定期刷新/重新加载活动

Question

I have one activity. OnCreate the activity gets the source (html) of a web page to a string and presents the result (after parsing it a bit) in a textview.

I would like the activity to reload/refresh periodically to always present the latest information.

What is the best solution for this?

Answer 1

First of all... separate the updating logic from your onCreate method. So, for instance, you can create an updateHTML() .

Then, you can use a Timer in order to update the page periodically:

public class YourActivity extends Activity {

 private Timer autoUpdate;

 public void onCreate(Bundle b){
  super.onCreate(b);
  // whatever you have here
 }

 @Override
 public void onResume() {
  super.onResume();
  autoUpdate = new Timer();
  autoUpdate.schedule(new TimerTask() {
   @Override
   public void run() {
    runOnUiThread(new Runnable() {
     public void run() {
      updateHTML();
     }
    });
   }
  }, 0, 40000); // updates each 40 secs
 }

 private void updateHTML(){
  // your logic here
 }

 @Override
 public void onPause() {
  autoUpdate.cancel();
  super.onPause();
 }
}

Notice that I'm canceling the updating task on onPause , and that in this case the updateHTML method is executed each 40 secs (40000 milliseconds). Also, make sure you import these two classes: java.util.Timer and java.util.TimerTask .