[url=http://developer.android.com/reference/android/text/Spanned.html]这里[/url][/b]>。这里要重点说明下关于参数0,有很多时候，如果设置了上述的参数，那么Span会从start应用到Text结尾，而不是在start和end二者之间，这个时候就需要使用Flag 0。
[b]Linkify
[/b]另外，也可以对通过TextView.setAutoLink(int)设置其Linkify属性，其用处在于，TextView会自动检查其内容，会识别出phone number, web address or email address，并标识为超链接，可点击，点击后便跳转到相应的应用，如Dialer，Browser或Email。Linkify有几个常用选项，更多的请参考<[b][url=http://developer.android.com/reference/android/text/util/Linkify.html]文档[/url][/b]>
•Linkify.EMAIL_ADDRESS -- 仅识别出TextView中的Email在址，标识为超链接，点击后会跳到Email，发送邮件给此地址
•Linkify.PHONE_NUMBERS -- 仅识别出TextView中的电话号码，标识为超链接，点击后会跳到Dialer，Call这个号码
•Linkify.WEB_URLS-- 仅识别出TextView中的网址，标识为超链接，点击后会跳到Browser打开此URL
•Linkify.ALL -- 这个选项是识别出所有系统所支持的特殊Uri，然后做相应的操作
[b]权衡选择
[/b]个人认为软件开发中最常见的问题不是某个技巧怎么使用的问题，而是何时该使用何技巧的问题，因为实现同一个目标可能有N种不同的方法，就要权衡利弊，选择最合适的一个，正如常言所云，没有最好的，只有最适合的。如前面所讨论的，要想用不同的字体展现不同的信息可能的解法，除了用Style Span外还可以用多个TextView。那么就需要总结下什么时候该使用StyleSpan，什么时候该使用多个TextView：
1.如果显示的是多个不同类别的信息，就应该使用多个TextView，这样也方便控制和改变各自的信息，例子就是默认LockScreen上面的日期和充电信息，因为它们所承载不同的信息，所以应该使用多个TextView来分别呈现。
2.如果显示的是同一类信息，或者同一个信息，那么应该使用StyleSpan。比如，短信息中，要把联系人的相关信息突出显示；或是想要Highlight某些信息等。
3.如果要实现Rich text，没办法，只能使用Style span。
4.如果要实现某些特效，也可以考虑使用StyleSpan。设置不同的字体风格只是Style span的初级应用，如果深入研究，可以发现很多奇妙的功效。
实例
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<ScrollView
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/text_view_font_1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/text_view_font_2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/text_view_font_3"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/text_view_font_4"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/text_view_font_5"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
</ScrollView>
</LinearLayout>
Source code:
package com.android.effective;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import android.app.Activity;
import android.graphics.Color;
import android.graphics.Typeface;
import android.os.Bundle;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.SpannableStringBuilder;
import android.text.style.AbsoluteSizeSpan;
import android.text.style.BackgroundColorSpan;
import android.text.style.ForegroundColorSpan;
import android.text.style.QuoteSpan;
import android.text.style.RelativeSizeSpan;
import android.text.style.ScaleXSpan;
import android.text.style.StrikethroughSpan;
import android.text.style.StyleSpan;
import android.text.style.TypefaceSpan;
import android.text.style.URLSpan;
import android.text.util.Linkify;
import android.widget.TextView;
public class TextViewFontActivity extends Activity {
@Override
public void onCreate(Bundle bundle) {
super.onCreate(bundle);
setContentView(R.layout.textview_font_1);
// Demonstration of basic SpannableString and spans usage
final TextView textWithString = (TextView) findViewById(R.id.text_view_font_1);
String w = "The quick fox jumps over the lazy dog";
int start = w.indexOf('q');
int end = w.indexOf('k') + 1;
Spannable word = new SpannableString(w);
word.setSpan(new AbsoluteSizeSpan(22), start, end,
Spannable.SPAN_INCLUSIVE_INCLUSIVE);
word.setSpan(new StyleSpan(Typeface.BOLD), start, end,
Spannable.SPAN_INCLUSIVE_INCLUSIVE);
word.setSpan(new BackgroundColorSpan(Color.RED), start, end,
Spannable.SPAN_INCLUSIVE_INCLUSIVE);
textWithString.setText(word);
// Demonstration of basic SpannableStringBuilder and spans usage
final TextView textWithBuilder = (TextView) findViewById(R.id.text_view_font_2);
SpannableStringBuilder word2 = new SpannableStringBuilder();
final String one = "Freedom is nothing but a chance to be better!";
final String two = "The quick fox jumps over the lazy dog!";
final String three = "The tree of liberty must be refreshed from time to time with " +
"the blood of patroits and tyrants!";
word2.append(one);
start = 0;
end = one.length();
word2.setSpan(new StyleSpan(Typeface.BOLD_ITALIC), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
word2.append(two);
start = end;
end += two.length();
word2.setSpan(new ForegroundColorSpan(Color.CYAN), start, end,
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
word2.append(three);
start = end;
end += three.length();
word2.setSpan(new URLSpan(three), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
textWithBuilder.setText(word2);
// Troubleshooting when using SpannableStringBuilder
final TextView textTroubles = (TextView) findViewById(R.id.text_view_font_3);
SpannableStringBuilder word3 = new SpannableStringBuilder();
start = 0;
end = one.length();
// Caution: must first append or set text to SpannableStringBuilder or SpannableString
// then set the spans to them, otherwise, IndexOutOfBoundException is thrown when setting spans
word3.append(one);
// For AbsoluteSizeSpan, the flag must be set to 0, otherwise, it will apply this span to until end of text
word3.setSpan(new AbsoluteSizeSpan(22), start, end, 0);//Spannable.SPAN_INCLUSIVE_INCLUSIVE);
// For BackgroundColorSpanSpan, the flag must be set to 0, otherwise, it will apply this span to end of text
word3.setSpan(new BackgroundColorSpan(Color.DKGRAY), start, end, 0); //Spannable.SPAN_INCLUSIVE_INCLUSIVE);
word3.append(two);
start = end;
end += two.length();
word3.setSpan(new TypefaceSpan("sans-serif"), start, end,
Spannable.SPAN_INCLUSIVE_INCLUSIVE);
// TODO: sometimes, flag must be set to 0, otherwise it will apply the span to until end of text
// which MIGHT has nothing to do with specific span type.
word3.setSpan(new StyleSpan(Typeface.BOLD_ITALIC), start, end, 0);//Spannable.SPAN_INCLUSIVE_INCLUSIVE);
word3.setSpan(new ScaleXSpan(0.618f), start, end, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
word3.setSpan(new StrikethroughSpan(), start, end, 0);//Spannable.SPAN_INCLUSIVE_INCLUSIVE);
word3.setSpan(new ForegroundColorSpan(Color.CYAN), start, end, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
word3.setSpan(new QuoteSpan(), start, end, 0); //Spannable.SPAN_INCLUSIVE_INCLUSIVE);
word3.append(three);
start = end;
end += three.length();
word3.setSpan(new RelativeSizeSpan((float) Math.E), start, end, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
word3.setSpan(new ForegroundColorSpan(Color.BLUE), start, end, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
textTroubles.setText(word3);
// Highlight some patterns
final String four = "The gap between the best software engineering " +
"practice and the average practice is very wide¡ªperhaps wider " +
" than in any other engineering discipline. A tool that disseminates " +
"good practice would be important.¡ªFred Brooks";
final Pattern highlight = Pattern.compile("the");
final TextView textHighlight = (TextView) findViewById(R.id.text_view_font_4);
SpannableString word4 = new SpannableString(four);
Matcher m = highlight.matcher(word4.toString());
while (m.find()) {
word4.setSpan(new StyleSpan(Typeface.BOLD_ITALIC), m.start(), m.end(),
Spannable.SPAN_INCLUSIVE_INCLUSIVE);
word4.setSpan(new ForegroundColorSpan(Color.RED), m.start(), m.end(),
Spannable.SPAN_INCLUSIVE_INCLUSIVE);
word4.setSpan(new StrikethroughSpan(), m.start(), m.end(),
Spannable.SPAN_INCLUSIVE_INCLUSIVE);
}
textHighlight.setText(word4);
// Set numbers, URLs and E-mail address to be clickable with TextView#setAutoLinkMask
final TextView textClickable = (TextView) findViewById(R.id.text_view_font_5);
final String contact = "Email: mvp@microsoft.com\n" +
"Phone: +47-24885883\n" +
"Fax: +47-24885883\n" +
"HTTP: www.microsoft.com/mvp.asp";
// Set the attribute first, then set the text. Otherwise, it won't work
textClickable.setAutoLinkMask(Linkify.ALL); // or set 'android:autoLink' in layout xml
textClickable.setText(contact);
}
}
The results:
[img]http://files.jb51.net/file_images/article/201305/201305231012114.gif[/img]
[img]http://files.jb51.net/file_images/article/201305/201305231012115.gif[/img]
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