Я пытаюсь сделать новостное приложение, данные получены из RSS-канала.Я получаю XML-ответ от канала.И я использую XmlPullParser для разбора XML.Разбор успешен.Я могу видеть значения в моем журнале.
Но почему-то я не могу заполнить их в своем обзоре.Это все просто пусто.Мой класс Java:
public class RssNewsActivity extends AppCompatActivity {
private static final String TAG = RssNewsActivity.class.toString();
RssFeedAdapter adapter;
RecyclerView recyclerView_rssFeed;
SwipeRefreshLayout swipeRefreshLayout;
private List<RssModel> listResponseModel;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_rss_news);
initialize();
recyclerView_rssFeed.setHasFixedSize(true);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
recyclerView_rssFeed.setLayoutManager(linearLayoutManager);
adapter = new RssFeedAdapter(RssNewsActivity.this, listResponseModel);
recyclerView_rssFeed.setAdapter(adapter);
fetchNewsFeed();
//if user swipes the recycler then refresh content page
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
fetchNewsFeed();
}
});
}
private void initialize() {
swipeRefreshLayout = findViewById(R.id.swipeRefresh_rssFeed);
recyclerView_rssFeed = findViewById(R.id.recyclerView_rssFeed);
listResponseModel = new ArrayList<>();
}
private void fetchNewsFeed() {
String url = "here is my news feed url";
StringRequest request = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
listResponseModel.clear();
try {
listResponseModel = parseNewsFeed(response);
} catch (XmlPullParserException | IOException e) {
Log.e(TAG, e.getMessage());
}
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
RequestQueue queue = Volley.newRequestQueue(this);
queue.add(request);
}
private List<RssModel> parseNewsFeed(String response) throws XmlPullParserException,
IOException {
XmlPullParserFactory parserFactory = XmlPullParserFactory.newInstance();
parserFactory.setNamespaceAware(true);
XmlPullParser xmlPullParser = parserFactory.newPullParser();
xmlPullParser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
xmlPullParser.setInput(new StringReader(response));
return processParsing(xmlPullParser);
}
private List<RssModel> processParsing(XmlPullParser xmlPullParser) throws IOException, XmlPullParserException {
List<RssModel> listRssFeed = new ArrayList<>();
int eventType = xmlPullParser.getEventType();
RssModel rssModel = null;
xmlPullParser.nextTag();
while (eventType != XmlPullParser.END_DOCUMENT) {
String eltName;
switch (eventType) {
case XmlPullParser.START_DOCUMENT:
break;
case XmlPullParser.START_TAG:
eltName = xmlPullParser.getName();
if ("item".equals(eltName)) {
rssModel = new RssModel();
} else if (rssModel != null) {
if ("title".equals(eltName)) {
String title = xmlPullParser.nextText();
rssModel.setTitle(title);
Log.d(TAG, "title: " + title);
} else if ("link".equals(eltName)) {
String link = xmlPullParser.nextText();
rssModel.setLink(link);
Log.d(TAG, "link: " + link);
}
}
break;
case XmlPullParser.END_TAG:
eltName = xmlPullParser.getName();
if ("item".equals(eltName) && rssModel != null) {
listRssFeed.add(rssModel);
}
break;
}
eventType = xmlPullParser.next();
}
return listRssFeed;
}
}
Мой дизайн XML:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="rssnewsfeed.RssNewsActivity">
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/swipeRefresh_rssFeed"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerView_rssFeed"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</android.support.v4.widget.SwipeRefreshLayout>
</RelativeLayout>
Это мой класс адаптера
public class RssFeedAdapter extends RecyclerView.Adapter<RssFeedAdapter.RssViewHolder> {
private Context mContext;
private List<RssModel> mRssFeeds;
public RssFeedAdapter(Context mContext, List<RssModel> mRssFeeds) {
this.mContext = mContext;
this.mRssFeeds = mRssFeeds;
}
@NonNull
@Override
public RssViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(mContext).inflate(R.layout.rss_feed_layout, viewGroup, false);
return new RssViewHolder(v);
}
@Override
public void onBindViewHolder(@NonNull RssViewHolder rssViewHolder, int i) {
RssModel post = mRssFeeds.get(i);
rssViewHolder.textView_title.setText(post.getTitle());
rssViewHolder.textView_link.setText(post.getLink());
}
@Override
public int getItemCount() {
return mRssFeeds.size();
}
public class RssViewHolder extends RecyclerView.ViewHolder {
private TextView textView_title, textView_link;
public RssViewHolder(@NonNull View itemView) {
super(itemView);
textView_title = itemView.findViewById(R.id.textView_title);
textView_link = itemView.findViewById(R.id.textView_link);
}
}
}
И, наконец, это мой класс модели:
public class RssModel {
private String title;
private String link;
public RssModel() {
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getLink() {
return link;
}
public void setLink(String link) {
this.link = link;
}
}
Я пробовал много способов, но безуспешно.Я не знаю, чего мне не хватает.Буду благодарен за любое руководство.Спасибо.