Android: Activity taking too long to display because of web service Http Request

Question

One of my activities make a http request to a webservice to get some weather data when I start the application.

The issue that the activity will take 3-4 seconds to disp

Answer 1

This is regarding AsyncTask, I just want to help understanding the concept, it is really useful:

        DownloadFilesTask dft = new DownloadFilesTask(this);
        //Executes the task with the specified parameters
        dft.execute(Void1...);

        ...
        ...
        ...

        dft.cancel(boolean);

private class DownloadFilesTask extends AsyncTask {
        //Runs on the UI thread before doInBackground(Void1...)
        protected void onPreExecute() {

        }
        //runs in BACKGROUNG threat
        protected Void3 doInBackground(Void1... urls) {
            //it can be invoked from doInBackground(Void1...) to publish updates 
            //on the UI thread while doInBackground(Void1...) is still running
            publishProgress(Void2...);
        }
        //Runs on the UI thread after publishProgress(Void2...) is invoked
        protected void onProgressUpdate(Void2... progress) {

        }
        //Runs on the UI thread after doInBackground(Void1...) has finished
        protected void onPostExecute(Void3) {

        }
        //runs in UI threat after cancel(boolean) is invoked and 
        //doInBackground(Void1...) has finished
        protected void onCancelled(Void3) {

        }
}