android教程之textview解析带图片的html示例
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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