He implementado unwidget con unImageButton y unTextView. EseImageButton lanzar unactivity cuando se hace clic. Estaactivity actualiza el texto del widget con lo que el usuario escribe sobre la actividadEditText. Ahora el problema es que solo sé cómo obtener las identificaciones de esta manera:

for (int widgetId : allWidgetIds) {
        // Create some random data
        int number = (new Random().nextInt(100));

        RemoteViews remoteViews = new RemoteViews(getApplicationContext()
                .getPackageName(), R.layout.widget_layout);
        Log.w("WidgetExample", String.valueOf(number));

        //Here I should set text from edit text, but I'm using a random for testing.

        remoteViews.setTextViewText(R.id.textView1,
                "Random: " + String.valueOf(number));

        appWidgetManager.updateAppWidget(widgetId, remoteViews);
    }

Este código obviamente cambiará los datos de todos los identificadores, ya que está dentro de unfor. ¿Hay alguna forma de que pueda pasar el widgetId pulsado con mi intención, por lo que puedo eliminar eso?for? Este es mi widgetProvider:

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

    // Get all ids
    ComponentName thisWidget = new ComponentName(context, Widget.class);
    allWidgetIds = appWidgetManager.getAppWidgetIds(thisWidget);
    for (int widgetId : allWidgetIds) {

        Intent i = new Intent(context, WidgetSetup.class);
        i.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, allWidgetIds);
        i.setFlags(i.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(i);

        // Create some random data
        int number = (new Random().nextInt(100));

        RemoteViews remoteViews = new RemoteViews(context.getPackageName(),
                R.layout.widget_layout);
        // Set the text
        remoteViews.setTextViewText(R.id.textView1, String.valueOf(number));

        Intent active = new Intent(context, Widget.class);
        active.setAction(ACTION_WIDGET_REFRESH);
        PendingIntent actionPendingIntent = PendingIntent.getBroadcast(context, 0, active, 0);
        remoteViews.setOnClickPendingIntent(R.id.imageButton1, actionPendingIntent);

        active = new Intent(context, Widget.class);
        active.setAction(ACTION_WIDGET_SETTINGS);
        actionPendingIntent = PendingIntent.getBroadcast(context, 0, active, 0);
        remoteViews.setOnClickPendingIntent(R.id.imageButton2, actionPendingIntent);

        appWidgetManager.updateAppWidget(appWidgetIds, remoteViews);
    }
}

@Override
public void onReceive(Context context, Intent intent) {
    if (intent.getAction().equals(ACTION_WIDGET_REFRESH)) {
        //Log.i("onReceive", ACTION_WIDGET_REFRESH);

        Intent i = new Intent(context, MainActivity.class);
        i.setFlags(i.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(i);

    } else if (intent.getAction().equals(ACTION_WIDGET_SETTINGS)) {
        //Log.i("onReceive", AppWidgetManager.EXTRA_APPWIDGET_ID);



        Intent i = new Intent(context, WidgetSetup.class);
        i.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, allWidgetIds);

        //Here I tried to pass the widgetID with no luck.
        //i.putExtra(pass widget id?);

        i.setFlags(i.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(i);

    } else {
        super.onReceive(context, intent);
    }
}

Gracias