Q:

No output after asyncTask completes in Android app

The output for this activity produces a blank screen with titlebar. What am I doing wrong here? Removing asyncTask method gives the output perfectly, but with time delay. Please help me out.
public class viewstoryActivity extends Activity {
    public Context context;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.list);
        context = this;
        DownloadTask task = new DownloadTask();
        task.execute();
    }

    public void test() {
        try {
            LinearLayout layout[];
            LinearLayout layout2[];
            LinearLayout layout3[];
            TextView name[];
            TextView desc[];
            TextView viewCount[];
            ImageView website[];
            ImageView star[];
            TextView category[];
            URL url = new URL("http://gdata.youtube.com/feeds/api/videos?start-index=1&max-results=25&vq=itsaperfectstory&orderby=relevance");
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            DocumentBuilder db = dbf.newDocumentBuilder();
            Document doc = db.parse(new InputSource(url.openStream()));
            // doc.getDocumentElement().normalize();
            NodeList nodeList = doc.getElementsByTagName("entry");
            layout = new LinearLayout[nodeList.getLength()];
            layout2 = new LinearLayout[nodeList.getLength()];
            layout3 = new LinearLayout[nodeList.getLength()];
            name = new TextView[nodeList.getLength()];
            desc = new TextView[nodeList.getLength()];
            viewCount = new TextView[nodeList.getLength()];
            website = new ImageView[nodeList.getLength()];
            star = new ImageView[nodeList.getLength()];
            category = new TextView[nodeList.getLength()];
            for (int i = 0; i < nodeList.getLength(); i++) {
                Node node = nodeList.item(i);
                layout[i] = new LinearLayout(context);
                layout[i].setOrientation(LinearLayout.HORIZONTAL);
                layout[i].setBackgroundResource(R.anim.bg);
                layout[i].setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, 150));
                layout2[i] = new LinearLayout(context);
                layout2[i].setOrientation(LinearLayout.VERTICAL);
                layout2[i].setLayoutParams(new LayoutParams(400, 150));
                layout3[i] = new LinearLayout(context);
                layout3[i].setOrientation(LinearLayout.VERTICAL);
                layout3[i].setLayoutParams(new LayoutParams(150, 150));
                name[i] = new TextView(context);
                desc[i] = new TextView(context);
                viewCount[i] = new TextView(context);
                website[i] = new ImageView(context);
                star[i] = new ImageView(context);
                category[i] = new TextView(context);
                name[i].setPadding(10, 20, 0, 0);
                name[i].setTextSize(16);
                Element fstElmnt = (Element) node;
                NodeList nameList = fstElmnt.getElementsByTagName("title");
                Element nameElement = (Element) nameList.item(0);
                nameList = nameElement.getChildNodes();
                name[i].setText(((Node) nameList.item(0)).getNodeValue());
                name[i].setLines(1);
                NodeList websiteList = fstElmnt.getElementsByTagName("media:content");
                Element websiteElement = (Element) websiteList.item(0);
                websiteList = websiteElement.getChildNodes();
                final String url1 = websiteElement.getAttribute("url");
                NodeList websiteList1 = fstElmnt.getElementsByTagName("media:thumbnail");
                Element websiteElement1 = (Element) websiteList1.item(0);
                String test = websiteElement1.getAttribute("url");
                NodeList descitem = fstElmnt.getElementsByTagName("content");
                Element descElement = (Element) descitem.item(0);
                nameList = descElement.getChildNodes();
                desc[i].setText(((Node) nameList.item(0)).getNodeValue());
                desc[i].setLines(1);
                desc[i].setTextColor(Color.DKGRAY);
                desc[i].setPadding(10, 8, 0, 0);
                NodeList gditem = fstElmnt.getElementsByTagName("yt:statistics");
                Element gdElement = (Element) gditem.item(0);
                String view1 = gdElement.getAttribute("viewCount");
                viewCount[i].setText(view1 + " views");
                viewCount[i].setPadding(10, 8, 0, 0);
                Bitmap bm = null;
                URL aURL = new URL(test);
                URLConnection conn = aURL.openConnection();
                conn.connect();
                InputStream is = conn.getInputStream();
                BufferedInputStream bis = new BufferedInputStream(is);
                bm = BitmapFactory.decodeStream(bis);
                bis.close();
                is.close(); // TODO: handle exception
                website[i].setImageBitmap(bm);
                website[i].setPadding(30, 20, 0, 0);
                layout3[i].addView(website[i]);
                layout2[i].addView(name[i]);
                layout2[i].addView(desc[i]);
                layout2[i].addView(viewCount[i]);
                NodeList staringitem = fstElmnt.getElementsByTagName("gd:rating");
                if ((staringitem == null) || (staringitem.getLength() == 0)) {
                    star[i].setImageResource(R.drawable.star0);
                    layout2[i].addView(star[i]);
                } else {
                    Element starElement = (Element) staringitem.item(0);
                    String stars = starElement.getAttribute("average");
                    double d = Double.parseDouble(stars);
                    DecimalFormat decimalFormat = new DecimalFormat("#");
                    stars = decimalFormat.format(d);
                    if (stars.contentEquals("1")) {
                        star[i].setImageResource(R.drawable.star1);
                        layout2[i].addView(star[i]);
                    } else if (stars.contentEquals("2")) {
                        star[i].setImageResource(R.drawable.star2);
                        layout2[i].addView(star[i]);
                    } else if (stars.contentEquals("3")) {
                        star[i].setImageResource(R.drawable.star3);
                        layout2[i].addView(star[i]);
                    } else if (stars.contentEquals("4")) {
                        star[i].setImageResource(R.drawable.star4);
                        layout2[i].addView(star[i]);
                    } else if (stars.contentEquals("5")) {
                        star[i].setImageResource(R.drawable.star5);
                        layout2[i].addView(star[i]);
                    } else if (stars.contentEquals("0")) {
                        star[i].setImageResource(R.drawable.star0);
                        layout2[i].addView(star[i]);
                    }
                }
                layout[i].addView(layout3[i]);
                layout[i].addView(layout2[i]);
                // layout.addView(category[i]);
                // layout[i].addView(img[i]);
                LinearLayout layout1 = (LinearLayout) findViewById(R.id.LinearLayout);
                ((LinearLayout) layout1).addView(layout[i]);
                layout[i].setOnClickListener(new OnClickListener() {
                    public void onClick(View v) {
                        Bundle bundle = new Bundle();
                        bundle.putString("url", url1);
                        Intent intent = new Intent(viewstoryActivity.this, VidActivity.class);
                        intent.putExtras(bundle);
                        startActivityForResult(intent, 0);
                        overridePendingTransition(R.anim.right_slide_out, R.anim.right_slide_out);
                    }
                });
            }
        } catch (Exception e) {
            System.out.println("XML Pasing Excpetion = " + e);
        }
    }

    private class DownloadTask extends AsyncTask<String, Void, String> {
        ProgressDialog progressDialog;

        @Override
        protected void onPreExecute() {
            progressDialog = ProgressDialog.show(viewstoryActivity.this, "Progress Dialog Title Text", "Process Description Text", true);
            // do initialization of required objects objects here
        };

        @Override
        protected String doInBackground(String... urls) {
            test();
            return "";
        };

        @Override
        protected void onPostExecute(String result) {
            super.onPostExecute(result);
            progressDialog.dismiss();
        };
    }
}

A:

All your tasks which are influencing the UI should be done on UI Thread, not in background thread.
Move all your such statements to onPostExecute()
Suggestion:
take two class level variable
LinearLayout container; // R.id.LinearLayout1 in your case
LinearLayout holder;  // you will initialize it in your test() method

initialize container inside onCreate() by findViewById(R.id.LinearLayout1); and get the container Layout from your layout.xml in which you want your Views to be added after downloading.
now in test() method called from doInBackground()
initialize the holder as
holder = new LinearLayout(this);

add all childs to holder.
then in onPostExecute() add that holder to container.

