RSSフィードを読むためのアプリケーションを作成しようとしています。アプリを作成しましたが、フィードが読み込まれません。アプリを正しく動作させるために何を変更できるかを教えていただけるように、コードを提供します。何が問題なのかわかりません。コードにエラーはありませんが、フィードは読み込まれません。
ListActivity.java：
package com.listview;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
public class ListActivity extends Activity {
ListView lv1;
ProgressDialog ShowProgress;
public ArrayList<Post> PostList = new ArrayList<Post>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list);
lv1 = (ListView)findViewById(R.id.listView1);
ShowProgress = ProgressDialog.show(ListActivity.this,"","Loading. Please wait...",true);
new loadingTask().execute("av-gurus.blogspot.com/feeds/posts/default/");
lv1.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent,View view,
int position, long id){
Intent intent = new Intent(Intent.ACTION_VIEW).setData(Uri
.parse(PostList.get(position).getUrl()));
startActivity(intent);
}
});
}
class loadingTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
SAXHelper sh = null;
try
{
sh = new SAXHelper(urls[0]);
}catch (MalformedURLException e){
e.printStackTrace();
}
sh.parseContent("");
return "";
}
protected void onPostExecute(String s) {
lv1.setAdapter(new EfficientAdapter(ListActivity.this, PostList));
ShowProgress.dismiss();
}
}
class SAXHelper{
public HashMap<String, String> userList = new HashMap<String, String>();
private URL url2;
public SAXHelper(String url1) throws MalformedURLException {
this.url2 = new URL(url1);
}
public RSSHandler parseContent(String parseContent) {
RSSHandler df = new RSSHandler();
try {
SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser sp = spf.newSAXParser();
XMLReader xr = sp.getXMLReader();
xr.setContentHandler(df);
xr.parse(new InputSource(url2.openStream()));
} catch (Exception e) {
e.printStackTrace();
}
return df;
}
}
class RSSHandler extends DefaultHandler {
private Post currentPost = new Post();
StringBuffer chars = new StringBuffer();
@Override
public void startElement(String uri, String localName, String qName,
Attributes atts) {
chars = new StringBuffer();
if (localName.equalsIgnoreCase("item")) {
}
}
@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
if (localName.equalsIgnoreCase("title")
&& currentPost.getTitle() == null) {
currentPost.setTitle(chars.toString());
}
if (localName.equalsIgnoreCase("pubDate")
&& currentPost.getPubDate() == null) {
currentPost.setPubDate(chars.toString());
}
if (localName.equalsIgnoreCase("thumbnail")
&& currentPost.getThumbnail() == null) {
currentPost.setThumbnail(chars.toString());
}
if (localName.equalsIgnoreCase("link")
&& currentPost.getUrl() == null) {
currentPost.setUrl(chars.toString());
}
if (localName.equalsIgnoreCase("item")) {
PostList.add(currentPost);
currentPost = new Post();
}
}
@Override
public void characters(char ch[], int start, int length) {
chars.append(new String(ch, start, length));
}
}
}
Post.java：
package com.listview;
public class Post {
private String title;
private String thumbnail;
private String url;
private String description;
private String pubDate;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getThumbnail() {
return thumbnail;
}
public void setThumbnail(String thumbnail) {
this.thumbnail = thumbnail;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public void setDescription(String description) {
this.description = description;
}
public String getDescription() {
return description;
}
public void setPubDate(String pubDate) {
this.pubDate = pubDate;
}
public String getPubDate() {
return pubDate;
}
}
EfficientAdapter.java：
package com.listview;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.Drawable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class EfficientAdapter extends BaseAdapter {
private Activity activity;
private ArrayList<Post> data;
private static LayoutInflater inflater = null;
//public ImageLoader imageLoader;
ViewHolder holder;
EfficientAdapter(Activity a, ArrayList<Post> d) {
activity = a;
data = d;
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
// imageLoader = new ImageLoader(activity.getApplicationContext());
}
@Override
public int getCount() {
return data.toArray().length;
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
public static class ViewHolder {
public TextView label;
public TextView addr;
public ImageView image;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View vi = convertView;
if (convertView == null) {
vi = inflater.inflate(R.layout.row, null);
holder = new ViewHolder();
holder.label = (TextView) vi.findViewById(R.id.title);
holder.addr = (TextView) vi.findViewById(R.id.details);
holder.image = (ImageView) vi.findViewById(R.id.thumb);
vi.setTag(holder);
} else
holder = (ViewHolder) vi.getTag();
holder.label.setText(data.get(position).getTitle());
holder.addr.setText(data.get(position).getPubDate());
imageLoader.DisplayImage((data.get(position).getThumbnail()), activity,
holder.image, 72, 72);
URL url = null;
try {
url = new URL((data.get(position).getThumbnail()));
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
InputStream content = null;
try {
content = (InputStream)url.getContent();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Drawable d = Drawable.createFromStream(content , "src");
Bitmap mIcon1 = null;
try {
mIcon1 =
BitmapFactory.decodeStream(url.openConnection().getInputStream());
} catch (IOException e) {
e.printStackTrace();
}
holder.image.setImageBitmap(Bitmap.createScaledBitmap(mIcon1, 72, 72, false));
return vi;
}
}
activity_list.xml：
<LinearLayout 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=".ListActivity" >
<ListView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scrollingCache="false"
android:background="#ffffff"
android:cacheColorHint="#00000000"
android:id="@+id/listView1">
</ListView>
</LinearLayout>
row.xml：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout android:id="@+id/widget30"
android:layout_width="fill_parent" android:layout_height="wrap_content"
android:padding="4dip" xmlns:android="http://schemas.android.com/apk/res/android">
<TextView android:id="@+id/details" android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="TextView"
android:textColor="#000000" android:layout_toRightOf="@+id/icon"
android:layout_alignLeft="@+id/title" android:layout_alignRight="@+id/title"
android:layout_below="@+id/title" android:layout_marginRight="5px">
</TextView>
<TextView android:id="@+id/title" android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="TextView"
android:textStyle="bold" android:textColor="#000000"
android:layout_marginTop="5px" android:layout_toRightOf="@+id/icon"
android:layout_marginRight="5px">
</TextView>
<ImageView android:id="@+id/arrow" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:padding="0px"
android:layout_marginRight="10px" android:src="@drawable/ic_launcher"
android:layout_alignRight="@+id/icon" android:layout_alignParentRight="true"
android:layout_centerVertical="true">
</ImageView>
<ImageView android:id="@+id/thumb" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_marginRight="10px"
android:layout_centerVertical="true" android:layout_alignParentLeft="true"
android:src="@drawable/ic_launcher" android:minWidth="72dip"
android:minHeight="72dip" android:maxWidth="72dip" android:maxHeight="72dip">
</ImageView>
</RelativeLayout>