DropdownButtonFormField2

DropdownButtonFormField2(
          decoration: InputDecoration(
            isDense: true,
            contentPadding: EdgeInsets.zero,
            border: OutlineInputBorder(
              borderRadius: BorderRadius.circular(10),
            ),
          ),
          isExpanded: true,
          hint: const Text(
            'Pilih waktu shalat',
            style: TextStyle(fontSize: 14),
          ),
          icon: const Icon(
            Icons.arrow_drop_down,
            color: Colors.black45,
          ),
          iconSize: 30,
          buttonHeight: 60,
          buttonPadding: const EdgeInsets.only(left: 20, right: 10),
          dropdownDecoration: BoxDecoration(
            borderRadius: BorderRadius.circular(15),
          ),
          items: [
            DropdownMenuItem(
                value: DateFormat('HH:mm').format(fajrTime),
                child: Text("Subuh: ${DateFormat('HH:mm').format(fajrTime)}")),
            DropdownMenuItem(
                value: sunriseTime.toString(),
                child:
                    Text("Terbit: ${DateFormat('HH:mm').format(sunriseTime)}")),
            DropdownMenuItem(
                value: dhuha.toString(),
                child: Text("Dhuha: ${DateFormat('HH:mm').format(dhuha)}")),
            DropdownMenuItem(
                value: dhuhrTime.toString(),
                child:
                    Text("Dhuhur: ${DateFormat('HH:mm').format(dhuhrTime)}")),
            DropdownMenuItem(
                value: asrTime.toString(),
                child: Text("Ashar: ${DateFormat('HH:mm').format(asrTime)}")),
            DropdownMenuItem(
                value: maghribTime.toString(),
                child: Text(
                    "Maghrib: ${DateFormat('HH:mm').format(maghribTime)}")),
            DropdownMenuItem(
                value: ishaTime.toString(),
                child: Text("Isya: ${DateFormat('HH:mm').format(ishaTime)}")),
          ],
          validator: (value) {
            if (value == null) {
              return 'Pilih waktu shalat!';
            }
            return null;
          },
          onChanged: (value) {
            selectedWaktuShalat = DateTime.parse(value.toString());
          },
          onSaved: (value) {},
        )