android教程之textview解析带图片的html示例

程序员文章站 2022-06-19 19:55:37

复制代码代码如下:public class mainactivity extends activity { private handler handler;...

public class mainactivity extends activity {

private handler handler;
private string html;
private textview tv;
private progressbar bar;

@override
protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_main);
  // 网上找的html数据
  html = "<html><head><title>textview使用html</title></head><body><p><strong>强调</strong></p><p><em>斜体</em></p>"
    + "<p><a href=\"//www.jb51.net">超链接html入门</a>学习html!</p><p><font color=\"#aabb00\">颜色1"
    + "</p><p><font color=\"#00bbaa\">颜色2</p><h1>标题1</h1><h3>标题2</h3><h6>标题3</h6><p>大于>小于<</p><p>"
    + "下面是网络图片</p><img src=\"//www.jb51.net/1207.jpg\"/></body>"
    + "下面是网络图片</p><img src=\"//www.jb51.net/207.jpg\"/></body></html>";

  tv = (textview) this.findviewbyid(r.id.id);
  bar = (progressbar) this.findviewbyid(r.id.id_bar);
  tv.setmovementmethod(scrollingmovementmethod.getinstance());// 滚动

  handler = new handler() {
   @override
   public void handlemessage(message msg) {
    // todo auto-generated method stub
    if (msg.what == 0x101) {
     bar.setvisibility(view.gone);
     tv.settext((charsequence) msg.obj);
    }
    super.handlemessage(msg);
   }
  };

  // 因为从网上下载图片是耗时操作所以要开启新线程
  thread t = new thread(new runnable() {
   message msg = message.obtain();

   @override
   public void run() {
    // todo auto-generated method stub
    bar.setvisibility(view.visible);
    /**
     * 要实现图片的显示需要使用html.fromhtml的一个重构方法：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 imagegetter = new imagegetter() {

     @override
     public drawable getdrawable(string source) {
      // todo auto-generated method stub
      url url;
      drawable drawable = null;
      try {
       url = new url(source);
       drawable = drawable.createfromstream(
         url.openstream(), null);
       drawable.setbounds(0, 0,
         drawable.getintrinsicwidth(),
         drawable.getintrinsicheight());
      } catch (malformedurlexception e) {
       // todo auto-generated catch block
       e.printstacktrace();
      } catch (ioexception e) {
       // todo auto-generated catch block
       e.printstacktrace();
      }
      return drawable;
     }
    };
    charsequence test = html.fromhtml(html, imagegetter, null);
    msg.what = 0x101;
    msg.obj = test;
    handler.sendmessage(msg);
   }
  });
  t.start();
}

@override
public boolean oncreateoptionsmenu(menu menu) {
  // inflate the menu; this adds items to the action bar if it is present.
  getmenuinflater().inflate(r.menu.main, menu);
  return true;
}

}

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