Android -- SpannableString

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

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);    
}   

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);    
} 

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);      
} 

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);  
}  

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);    
}   

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);    
}  

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());  

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);    
}

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);    
} 

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);  
}  

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);  
}