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我在使用警报管理器更新我的服务时遇到问题，因为我不知道放置这段代码的真实位置：

SharedPreferences sp = getSharedPreferences("updateOptions", 0);
        int updatePeriod=sp.getInt("UpdatePeriod", -1);


        Calendar cal = Calendar.getInstance();

        Intent i = new Intent(this, UpdateWidgetService.class);
        PendingIntent pintent = PendingIntent.getService(this, 0, intent, 0);

        AlarmManager alarm = (AlarmManager)getSystemService(Context.ALARM_SERVICE);

        alarm.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), updatePeriod, pintent);

事实上，如果 xml 文件（新闻提要）中有新项目，我的任务是通过新项目的总数更新我的应用小部件：

在此处输入图像描述

执行我使用了 2 个类：

1- 更新小部件服务：

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.Calendar;
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.AlarmManager;
import android.app.PendingIntent;
import android.app.Service;
import android.appwidget.AppWidgetManager;
import android.content.ComponentName;
import android.content.Context;
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 {

  public static int numberOfItems=0;



  //numberOfItems=0;
    private static  String LOG = "testwidgets";



    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>(); 


        /////////////////////////////////////////////////////////////////////


        SharedPreferences sp = getSharedPreferences("updateOptions", 0);
        int updatePeriod=sp.getInt("UpdatePeriod", -1);


        Calendar cal = Calendar.getInstance();

        Intent i = new Intent(this, UpdateWidgetService.class);
        PendingIntent pintent = PendingIntent.getService(this, 0, intent, 0);

        AlarmManager alarm = (AlarmManager)getSystemService(Context.ALARM_SERVICE);

        alarm.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), updatePeriod, pintent);





        //////////////////////////////////////////////////////////////////////


        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) {
          // Create some random data



///////////////////////////////////////////////////////////////////////////       

          RemoteViews remoteViews = new RemoteViews(this
              .getApplicationContext().getPackageName(),
              R.layout.widget_layout);

          Log.d("numberOfItems intially", String.valueOf(numberOfItems));

              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.title3,Color.WHITE);
          remoteViews.setTextViewText(R.id.title3,"  "+
              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.title3, 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;






        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();

                         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.

//////////////////////////////////////////////////////////////////////////////////

}

2- MyWidgetProvider：

package com.example.testfeeds;

import android.os.Bundle;
import android.app.Activity;
import android.app.AlarmManager;
import android.view.Menu;

import java.util.Calendar;
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);
      }

}

结果不正确：问题 1 --> 在更新周期为 3600000 毫秒时，每秒调用一次更新服务！问题 2 --> 一旦更新服务被调用，“numberOfItems”就加一！！即使没有我的应用程序的最新日期的项目！实际上我无法指出逻辑错误！是报警管理器的使用位置有问题吗？？

4

2 回答 2

2

只需使用Handler，见下文：

private int mSampleDurationTime = 3600000; // 1 hour
private boolean continueToRun = true;

Handler mHandler = new Handler();

mHandler.postDelayed(mRunnable, mSampleDurationTime);

mRunnable你的任务在哪里：

private final Runnable mRunnable = new Runnable() {

 //...
public void run() {

   // do your stuff here, like update
   // this block of code you going to reach every 1 hour

   if(continueToRun == true){
    mHandler.postDelayed(mRunnable, mSampleDurationTime);
   }

 }
    ...
};

第一次调用postDelayed并调用new Runnable(). 之后，如果要继续，请调用相同的方法run()

于 2013-08-31T12:33:57.320 回答
1

问题 1 --> 在更新周期为 3600000 毫秒时，每秒调用一次更新服务

你确定吗

int updatePeriod=sp.getInt("UpdatePeriod", -1);

回报3600000？如果返回-1，则说明你UpdatePeriod在调用服务之前已经正确保存，setRepeating会被cal.getTimeInMillis()无休止地调用各种意思。

problem 2 --> once the update service is called the "numberOfItems" incremented by one !! even if there are no items its dates newest for my app !! 尝试这个

if (dateA.compareTo(dateB) <= 0)

代替

if (dateA.compareTo(dateB) < 0)

像你一样，我会使用警报来呼叫 AppWdiget 的接收器。但是如果时间计算中存在错误（正如您似乎正在经历的那样），我会使用Alarm#set而不是避免出现问题。setRepeating所以每次我收到第一个警报的意图时，我都会设置另一个警报来触发now()+interval

于 2013-08-31T14:16:28.470 回答