欢迎使用CSDN-markdown编辑器

Android中Textview显示带html文本一——-【HTML标签】
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

^{_{复制代码
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
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 for each
// 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);    }}

复制代码
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
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));    }}

}
复制代码
调用页面：

复制代码
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;@Overridepublic 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());}

}
复制代码
下篇将会讲带图片的html文本显示！