Progress Bar while media player is preparing

If someone Still facing this problem here is the code below

      AsyncTask<Void, Void, Void> task = new AsyncTask<Void, Void, Void>() {

            @Override
            protected void onPreExecute() {
                if(translation.equals("NIV"))
                {
                    if(AudioPlaying==false)
                    {
                        mediaPlayer = new MediaPlayer();
                        mediaPlayer.setOnPreparedListener(Main.this);
                        mediaController = new MediaController(Main.this);
                    }
                    else
                        mediaController.show();
                }
                else
                    Toast.makeText(getBaseContext(), "عفوا, جاري تحميل ملفات الصوت الخاصة بترجمة الفانديك ", Toast.LENGTH_LONG).show();
                pd = new ProgressDialog(Main.this);
                pd.setTitle("Processing...");
                pd.setMessage("Please wait.");
                pd.setCancelable(false);
                pd.setIndeterminate(true);
                pd.show();

            }

            @Override
            protected Void doInBackground(Void... arg0) {
                try {
                    //Do something...
                    //Thread.sleep(5000);
                    try 
                    {
                        mediaPlayer.setDataSource(AudioUrlPath);
                        mediaPlayer.prepare();
                        mediaPlayer.start();
                        AudioPlaying=true;
                    } 
                    catch (IOException e) {
                        Log.e("AudioFileError", "Could not open file " + AudioUrlPath + " for playback.", e);
                    }

                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                return null;
            }

            @Override
            protected void onPostExecute(Void result) {
                if (pd!=null) {
                    pd.dismiss();
                    //b.setEnabled(true);
                }
            }

        };
        task.execute((Void[])null);

The issue lies in that you are not doing anything asynchronously here, and you should be. You should use an AsyncTask to do your work.

Take a look at 'the 4 steps', as detailed here:

The 4 steps

When an asynchronous task is executed, the task goes through 4 steps:

1. onPreExecute(), invoked on the UI thread immediately after the task is executed. This step is normally used to setup the task, for instance by showing a progress bar in the user interface.
2. doInBackground(Params...), invoked on the background thread immediately after onPreExecute() finishes executing. This step is used to perform background computation that can take a long time. The parameters of the asynchronous task are passed to this step. The result of the computation must be returned by this step and will be passed back to the last step. This step can also use publishProgress(Progress...) to publish one or more units of progress. These values are published on the UI thread, in the onProgressUpdate(Progress...) step.
3. onProgressUpdate(Progress...), invoked on the UI thread after a call to publishProgress(Progress...). The timing of the execution is undefined. This method is used to display any form of progress in the user interface while the background computation is still executing. For instance, it can be used to animate a progress bar or show logs in a text field.
4. onPostExecute(Result), invoked on the UI thread after the background computation finishes. The result of the background computation is passed to this step as a parameter.

EDIT:

You can create an anonymous inner class to do your bidding, which may be similar to how you are creating your onClick handler. In your onClick do something like this:

//pseudo-code...
onClick(View v, ...) {
    new AsyncTask<Generic1, Generic2, Generic3>() {
        protected void onPreExecute() {
            // do pre execute stuff...
        }

        protected Generic3 doInBackground(Generic1... params) {
            // do background stuff...
        }

        protected void onPostExecute(Generic3 result) {
            // do post execute stuff...
        }
    }.execute();
}

Don't forget to keep an eye on your generics here!