I'm implementing an app widget and I'd like to be able to change the property of a single view in the widget layout, without rebuilding all the RemoteViews from scratch, which involves loading XML etc and which is not necessary in some circumstances.. Is there a way to say "update property X on view identified by a specific ID in the current widget layout"? I've seen that there is a partiallyUpdateAppWidget method in the AppWidgetManager class but I can't understand nor if it is meant for this purpose neither how it must be used.. Can you help me or point me to a useful link or example?
Yes, you can use partiallyUpdateAppWidget method in the AppWidgetManager class.
As an example, if you want to update a text view inside a widget:
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
rv = new RemoteViews(context.getPackageName(), R.layout.widgetlayout);
rv.setTextViewText(R.id.ofTextViewInWidgetLayoutXML, "Hello World");
appWidgetManager.partiallyUpdateAppWidget(appWidgetIds, rv);
Ref: Just update a widget RemoteViews instead of completly creating a new one?
来源：https://stackoverflow.com/questions/11808331/how-to-partially-update-views-in-an-app-widget-without-rebuilding-all-the-remote