Android实现widget定时更新

01.public class NewsWidgetProvider extends AppWidgetProvider {  
02. 
03. 
04.    @Override 
05.    public void onDeleted(Context context, int[] appWidgetIds) {  
06.    }  
07. 
08.    @Override 
09.    public void onDisabled(Context context) {  
10.        // TODO Auto-generated method stub  
11.        super.onDisabled(context);  
12.    }  
13. 
14.    @Override 
15.    public void onEnabled(Context context) {  
16.        // TODO Auto-generated method stub  
17.        super.onEnabled(context);  
18.    }  
19. 
20.    @Override 
21.    public void onUpdate(Context context, AppWidgetManager appWidgetManager,int[] appWidgetIds) {  
22. 
23.        NewsService.updateAppWidgetIds(appWidgetIds);  
24.        context.startService(new Intent(context,NewsService.class));  
25.    }  
26.      
27.    public static RemoteViews updateAppWidget(Context context,List<RssNews> list) {  
28.        RemoteViews views = new RemoteViews(context.getPackageName(),R.layout.appwidget_layout);  
29.        if (list.size() > 3) {  
30.            views.setTextViewText(R.id.textView01, list.get(0).title);  
31.            views.setTextViewText(R.id.textView02, list.get(1).title);  
32.            views.setTextViewText(R.id.textView03, list.get(2).title);  
33.        }  
34. 
35.        Intent detailIntent=new Intent(context,NewsSiteList.class);  
36.          
37.        PendingIntent pending=PendingIntent.getActivity(context, 0, detailIntent, 0);  
38.        views.setOnClickPendingIntent(R.id.textView01, pending);  
39.        views.setOnClickPendingIntent(R.id.textView02, pending);  
40.        views.setOnClickPendingIntent(R.id.textView03, pending);  
41.        return views;  
42.    }  
43.      
44.    @Override 
45.    public void onReceive(Context context, Intent intent) {  
46.        super.onReceive(context, intent);  
47.    }  
48. 
49.} 
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01.public class NewsWidgetProvider extends AppWidgetProvider {  
02. 
03. 
04.    @Override 
05.    public void onDeleted(Context context, int[] appWidgetIds) {  
06.    }  
07. 
08.    @Override 
09.    public void onDisabled(Context context) {  
10.        // TODO Auto-generated method stub  
11.        super.onDisabled(context);  
12.    }  
13. 
14.    @Override 
15.    public void onEnabled(Context context) {  
16.        // TODO Auto-generated method stub  
17.        super.onEnabled(context);  
18.    }  
19. 
20.    @Override 
21.    public void onUpdate(Context context, AppWidgetManager appWidgetManager,int[] appWidgetIds) {  
22. 
23.        NewsService.updateAppWidgetIds(appWidgetIds);  
24.        context.startService(new Intent(context,NewsService.class));  
25.    }  
26.      
27.    public static RemoteViews updateAppWidget(Context context,List<RssNews> list) {  
28.        RemoteViews views = new RemoteViews(context.getPackageName(),R.layout.appwidget_layout);  
29.        if (list.size() > 3) {  
30.            views.setTextViewText(R.id.textView01, list.get(0).title);  
31.            views.setTextViewText(R.id.textView02, list.get(1).title);  
32.            views.setTextViewText(R.id.textView03, list.get(2).title);  
33.        }  
34. 
35.        Intent detailIntent=new Intent(context,NewsSiteList.class);  
36.          
37.        PendingIntent pending=PendingIntent.getActivity(context, 0, detailIntent, 0);  
38.        views.setOnClickPendingIntent(R.id.textView01, pending);  
39.        views.setOnClickPendingIntent(R.id.textView02, pending);  
40.        views.setOnClickPendingIntent(R.id.textView03, pending);  
41.        return views;  
42.    }  
43.      
44.    @Override 
45.    public void onReceive(Context context, Intent intent) {  
46.        super.onReceive(context, intent);  
47.    }  
48. 
49.} 
public class NewsWidgetProvider extends AppWidgetProvider {


@Override
public void onDeleted(Context context, int[] appWidgetIds) {
}

@Override
public void onDisabled(Context context) {
// TODO Auto-generated method stub
super.onDisabled(context);
}

@Override
public void onEnabled(Context context) {
// TODO Auto-generated method stub
super.onEnabled(context);
}

@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,int[] appWidgetIds) {

NewsService.updateAppWidgetIds(appWidgetIds);
context.startService(new Intent(context,NewsService.class));
}

public static RemoteViews updateAppWidget(Context context,List<RssNews> list) {
RemoteViews views = new RemoteViews(context.getPackageName(),R.layout.appwidget_layout);
if (list.size() > 3) {
views.setTextViewText(R.id.textView01, list.get(0).title);
views.setTextViewText(R.id.textView02, list.get(1).title);
views.setTextViewText(R.id.textView03, list.get(2).title);
}

Intent detailIntent=new Intent(context,NewsSiteList.class);

PendingIntent pending=PendingIntent.getActivity(context, 0, detailIntent, 0);
views.setOnClickPendingIntent(R.id.textView01, pending);
views.setOnClickPendingIntent(R.id.textView02, pending);
views.setOnClickPendingIntent(R.id.textView03, pending);
return views;
}

@Override
public void onReceive(Context context, Intent intent) {
super.onReceive(context, intent);
}

}

Service:

Java代码 
01.public class NewsService extends Service implements Runnable {  
02.      
03.    private static final String TAG="NewsService";   
04. 
05.    private static Queue<Integer> sAppWidgetIds=new LinkedList<Integer>();  
06.      
07.    public static final String ACTION_UPDATE_ALL = "com.xxxx.news.UPDATE_ALL";  
08.      
09.    private static boolean sThreadRunning = false;  
10.      
11.    private static Object sLock = new Object();  
12.      
13. 
14.      
15.    @Override 
16.    public IBinder onBind(Intent intent) {  
17.        return null;  
18.    }  
19.      
20.    public static void updateAppWidgetIds(int[] appWidgetIds){  
21.        synchronized (sLock) {  
22.            for (int appWidgetId : appWidgetIds) {  
23.                sAppWidgetIds.add(appWidgetId);  
24.            }  
25.        }  
26.    }  
27.      
28.    public static int getNextWidgetId(){  
29.        synchronized (sLock) {  
30.            if (sAppWidgetIds.peek() == null) {  
31.                return AppWidgetManager.INVALID_APPWIDGET_ID;  
32.            } else {  
33.                return sAppWidgetIds.poll();  
34.                  
35.            }  
36.        }  
37.    }  
38.      
39.    private static boolean hasMoreUpdates() {  
40.        synchronized (sLock) {  
41.            boolean hasMore = !sAppWidgetIds.isEmpty();  
42.            if (!hasMore) {  
43.                sThreadRunning = false;  
44.            }  
45.            return hasMore;  
46.        }  
47.    }  
48. 
49.    @Override 
50.    public void onCreate() {  
51.        super.onCreate();  
52.    }  
53. 
54.    @Override 
55.    public void onStart(Intent intent, int startId) {  
56.        super.onStart(intent, startId);  
57.        if (null != intent) {  
58.            if (ACTION_UPDATE_ALL.equals(intent.getAction())) {  
59.                AppWidgetManager widget = AppWidgetManager.getInstance(this);  
60.                updateAppWidgetIds(widget.getAppWidgetIds(new ComponentName(this, NewsWidgetProvider.class)));  
61.            }  
62.        }  
63.        synchronized (sLock) {  
64.            if (!sThreadRunning) {  
65.                sThreadRunning=true;  
66.                new Thread(this).start();  
67.            }  
68.        }  
69.    }  
70. 
71.    @Override 
72.    public void run() {  
73.        SharedPreferences setting=getSharedPreferences("com.xxxx.news_preferences", 0);  
74.        String updateTime=setting.getString("list_time", "1800000");  
75.        String updateUrl=setting.getString("list_site", "xxxxxxxxx");  
76.          
77.          
78.        AppWidgetManager appWidgetManager=AppWidgetManager.getInstance(this);  
79.        RemoteViews updateViews=null;  
80.          
81.        while (hasMoreUpdates()) {  
82.            int appWidgetId=getNextWidgetId();  
83.            List<RssNews> listNews = NewsContenttList.getNewsList(updateUrl);  
84.            if (listNews != null) {  
85.                updateViews = NewsWidgetProvider.updateAppWidget(this, listNews);  
86.            }  
87.            if (updateViews != null) {  
88.                appWidgetManager.updateAppWidget(appWidgetId, updateViews);  
89.            }  
90.        }  
91.          
92.        Intent updateIntent=new Intent(ACTION_UPDATE_ALL);  
93.        updateIntent.setClass(this, NewsService.class);  
94.        PendingIntent pending=PendingIntent.getService(this, 0, updateIntent, 0);  
95.          
96.        Time time = new Time();  
97.        long nowMillis = System.currentTimeMillis();  
98.        time.set(nowMillis+Long.parseLong(updateTime));  
99.        long updateTimes = time.toMillis(true);  
100.        Log.d(TAG, "request next update at "+updateTimes);  
101.          
102.        AlarmManager alarm=(AlarmManager)getSystemService(Context.ALARM_SERVICE);  
103.        alarm.set(AlarmManager.RTC_WAKEUP, updateTimes, pending);  
104.        stopSelf();  
105.    }  
106. 
107.}