Show ProgressDialog Android

Declare your progress dialog:

ProgressDialog progress;

When you're ready to start the progress dialog:

progress = ProgressDialog.show(this, "dialog title",    "dialog message", true);

and to make it go away when you're done:

progress.dismiss();

Here's a little thread example for you:

// Note: declare ProgressDialog progress as a field in your class.progress = ProgressDialog.show(this, "dialog title",  "dialog message", true);new Thread(new Runnable() {  @Override  public void run()  {    // do the thing that takes a long time    runOnUiThread(new Runnable() {      @Override      public void run()      {        progress.dismiss();      }    });  }}).start();

I am using the following code in one of my current projects where i download data from the internet. It is all inside my activity class.

// ---------------------------- START DownloadFileAsync // -----------------------//class DownloadFileAsync extends AsyncTask<String, String, String> {    @Override    protected void onPreExecute() {        super.onPreExecute();        // DIALOG_DOWNLOAD_PROGRESS is defined as 0 at start of class        showDialog(DIALOG_DOWNLOAD_PROGRESS);    }    @Override    protected String doInBackground(String... urls) {        try {            String xmlUrl = urls[0];            URL u = new URL(xmlUrl);            HttpURLConnection c = (HttpURLConnection) u.openConnection();            c.setRequestMethod("GET");            c.setDoOutput(true);            c.connect();            int lengthOfFile = c.getContentLength();            InputStream in = c.getInputStream();            byte[] buffer = new byte[1024];            int len1 = 0;            long total = 0;            while ((len1 = in.read(buffer)) > 0) {                total += len1; // total = total + len1                publishProgress("" + (int) ((total * 100) / lengthOfFile));                xmlContent += buffer;            }        } catch (Exception e) {            Log.d("Downloader", e.getMessage());        }        return null;    }    protected void onProgressUpdate(String... progress) {        Log.d("ANDRO_ASYNC", progress[0]);        mProgressDialog.setProgress(Integer.parseInt(progress[0]));    }    @Override    protected void onPostExecute(String unused) {        dismissDialog(DIALOG_DOWNLOAD_PROGRESS);    }}@Overrideprotected Dialog onCreateDialog(int id) {    switch (id) {    case DIALOG_DOWNLOAD_PROGRESS:        mProgressDialog = new ProgressDialog(this);        mProgressDialog.setMessage("Retrieving latest announcements...");        mProgressDialog.setIndeterminate(false);        mProgressDialog.setMax(100);        mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);        mProgressDialog.setCancelable(true);        mProgressDialog.show();        return mProgressDialog;    default:        return null;    }}

While creating the object for the progressbar check the following.

This fails:

dialog = new ProgressDialog(getApplicationContext());

While adding the activities context works..

dialog = new ProgressDialog(MainActivity.this);