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[Here is a screenshot of the DetailActivity&& Here is a screenshot of the Main Activity ][1]I am trying to parse an XML document using xmlPullParser and distribute the retrieved data to two activities:

• 
  MainActivity: includes 3 properties


• 
  DetailActivity: includes all the other data.

I have two questions:

1. How to parse all the tags and retrieve their data in xml document using xmlPullParser.


2. How to display the data of the DetailActiviy whenever a RecyclerView item is clicked.

I have tried to parse the xml document twice. Once for the main data and second for the extra data i need for the detail activity either by opening connection twice (work around but too bad way) or by storing the retrieved data in a list and returning two new constructors instead of one(the list is not displaying anymore).

Here is my MainActivity:

public class MainActivity extends AppCompatActivity implements AdsAdapter.AdsAdapterOnClickHandler

{





    public static final String URL = "DISPLAYED BELOW";

       private static final String TAG = MainActivity.class.getSimpleName();

       public static List entries = new ArrayList<>();

       private RecyclerView mRecyclerView;

       private AdsAdapter mAdsAdapter;





@Override

protected void onCreate(Bundle savedInstanceState)

{

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);



    mRecyclerView = (RecyclerView) findViewById(R.id.recyclerview_ad);



    int recyclerViewOrientation = LinearLayoutManager.VERTICAL;



    boolean shouldReverseLayout = false;

    LinearLayoutManager layoutManager

            = new LinearLayoutManager(this, recyclerViewOrientation, shouldReverseLayout);

    mRecyclerView.setLayoutManager(layoutManager);



    mRecyclerView.setHasFixedSize(true);



    mAdsAdapter = new AdsAdapter(this);



    mRecyclerView.setAdapter(mAdsAdapter);

    loadPage();

}





public void loadPage() {

    new DownloadXmlTask().execute(URL);

    System.out.print("Result" + "Succeed");

}



private class DownloadXmlTask extends AsyncTask<String, Void, List<AdEntry>>

{

    @Override

    protected List<AdEntry> doInBackground(String... urls)

    {

        try

        {

            return loadXmlFromNetwork(urls[0]);

        }

        catch (IOException e)

        {

            return null;

        }

        catch (XmlPullParserException e)

        {

            return null;

        }

    }



    @Override

    protected void onPostExecute(List<AdEntry> adEntries)

    {

        Toast.makeText(MainActivity.this, "Successfully Processed", Toast.LENGTH_SHORT).show();

        System.out.println("Successfully Processed");

        mAdsAdapter.setAdData(adEntries);

        super.onPostExecute(adEntries);

    }

}



public List<AdEntry> loadXmlFromNetwork(String urlString) throws XmlPullParserException, IOException {

    InputStream stream = null;

    try

    {

        stream = downloadUrl(urlString);

        entries = parse(stream);

    }

    finally

    {

        if (stream != null)

            stream.close();

    }

    System.out.println("FinalDataResult" + entries);

    return entries;

}



public InputStream downloadUrl(String urlString) throws IOException

{

    URL url = new URL(urlString);

    HttpURLConnection conn = (HttpURLConnection) url.openConnection();

    conn.setReadTimeout(10000 /* milliseconds */);

    conn.setConnectTimeout(15000 /* milliseconds */);

    conn.setRequestMethod("GET");

    conn.setDoInput(true);

    conn.connect();

    return conn.getInputStream();

}



@Override

public void onClick(AdEntry ad)

{

    Context context = this;

    Class destinationClass = DetailActivity.class;

    Intent intentToStartDetailActivity = new Intent(context, destinationClass);

    intentToStartDetailActivity.putExtra("Product Name",ad.productName);

    intentToStartDetailActivity.putExtra("Product Thumbnail", ad.productThumbnail);;

    startActivity(intentToStartDetailActivity);

}

}

Here is my XMLPullParser:

public class AdXmlParser {

private static final String ns = null;



public static List parse(InputStream in) throws XmlPullParserException, IOException {

    try {

        XmlPullParser parser = Xml.newPullParser();

        parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);

        parser.setInput(in, null);

        parser.nextTag();

        return readAds(parser);

    } finally {

        in.close();

    }

}



public static List detailParse(InputStream in) throws XmlPullParserException, IOException {

    try {

        XmlPullParser parser = Xml.newPullParser();

        parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);

        parser.setInput(in, null);

        parser.nextTag();

        return readExtras(parser);

    } finally {

        in.close();

    }

}



private static List readAds(XmlPullParser parser) throws XmlPullParserException, IOException {

    List<AdEntry> entries = new ArrayList();



    parser.require(XmlPullParser.START_TAG, ns, "ads");



    while (parser.next() != XmlPullParser.END_TAG) {

        if (parser.getEventType() != XmlPullParser.START_TAG)

            continue;



        String name = parser.getName();

        if (name.equals("ad"))

            entries.add(readEntry(parser));

        else

            skip(parser);

    }



    System.out.println("entries" + entries);

    return entries;

}



private static List<AdEntry> readExtras(XmlPullParser parser) throws XmlPullParserException, IOException {

    List<AdEntry> extras = new ArrayList();



    parser.require(XmlPullParser.START_TAG, ns, "ads");

    while (parser.next() != XmlPullParser.END_TAG) {

        if (parser.getEventType() != XmlPullParser.START_TAG) {

            continue;

        }

        String name = parser.getName();

        if (name.equals("ad")) {

            extras.add(readExtraData(parser));

        } else {

            skip(parser);

        }

    }

    return extras;

}



private static AdEntry readEntry(XmlPullParser parser) throws XmlPullParserException, IOException {

    parser.require(XmlPullParser.START_TAG, ns, "ad");

    String productName = null;

    String productThumbnail = null;

    String rating = null;



    while (parser.next() != XmlPullParser.END_TAG) {

        if (parser.getEventType() != XmlPullParser.START_TAG)

            continue;



        String name = parser.getName();

        switch (name) {

            case "productName":

                productName = readNameProduct(parser);

                System.out.println("productName" + productName);

                break;

            case "productThumbnail":

                productThumbnail = readThumbnail(parser);

                System.out.println("productThumbnail" + productThumbnail);

                break;

            case "rating":

                rating = readRating(parser);

                System.out.println("rating" + rating);

                break;

            default:

                skip(parser);

                break;

        }

    }

    return new AdEntry(productName, productThumbnail, rating);

}



private static AdEntry readExtraData(XmlPullParser parser) throws XmlPullParserException, IOException {

    parser.require(XmlPullParser.START_TAG, ns, "ad");

    String averageRatingImageURL = null;

    String numberOfRatings = null;

    String categoryName = null;

    String appId = null;

    String productDescription = null;

    String clickProxyURL = null;



    while (parser.next() != XmlPullParser.END_TAG) {

        if (parser.getEventType() != XmlPullParser.START_TAG)

            continue;



        String name = parser.getName();

        if (name.equals("averageRatingImageURL")) {

            averageRatingImageURL = readRating(parser);

            System.out.println("rating" + averageRatingImageURL);

        } else if (name.equals("numberOfRatings")) {

            numberOfRatings = readNumberOfRatings(parser);

            System.out.println("numberOfRatings" + numberOfRatings);

        } else if (name.equals("categoryName")) {

            categoryName = readCategoryName(parser);

            System.out.println("categoryName" + categoryName);

        } else if (name.equals("appId")) {

            appId = readAppId(parser);

            System.out.println("appId" + appId);

        } else if (name.equals("productDescription")) {

            productDescription = readProductDescription(parser);

            System.out.println("productDescription" + productDescription);

        } else if (name.equals("clickProxyURL")) {

            productDescription = readProxyLink(parser);

            System.out.println("clickProxyURL" + clickProxyURL);

        } else

            skip(parser);

    }



    return new AdEntry(averageRatingImageURL, productDescription, categoryName, numberOfRatings, appId, clickProxyURL);

}



private static String readProxyLink(XmlPullParser parser) throws IOException, XmlPullParserException {

    parser.require(XmlPullParser.START_TAG, ns, "clickProxyURL");

    String clickProxyURL = readText(parser);

    parser.require(XmlPullParser.END_TAG, ns, "clickProxyURL");

    return clickProxyURL;

}



private static String readProductDescription(XmlPullParser parser) throws IOException, XmlPullParserException {

    parser.require(XmlPullParser.START_TAG, ns, "productDescription");

    String productDescription = readText(parser);

    parser.require(XmlPullParser.END_TAG, ns, "productDescription");

    return productDescription;

}



private static String readAppId(XmlPullParser parser) throws IOException, XmlPullParserException {

    parser.require(XmlPullParser.START_TAG, ns, "appId");

    String appId = readText(parser);

    parser.require(XmlPullParser.END_TAG, ns, "appId");

    return appId;

}





private static String readNameProduct(XmlPullParser parser) throws IOException, XmlPullParserException {

    parser.require(XmlPullParser.START_TAG, ns, "productName");

    String productName = readText(parser);

    parser.require(XmlPullParser.END_TAG, ns, "productName");

    return productName;

}



private static String readThumbnail(XmlPullParser parser) throws IOException, XmlPullParserException {

    parser.require(XmlPullParser.START_TAG, ns, "productThumbnail");

    String productThumbnail = readText(parser);

    parser.require(XmlPullParser.END_TAG, ns, "productThumbnail");

    return productThumbnail;

}



private static String readNumberOfRatings(XmlPullParser parser) throws IOException, XmlPullParserException {

    parser.require(XmlPullParser.START_TAG, ns, "numberOfRatings");

    String numberOfRatings = readText(parser);

    parser.require(XmlPullParser.END_TAG, ns, "numberOfRatings");

    return numberOfRatings;

}



private static String readCategoryName(XmlPullParser parser) throws IOException, XmlPullParserException {

    parser.require(XmlPullParser.START_TAG, ns, "categoryName");

    String numberOfRatings = readText(parser);

    parser.require(XmlPullParser.END_TAG, ns, "categoryName");

    return numberOfRatings;

}





private static String readRating(XmlPullParser parser) throws IOException, XmlPullParserException {

    parser.require(XmlPullParser.START_TAG, ns, "rating");

    String rating = readText(parser);

    parser.require(XmlPullParser.END_TAG, ns, "rating");

    return rating;

}



private static String readText(XmlPullParser parser) throws IOException, XmlPullParserException {

    String result = "";

    if (parser.next() == XmlPullParser.TEXT) {

        result = parser.getText();

        parser.nextTag();

    }



    return result;

}



private static void skip(XmlPullParser parser) throws XmlPullParserException, IOException {

    if (parser.getEventType() != XmlPullParser.START_TAG)

        throw new IllegalStateException();



    int depth = 1;

    while (depth != 0) {

        switch (parser.next()) {

            case XmlPullParser.END_TAG:

                depth--;

                break;

            case XmlPullParser.START_TAG:

                depth++;

                break;

        }

    }

}

}

Here is my Adapter:

public class AdsAdapter extends RecyclerView.Adapter<AdsAdapter.AdsAdapterViewHolder> {



final private AdsAdapterOnClickHandler mClickHandler;

public TextView thumbnail_textView;

public TextView name_textView;

public TextView rating_textView;

private List<AdEntry> mAdData;





public AdsAdapter(AdsAdapterOnClickHandler clickHandler) {

    mClickHandler = clickHandler;

}



@Override

public AdsAdapterViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {

    Context context = viewGroup.getContext();

    int layoutIdForListItem = R.layout.ad_list_item;

    LayoutInflater inflater = LayoutInflater.from(context);

    boolean shouldAttachToParentImmediately = false;



    View view = inflater.inflate(layoutIdForListItem, viewGroup, shouldAttachToParentImmediately);

    return new AdsAdapterViewHolder(view);

}



@Override

public void onBindViewHolder(AdsAdapterViewHolder adsAdapterViewHolder, int position) {

    AdEntry ad_item = mAdData.get(position);



    String thumbnail = ad_item.getProductThumbnail();

    name_textView.setText(thumbnail);



    String productName = ad_item.getProductName();

    thumbnail_textView.setText(productName);



    String productRating = ad_item.getProductRating();

    rating_textView.setText(productRating);



}



@Override

public int getItemCount() {

    if (null == mAdData) return 0;

    return mAdData.size();

}



public void setAdData(List<AdEntry> adData) {

    mAdData = adData;

    System.out.println("mAdData Result" + mAdData);

    notifyDataSetChanged();

}



public interface AdsAdapterOnClickHandler {

    void onClick(AdEntry ad);

}



public class AdsAdapterViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {



    public AdsAdapterViewHolder(View view) {

        super(view);



        thumbnail_textView = (TextView) view.findViewById(R.id.detail_product_thumbnail);

        name_textView = (TextView)view.findViewById(R.id.product_name);

        rating_textView = (TextView)view.findViewById(R.id.product_rating);





        view.setOnClickListener(this);

    }



    @Override

    public void onClick(View v) {

        int adapterPosition = getAdapterPosition();

        AdEntry ad = mAdData.get(adapterPosition);

        mClickHandler.onClick(ad);

    }

}

}

Here is the XML Document I am trying to parse:

<ad>

<appId>com.zynga.ozmatch</appId>

<averageRatingImageURL>

https://cdn1.appia.com/cdn/adpub/appwallv1/rated-5-5.png

</averageRatingImageURL>

<bidRate>0.000</bidRate>

<billingTypeId>1</billingTypeId>

<callToAction>Install Now</callToAction>

<campaignDisplayOrder>1</campaignDisplayOrder>

<campaignId>24058</campaignId>

<campaignTypeId>2</campaignTypeId>

<categoryName>Puzzle</categoryName>

<clickProxyURL>

http://prlds.appia.com/v2/preloadAd.jsp?siteId=10777&deviceId=4230&spotId=&sessionId=techtestsession&campaignId=24058&creativeId=483970&packageName=com.zynga.ozmatch&fulfillmentTypeId=1&placementId=&campaignDisplayOrder=1&enc=true&ts=1680f0e88d8&algorithmId=-4&partner=154&homeScreen=false

</clickProxyURL>

<creativeId>483970</creativeId>

<homeScreen>false</homeScreen>

<impressionTrackingURL>

https://imps.appia.com/v2/impressionAd.jsp?siteId=10777&campaignId=24058&creativeId=483970&campaignDisplayOrder=1&ts=1680f0e88d8&sessionId=techtestsession&packageName=com.zynga.ozmatch&enc=true&eventGroupId=EVTGID1546440837284181712958668&algorithmId=-4&partner=154

</impressionTrackingURL>

<isRandomPick>false</isRandomPick>

<numberOfRatings>10,000+</numberOfRatings>

<productDescription>

Match your way to meet the wonderful Wizard of Oz in this amazing puzzle adventure!

</productDescription>

<productId>15338</productId>

<productName>Wizard of Oz: Magic Match</productName>

<productThumbnail>

https://prod-static-images.s3.amazonaws.com/shared/creatives/15338/1385be772f424a3cb42cd8f07747b05b.png

</productThumbnail>

<rating>5.0</rating>

</ad>

Here is my model Class:

public class AdEntry {



    public String productThumbnail;

    public String productName;

    public String productRating ;

    public String productDescription;

    public String productCategory;

    public String numberOfRatings;

    public  String appId;

    public String proxyLink;

    public String averageRatingImageURL;



    public AdEntry(String productThumbnail, String productName, String productRating) {

        this.productThumbnail = productThumbnail;

        this.productName = productName;

        this.productRating = productRating;

    }



    public AdEntry(String productRating, String productDescription, String productCategory, String numberOfRatings, String appId, String proxyLink){

        this.productRating = productRating;

        this.productDescription = productDescription;

        this.productCategory = productCategory;

        this.numberOfRatings = numberOfRatings;

        this.appId = appId;

        this.proxyLink = proxyLink;

    }

public String getProductThumbnail() {

        return productThumbnail;

    }



    public String getProductName() {

        return productName;

    }



    public String getProductRating() {

        return productRating;

    }



    public String getProductDescription() {

        return productDescription;

    }



    public String getProductCategory() {

        return productCategory;

    }



    public String getNumberOfRatings() {

        return numberOfRatings;

    }



    public String getAppId() {

        return appId;

    }



    public String getProxyLink() {

        return proxyLink;

    }



    public String getAverageRatingImageURL() {

        return averageRatingImageURL;

    }

}

Here is the DetailActivity:

public class DetailActivity extends AppCompatActivity {



    private static List<AdEntry> entries = new ArrayList<>();

    public TextView description_textView;

    public TextView category_textView;

    public TextView rating_textView;

    public TextView link_textView;

    public TextView numberOfRating_textView;

    public TextView name_textView;

    public TextView thumbnail_textView;



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_detail);





        name_textView = (TextView)findViewById(R.id.detail_product_name);

        thumbnail_textView = (TextView)findViewById(R.id.detail_product_thumbnail);



        retrieveData();

    }



    public void retrieveData() {

        String productName =  getIntent().getStringExtra("Product Name");

        String productThumbnail = getIntent().getStringExtra("Product Thumbnail");

        System.out.println("productThumbnail Result" + productThumbnail);

        thumbnail_textView.setText(productThumbnail);

        name_textView.setText(productName);



    }