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我正在尋找一種同時完成多個HTTP連接的最佳方法。我的應用程序從25個不同的來源提取RSS提要，目前我只有一個HTTP連接，這顯然需要一點時間才能通過所有的URL。我使用ASyncTask工作，每次下載和解析RSS文檔時，我都會更新我的SQLite數據庫，並向它添加提要。在Android上使用HTTPClient完成多個HTTP連接的最佳方法
private class FeedFetcherTask extends AsyncTask<String, Void, Integer> {
private Context context;
private String[] pcFeedUrls;
private String[] xboxFeedUrls;
private String[] playstationFeedUrls;
private String[] nintendoFeedUrls;
private String[] mobileFeedUrls;
private ArrayList<NewsFeed> newFeeds;
public FeedFetcherTask(Context c) {
context = c;
pcFeedUrls = c.getResources().getStringArray(R.array.pc_feeds);
xboxFeedUrls = c.getResources().getStringArray(R.array.xbox_feeds);
playstationFeedUrls = c.getResources().getStringArray(R.array.playstation_feeds);
nintendoFeedUrls = c.getResources().getStringArray(R.array.nintendo_feeds);
mobileFeedUrls = c.getResources().getStringArray(R.array.mobile_feeds);
newFeeds = new ArrayList<NewsFeed>();
}
@Override
protected Integer doInBackground(String... params) {
long time = System.currentTimeMillis();
//getActivity().setProgressBarIndeterminateVisibility(true);
getNewsForPc();
getNewsForXbox();
getNewsForPlaystation();
getNewsForNintendo();
getNewsForMobile();
newRowsInserted = storeNewsInDatabase();
long finish = System.currentTimeMillis() - time;
Log.i("time elapsed", finish/1000.0 + "");
return null;
}
@Override
protected void onPostExecute(Integer count) {
super.onPostExecute(count);
if (getActivity() != null) {
getActivity().setProgressBarIndeterminateVisibility(false);
if (newRowsInserted == 0) {
Toast.makeText(getActivity().getApplicationContext(), getResources().getString(R.string.no_new_tweets), Toast.LENGTH_SHORT).show();
} else {
newFeedsButton.setVisibility(Button.VISIBLE);
buttonVisible = Button.VISIBLE;
newFeedsButton.setText(getResources().getQuantityString(R.plurals.new_feeds_plurals, newRowsInserted, newRowsInserted));
//TODO Create animation
}
}
else{
buttonVisible = Button.VISIBLE;
}
}
@Override
protected void onCancelled() {
super.onCancelled();
}
private void retainListViewPosition() {
int index = listView.getFirstVisiblePosition() + newFeeds.size();
View v = listView.getChildAt(0);
int top = (v == null) ? 0 : v.getTop();
listView.setSelectionFromTop(index, top);
}
private void getNewsForPc() {
int platform = NewsFeed.PLATFORM_PC;
for (String url : pcFeedUrls) {
parseRssFeed(url, platform);
}
}
private void getNewsForXbox() {
int platform = NewsFeed.PLATFORM_XBOX;
for (String url : xboxFeedUrls) {
parseRssFeed(url, platform);
}
}
private void getNewsForPlaystation() {
int platform = NewsFeed.PLATFORM_PLAYSTATION;
for (String url : playstationFeedUrls) {
parseRssFeed(url, platform);
}
}
private void getNewsForNintendo() {
int platform = NewsFeed.PLATFORM_NINTENDO;
for (String url : nintendoFeedUrls) {
parseRssFeed(url, platform);
}
}
private void getNewsForMobile() {
int platform = NewsFeed.PLATFORM_MOBILE;
for (String url : mobileFeedUrls) {
parseRssFeed(url, platform);
}
}
private void parseRssFeed(String urlIn, int platformIn) {
//TODO Too many GC, also need to close streams
try {
HttpClient apacheClient = new DefaultHttpClient();
HttpResponse response = apacheClient.execute(new HttpGet(urlIn));
BufferedReader br = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
InputSource is = new InputSource(br);
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse(is);
NodeList nodeList = document.getElementsByTagName("item");
String provider = document.getElementsByTagName("title").item(0).getTextContent();
int platform = platformIn;
Node node;
NewsFeed feed = null;
String title;
String link;
String description;
NodeList guidNodeList;
String guid;
String pubDate;
NodeList creatorNodeList;
String creator;
Element element;
for (int i = 0; i < nodeList.getLength(); i++) {
node = nodeList.item(i);
if (node.getNodeType() == Node.ELEMENT_NODE) {
element = (Element) node;
feed = new NewsFeed();
title = element.getElementsByTagName("title").item(0).getTextContent();
feed.setTitle(title);
link = element.getElementsByTagName("link").item(0).getTextContent();
feed.setLink(link);
description = element.getElementsByTagName("description").item(0).getTextContent();
feed.setDescription(description);
guidNodeList = element.getElementsByTagName("guid");
if (guidNodeList == null | guidNodeList.getLength() < 1) {
feed.setGuid(link);
} else {
guid = guidNodeList.item(0).getTextContent();
feed.setGuid(guid);
}
pubDate = element.getElementsByTagName("pubDate").item(0).getTextContent();
feed.setDate(pubDate);
creatorNodeList = element.getElementsByTagName("dc:creator");
if (creatorNodeList == null | creatorNodeList.getLength() < 1) {
feed.setCreator(provider);
} else {
creator = creatorNodeList.item(0).getTextContent();
feed.setCreator(creator);
}
feed.setProvider(provider);
feed.setPlatform(platform);
newFeeds.add(feed);
}
}
} catch (ConnectException ce) {
Toast.makeText(getActivity(), getActivity().getResources().getString(R.string.connection_exception_error), Toast.LENGTH_SHORT).show();
} catch (UnknownHostException uhe) {
uhe.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
private int storeNewsInDatabase() {
return dao.insertAllFeeds(newFeeds);
}
}
我相信這可能是最低效率的方法。我將不勝感激任何有關如何處理此任務的建議。我已經看過ExecutorService，但不知道這是否是正確的方式。