Update TextView fields in onPostExecute()

问题

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();
...  

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

回答1:

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 );
      } 
   }
}

来源：https://stackoverflow.com/questions/35193069/update-textview-fields-in-onpostexecute