Android中只支持下列html标签:

Android TextView 支持的HTML标签

  • <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>
  • <br>  //  换行</br>不可用

那如果我们还要实现一些标签怎么办呢

那则需要自己实现TagHandler接口了。

实现的概要说明:

Step one 继承 TagHandler接口

Step Two 实现

public void handleTag(boolean opening, String tag, Editable output,

XMLReader xmlReader)

 

接口被调用的过程:

 

系统在解析html文本

发现tag时调用一次 如<html>

接口传递的参数为 handleTag(true,”html”,output , xmlReader )

 

发现tag的闭合时,调用接口

接口传递的参数为 handleTag(false,”html”,output , xmlReader )

 

下面是一个实际执行的例子 给< strike> 标签 中的文字加上横线

public class MyHtmlTagHandler implements TagHandler {

       public void handleTag(boolean opening, String tag, Editable output,
                XMLReader xmlReader) {
            if(tag.equalsIgnoreCase("strike") || tag.equals("s")) {
                processStrike(opening, output);
            }
        }

        private void processStrike(boolean opening, Editable output) {
            int len = output.length();
            if(opening) {
                output.setSpan(new StrikethroughSpan(), len, len, Spannable.SPAN_MARK_MARK);
            } else {
                Object obj = getLast(output, StrikethroughSpan.class);
                int where = output.getSpanStart(obj);

                output.removeSpan(obj);

                if (where != len) {
                    output.setSpan(new StrikethroughSpan(), where, len, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
                }
            }
        }

        private Object getLast(Editable text, Class kind) {
            Object[] objs = text.getSpans(0, text.length(), kind);

            if (objs.length == 0) {
                return null;
            } else {
                for(int i = objs.length;i>0;i--) {
                    if(text.getSpanFlags(objs[i-1]) == Spannable.SPAN_MARK_MARK) {
                        return objs[i-1];
                    }
                }
                return null;
            }
        }

}

 

显示超链接,并响应事件

public class HTMLIMGActivity extends Activity {

    private TextView tv_img;
    String html = "<h1>text3:</h1>"
            +"<font color='#00FF00'>the content is hehe</font><br>"
            +"<a href='http://www.google.com'>link to google~~~</a>";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        tv_img = (TextView) findViewById(R.id.tv_img);
        URLImageParser p = new URLImageParser(tv_img, HTMLIMGActivity.this);
        Spanned htmlSpan = Html.fromHtml(html, p, null);
        Log.i("hehehe", "spannestring:"+htmlSpan);
        tv_img.setText(htmlSpan);
        tv_img.setMovementMethod(LinkMovementMethod.getInstance());//不加这句无法链接,点了无反应
    }
}

要想点击有反应,要注意下列事项:

1:不能设置TextView的android:autoLink属性。

2:必须加上tv_img.setMovementMethod(LinkMovementMethod.getInstance());这句。

3:a标签中的地址可以使用<a href='http://www.google.com'>link to google~~~</a>这种形式。

同样也可以使用<a href=\"http://www.google.com\">link to google~~~</a>

 

 响应事件

 

public class MyTagHandler implements TagHandler {
        
        int start;
                                                                                                                                                                                                                                                                                                                                                                                       
        int stop;
                                                                                                                                                                                                                                                                                                                                                                                       
        Context context;
                                                                                                                                                                                                                                                                                                                                                                                       
        int color;
                                                                                                                                                                                                                                                                                                                                                                                       
        public MyTagHandler(Context context, int color) {
            this.context = context;
            this.color = color;
        }
                                                                                                                                                                                                                                                                                                                                                                                       
        @Override
        public void handleTag(boolean opening, String tag, Editable output, XMLReader xmlReader) {
            if (tag.toLowerCase().equals("mytag")) {
                if (opening) {
                    start = output.length();
                } else {
                    stop = output.length();
                    String content = output.subSequence(start, stop).toString();
                    output.setSpan(new MySpan(context, color, content), start, stop,
                            Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
                }
            }
        }
                                                                                                                                                                                                                                                                                                                                                                                       
        class MySpan extends ClickableSpan implements OnClickListener {
                                                                                                                                                                                                                                                                                                                                                                                       
            String content;
                                                                                                                                                                                                                                                                                                                                                                                       
            int color;
                                                                                                                                                                                                                                                                                                                                                                                       
            int type;
                                                                                                                                                                                                                                                                                                                                                                                       
            Context context;
                                                                                                                                                                                                                                                                                                                                                                                       
            @Override
            public void updateDrawState(TextPaint ds) {
                ds.setColor(color);//设置颜色
                ds.setUnderlineText(false);//是否显示下划线
            }
                                                                                                                                                                                                                                                                                                                                                                                       
            public MySpan(Context context, int color, String content) {
                this.context = context;
                this.color = color;
                this.content = content;
            }
                                                                                                                                                                                                                                                                                                                                                                                       
            @Override
            public void onClick(View widget) {
                //添加点击事件
                Toast.makeText(context, content, Toast.LENGTH_SHORT).show();
            }
                                                                                                                                                                                                                                                                                                                                                                                       
        }
                                                                                                                                                                                                                                                                                                                                                                                       
    }
posted on 2013-05-15 14:18  smallerpig  阅读(1298)  评论(0编辑  收藏  举报