AsyncTask

MainActivity.java

//...

new AsyncTask<Void, Void, String>() {
	@Override
	protected void onPreExecute() {
		//...
	}

	@Override
	protected String doInBackground(Void... voids) {
		return performBlockingTask();
	}

	@Override
	protected void onProgressUpdate(Integer... progress) {
		mProgessBar.setProgress(progress);
	}

	@Override
	protected void onPostExecute(String result) {
		mTextView.setText(result);
	}
   
}.execute();

//...