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I would like to start an AlertDialogue showing a loading message and a ProgressBar icon, then on showing the dialogue I would run the heavy processing with the ProgressBar spinning, and finally cancel the dialogue when the processing is over.

I have tried putting the logic on setOnShowListener of the alert dialogue which was not carried out. Then, I have tried starting the dialogue then using a delayed handler like the following:

 new Handler().postDelayed(new Runnable()
 
 @Override
 public void run()
 
 // heavy procssing logic
 // alert.dismiss();
 
 , 1000);

Though, the ProgressBar icon stopped spinning, so I assumed that my heavy processing blocked the UI. How do I achieve what I need. Thanks.

Edit: I have replaced the handler with new Thread() and everything worked properly. Would this approach cause any problems like memory leaks?

Create a new AsyncTask to do your work, this will cause any code placed in the “doInBackground()” method to be ran in a background thread, you have pre-execute and post-execute to run code on the main thread, my recommendation is create an alertDialog in the pre-execute methods and close it on the post-execute, using “publishProgress()” method In the doInBackground method to update your dialog as you need.

Otherwise instead of an alertDialog (or as well as) you can use a progressBar, simply have it in the view preciously, instantiate it as you normally would.

<ProgressBar
 android:id=“+id/progressBar”
 android:layout_width=“wrap_content”
 android:layout_height=“wrap_content”
 android:centreInParent=true
 android:indeterminate=true
 android:visibility=gone />

ProgressBar progressBar = view.findViewById(R.id.progressBar)

Now when you want to show the progress bar use

 progressBar.setVisibility(visible)

Or to hide

 progressBar.setVisibility(gone)