Android EditText/TextView使用SpannableString显示复合文本

         在Android中EditText用于编辑文本，TextView用于显示文本，但是有时候我们需要对其中的文本进行样式等方面的设置。Android为我们提供了SpannableString类来对指定文本进行处理。

1) ForegroundColorSpan        文本颜色

private void setForegroundColorSpan() {  
    SpannableString spanString = new SpannableString("前景色");  
    ForegroundColorSpan span = new ForegroundColorSpan(Color.BLUE);  
    spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);  
    tv.append(spanString);  
}  

2) BackgroundColorSpan 文本背景色 

private void setBackgroundColorSpan() {  
    SpannableString spanString = new SpannableString("背景色");  
    BackgroundColorSpan span = new BackgroundColorSpan(Color.YELLOW);  
    spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);  
    tv.append(spanString);  
} 

3) StyleSpan         字体样式：粗体、斜体等

private void setStyleSpan() {  
    SpannableString spanString = new SpannableString("粗体斜体");  
    StyleSpan span = new StyleSpan(Typeface.BOLD_ITALIC);  
    spanString.setSpan(span, 0, 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);  
    tv.append(spanString);  
}  

4) RelativeSizeSpan         相对大小

private void setRelativeFontSpan() {
	SpannableString spanString = new SpannableString("字体相对大小");
	spanString.setSpan(new RelativeSizeSpan(2.5f), 0, 6,Spannable.SPAN_INCLUSIVE_EXCLUSIVE);
	tv.append(spanString);    
}

5) TypefaceSpan         文本字体

private void setTypefaceSpan() {
	SpannableString spanString = new SpannableString("文本字体");
	spanString.setSpan(new TypefaceSpan("monospace"), 0, 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
	tv.append(spanText);
}

6) URLSpan 文本超链接

private void addUrlSpan() {  
    SpannableString spanString = new SpannableString("超链接");  
    URLSpan span = new URLSpan("http://www.baidu.com");  
    spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);  
    tv.append(spanString);  
}  

7) ImageSpan         图片

private void addImageSpan() {  
    SpannableString spanString = new SpannableString(" ");  
    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);  
} 

8) ClickableSpan                 文本有点击事件

private TextView textView;
textView = (TextView)this.findViewById(R.id.textView);
String text = "显示Activity";
SpannableString spannableString = new SpannableString(text);
spannableString.setSpan(new ClickableSpan() {
	@Override
	public void onClick(View widget) {
		Intent intent = new Intent(Main.this,OtherActivity.class);
		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());

9) UnderlineSpan         下划线

private void addUnderLineSpan() {  
    SpannableString spanString = new SpannableString("下划线");  
    UnderlineSpan span = new UnderlineSpan();  
    spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);  
    tv.append(spanString);  
} 

10) StrikethroughSpan         删除线

private void addStrikeSpan() {  
    SpannableString spanString = new SpannableString("删除线");  
    StrikethroughSpan span = new StrikethroughSpan();  
    spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);  
    tv.append(spanString);  
}  

11) SuggestionSpan 相当于占位符

12) MaskFilterSpan 修饰效果，如模糊(BlurMaskFilter)、浮雕(EmbossMaskFilter)

13) RasterizerSpan         光栅效果

14) AbsoluteSizeSpan         绝对大小（文本字体）

private void setAbsoluteFontSpan() {
		SpannableString spannableString = new SpannableString("40号字体");
		AbsoluteSizeSpan absoluteSizeSpan = new AbsoluteSizeSpan(40);
		spannableString.setSpan(absoluteSizeSpan, 0, 5, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
		editText.append(spannableString);
}

15) DynamicDrawableSpan    设置图片，基于文本基线或底部对齐。

16) TextAppearanceSpan 文本外貌（包括字体、大小、样式和颜色）

private void setTextAppearanceSpan() {
	SpannableString spanString = new SpannableString("文本外貌");
	TextAppearanceSpan textAppearanceSpan = new TextAppearanceSpan(this, android.R.style.TextAppearance_Medium)；
	spanString.setSpan(textAppearanceSpan, 0, 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
	tv.append(spanString);
}