if語句中的微調器的選定項目

Question

如何在選定值= 0時使用微調器的if statement？

if(wilayat.setSelection(0) || city.setSelection(0) || 
    station.setSelection(0) || distnation.setSelection(0)) { 

      message = "Select the 4 fields, please.."; 
      Toast.makeText(BusArrivalTime.this, message, Toast.LENGTH_SHORT).show(); 

     } 

Answer 1

試試這個。

if (wilayat.getSelectedItemPosition() == 0 || city.getSelectedItemPosition() == 0 || station.getSelectedItemPosition() == 0 || distnation.getSelectedItemPosition() == 0) { 
     message = "Select the 4 fields, please.."; 
     Toast.makeText(BusArrivalTime.this, message, Toast.LENGTH_SHORT).show(); 
} 

只需使用getSelectedItemPosition()方法。

您確定wilayat，city等是Spinner。

添加判斷

if (wilayat != null || city != null || station != null || distnation != null) { 
    // do something 
}