android - 如何使用/設置嵌套spinners？

在片段中工作時，我試圖返回一個從選擇微調器中的項目確定的值，但我無法使其工作。方法內的Toast通知不起作用，看起來問題在方法中。我怎樣才能解決這個問題？android - 如何使用/設置嵌套spinners？

public Spinner districtSpinner, countySpinner; 
public int selectedDistrict;

是使用的變量。這裏是我的父母旋塗法，districtSpinner（）

public void districtSpinner() { 

    ArrayAdapter<String> Dadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.districtNames)); 
    Dadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line); 
    districtSpinner.setAdapter(Dadapter); 

    districtSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 

                public void onItemSelected(AdapterView<?> parent, View view, 
                      int position, long id) { 
                 selectedDistrictPosition = districtSpinner.getSelectedItemPosition(); 
                 switch (selectedDistrictPosition) { 
                  case 0: { 
                   selectedDistrict = 1; 
                   break; 
                  } 
                  case 1: { 
                   selectedDistrict=2; 
                   break; 
                  } 
                  case 2: { 
                   selectedDistrict=3; 
                   break; 
                  } 
                  case 3: { 
                   selectedDistrict=4; 
                   break; 
                  } 
                  case 4: { 
                   selectedDistrict=5; 
                   break; 
                  } 
                  case 5: { 
                   selectedDistrict=6; 
                   break; 
                  } 
                  case 6: { 
                   selectedDistrict=8; 
                   break; 
                  } 
                  case 7: { 
                   selectedDistrict=9; 
                   break; 
                  } 
                  case 8: { 
                   selectedDistrict=10; 
                   break; 
                  } 
                  case 9: { 
                   selectedDistrict=11; 
                   break; 
                  } 
                  case 10: { 
                   selectedDistrict=12; 
                   break; 
                  } 
                  default: { 
                   selectedDistrict=1; 
                   break; 
                  } 
                 } 
                } 

                public void onNothingSelected(AdapterView<?> parent) { 
                } 
               } 
    ); 

}

這是孩子微調「countySpinner」我想使依賴於父微調。該方法應根據selectedDistrict進行切換，並使用包含每個區縣的集合（R.array.districtx）的相應字符串數組設置微調器。目前，第二個微調器什麼都不做，就我而言，這個縣的調子（）甚至沒有被調用。

public void countySpinner() { 

    switch (selectedDistrict) { 
     case 0: { 
      break; 
     } 
     case 1: { 
      ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.district1)); 
      Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line); 
      countySpinner.setAdapter(Cadapter); 

      countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
                 public void onItemSelected(AdapterView<?> parent, View view, 
                        int position, long id) { 
                 } 

                 public void onNothingSelected(AdapterView<?> parent) { 
                 } 
                } 
      ); 
      break; 
     } 
     case 2: { 
      ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.district2)); 
      Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line); 
      countySpinner.setAdapter(Cadapter); 

      countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
                 public void onItemSelected(AdapterView<?> parent, View view, 
                        int position, long id) { 
                 } 

                 public void onNothingSelected(AdapterView<?> parent) { 
                 } 
                } 
      ); 
      break; 
     } 
     case 3: { 
      ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.district3)); 
      Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line); 
      countySpinner.setAdapter(Cadapter); 

      countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
                 public void onItemSelected(AdapterView<?> parent, View view, 
                        int position, long id) { 
                 } 

                 public void onNothingSelected(AdapterView<?> parent) { 
                 } 
                } 
      ); 
      break; 
     } 
     case 4: { 
      ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.district4)); 
      Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line); 
      countySpinner.setAdapter(Cadapter); 

      countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
                 public void onItemSelected(AdapterView<?> parent, View view, 
                        int position, long id) { 
                 } 

                 public void onNothingSelected(AdapterView<?> parent) { 
                 } 
                } 
      ); 
      break; 
     } 
     case 5: { 
      ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.district5)); 
      Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line); 
      countySpinner.setAdapter(Cadapter); 

      countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
                 public void onItemSelected(AdapterView<?> parent, View view, 
                        int position, long id) { 
                 } 

                 public void onNothingSelected(AdapterView<?> parent) { 
                 } 
                } 
      ); 
      break; 
     } 
     case 6: { 
      ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.district6)); 
      Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line); 
      countySpinner.setAdapter(Cadapter); 

      countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
                 public void onItemSelected(AdapterView<?> parent, View view, 
                        int position, long id) { 
                 } 

                 public void onNothingSelected(AdapterView<?> parent) { 
                 } 
                } 
      ); 
      break; 
     } 
     case 7: { 

      break; 
     } 
     case 8: { 
      ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.district8)); 
      Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line); 
      countySpinner.setAdapter(Cadapter); 

      countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
                 public void onItemSelected(AdapterView<?> parent, View view, 
                        int position, long id) { 
                 } 

                 public void onNothingSelected(AdapterView<?> parent) { 
                 } 
                } 
      ); 
      break; 
     } 
     case 9: { 
      ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.district9)); 
      Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line); 
      countySpinner.setAdapter(Cadapter); 

      countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
                 public void onItemSelected(AdapterView<?> parent, View view, 
                        int position, long id) { 
                 } 

                 public void onNothingSelected(AdapterView<?> parent) { 
                 } 
                } 
      ); 
      break; 
     } 
     case 10: { 
      ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.district10)); 
      Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line); 
      countySpinner.setAdapter(Cadapter); 

      countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
                 public void onItemSelected(AdapterView<?> parent, View view, 
                        int position, long id) { 
                 } 

                 public void onNothingSelected(AdapterView<?> parent) { 
                 } 
                } 
      ); 
      break; 
     } 
     case 11: { 
      ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.district11)); 
      Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line); 
      countySpinner.setAdapter(Cadapter); 

      countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
                 public void onItemSelected(AdapterView<?> parent, View view, 
                        int position, long id) { 
                 } 

                 public void onNothingSelected(AdapterView<?> parent) { 
                 } 
                } 
      ); 
      break; 
     } 
     case 12: { 
      ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.district12)); 
      Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line); 
      countySpinner.setAdapter(Cadapter); 

      countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
                 public void onItemSelected(AdapterView<?> parent, View view, 
                        int position, long id) { 
                 } 

                 public void onNothingSelected(AdapterView<?> parent) { 
                 } 
                } 
      ); 
      break; 
     } 
     default: { 
      break; 
     } 

    }

來源

2014-09-19 JHinne

districtSpinner（）是如何使用的？看起來你調用它並期望所選的int是返回值。 – 2014-09-19 15:05:34

@ErikNedwidek它幾乎只是用來指定選擇哪個區域。我試圖在開關情況下使用返回的int。 – JHinne 2014-09-19 15:08:02

這就是問題所在。 'switch case'只會在選擇項目時運行，而不是在調用'districtSpinner（）'方法時運行。 – 2014-09-19 20:34:06

你可以說這個問題更好，比如I want to setup my second spinner according to the choice made in first spinner。那麼你最好這樣做，因爲你有辦法在其中得到相同的代碼。

public void districtSpinner() { 

ArrayAdapter<String> Dadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.districtNames)); 
Dadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line); 
districtSpinner.setAdapter(Dadapter); 

districtSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { 

     int selectedDistrict = position+1; 
     // do yourself a favor and intoduce an empty choice for 7; 


     countySpinner(selectedDistrict);          
    } 

    public void onNothingSelected(AdapterView<?> parent) { 
    } 
} 
); 
} 

private int getDistrictResourceId (int districtnr) { 
    int resId = R.array.district1; 
    switch (districtnr) 
    { 
    case 1: 
    resId = R.array.district1; 
    break; 
    case 2: 
    resId = R.array.district2; 
    break; 

    // please add the rest 
    } 

return resId; 
} 

public void countySpinner(int districtnr) { 

int resId = getDistrictResourceId(districtnr); 

ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(resId)); 
     Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line); 
     countySpinner.setAdapter(Cadapter); 

     countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
      public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { 
      } 
      public void onNothingSelected(AdapterView<?> parent) { 
      } 
} 
     );   
    } 
}

來源

2014-09-22 17:05:03 greenapps

完美的工作，謝謝！我甚至沒有想過改變你的做法，這比我使用的方法簡單得多。 – JHinne 2014-09-22 17:32:25

就我所見，你應該看到吐司。但讓它返回一個值是沒有意義的。您只是在該功能中設置適配器。確實有一個onclicklistener，並在點擊selectedDistrict設置。但是，只有當用戶點擊一個項目時纔會發生這種情況。你的功能早已回覆。你的函數現在返回你調用它之前的靜態selectedDistrict值。

來源

2014-09-19 18:56:42 greenapps

如何在選擇時存儲該值，然後保存該值？ – JHinne 2014-09-22 13:21:29

這取決於你想用這個值生活多久。但是如果它能在應用程序重新啓動後生存下來，您可以使用共享首選項 – greenapps 2014-09-22 13:43:56

我只需要它的存活時間足夠長，以便用戶在數據記錄會話結束時將值與其餘測量/數據一起導出。 – JHinne 2014-09-22 13:45:24

android - 如何使用/設置嵌套spinners？

回答

相關問題