相對於文本設定的大小的相對比例。
RelativeSizeSpan(float proportion)
proportion：大小比例。
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<code
class="language-java
hljs ">SpannableStringBuilder
ssb = new
SpannableStringBuilder(content);ssb.setSpan(new
RelativeSizeSpan(6.0f),
start, start + sub.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);contentTV.setText(ssb);</code> |
QuoteSpan![]()
功能：設置文字左側顯示引用樣式（一條豎線）。
QuoteSpan(@ColorInt int color)
color：豎線的顏色。
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<code
class="language-java
hljs ">SpannableStringBuilder
ssb = new
SpannableStringBuilder(content);ssb.setSpan(new
QuoteSpan(0xff000000),
start, start + sub.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);contentTV.setText(ssb);</code> |