Question

I have a tablayout with several activities in it, and changing from a tab to another one takes a couple of seconds (because it needs lots of datas). While it is loading I want a dialog appear that indicates the loading. I created a very simple dialog with a progress bar, but I dont know when to call it and when to dismiss it.

 loading = new Dialog(FatActivity.this);
        loading.requestWindowFeature(Window.FEATURE_NO_TITLE);
        loading.setContentView(R.layout.dialog_loading);
        loading.show();

Every tab shows an activity, but if I put it in the onCreate() method (right after it, so to the first row), it doesnt appear, only after the activity loaded. So where should I put it, or if it is a wrong approach of making a loading screen then how should I do this? I was thinking about this, because I just have to call it then dismiss it at the end of the onCreate(). And since it is a tablayout there is no onclicklistener on the tabs, so I cannot use it either.

Thanks in advance!

Answer 1

You can use AsyncTask best way to display Loading screen…

onCreate()
{
    dialog.show();
    new LoadData().execute(null);
}
--------------------------------------------------------------------------     
    private class LoadData extends AsyncTask<URL, Integer, Boolean> {
         protected Long doInBackground(URL... urls) {
             // your code to load data here <------
             return true;
         }

         protected void onPostExecute(Boolean result) {
             dialog.dismiss();
         }
     }