嗨，我是 android 的新手，现在正在开发一个应用程序来列出来自 RSS FEED 解析的一些日期，而所有其他工作正常的问题是我想将图像添加到列表视图项中。内容取自 RSS 提要。但 Rss 提要不包含任何图像。我需要将图像添加到列表视图中。而且所有列表项的图像都是相同的。
解析是使用 DefaultHandler 完成的...
这是我的列表项页面
public class MainActivity extends Activity {
// A reference to the local object
private MainActivity local;
/**
* This method creates main application view
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Set view
setContentView(R.layout.activity_main);
// Set reference to this activity
local = this;
GetRSSDataTask task = new GetRSSDataTask();
// Start download RSS task
task.execute("http://manna.christianchannel.us/feed/");
// Debug the thread name
Log.d("Reader", Thread.currentThread().getName());
}
private class GetRSSDataTask extends AsyncTask<String, Void, List<RssItem> > {
@Override
protected List<RssItem> doInBackground(String... urls) {
// Debug the task thread name
Log.d("Reader", Thread.currentThread().getName());
try {
// Create RSS reader
RssReader rssReader = new RssReader(urls[0]);
// Parse RSS, get items
return rssReader.getItems();
} catch (Exception e) {
Log.e("Reader", e.getMessage());
}
return null;
}
@Override
protected void onPostExecute(List<RssItem> result) {
// Get a ListView from main view
ListView itcItems = (ListView) findViewById(R.id.listMainView);
// Create a list adapter
ArrayAdapter<RssItem> adapter = new ArrayAdapter<RssItem>(local,android.R.layout.simple_list_item_1, result);
// Set list adapter for the ListView
itcItems.setAdapter(adapter);
// Set list view item click listener
itcItems.setOnItemClickListener(new ListListeners(result, local));
}
}
}
这是我的 RssParseHandler 页面
public class RssParseHandler extends DefaultHandler {
private List<RssItem> rssItems;
// Used to reference item while parsing
private RssItem currentItem;
// Parsing title indicator
private boolean parsingTitle;
// Parsing link indicator
private boolean parsingLink;
private boolean parsingDescription;
public RssParseHandler() {
rssItems = new ArrayList<RssItem>();
}
public List<RssItem> getItems() {
return rssItems;
}
@Override
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
if ("item".equals(qName)) {
currentItem = new RssItem();
} else if ("title".equals(qName)) {
parsingTitle = true;
} else if ("link".equals(qName)) {
parsingLink = true;
}else if ("description".equals(qName)) {
parsingDescription =true;
}
}
@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
if ("item".equals(qName)) {
rssItems.add(currentItem);
currentItem = null;
} else if ("title".equals(qName)) {
parsingTitle = false;
} else if ("link".equals(qName)) {
parsingLink = false;
} else if ("description".equals(qName)) {
parsingDescription=false;
}
}
@Override
public void characters(char[] ch, int start, int length) throws SAXException {
if (parsingTitle) {
if (currentItem != null)
currentItem.setTitle(new String(ch, start, length));
} else if (parsingLink) {
if (currentItem != null) {
currentItem.setLink(new String(ch, start, length));
parsingLink = false;
}
} else if (parsingDescription) {
if (currentItem !=null) {
currentItem.setDescription(new String(ch, start, length));
parsingDescription =false;
}
}
}
}
这是我的 RSS 项目页面
public class RssItem {
// item title
private String title;
// item link
private String link;
private String description;
private String icons;
public String getIcons() {
return icons;
}
public void setIcons(String icons) {
this.icons = icons;
}
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;
}
@Override
public String toString() {
return title;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
}