How to correctly notify this adapter its dataset has changed?

Question

I am asynchronously downloading images that will be part of a GridView. And to update the GridView within the onCreate(), I call notifyDataSetChanged(); on a runOnUiThread();

Now, my question is:

Is there a better way to do this? I am setting the Thread to sleep for 2 seconds to ensure the images will be there the time the data in the adapter gets changed. But, of course, I am hardcoding this condition (It may take more than 2 seconds), and the internet connection might fail preventing the GridView update correctly.

Here is the Thread,

private Runnable myRunnable = new Runnable(){

@Override
public void run() {
    try {
        Thread.sleep(2000); 
        updateData(); // contains notifyDataSetChanged()
        if(images[0] == null){
        Toast.makeText(getApplicationContext(), 
"Your Internet Connection is not working properly", Toast.LENGTH_SHORT).show();                 
        }
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
    }

};

Thank you very much!

Answer 1

You can use AsyncTask class. It has three important abstract functions. doInBackground onPostExecute onPreExecute

You can search about this on internet and also can check this link.