How to implement progress bar while doing stuff?

Question

i need to set a circular progress bar while doing some stuff. I've already done this:

progressBar = (ProgressBar) findViewById(R.id.progressBar1);

in my OnCreate() and then called progressBar.setVisibility(View.Visible) and View.Gone after doing things, but the progressBar is not displaying.

 progressBar.setVisibility(View.VISIBLE);
 thumbnailAux = doThings(thumbnail);
 image.setImageBitmap(thumbnailAux);
 progressBar.setVisibility(View.GONE);

The method doThings takes a few seconds to complete execute. Please help!!

Answer 1

Android has a Predefined class for a progress bar, its in a class called ProgressDialog. It looks like this:

You can add this codes in your onCreate() and set the state of the progressDialog like this:

ProgressDialog progress = new ProgressDialog(this);

Also add this following code to a background Thread.

private class ProgressThread extends Thread {

    private ProgressDialog progress;

    public ProgressThread(Context context, ProgressDialog progress) {
        progress.setMessage("Downloading Music :) ");
        progress.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        progress.setIndeterminate(true);
    }

    public void run() {
        // update progressbar here
    }
}

For more details you can check the Android API Documentation here

This site has a full application demo about it, you might want to check it out.

Answer 2

You can apply AsyncTask for this case.

You can refer more information from this link.

You can add progressDialog to onPreExecute method and then dismiss in onPostExecute method.

// Async Task to access the web
    private class YourTask extends AsyncTask<String, Void, String> {
            ProgressDialog myPd_bar;
        @Override
        protected void onPreExecute() {
            // TODO Auto-generated method stub
            myPd_bar=new ProgressDialog(class.this);
            myPd_bar.setMessage("Loading....");
            myPd_bar.setTitle(Title);
            myPd_bar.show();
            super.onPreExecute();
        }

        @Override
        protected String doInBackground(String... params) {

             //Things should do in, until progress bar close
             return null;

        }

        @Override
        protected void onPostExecute(String result) {

            myPd_bar.dismiss();
        }
    }// end async task