如果 RSS 提要（xml 文件）中存在任何新项目，我尝试编写一个代码来制作更新小部件（通知），因为我的应用程序是获取大学的新闻，一切都完成了，希望更新完成点击不在一段时间内！
更新小部件的快照：
更新服务代码（点击更新）：
package com.example.testfeeds;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Random;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;
import android.annotation.SuppressLint;
import android.app.PendingIntent;
import android.app.Service;
import android.appwidget.AppWidgetManager;
import android.content.ComponentName;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.os.IBinder;
import android.util.Log;
import android.webkit.WebView.FindListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.RemoteViews;
import android.widget.TextView;
public class UpdateWidgetService extends Service {
private static final String LOG = "testwidgets";
int numberOfItems=0;
ArrayList<String> feedsPubDate;
@SuppressWarnings("deprecation")
@Override
public void onStart(Intent intent, int startId) {
Log.i(LOG, "Called");
// Create some random data
feedsPubDate=new ArrayList<String>();
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(this
.getApplicationContext());
int[] allWidgetIds = intent
.getIntArrayExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS);
ComponentName thisWidget = new ComponentName(getApplicationContext(),
MyWidgetProvider.class);
int[] allWidgetIds2 = appWidgetManager.getAppWidgetIds(thisWidget);
Log.w(LOG, "From Intent" + String.valueOf(allWidgetIds.length));
Log.w(LOG, "Direct" + String.valueOf(allWidgetIds2.length));
for (int widgetId : allWidgetIds) {
///////////////////////////////////////////////////////////////////////////
RemoteViews remoteViews = new RemoteViews(this
.getApplicationContext().getPackageName(),
R.layout.widget_layout);
try {
numberOfItems=doTestFeed();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// Set the text
remoteViews.setTextColor(R.id.textView1,Color.WHITE);
remoteViews.setTextViewText(R.id.textView1," "+
String.valueOf(numberOfItems));
Log.w(LOG, String.valueOf(numberOfItems));
////////////////////////////////////////////////////////////////////////////
// Register an onClickListener
Intent clickIntent = new Intent(this.getApplicationContext(),
MyWidgetProvider.class);
clickIntent.setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
clickIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS,
allWidgetIds);
PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, clickIntent,
PendingIntent.FLAG_UPDATE_CURRENT);
remoteViews.setOnClickPendingIntent(R.id.textView1, pendingIntent);
appWidgetManager.updateAppWidget(widgetId, remoteViews);
}
stopSelf();
super.onStart(intent, startId);
}
@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
int doTestFeed() throws MalformedURLException, ParseException
{
Log.d("msg"," in do test feed");
InputStream is = null;
int x = 0;
URL myURL = new URL("http://yunn.yu.edu.jo/index.php?option=com_content&view=category&id=55&layout=blog&Itemid=104&format=feed&type=rss");
try {
URLConnection conn = myURL.openConnection();
is = conn.getInputStream();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
XmlPullParserFactory pullParserFactory;
try {
pullParserFactory = XmlPullParserFactory.newInstance();
XmlPullParser parser = pullParserFactory.newPullParser();
parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
parser.setInput(is, null);
Log.d("msg","before making parsing");
x=parseXML(parser);
Log.d("msg","after making parsing");
} catch (XmlPullParserException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
Log.d("msg"," done testing");
return x;
}
//////////////////////////////////////////////////////////////////////////////////
@SuppressLint("SimpleDateFormat")
private int parseXML(XmlPullParser parser) throws XmlPullParserException,IOException, ParseException
{
Log.d("msg"," in parser");
int eventType = parser.getEventType();
int getElement=0;
String pubDate=null;
int numberOfItems=0;
while (eventType != XmlPullParser.END_DOCUMENT){
String tagName = null;
switch (eventType){
//----------------------------------//
case XmlPullParser.START_DOCUMENT:
{
// do nothing
}
break;
//----------------------------------//
case XmlPullParser.START_TAG:
{ tagName = parser.getName();
if ("item".equals(tagName)){
getElement=1;
} else if (getElement!=0){
if ("pubDate".equals(tagName)){
pubDate= parser.nextText();
//String parsedPubDate [] = pubDate.split(" ");
feedsPubDate.add(pubDate);
Log.d("value",pubDate);
}
}
}
break;
//----------------------------------//
case XmlPullParser.END_TAG:
{ tagName = parser.getName();
if (tagName.equalsIgnoreCase("item") && getElement != 0){
}
}
break;
//----------------------------------//
}// end-switch.
eventType= parser.next();
}// end-while.
int i=0;
SharedPreferences sp = getSharedPreferences("tempData", 0);
String dateStringA=sp.getString("recentPubDate", null);
Log.d("oldest date",dateStringA);
for(String s : feedsPubDate )
{
String dateStringB = feedsPubDate.get(i);
SimpleDateFormat parserSDF = new SimpleDateFormat("EEE, DD MMM yyyy HH:mm:ss");
Date dateA = parserSDF.parse(dateStringA);
Date dateB = parserSDF.parse(dateStringB);
if (dateA.compareTo(dateB) < 0) {
Log.d("imp msg","one new item");
numberOfItems++;
}
i++;
}
Log.d("update result", String.valueOf(numberOfItems));
// Toast.makeText(GeneralNews.this,"The size of the list"+feedsTitles.size() , Toast.LENGTH_LONG).show();
return numberOfItems;
} //end xmlParser method.
//////////////////////////////////////////////////////////////////////////////////
}
小部件提供程序代码：
package com.example.testfeeds;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import java.util.Random;
import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.widget.RemoteViews;
public class MyWidgetProvider extends AppWidgetProvider {
private static final String LOG = "testwidgets";
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds) {
Log.w(LOG, "onUpdate method called");
// Get all ids
ComponentName thisWidget = new ComponentName(context,
MyWidgetProvider.class);
int[] allWidgetIds = appWidgetManager.getAppWidgetIds(thisWidget);
// Build the intent to call the service
Intent intent = new Intent(context.getApplicationContext(),
UpdateWidgetService.class);
intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, allWidgetIds);
// Update the widgets via the service
context.startService(intent);
}
}