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[java] view plaincopyprint?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 [java] view plaincopyprint?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
[java] view plaincopyprint?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
[java] view plaincopyprint?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[html] view plaincopyprint?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
[java] view plaincopyprint?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
[html] view plaincopyprint?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[html] view plaincopyprint?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[html] view plaincopyprint?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[html] view plaincopyprint?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）[html] view plaincopyprint?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）
[html] view plaincopyprint?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);
}