Android微調值無法顯示答案

Question

我遇到了微調問題，它沒有顯示任何內容，並且出現錯誤。請在下面檢查代碼：

private void createSpinnerValues(){ 

    spinnerValues = new HashMap<String, Double>(); 
    spinnerValues.put("Sedentary", 1.2); 
    spinnerValues.put("Lightly Active", 1.375); 
    spinnerValues.put("Moderately Active", 1.55); 
    spinnerValues.put("Heavily Active", 1.725); 

} // end of createSpinnerValue 

private Double getAnswer(String age, String in, String ft, String weight, Double selectedItemValueFromSpinner) { 

    double answer = ((66 + (6.2377 * Double.parseDouble(weight)) + 
      (12.7084 * (Double.parseDouble(in) * 12 + Double.parseDouble(ft))) 
      - (6.8 * Double.parseDouble(age))) * selectedItemValueFromSpinner); 
    return answer; 

} // end of getAnswer method 

private Double getSelectedItemValueFromSpinnerText(String spinnerText) { 

    Double val = spinnerValues.get( spinnerText); 
    if(val==null){ 
     Log.i("DEMO", "Value is null"); } 
    return val; 

} 


     private void calculateWomen(){ 

    String f1a = etft.getText().toString(); 
    String f2a = etin.getText().toString(); 
    String f3a = etweight.getText().toString(); 
    String f4a = etage.getText().toString(); 

    if ((f1a.isEmpty() || f2a.isEmpty() || f3a.isEmpty() || f4a.isEmpty())) 
     // call for custom toast 
     viewErrorToast(); 
    else{ 
    // Metric Formula for BMR (Women) English Unit 
    //655 + (4.3379 x weight in pounds) + 
    //(4.6980 x height in inches) - (4.6756 x age in years) 
    String age, in, ft, weight; 
    Double answer; 

    age = etage.getText().toString(); 
    in = etin.getText().toString();  
    ft = etft.getText().toString(); 
    weight = etweight.getText().toString(); 

    answer = ((665 + (4.3379 * Double.parseDouble(weight)) + 
      (4.6980 * (Double.parseDouble(in)) * 12 + Double.parseDouble(ft)) 
      - (4.6756 * Double.parseDouble(age))) * 1.2); 
    BigDecimal bd = BigDecimal.valueOf(answer); 
    bd = bd.setScale(2, BigDecimal.ROUND_FLOOR); 
    etanswer.setText(bd.toString()); 


    // call for custom toast 
    viewBMRSavedToast(); 
    } 

} // end of calculateWomen method 

請幫我找出我的問題，我是新來的Android編程。任何幫助，將不勝感激。謝謝

Answer 1

我假設你使用微調錯誤的方式有微小的例子。 設置適配器和微調器 int pos = 0; //類變量 List list = new ArrayList（）; Spinner spin =（Spinner）findViewById（R.id.id）; ArrayAdapter adapter = new ArrayAdapter（this， android.R.layout.simple_spinner_item，list）; adapter .setDropDownViewResource（android.R.layout.simple_spinner_dropdown_item）; spinPriceFor.setAdapter（adapter）;

填充列表（你可以填充它befor設置適配器和skipp這一步）

list.add(item); 
runOnUiThread(new Runnable() { 
      public void run() { 
       adapterRegion.notifyDataSetChanged(); 
      } 
     }); 

獲得選擇的元素從微調

spinSettle.setOnItemSelectedListener(new OnItemSelectedListener() { 
      @Override 
      public void onItemSelected(AdapterView<?> parent, View view, 
        int position, long id) { 
       pos=position; 
String a = list.get(pos); //do what ever you want with selected item 
      } 

      @Override 
      public void onNothingSelected(AdapterView<?> arg0) { 
      } 
     }); 

當你需要從spinnerValues第二值

spinnerValues.get(list.get(pos));