android中TextView的SpannableString小结

我们使用QQ，微信的时候，会发现：其文本样式多种多样，可以在TextView中显示表情，图片，超链接等等。今天就来大致总结一下相关的样式。

先看代码：

 /**
          * 设置前景色
          * @param tv
          */
         private void setForegroundColorSpan(TextView tv) {
             SpannableString spanString = new SpannableString("前景色textview");
             ForegroundColorSpan span = new ForegroundColorSpan(Color.BLUE);
             spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
             tv.append(spanString);
         }

         /**
          * 设置背景色
          * @param tv
          */
         private void setBackgroundColorSpan(TextView  tv) {
             SpannableString spanString = new SpannableString("背景色textview");
             BackgroundColorSpan span = new BackgroundColorSpan(Color.YELLOW);
             spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
             tv.append(spanString);
         }
         /**
          * 设置粗体样式
          * @param tv
          */
         private void setStyleSpan(TextView tv) {
             SpannableString spanString = new SpannableString("粗体斜体textview");
             StyleSpan span = new StyleSpan(Typeface.BOLD_ITALIC);
             spanString.setSpan(span, 0, 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
             tv.append(spanString);
         }
         /**
          * 设置字体大小
          * @param tv
          */
         private void setRelativeFontSpan(TextView tv) {
             SpannableString spanString = new SpannableString("字体相对大小textview");
             spanString.setSpan(new RelativeSizeSpan(2.5f), 0, 6,Spannable.SPAN_INCLUSIVE_EXCLUSIVE);
             tv.append(spanString);
         }
         /**
          * 设置文本字体
          * @param tv
          */
         private void setTypefaceSpan(TextView tv) {
             SpannableString spanString = new SpannableString("文本字体textview");
             spanString.setSpan(new TypefaceSpan("monospace"), 0, 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
             tv.append(spanString);
         }
         /**
          * 添加URL超链接
          * @param tv
          */
         private void addUrlSpan(TextView tv) {
             SpannableString spanString = new SpannableString("csdntextview");
             URLSpan span = new URLSpan("http://blog.csdn.net/nuptboyzhb");
             spanString.setSpan(span, 0, 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
             tv.append(spanString);
             tv.setMovementMethod(LinkMovementMethod.getInstance());
         }
         /**
          * 在文字中显示图片表情等
          * @param tv
          */
         private void addImageSpan(TextView tv) {
             SpannableString spanString = new SpannableString("文中有图片表情等textview");
             Drawable d = getResources().getDrawable(R.drawable.ic_launcher);
             d.setBounds(0, 0, d.getIntrinsicWidth(), d.getIntrinsicHeight());
             ImageSpan span = new ImageSpan(d, ImageSpan.ALIGN_BASELINE);
             spanString.setSpan(span, 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
             tv.append(spanString);
         }
         /**
          * 点击后跳转Activity
          * @param textView
          * @param packageContext
          * @param cls
          */
         private void clickableSpan(TextView textView,final Context packageContext,final Class<?> cls){
             String text = "显示Activity";
             SpannableString spannableString = new SpannableString(text);
             spannableString.setSpan(new ClickableSpan() {
                 @Override
                 public void onClick(View widget) {
                     Intent intent = new Intent(packageContext,cls);
                     startActivity(intent);
                 }
                 // 表示点击整个text的长度都有效触发这个事件
             }, 0, text.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
             textView.setText(spannableString);
             textView.setMovementMethod(LinkMovementMethod.getInstance());
         }
         /**
          * 添加下划线
          * @param tv
          */
         private void addUnderLineSpan(TextView tv) {
             SpannableString spanString = new SpannableString("下划线textview");
             UnderlineSpan span = new UnderlineSpan();
             spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
             tv.append(spanString);
         }
         /**
          * 添加删除线样式
          * @param tv
          */
         private void addStrikeSpan(TextView tv) {
             SpannableString spanString = new SpannableString("删除线textview");
             StrikethroughSpan span = new StrikethroughSpan();
             spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
             tv.append(spanString);
         }

效果截图：

更多样式，参见官方文档。

http://developer.android.com/reference/android/text/style/package-summary.html