Question

Elegant Solution

Hey People.
I’m currently working on a Project and I am thinking of an elegant solution for the implementation, I’m tired of improvised solutions.

Let me try to explain my “Problem” to you:

The task of this part of my app is pretty simple:

I want my app to download some stuff and process that downloaded file in the background, displaying a ProgressDialog in the meantime. After that, the contents should be returned in a List of Strings which are displayed in some ListActivity. So far, not a big deal:

Downloader and the processing stuff is a subclassed AsyncTask and called in a class different from the main Activity. But now my Problem:

Where to call the Progressdialog? And how can the GUI-Thread “react” with a ProgressDialog? Should I call the ProgressDialog from the processing class or is it better to kind of “block” the main class, waiting for a notification?

Greetings

EnflamedSoul

Answer 1

Define your progess dialog as a global variable.

ProgressDialog pd;

Where you are going to fire off the asyncTask:

showYourProgressDialog;
thread = new aThread().execute();

In your class:

public class aThread extends AsyncTask<Void, Void, Void> {
        @Override
        protected Void doInBackground(Void... args) {
            try {
                //Do your downloading and stuff
                                asyncHandler.sendMessage(asyncHandler.obtainMessage(0));
            } catch (Exception e) {
                Log.e("1", "Error", e);
            }
            return null;
        }
    }

Handler asyncHandler = new Handler() {
        public void handleMessage(Message msg) {
            pd.dismiss();
            if (msg.what == 0) {
                //update what you need to               
            }           
        }
    };