Widget UI not updating in response to broadcast

问题

I have a couple of widgets which are basically quick links to functionality within my app,

These widgets are basically ListView/GridViews which are being backed by data that changes during the main App's execution.

Since the data is only changed during app execution the update frequency is set as so:

android:updatePeriodMillis="0"

and on the data changed I fire the following:

public void updateWidget(@SuppressWarnings("rawtypes") Class provider) {
    AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(this);
    int[] gridids = appWidgetManager.getAppWidgetIds(new ComponentName(this.getPackageName(), provider.getName()));

    Intent intent = new Intent(this, provider);
    intent.setAction("android.appwidget.action.APPWIDGET_UPDATE");
    intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS,gridids);
    sendBroadcast(intent);
}

I'm able to catch this in the onReceive() of the Provider and from their call the update mechanism:

public void onReceive(Context context, Intent intent) {
    super.onReceive(context, intent);
    Log.e(this.getClass().getSimpleName(), "onReceive()");
    int[] ids = intent.getExtras().getIntArray("appWidgetIds");
    for(int id : ids) onUpdateWithService(context, id);
}

protected void onUpdateWithService(Context context, int widgetId) {     
    super.onUpdateWithService(context, widgetId);
    RemoteViews views = new RemoteViews(context.getPackageName(), getResourceLayout(context, widgetId));                    

    Intent intent = new Intent(context, GridViewWidgetServiceAdapter.class);
    intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, widgetId);
    intent.setData(Uri.parse(intent.toUri(Intent.URI_INTENT_SCHEME)));

    views.setRemoteAdapter(R.id.listView, intent);
    views.setPendingIntentTemplate(R.id.listView, PendingIntent.getActivity(context, -1, new Intent(), PendingIntent.FLAG_UPDATE_CURRENT));
    AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
    appWidgetManager.updateAppWidget(widgetId, views);
}

The problem I'm having is that although the code fires and updateAppWidget() is called, the UI of the widget doesn't change.

Am I missing a trick involved in Widget updates?

回答1:

This answer seems to fix the problem.

Not sure why it fixes the problem, but it does...

Adding the following line to the intent works fine

Intent intent = new Intent(context, GridViewWidgetServiceAdapter.class);
intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, widgetId);
intent.putExtra("Random", Math.random() * 1000); // Add a random integer to stop the Intent being ignored.
intent.setData(Uri.parse(intent.toUri(Intent.URI_INTENT_SCHEME)));

来源：https://stackoverflow.com/questions/18183415/widget-ui-not-updating-in-response-to-broadcast

标签

android

android-widget