现在网络的繁盛时代，光文字是不能满足人们的胃口的，图片，flash，音频，视频就成为浏览网页的主流显示，在手机上也一样。在手机上显示从网络端获取的数据显示，大家很自然的想起两种方式，一种就是webview，一种就是TextView。当然webView直接显示html页面就行了，我主要说的TextView显示html内容。
首先，说下TextView到底支持那些标签呢，通过对源码的查看，发现Textview可以解析一部分html标签，如： 复制代码代码如下:
<a href="..."> <b> <big> <blockquote> <br> <cite> <dfn> <div align="..."> <em> <font size="..." color="..." face="..."> <h1> <h2> <h3> <h4> <h5> <h6> <i> <img src="..."> <p> <small> <strike> <strong> <sub> <sup> <tt> <u>
大家想究其根本可以查看android.text.Html源码，其中有一段这样写：
复制代码代码如下:
private void handleStartTag(String tag, Attributes attributes) { if (tag.equalsIgnoreCase("br")) { // We don't need to handle this. TagSoup will ensure that there's a </br> for each <br> // so we can safely emite the linebreaks when we handle the close tag. } else if (tag.equalsIgnoreCase("p")) { handleP(mSpannableStringBuilder); } else if (tag.equalsIgnoreCase("div")) { handleP(mSpannableStringBuilder); } else if (tag.equalsIgnoreCase("em")) { start(mSpannableStringBuilder, new Bold()); } else if (tag.equalsIgnoreCase("b")) { start(mSpannableStringBuilder, new Bold()); } else if (tag.equalsIgnoreCase("strong")) { start(mSpannableStringBuilder, new Italic()); } else if (tag.equalsIgnoreCase("cite")) { start(mSpannableStringBuilder, new Italic()); } else if (tag.equalsIgnoreCase("dfn")) { start(mSpannableStringBuilder, new Italic()); } else if (tag.equalsIgnoreCase("i")) { start(mSpannableStringBuilder, new Italic()); } else if (tag.equalsIgnoreCase("big")) { start(mSpannableStringBuilder, new Big()); } else if (tag.equalsIgnoreCase("small")) { start(mSpannableStringBuilder, new Small()); } else if (tag.equalsIgnoreCase("font")) { startFont(mSpannableStringBuilder, attributes); } else if (tag.equalsIgnoreCase("blockquote")) { handleP(mSpannableStringBuilder); start(mSpannableStringBuilder, new Blockquote()); } else if (tag.equalsIgnoreCase("tt")) { start(mSpannableStringBuilder, new Monospace()); } else if (tag.equalsIgnoreCase("a")) { startA(mSpannableStringBuilder, attributes); } else if (tag.equalsIgnoreCase("u")) { start(mSpannableStringBuilder, new Underline()); } else if (tag.equalsIgnoreCase("sup")) { start(mSpannableStringBuilder, new Super()); } else if (tag.equalsIgnoreCase("sub")) { start(mSpannableStringBuilder, new Sub()); } else if (tag.length() == 2 && Character.toLowerCase(tag.charAt(0)) == 'h' && tag.charAt(1) >= '1' && tag.charAt(1) <= '6') { handleP(mSpannableStringBuilder); start(mSpannableStringBuilder, new Header(tag.charAt(1) - '1')); } else if (tag.equalsIgnoreCase("img")) { startImg(mSpannableStringBuilder, attributes, mImageGetter); } else if (mTagHandler != null) { mTagHandler.handleTag(true, tag, mSpannableStringBuilder, mReader); } } private void handleEndTag(String tag) { if (tag.equalsIgnoreCase("br")) { handleBr(mSpannableStringBuilder); } else if (tag.equalsIgnoreCase("p")) { handleP(mSpannableStringBuilder); } else if (tag.equalsIgnoreCase("div")) { handleP(mSpannableStringBuilder); } else if (tag.equalsIgnoreCase("em")) { end(mSpannableStringBuilder, Bold.class, new StyleSpan(Typeface.BOLD)); } else if (tag.equalsIgnoreCase("b")) { end(mSpannableStringBuilder, Bold.class, new StyleSpan(Typeface.BOLD)); } else if (tag.equalsIgnoreCase("strong")) { end(mSpannableStringBuilder, Italic.class, new StyleSpan(Typeface.ITALIC)); } else if (tag.equalsIgnoreCase("cite")) { end(mSpannableStringBuilder, Italic.class, new StyleSpan(Typeface.ITALIC)); } else if (tag.equalsIgnoreCase("dfn")) { end(mSpannableStringBuilder, Italic.class, new StyleSpan(Typeface.ITALIC)); } else if (tag.equalsIgnoreCase("i")) { end(mSpannableStringBuilder, Italic.class, new StyleSpan(Typeface.ITALIC)); } else if (tag.equalsIgnoreCase("big")) { end(mSpannableStringBuilder, Big.class, new RelativeSizeSpan(1.25f)); } else if (tag.equalsIgnoreCase("small")) { end(mSpannableStringBuilder, Small.class, new RelativeSizeSpan(0.8f)); } else if (tag.equalsIgnoreCase("font")) { endFont(mSpannableStringBuilder); } else if (tag.equalsIgnoreCase("blockquote")) { handleP(mSpannableStringBuilder); end(mSpannableStringBuilder, Blockquote.class, new QuoteSpan()); } else if (tag.equalsIgnoreCase("tt")) { end(mSpannableStringBuilder, Monospace.class, new TypefaceSpan("monospace")); } else if (tag.equalsIgnoreCase("a")) { endA(mSpannableStringBuilder); } else if (tag.equalsIgnoreCase("u")) { end(mSpannableStringBuilder, Underline.class, new UnderlineSpan()); } else if (tag.equalsIgnoreCase("sup")) { end(mSpannableStringBuilder, Super.class, new SuperscriptSpan()); } else if (tag.equalsIgnoreCase("sub")) { end(mSpannableStringBuilder, Sub.class, new SubscriptSpan()); } else if (tag.length() == 2 && Character.toLowerCase(tag.charAt(0)) == 'h' && tag.charAt(1) >= '1' && tag.charAt(1) <= '6') { handleP(mSpannableStringBuilder); endHeader(mSpannableStringBuilder); } else if (mTagHandler != null) { mTagHandler.handleTag(false, tag, mSpannableStringBuilder, mReader); } }
通过源码可以看到，除了默认的一些标签，其还支持自定义标签；看下面代码： else if (mTagHandler != null) { mTagHandler.handleTag(false, tag, mSpannableStringBuilder, mReader); } 系统会调用mTagHandler的handleTag方法。所以，我们可以实现此接口，来解析自己定义的标签类型。 具体的，自己可以看一下下面实例:
复制代码代码如下:
package com.mxgsa.tvimg; import org.xml.sax.XMLReader; import android.content.Context; import android.content.Intent; import android.text.Editable; import android.text.Html.TagHandler; import android.text.Spanned; import android.text.style.ClickableSpan; import android.view.View; import android.view.View.OnClickListener; public class MxgsaTagHandler implements TagHandler{ private int sIndex = 0; private int eIndex=0; private final Context mContext; public MxgsaTagHandler(Context context){ mContext=context; } public void handleTag(boolean opening, String tag, Editable output, XMLReader xmlReader) { // TODO Auto-generated method stub if (tag.toLowerCase().equals("mxgsa")) { if (opening) { sIndex=output.length(); }else { eIndex=output.length(); output.setSpan(new MxgsaSpan(), sIndex, eIndex, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); } } } private class MxgsaSpan extends ClickableSpan implements OnClickListener{ @Override public void onClick(View widget) { // TODO Auto-generated method stub //具体代码，可以是跳转页面，可以是弹出对话框，下面是跳转页面 mContext.startActivity(new Intent(mContext,MainActivity.class)); } } }
调用页面：
复制代码代码如下:
package com.mxgsa.tvimg; import android.app.Activity; import android.os.Bundle; import android.text.Html; import android.text.method.LinkMovementMethod; import android.widget.TextView; public class MxgsaActivity extends Activity{ private TextView tView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.mxgsa_activity); findControl(); setData(); } private void findControl() { tView = (TextView) findViewById(R.id.tvImage); } private void setData() { // TODO Auto-generated method stub final String sText = "测试自定义标签：<br><h1><mxgsa>测试自定义标签</mxgsa></h1>"; tView.setText(Html.fromHtml(sText, null, new MxgsaTagHandler(this))); tView.setClickable(true); tView.setMovementMethod(LinkMovementMethod.getInstance()); } }