我正在为我在大学的最后一年项目创建一个应用程序..我正在尝试让RSS工作正常工作..我现在的问题是我创建了一个项目（RSSActivity）并让RSS源工作。然后我将所有文件（5个类和2个布局）复制并粘贴到适当的位置。有一些错误：找不到R，但是通过将包更改为项目（football_app）可以很容易地解决这个问题。我要做的是能够点击一个名为“新闻”的按钮，然后出现新闻..我遇到的问题是，当我现在点击“新闻”按钮时，它会说'不幸的足球应用已停止'..我已经尝试了意图中的每一个类，并且适当地更改了意图活动名称..任何人都可以帮助我..下面的代码......
/////////////// HttpFeedSource.java
package com.julian.football_app;
import java.util.ArrayList;
import java.util.List;
class HttpFeedSource implements FeedSource {
protected static final String URL = "http://www.skysports.com/rss/0,20514,11661,00.xml";
public List<RSSItem> getFeed() {
List<RSSItem> itemList = new ArrayList<RSSItem>();
NewsParser parser = new NewsParser(URL);
parser.parse();
NewsParser.RssFeed feed = parser.getFeed();
for (NewsParser.Item i : feed.getItems()) {
itemList.add(new RSSItem(i.getUrl(), i.getTitle(), i.getDescription(), i.getimageUrl()));
}
return itemList;
}
}
////////////////////// FeedSource.java
package com.julian.football_app;
import java.util.List;
interface FeedSource {
List<RSSItem> getFeed();
}
<code>
/////////////////////////////////////////////// //////////////////////////////////////////// //MockFeedSource.java < / p>
包com.julian.football_app;
import java.util.ArrayList; import java.util.List;
类MockFeedSource实现FeedSource {
public List<RSSItem> getFeed() {
RSSItem item;
final List<RSSItem> items = new ArrayList<RSSItem>();
item = new RSSItem("Android Workshop er gøy", "http://www.ap.no", " this is the desc", "");
items.add(item);
item = new RSSItem("Android Workshop er gøy 2", "http://www.ap.no", "this is the desc", "");
items.add(item);
item = new RSSItem("Android Workshop er gøy3", "http://www.ap.no", "this is the desc", "");
items.add(item);
return items;
}
}
</code>
/////////////////////////////////////////////////////////////////////////////////////////// NewsParser.java
package com.julian.football_app;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.helpers.DefaultHandler;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import java.io.InputStream;
import java.net.URL;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Locale;
class NewsParser extends DefaultHandler {
public static SimpleDateFormat sdf = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.ENGLISH);
private String urlString;
private RssFeed rssFeed;
private StringBuilder text;
private Item item;
private boolean imgStatus;
public NewsParser(String url) {
this.urlString = url;
this.text = new StringBuilder();
}
public void parse() {
InputStream urlInputStream = null;
SAXParserFactory spf;
SAXParser sp;
try {
URL url = new URL(this.urlString);
urlInputStream = url.openConnection().getInputStream();
InputSource is = new InputSource(urlInputStream);
is.setEncoding("ISO-8859-1");
spf = SAXParserFactory.newInstance();
if (spf != null) {
sp = spf.newSAXParser();
sp.parse(is, this);
}
} catch (Exception e) {
throw new RuntimeException(e);
} finally {
try {
if (urlInputStream != null) urlInputStream.close();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
public RssFeed getFeed() {
return (this.rssFeed);
}
public void startElement(String uri, String localName, String qName,
Attributes attributes) {
if (qName.equalsIgnoreCase("channel"))
this.rssFeed = new RssFeed();
else if (qName.equalsIgnoreCase("item") && (this.rssFeed != null)) {
this.item = new Item();
this.rssFeed.addItem(this.item);
} else if (qName.equalsIgnoreCase("image") && (this.rssFeed != null))
this.imgStatus = true;
}
public void endElement(String uri, String localName, String qName) {
if (this.rssFeed == null)
return;
if (qName.equalsIgnoreCase("item"))
this.item = null;
else if (qName.equalsIgnoreCase("image"))
this.imgStatus = false;
else if (qName.equalsIgnoreCase("title")) {
if (this.item != null) this.item.title = this.text.toString().trim();
else if (this.imgStatus) this.rssFeed.imageTitle = this.text.toString().trim();
else this.rssFeed.title = this.text.toString().trim();
} else if (qName.equalsIgnoreCase("link")) {
if (this.item != null) this.item.link = this.text.toString().trim();
else if (this.imgStatus) this.rssFeed.imageLink = this.text.toString().trim();
else this.rssFeed.link = this.text.toString().trim();
} else if (qName.equalsIgnoreCase("description")) {
if (this.item != null) this.item.description = this.text.toString().trim();
else this.rssFeed.description = this.text.toString().trim();
} else if (qName.equalsIgnoreCase("url") && this.imgStatus)
this.rssFeed.imageUrl = this.text.toString().trim();
else if (qName.equalsIgnoreCase("language"))
this.rssFeed.language = this.text.toString().trim();
else if (qName.equalsIgnoreCase("generator"))
this.rssFeed.generator = this.text.toString().trim();
else if (qName.equalsIgnoreCase("copyright"))
this.rssFeed.copyright = this.text.toString().trim();
else if (qName.equalsIgnoreCase("pubDate") && (this.item != null)) {
try {
this.item.pubDate = sdf.parse(this.text.toString().trim());
} catch (ParseException e) {
throw new RuntimeException();
}
} else if (qName.equalsIgnoreCase("category") && (this.item != null))
this.rssFeed.addItem(this.text.toString().trim(), this.item);
this.text.setLength(0);
}
public void characters(char[] ch, int start, int length) {
this.text.append(ch, start, length);
}
public static class RssFeed {
public String title;
public String description;
public String link;
public String language;
public String generator;
public String copyright;
public String imageUrl;
public String imageTitle;
public String imageLink;
private ArrayList<Item> items;
private HashMap<String, ArrayList<Item>> category;
public void addItem(Item item) {
if (this.items == null)
this.items = new ArrayList<Item>();
this.items.add(item);
}
public void addItem(String category, Item item) {
if (this.category == null)
this.category = new HashMap<String, ArrayList<Item>>();
if (!this.category.containsKey(category))
this.category.put(category, new ArrayList<Item>());
this.category.get(category).add(item);
}
public ArrayList<Item> getItems() {
return items;
}
}
public static class Item implements Comparable<Item> {
public String title;
public String description;
public String link;
public Date pubDate;
private String url;
private String imageUrl;
public String toString() {
return (this.title + ": ");
}
public int compareTo(Item o) {
return (int) (o.pubDate.getTime() - pubDate.getTime());
}
public Date getPubDate() {
return pubDate;
}
public String getDescription() {
return description;
}
public String getTitle() {
return title;
}
public String getUrl() {
return url;
}
public String getimageUrl() {
return imageUrl;
}
}
}
package com.julian.football_app;
import com.julian.football_app.R;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;
public class RSSActivity extends Activity {
/**
* Called when the activity is first created.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main2);
ListView rssItemList = (ListView) findViewById(R.id.rssListview);
FeedSource feedSource = new HttpFeedSource();
RSSItemAdapter adapter = new RSSItemAdapter(this, R.layout.rssitem, feedSource.getFeed());
rssItemList.setAdapter(adapter);
}
}
/////////RssItem
package com.julian.football_app;
import java.util.Date;
class RSSItem {
private String url;
private String title;
private String description;
private String imageUrl;
private Date pubDate;
public RSSItem() {
}
public RSSItem(String url, String title, String description, String imageUrl) {
this.url = url;
this.title = title;
this.description = description;
this.imageUrl = imageUrl;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDescription() {
return description;
}
public void setDesc(String description) {
this.description = description;
}
public void setImageUrl(String imageUrl) {
this.imageUrl = imageUrl;
}
public String getimageUrl() {
return imageUrl;
}
public void setpubDate(Date pubDate){
this.pubDate = pubDate;
}
public Date getpubDate(){
return pubDate;
}
}
////////////////// RssItemAdaptor
package com.julian.football_app;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import java.util.List;
import com.julian.football_app.R;
class RSSItemAdapter extends ArrayAdapter<RSSItem> {
private final Context context;
public RSSItemAdapter(Context context, int textViewResourceId,
List<RSSItem> items) {
super(context, textViewResourceId, items);
this.context = context;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater vi = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.rssitem, null);
}
final RSSItem item = getItem(position);
TextView title = (TextView) v.findViewById(R.id.title);
TextView desc = (TextView) v.findViewById(R.id.description);
TextView url = (TextView) v.findViewById(R.id.url);
// this is what is viewed
title.setText(item.getTitle());
desc.setText(item.getDescription());
url.setText(item.getimageUrl());
return v;
}
}
///This is the button i want to display the Rss Feed
package com.julian.football_app;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class Menu extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.menu);
//setting the buttons
Button btnews1 = (Button) findViewById(R.id.news_1);
btnews1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
Intent news1intent = new Intent(Menu.this, news_1.class);
Menu.this.startActivity(news1intent);
}
});
感谢您查看我的代码...如果有人可以帮助我，我将非常感激:)（我知道它在意图中说news_1.class ..它唯一因为我尝试了一切并回到原始状态..）
这些是LogCat中出现的错误：
03-23 13:54:16.118: E/AndroidRuntime(553): FATAL EXCEPTION: main
03-23 13:54:16.118: E/AndroidRuntime(553): at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1508)
03-23 13:54:16.118: E/AndroidRuntime(553): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1384)
03-23 13:54:16.118: E/AndroidRuntime(553): at android.app.Activity.startActivityForResult(Activity.java:3190)
03-23 13:54:16.118: E/AndroidRuntime(553): at android.app.Activity.startActivity(Activity.java:3297)
03-23 13:54:16.118: E/AndroidRuntime(553): at com.julian.football_app.Menu$1.onClick(Menu.java:24)
03-23 13:54:16.118: E/AndroidRuntime(553): at android.view.View.performClick(View.java:3460)
03-23 13:54:16.118: E/AndroidRuntime(553): at android.view.View$PerformClick.run(View.java:13955)
03-23 13:54:16.118: E/AndroidRuntime(553): at android.os.Handler.handleCallback(Handler.java:605)
03-23 13:54:16.118: E/AndroidRuntime(553): at android.os.Handler.dispatchMessage(Handler.java:92)
03-23 13:54:16.118: E/AndroidRuntime(553): at android.os.Looper.loop(Looper.java:137)
03-23 13:54:16.118: E/AndroidRuntime(553): at android.app.ActivityThread.main(ActivityThread.java:4340)
03-23 13:54:16.118: E/AndroidRuntime(553): at java.lang.reflect.Method.invokeNative(Native Method)
03-23 13:54:16.118: E/AndroidRuntime(553): at java.lang.reflect.Method.invoke(Method.java:511)
03-23 13:54:16.118: E/AndroidRuntime(553): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
03-23 13:54:16.118: E/AndroidRuntime(553): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
03-23 13:54:16.118: E/AndroidRuntime(553): at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：2)
听起来该应用正在遇到异常。要查找原因，您需要使用LogCat查看异常详细信息，这将显示代码中存在问题的位置。
答案 1 :(得分：0)
了解您的应用程序如何脱轨：
E/AndroidRuntime(553): at android.app.Activity.startActivity(Activity.java:3297) 03-23 13:54:16.118:
E/AndroidRuntime(553): at com.julian.football_app.Menu$1.onClick(Menu.java:24) 03-23 13:54:16.118:
我的感觉是，这根本不是关于RSS的。我认为您需要修复应用程序中的活动之间的Intent导航。您可以尝试阻止活动中的所有行为（注释掉onCreate()或其他有趣的部分），并确保您可以在活动之间平滑导航。然后重新启用活动并确保它们在您输入时不会爆炸。
另请参阅MH关于检查所有活动是否在您的清单中的评论。
然后拿出那句话说：
import com.julian.football_app.R;
如果您无法在不包含.R的情况下编译代码，那么您就会做错事。尝试保存所有源文件，删除gen目录的内容，然后选择Project > Clean。