SpannableString? 修改指定字體顏色，用在協議方面， 給字體添加下劃線，刪除線，等功能 。

setSpan(Object what, int start, int end, int flags)方法需要用戶輸入四個參數，what表示設置的格式是什么，可以是前景色、背景色也可以是可點擊的文本等等，start表示需要設置格式的子字符串的起始下標，同理end表示終了下標，flags屬性就有意思了，共有四種屬性：

Spanned.SPAN_INCLUSIVE_EXCLUSIVE?從起始下標到終了下標，包括起始下標
Spanned.SPAN_INCLUSIVE_INCLUSIVE?從起始下標到終了下標，同時包括起始下標和終了下標
Spanned.SPAN_EXCLUSIVE_EXCLUSIVE?從起始下標到終了下標，但都不包括起始下標和終了下標
Spanned.SPAN_EXCLUSIVE_INCLUSIVE?從起始下標到終了下標，包括終了下標

SpannableString的setSpan()方法可以同時使用多個，實現多種效果疊加。

span常見的功能

• ForegroundColorSpan：前景色
• BackgroundColorSpan：背景色
• ClickableSpan：抽象類，可點擊效果，重寫onClick方法響應點擊事件
• URLSpan：超鏈接
• MaskFilterSpan：EmbossMaskFilter浮雕效果，BlurMaskFilter模糊效果
• RelativeSpan：文字相對大小
• AbsoluteSpan：文字絕對大小
• ScaleXSpan：x軸縮放
• styleSpan：文字樣式
• TypefaceSpan：文字字體類型
• TextApearanceSpan：文字外貌
• UnderlineSpan：下劃線
• StrikeThroughSpan：刪除線
• SuperscriptSpan：上標
• SubscriptSpan：下標
• ImageSpan：圖片

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實現 指定字體顏色之改變

        SpannableString spannableString = new SpannableString("僅售:26元");ForegroundColorSpan foregroundColorSpan = new ForegroundColorSpan(Color.parseColor("#FF0000"));spannableString.setSpan(foregroundColorSpan,3,5, Spanned.SPAN_INCLUSIVE_INCLUSIVE);textView.setText(spannableString);

效果圖

現在把價格文字變大

        SpannableString spannableString = new SpannableString("僅售:26元");ForegroundColorSpan foregroundColorSpan = new ForegroundColorSpan(Color.parseColor("#FF0000"));RelativeSizeSpan sizeSpan = new RelativeSizeSpan(3f);spannableString.setSpan(foregroundColorSpan,3,5, Spanned.SPAN_INCLUSIVE_INCLUSIVE);spannableString.setSpan(sizeSpan,3,5, Spanned.SPAN_INCLUSIVE_INCLUSIVE);textView.setText(spannableString);

效果圖

在給價格設置一個背景顏色

SpannableString spannableString = new SpannableString("僅售:26元");ForegroundColorSpan foregroundColorSpan = new ForegroundColorSpan(Color.parseColor("#FF0000"));RelativeSizeSpan sizeSpan = new RelativeSizeSpan(3f);BackgroundColorSpan colorSpan = new BackgroundColorSpan(Color.parseColor("#00d8a0"));spannableString.setSpan(foregroundColorSpan,3,5, Spanned.SPAN_INCLUSIVE_INCLUSIVE);spannableString.setSpan(sizeSpan,3,5, Spanned.SPAN_INCLUSIVE_INCLUSIVE);spannableString.setSpan(colorSpan,3,5, Spanned.SPAN_INCLUSIVE_INCLUSIVE);

效果圖

給價格添加一個下劃線

 SpannableString spannableString = new SpannableString("僅售:26元");ForegroundColorSpan foregroundColorSpan = new ForegroundColorSpan(Color.parseColor("#FF0000"));RelativeSizeSpan sizeSpan = new RelativeSizeSpan(3f);BackgroundColorSpan colorSpan = new BackgroundColorSpan(Color.parseColor("#00d8a0"));UnderlineSpan underlineSpan = new UnderlineSpan();spannableString.setSpan(foregroundColorSpan,3,5, Spanned.SPAN_INCLUSIVE_INCLUSIVE);spannableString.setSpan(sizeSpan,3,5, Spanned.SPAN_INCLUSIVE_INCLUSIVE);spannableString.setSpan(colorSpan,3,5, Spanned.SPAN_INCLUSIVE_INCLUSIVE);spannableString.setSpan(underlineSpan,3,5, Spanned.SPAN_INCLUSIVE_INCLUSIVE);

效果圖

給價格添加一個刪除線

        SpannableString spannableString = new SpannableString("僅售:26元");ForegroundColorSpan foregroundColorSpan = new ForegroundColorSpan(Color.parseColor("#FF0000"));RelativeSizeSpan sizeSpan = new RelativeSizeSpan(3f);BackgroundColorSpan colorSpan = new BackgroundColorSpan(Color.parseColor("#00d8a0"));UnderlineSpan underlineSpan = new UnderlineSpan();StrikethroughSpan strikethroughSpan = new StrikethroughSpan();spannableString.setSpan(foregroundColorSpan,3,5, Spanned.SPAN_INCLUSIVE_INCLUSIVE);spannableString.setSpan(sizeSpan,3,5, Spanned.SPAN_INCLUSIVE_INCLUSIVE);spannableString.setSpan(colorSpan,3,5, Spanned.SPAN_INCLUSIVE_INCLUSIVE);spannableString.setSpan(underlineSpan,3,5, Spanned.SPAN_INCLUSIVE_INCLUSIVE);spannableString.setSpan(strikethroughSpan,3,5, Spanned.SPAN_INCLUSIVE_INCLUSIVE);

效果圖

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給價格設置一個點擊事件?

 SpannableString spannableString = new SpannableString("僅售:26元");ForegroundColorSpan foregroundColorSpan = new ForegroundColorSpan(Color.parseColor("#FF0000"));RelativeSizeSpan sizeSpan = new RelativeSizeSpan(3f);BackgroundColorSpan colorSpan = new BackgroundColorSpan(Color.parseColor("#00d8a0"));UnderlineSpan underlineSpan = new UnderlineSpan();StrikethroughSpan strikethroughSpan = new StrikethroughSpan();ClickableSpan clickableSpan = new ClickableSpan() {@Overridepublic void onClick(View widget) {Toast.makeText(ThreeActivity.this, "點擊了價格", Toast.LENGTH_SHORT).show();}};spannableString.setSpan(foregroundColorSpan,3,5, Spanned.SPAN_INCLUSIVE_INCLUSIVE);spannableString.setSpan(sizeSpan,3,5, Spanned.SPAN_INCLUSIVE_INCLUSIVE);spannableString.setSpan(colorSpan,3,5, Spanned.SPAN_INCLUSIVE_INCLUSIVE);spannableString.setSpan(underlineSpan,3,5, Spanned.SPAN_INCLUSIVE_INCLUSIVE);spannableString.setSpan(strikethroughSpan,3,5, Spanned.SPAN_INCLUSIVE_INCLUSIVE);spannableString.setSpan(clickableSpan,3,5, Spanned.SPAN_INCLUSIVE_INCLUSIVE);textView.setMovementMethod(LinkMovementMethod.getInstance());textView.setText(spannableString);

需要注意的是設置點擊事件的時候 在textview.setText 之前需要使用

setMovementMethod()方法否則點擊無效果。。。。

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總結

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