如何使用ListView强制更新窗口小部件

Question

I need help with my app widget. I need force update on him from any activity. Widget reflect list from app, and after I do some updates or deletes on list. I need to show in widget real data. Please help, how can i force update of this widget from any app activity ?

AppWidgetProvider

public class Widget extends AppWidgetProvider {

...

@Override
public void onReceive(Context context, Intent intent) {
    AppWidgetManager mgr = AppWidgetManager.getInstance(context);
    if (intent.getAction().equals(TOAST_ACTION)) {
        int appWidgetId = intent.getIntExtra(
                AppWidgetManager.EXTRA_APPWIDGET_ID,
                AppWidgetManager.INVALID_APPWIDGET_ID);
        String id = intent.getStringExtra(EXTRA_ITEM);

        Intent uIntent = new Intent(context, UlohaShowerActivity.class);
        uIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        uIntent.putExtra(UlohaShowerActivity.ODOSLI, id);
        context.startActivity(uIntent);
    }
    super.onReceive(context, intent);
}

@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
        int[] appWidgetIds) {
    final int N = appWidgetIds.length;

    for (int i = 0; i < N; ++i) {
        RemoteViews remoteViews = updateWidgetListView(context,
                appWidgetIds[i]);
        appWidgetManager.updateAppWidget(appWidgetIds[i], remoteViews);
    }
    super.onUpdate(context, appWidgetManager, appWidgetIds);
}

private RemoteViews updateWidgetListView(Context context, int appWidgetId) {

    RemoteViews remoteViews = new RemoteViews(context.getPackageName(),
            R.layout.widget_uloha_layout);

    Intent intent = new Intent(context, UlohaPridajActivity.class);
    PendingIntent pendingIntent = PendingIntent.getActivity(context, 0,
            intent, 0);
    remoteViews.setOnClickPendingIntent(R.id.widgetUlohaAdd, pendingIntent);

    Intent svcIntent = new Intent(context, WidgetService.class);
    svcIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
    svcIntent.setData(Uri.parse(svcIntent.toUri(Intent.URI_INTENT_SCHEME)));

    remoteViews.setRemoteAdapter(appWidgetId, R.id.listUloha_w, svcIntent);
    remoteViews.setEmptyView(R.id.listUloha_w, R.id.empty_view);

    Intent toastIntent = new Intent(context, Widget.class);
    toastIntent.setAction(Widget.TOAST_ACTION);
    toastIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
    intent.setData(Uri.parse(intent.toUri(Intent.URI_INTENT_SCHEME)));
    PendingIntent toastPendingIntent = PendingIntent.getBroadcast(context, 0, toastIntent,
            PendingIntent.FLAG_UPDATE_CURRENT);
    remoteViews.setPendingIntentTemplate(R.id.listUloha_w, toastPendingIntent);

    return remoteViews;
}
}

RemoteViewsFactory

public class ListProvider implements RemoteViewsFactory {
....

public ListProvider(Context context, Intent intent) {
    this.context = context;
    appWidgetId = intent.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID,
            AppWidgetManager.INVALID_APPWIDGET_ID);

    populateListItem();
}

...

@Override
public RemoteViews getViewAt(int position) {
    final RemoteViews remoteView = new RemoteViews(
            context.getPackageName(), R.layout.uloha_list_row);
    ListItem listItem = listItemList.get(position);
    remoteView.setTextViewText(R.id.nazov, listItem.nazov);
    remoteView.setTextViewText(R.id.datum, listItem.datum);
    remoteView.setTextViewText(R.id.cas, listItem.cas);

    Bundle extras = new Bundle();
    extras.putString(Widget.EXTRA_ITEM, listItem.id);
    Intent fillInIntent = new Intent();
    fillInIntent.putExtras(extras);
    remoteView.setOnClickFillInIntent(R.id.uloha_list_row, fillInIntent);

    try {
        System.out.println("Loading view " + position);
        Thread.sleep(500);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
    return remoteView;
}
...
}

WidgetService

public class WidgetService extends RemoteViewsService {

@Override
public RemoteViewsFactory onGetViewFactory(Intent intent) {
    int appWidgetId = intent.getIntExtra(
            AppWidgetManager.EXTRA_APPWIDGET_ID,
            AppWidgetManager.INVALID_APPWIDGET_ID);

    return (new ListProvider(this.getApplicationContext(), intent));
}
}

Answer 1

I found solution for simmilar problem by creating static method of appWidgetProvider for updating widgets views. This method can be called by system from original onUpdate method, or you can call this method from whenever you want:

private static int[] savedAppWidgetIds;

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

    savedAppWidgedIds = appWidgetIds;
    MyAppWidgetProvider.onUpdateMyView(context);

}

public static void onUpdateMyView(Context context) {

    RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget_uloha_layout);
    for (int i = 0; i < savedAppWidgetIds.size; i++) {

        int appWidgetId = savedAppWidgetIds[i];
        // update your widget, 

Then u can call onUpdateMyWidget() method from everywhere by:

MyAppWidgetProvider.onUpdateMyView(context);