我有一个非常大的问题。我有一个应用程序从博客中提取和解析RSS提要，但我不知道如何将结果放入我的小部件。
这是RSSListActivity，它在自己的活动中正确显示了RSS：
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
RSSItem data = itemlist.get(position);
Intent intent = new Intent(Intent.ACTION_VIEW,Uri.parse(data.link));
startActivity(intent);
}
private void retrieveRSSFeed(String urlToRssFeed,ArrayList<RSSItem> list)
{
try
{
URL url = new URL(urlToRssFeed);
SAXParserFactory factory = SAXParserFactory.newInstance();
SAXParser parser = factory.newSAXParser();
XMLReader xmlreader = parser.getXMLReader();
RSSParser theRssHandler = new RSSParser(list);
xmlreader.setContentHandler(theRssHandler);
InputSource is = new InputSource(url.openStream());
xmlreader.parse(is);
}
catch (Exception e)
{
e.printStackTrace();
}
}
private class RetrieveRSSFeeds extends AsyncTask<Void, Void, Void>
{
private ProgressDialog progress = null;
@Override
protected Void doInBackground(Void... params) {
retrieveRSSFeed("http://blog.qubiz.com/index.php/feed",itemlist);
rssadaptor = new RSSListAdaptor(RSSListActivity.this, R.layout.rssitemview,itemlist);
return null;
}
@Override
protected void onCancelled() {
super.onCancelled();
}
@Override
protected void onPreExecute() {
progress = ProgressDialog.show(
RSSListActivity.this, null, "Loading RSS Feed... Please wait");
super.onPreExecute();
}
@Override
protected void onPostExecute(Void result) {
setListAdapter(rssadaptor);
progress.dismiss();
super.onPostExecute(result);
}
@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
}
private class RSSListAdaptor extends ArrayAdapter<RSSItem>{
private List<RSSItem> objects = null;
public RSSListAdaptor(Context context, int textviewid, List<RSSItem> objects) {
super(context, textviewid, objects);
this.objects = objects;
}
@Override
public int getCount() {
return ((null != objects) ? objects.size() : 0);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public RSSItem getItem(int position) {
return ((null != objects) ? objects.get(position) : null);
}
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
if(null == view)
{
LayoutInflater vi = (LayoutInflater)RSSListActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = vi.inflate(R.layout.rssitemview, null);
}
RSSItem data = objects.get(position);
if(null != data)
{
TextView title = (TextView)view.findViewById(R.id.txtTitle);
TextView date = (TextView)view.findViewById(R.id.txtDate);
TextView description = (TextView)view.findViewById(R.id.txtDescription);
title.setText(data.title);
date.setText("on " + data.date);
String prova = android.text.Html.fromHtml(data.description).toString();
//description.setText(data.description);
description.setText(prova);
}
return view;
}
}
public boolean onCreateOptionsMenu(Menu menu)
{
menu.add(1,1,0,"About");
return true;
}
public boolean onOptionsItemSelected(MenuItem item)
{
switch(item.getItemId())
{
case 1:
AlertDialog.Builder conferma_canc = new AlertDialog.Builder(this);
conferma_canc.setTitle("About");
conferma_canc.setMessage("Copyright © 2012 Qubiz. All rights reserved. Android version designed and developed by Csosz Gergo Levente, Qubiz Romania.");
conferma_canc.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
}
});
AlertDialog alert = conferma_canc.create();
alert.show();
return true;
}
return false;
}
这里是我的RSS解析器，它也可以正常工作：
public class RSSParser extends DefaultHandler {
private final static String TAG_ITEM = "item";
private final static String[] xmltags = { "title", "link", "pubDate", "description" };
private RSSItem currentitem = null;
private ArrayList<RSSItem> itemarray = null;
private int currentindex = -1;
private boolean isParsing = false;
private StringBuilder builder = new StringBuilder();
public RSSParser(ArrayList<RSSItem> itemarray) {
super();
this.itemarray = itemarray;
}
@Override
public void characters(char[] ch, int start, int length) throws SAXException {
super.characters(ch, start, length);
if(isParsing && -1 != currentindex && null != builder)
{
builder.append(ch,start,length);
}
}
@Override
public void startElement(String uri, String localName, String qName,Attributes attributes) throws SAXException {
super.startElement(uri, localName, qName, attributes);
if(localName.equalsIgnoreCase(TAG_ITEM))
{
currentitem = new RSSItem();
currentindex = -1;
isParsing = true;
itemarray.add(currentitem);
}
else
{
currentindex = itemIndexFromString(localName);
builder = null;
if(-1 != currentindex)
builder = new StringBuilder();
}
}
@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
super.endElement(uri, localName, qName);
if(localName.equalsIgnoreCase(TAG_ITEM))
{
isParsing = false;
}
else if(currentindex != -1)
{
if(isParsing)
{
switch(currentindex)
{
case 0: currentitem.title = builder.toString(); break;
case 1: currentitem.link = builder.toString(); break;
case 2: currentitem.date = builder.toString(); break;
case 3: currentitem.description= builder.toString(); break;
}
}
}
}
private int itemIndexFromString(String tagname){
int itemindex = -1;
for(int index= 0; index<xmltags.length; ++index)
{
if(tagname.equalsIgnoreCase(xmltags[index]))
{
itemindex = index;
break;
}
}
return itemindex;
}
}
我的ExampleAppWidgetProvider.java其中是一个示例时钟小部件代码，我想替换它以显示我的RSS提要。
public class ExampleAppWidgetProvider extends AppWidgetProvider {
static DateFormat df = new SimpleDateFormat("hh:mm:ss");
private static final String LOG_TAG = "ExampleWidget";
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds) {
final int N = appWidgetIds.length;
Log.i("ExampleWidget", "Updating widgets " + Arrays.asList(appWidgetIds));
for (int i = 0; i < N; i++) {
int appWidgetId = appWidgetIds[i];
Intent intent = new Intent(context, ExampleAppWidgetProvider.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget1);
views.setOnClickPendingIntent(R.id.button, pendingIntent);
views.setTextViewText(R.id.widget1label, df.format(new Date()));
appWidgetManager.updateAppWidget(appWidgetId, views);
}
}
private PendingIntent createClockTickIntent(Context context) {
Intent intent = new Intent(CLOCK_WIDGET_UPDATE);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
return pendingIntent;
}
@Override
public void onEnabled(Context context) {
super.onEnabled(context);
Log.d(LOG_TAG, "Widget Provider enabled. Starting timer to update widget every second");
AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.add(Calendar.SECOND, 1);
alarmManager.setRepeating(AlarmManager.RTC, calendar.getTimeInMillis(),1000, createClockTickIntent(context));
}
@Override
public void onDisabled(Context context) {
super.onDisabled(context);
Log.d(LOG_TAG, "Widget Provider disabled. Turning off timer");
AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
alarmManager.cancel(createClockTickIntent(context));
}
public static String CLOCK_WIDGET_UPDATE = "com.eightbitcloud.example.widget.8BITCLOCK_WIDGET_UPDATE";
@Override
public void onReceive(Context context, Intent intent) {
super.onReceive(context, intent);
Log.d(LOG_TAG, "Received intent " + intent);
if (CLOCK_WIDGET_UPDATE.equals(intent.getAction())) {
Log.d(LOG_TAG, "Clock update");
ComponentName thisAppWidget = new ComponentName(context.getPackageName(), getClass().getName());
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
int ids[] = appWidgetManager.getAppWidgetIds(thisAppWidget);
for (int appWidgetID : ids) {updateAppWidget(context, appWidgetManager, appWidgetID);
}
}
}
public static void updateAppWidget(Context context,AppWidgetManager appWidgetManager, int appWidgetId) {
String currentTime = df.format(new Date());
RemoteViews updateViews = new RemoteViews(context.getPackageName(),R.layout.widget1);
updateViews.setTextViewText(R.id.widget1label, currentTime);
appWidgetManager.updateAppWidget(appWidgetId, updateViews);
}
}
any1能为我提供解决方案吗？ 我的目标是：用我的rss feed阅读器替换widget的clock java代码。 所以我想在窗口小部件中显示rss解析器解析的最后一个rss项。我怎样才能做到这一点？ 请提供代码，不仅仅是一些想法，我对android开发有点新。 提前谢谢你的帮助！
答案 0 :(得分：1)
（假设你有正确的RSS检索和解析） 您只需更改小部件中的一些文本：
AppWidgetManager manager = AppWidgetManager.getInstance(context);
RemoteViews views = new RemoteViews(context.getPackageName(), R.name_of_your_widget_layout);
// set text of some view
views.setTextViewText(R.id.widget_amount_cameras, amountCameras);
// and of another view
views.setTextViewText(R.id.widget_location, locationCity);
// ... and yet another view
views.setTextViewText(R.id.locationStatus, locationStatus);
// get IDs of widgets , there could be more than one
final int[] appWidgetIds = manager.getAppWidgetIds(new ComponentName(YOurWidgetProviderClass.class.getPackage().getName(), YOurWidgetProviderClass.class.getName()));
// update all hte instances
manager.updateAppWidget(appWidgetIds, views);
您只能更改小部件的某些属性（由于安全性限制） - 有关详细说明，请参阅RemoteViews的Javadoc