Android中SpannableStringBuilder用法小结

Android中SpannableStringBuilder的用途很多，其中简单的使用方法如下：总结的不好，请指正：

SpannableStringBuilder是Android中对字符操作的stringBuilder，给字符串增加一系列的操作：主要是给指定长度的内容设置例如设置字体（加粗，斜体，加粗斜体），设置下划线，设置文字的颜色，设置背景色，设置图片等。具体示例代码如下：

TextView textView = (TextView) findViewById(R.id.textView);
String string = "tel:18919087536 ";
SpannableStringBuilder spannableStringBuilder = new SpannableStringBuilder(string);
BackgroundColorSpan backgroundColorSpan = new BackgroundColorSpan(Color.RED);//背景色
spannableStringBuilder.setSpan(backgroundColorSpan, 0, 10, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

URLSpan urlSpan = new URLSpan("tel:18919087536");//url样式

//跳转只需要实现  urlSpan.onClick(textView);即可实现跳转，当然要增加相应的权限

spannableStringBuilder.setSpan(urlSpan, 0, string.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

ForegroundColorSpan foregroundColorSpan = new ForegroundColorSpan(Color.BLUE);//前景色
spannableStringBuilder.setSpan(foregroundColorSpan, 10, string.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

ImageSpan imageSpan = new ImageSpan(this, BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher));//图片
spannableStringBuilder.setSpan(imageSpan,0,5,Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

Drawable drawable = getResources().getDrawable(R.mipmap.ic_launcher, null);
DrawableMarginSpan drawableMarginSpan = new DrawableMarginSpan(drawable);//drawable，不占用字符串的位置设置在开头有效
spannableStringBuilder.setSpan(drawableMarginSpan, string.length() - 1, string.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

StyleSpan styleSpan = new StyleSpan(Typeface.ITALIC);//字体样式Typeface.BOLD加粗,Typeface.BOLD_ITALIC加粗斜体，ITALIC斜体
spannableStringBuilder.setSpan(styleSpan, 0, string.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

StrikethroughSpan strikethroughSpan = new StrikethroughSpan();//删除线
spannableStringBuilder.setSpan(strikethroughSpan, 0, string.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

UnderlineSpan underlineSpan = new UnderlineSpan();//下划线
spannableStringBuilder.setSpan(underlineSpan, 0, string.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
textView.setText(spannableStringBuilder);