TextView使用HTML标签_html/css_WEB-ITnose

要实现图片的显示需要使用Html.fromHtml的另外第二个重构方法：

public static Spanned fromHtml (String source, Html.ImageGetterimageGetter, Html.TagHandler tagHandler)

其中Html.ImageGetter是一个接口，我们要实现此接口，在它的getDrawable(String source)方法中返回图片的Drawable对象才可以。

ImageGetter imgGetter = new Html.ImageGetter() {        public Drawable getDrawable(String source) {              Drawable drawable = null;              URL url;                try {                     url = new URL(source);                    drawable = Drawable.createFromStream(url.openStream(), "");  //获取网路图片              } catch (Exception e) {                    return null;                }                drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable                            .getIntrinsicHeight());              return drawable;         }};

这里主要是实现了Html.ImageGetter接口，通过图片的URL地址获取相应的Drawable实例。

上面介绍的是显示网络上的图片，但如何显示本地的图片呢：

   ImageGetter imgGetter = new Html.ImageGetter() {        public Drawable getDrawable(String source) {              Drawable drawable = null;                             drawable = Drawable.createFromPath(source); //显示本地图片              drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable                            .getIntrinsicHeight());              return drawable;         }};

只需将source改为本地图片的路径便可，在这里我使用的是：

String source;
source=getFilesDir()+"/ic_launcher.png";

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这里主要讲一种场合的使用,来源

http://www.gxlcms.com/article/36643.htm

然而，有一种场合，默认支持的标签可能不够用。比如，我们需要在textView中点击某种链接，返回到应用中的某个界面，而不仅仅是网络连接，如何实现？

Html类中有一个接口类处理点击标签的处理的:

/**     * Is notified when HTML tags are encountered that the parser does     * not know how to interpret.     */     public static interface TagHandler {         /**         * This method will be called whenn the HTML parser encounters         * a tag that it does not know how to interpret.         */         public void handleTag(boolean opening, String tag,                                  Editable output, XMLReader xmlReader);

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.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.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);          }      }

如果不是默认的标签，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。

自定义一个标签,实现接口

public class GameTagHandler implements TagHandler {      private int startIndex = 0;      private int stopIndex = 0;      @Override      public void handleTag(boolean opening, String tag, Editable output,              XMLReader xmlReader) {          if (tag.toLowerCase().equals("game")) {              if (opening) {                  startGame(tag, output, xmlReader);              } else {                  endGame(tag, output, xmlReader);              }          }       }      public void startGame(String tag, Editable output, XMLReader xmlReader) {          startIndex = output.length();      }      public void endGame(String tag, Editable output, XMLReader xmlReader) {          stopIndex = output.length();          output.setSpan(new GameSpan(), startIndex, stopIndex,                      Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);      }      private class GameSpan extends ClickableSpan implements OnClickListener {          @Override          public void onClick(View v) {              // 跳转某页面  ,自己实现跳转的动作,就可以点击TextView中的指定文字进行自定义的动作的了         }      }

然后在工程中调用方法：

textView.setText(Html.fromHtml(“点击这里跳转到游戏”,null, new GameTagHandler()));

textView.setClickable(true);

textView.setMovementMethod(LinkMovementMethod.getInstance());