Android Html.fromHtml 耗时太长

如果我该怎么办tv.setText(Html.fromHtml(text));时间太长，UI 挂起？ 如果我可以用线程来做，你能提供一个例子吗？

private Handler mHandler = new Handler() {
     void handleMessage(Message msg) {
          switch(msg.what) {
               case UPDATE_TEXT_VIEW:
                    tv.setText(msg.obj); // set text with Message data
                    break;
          }
     }
}

Thread t = new Thread(new Runnable() {
     // use handler to send message to run on UI thread.
     mHandler.sendMessage(mHandler.obtainMessage(UPDATE_TEXT_VIEW, Html.fromHtml(text));
});
t.start();