Question

这是我想要的AppWidget：

配置活动出现，当窗口小部件添加到屏幕//好到目前为止
保存配置后，启动服务以更新小部件//到目前为止
定期计划警报以运行更新窗口小部件的服务。 //在这里遇到麻烦

这已经严重地给了我一头白发，我不知道该怎么做了。如何从服务中设置AppWidget的更新速率？我可以从服务更新小部件，但是当我尝试设置警报时，它无法访问AppWidget上的onReceive()方法。

以下是服务更新的代码：

Intent updateWidget = new Intent();
updateWidget.setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
updateWidget.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, new int[]{appWidgetId});
Uri data = Uri.withAppendedPath(Uri.parse(WeatWidgetProvider.URI_SCHEME +
 "://widget/id/"), String.valueOf(appWidgetId));
updateWidget.setData(data);
PendingIntent updatePend = PendingIntent.getBroadcast(this, 0, updateWidget, PendingIntent.FLAG_UPDATE_CURRENT);
AlarmManager alarm = (AlarmManager)getSystemService(ALARM_SERVICE);
alarm.setRepeating(AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime()+ updateRate, updateRate, updatePend);

在WidgetProviderClass的onreceive()中：

public void onReceive(Context context, Intent intent){
  super.onReceive(context, intent);
  Log.d("OnReceive", "OnReceive called");
  String action = intent.getAction();
  Log.d("Action", "OnReceive:Action: " + action);
  if(AppWidgetManager.ACTION_APPWIDGET_DELETED.equals(action)){
    int appwidgetId = intent.getExtras().getInt(AppWidgetManager.EXTRA_APPWIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID);
    if(appwidgetId != AppWidgetManager.INVALID_APPWIDGET_ID){
      this.onDeleted(context, new int[] {appwidgetId});
    }
  } else if(AppWidgetManager.ACTION_APPWIDGET_UPDATE.equals(action)){
    if(!URI_SCHEME.equals(intent.getScheme())){
      final int[] appWidgetIds = intent.getIntArrayExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS);
      for(int appWidgetId:appWidgetIds){
        SharedPreferences prefs = context.getSharedPreferences(WeatForecastConfigure.WEATHER_PREF_NAME, Context.MODE_PRIVATE);
        update = prefs.getInt(WeatForecastConfigure.REFRESH_UPDATE, -1);
        System.out.println(update);
        if(update != -1){
          Intent widgetUpdate = new Intent();
          widgetUpdate.setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
          widgetUpdate.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, new int[] { appWidgetId });
          // make this pending intent unique by adding a scheme to it
          widgetUpdate.setData(Uri.withAppendedPath(Uri.parse(WeatWidgetProvider.URI_SCHEME +
           "://widget/id/"), String.valueOf(appWidgetId)));
          PendingIntent newPending = PendingIntent.getBroadcast(context.getApplicationContext(), 0, widgetUpdate, PendingIntent.FLAG_UPDATE_CURRENT);
          // schedule the updating
          AlarmManager alarms = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
          alarms.setRepeating(AlarmManager.ELAPSED_REALTIME,
           SystemClock.elapsedRealtime(), WeatForecastConfigure.convertToMillis(update), newPending);
        }
      }
    }
    super.onReceive(context, intent);
  }else{
    super.onReceive(context, intent);
  }
}

对于onUpdate()评论的行是故意的。

public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds){
  Log.d("OnUpdate", "OnUpdate called");
  for (int appWidgetId : appWidgetIds) {
    // context.startService(new Intent(context,WeatService.class));
  }
  //super.onUpdate(context, appWidgetManager, appWidgetIds);
}

请帮忙。我不知道如何设置警报更新。无论是从配置类还是从服务中执行，它都不起作用。感谢。

Answer 1

我认为您需要在您的意图中使用标准URI方案，如下所示：

intent.setData(Uri.parse(intent.toUri(Intent.URI_INTENT_SCHEME)));

Answer 2

我写了这一切，并意识到它可能会让你更加困惑，哦。好吧。

以下是我如何更新我的小部件的框架，它基于这段代码http://code.google.com/p/android-sky/source/browse/#svn%2Ftrunk%2FSky（特别是UpdateService类。）

主要区别在于我的代码

启动服务以执行更新
设置警报（广播待处理意图）以警告窗口小部件有关下一次更新的信息
更新小部件并停止服务
接收更新广播（在提供者onReceive中）并再次启动服务

您似乎试图告诉AppWidgetProvider启动onUpdate，我不确定这是否可行？

以下是我在半伪代码中的表现：

UpdateService类：

 //based on (an old) example http://code.google.com/p/android-sky/source/browse/#svn%2Ftrunk%2FSky however other methods I have tried have not been as reliable as this
 public void run() {
     //set the alarm for the next update
     AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
 long millis = System.currentTimeMillis();

     //one alarm to update them all, if you wanted to you could
     //add an extra appWidgetId then you might need to encode the intent
     //however so it is a unique PendingIntent
     Intent updateIntent = new Intent(ACTION_UPDATE_ALL);  //ACTION_UPDATE_ALL should be a constant somewhere that can be used to resolve this action com.packagename.ACTION_UPDATE_ALL
     PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, updateIntent, 0);
     // Schedule alarm, and force the device awake for this update
     alarmManager.set(AlarmManager.RTC, millis + updateFrequency * DateUtils.MINUTE_IN_MILLIS, pendingIntent);
     Log.d(TAG, "Next update should be at: " + DateFormat.format("h:mm:ss", millis + updateFrequency * DateUtils.MINUTE_IN_MILLIS));


     while (hasMoreUpdates()) {
        int appWidgetId = getNextUpdate();
        if (!(appWidgetId == AppWidgetManager.INVALID_APPWIDGET_ID)) {
            Uri appWidgetUri = ContentUris.withAppendedId(Agenda.getContentUri(context), appWidgetId);

            AppWidgetProviderInfo info = manager.getAppWidgetInfo(appWidgetId);  
            String providerName = info.provider.getClassName();
            //if the provider matches one of my widget classes, call the update method
            if (providerName.equals(Widget_4_1.class.getName())) {
                 remoteViews = Widget_4_1.buildUpdate(context, appWidgetUri, dateRows);
            }

            //perform more actions such as sending remoteViews to the AppWidgetManager
        }
    }
}

Widget_4_1课程：

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

    // If no specific widgets requested, collect list of all
    if (appWidgetIds == null) {
        appWidgetIds = appWidgetManager.getAppWidgetIds(new ComponentName(
                context, AbstractWidget.class));
    }

    UpdateService.requestUpdate(appWidgetIds);
    Intent i = new Intent();
    i.setComponent(new ComponentName(context, UpdateService.class));
    context.startService(i);
}

//called from service
public static RemoteViews buildUpdate(Context context, Uri appWidgetUri) {
    int appWidgetId = (int) ContentUris.parseId(appWidgetUri);
    RemoveViews remoteViews = someMethodToBuildView(appWidgetId );
    //return view to service
    return remoteViews;
}

public void onReceive(Context context, Intent intent) {

final String action = intent.getAction();

    //when the alarm triggers, just update all your widgets, why handle them separately?
if (action.equals(ACTION_UPDATE_ALL)) {
        AppWidgetManager manager = AppWidgetManager.getInstance(context);
    int[] appWidgetIds = manager.getAppWidgetIds(new ComponentName(context, getClass()));
    if(appWidgetIds.length>0){
            UpdateService.requestUpdate(appWidgetIds);
    Intent updateIntent = new Intent(context, UpdateService.class);
            updateIntent.setAction(action);

        context.startService(updateIntent);
    }
    }
    //else you could catch a specific action for updating a single widget and
    //tell your update service to do it manually
}

的AndroidManifest.xml：

<application> 
     ...
    <receiver android:name="com.mypackage.Widget_4_1"
        android:label="@string/agenda_widget_name_4_1">
    <intent-filter>
            <!-- IMPORTANT, needs to match the ACTION_UPDATE_ALL string (e.g. a constant somewhere) -->
        <action android:name="com.packagename.UPDATE_ALL" />
    </intent-filter>
    <meta-data android:name="android.appwidget.provider"
            android:resource="@xml/widget_4_1" />
</receiver>
    ...
</application>

希望我没有让你困惑。

由于此代码是从我的项目的各个部分复制/粘贴的，请原谅错字等，我会在指出时修复它们。

从服务定期更新AppWidget

2 个答案: