更新onPostExecute()中的TextView字段

问题描述

我正在使用AsyncTask的doInBackground()方法解析天气数据，并将解析后的数据存储在字符串中:

I'm parsing weather data in AsyncTask's doInBackground() method and storing parsed data in strings:

protected Void doInBackground(Void... params) {

...
Element element = (Element) list.item(i);
 if (element.getNodeName().equals("station_id")){
    String stationId = element.getTextContent();
   } else if (element.getNodeName().equals("observation_time") ){
    String observationTime = element.getTextContent();
...

我的UI中有2个TextViews.如何在onPostExecute()中使用stationId和observationTime字符串更新它们?

I have 2 TextViews in my UI. How do I update them in onPostExecute() with stationId and observationTime strings?

推荐答案

将您的doInBackground返回类型从Void更改为Element.现在在onPostExecute中，您将获得Element的对象.使用此对象可以提取值并将其设置为TextViews.

Change your doInBackground return type to Element from Void. Now in onPostExecute you will get object of Element. Use this object to extract values and set into TextViews.

public class YourTask extends AsyncTask<Void, Void, Element> {

   TextView textView1, textView2;

   public YourTask (TextView textView1, TextView textView2) {
       this.textView1 = textView1;
       this.textView2 = textView2;
   }

   @Override
   protected Element doInBackground(Void... params) {
      ...
      Element element = (Element) list.item(i);
      return element;
   }

   @Override
   protected void onPostExecute(Element element) {
      if (element.getNodeName().equals("station_id")){
         String stationId = element.getTextContent();
         textView1.setText(stationId);
      } else if (element.getNodeName().equals("observation_time") ){
         String observationTime = element.getTextContent();
         textView2.setText(observationTime );
      }
   }
}

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