無法獲得微調器的值並且無法找到空值的值

Question

我創建了幾個單位的轉換器。我用spinners來選擇要轉換的單位，但在我設置適配器的方法，當我設置和詳細說明它沒有考慮如果只從工作中放置它沒有采取確切的價值和顯示空白我不明白在哪裏的錯誤是。任何人都可以請幫忙。它需要很多時間。

Uniqcon：

public class UniqueConverter extends Fragment { 

    private Spinner fromDetails, toDetails; 
    private EditText fromInput, toInput; 




    public static UniqueConverter setArguments(int position) { 
     UniqueConverter uniqueConverter = new UniqueConverter(); 
     Bundle args = new Bundle(); 
     args.putInt("position", position); 
     uniqueConverter.setArguments(args); 
     return uniqueConverter; 
    } 

    @Nullable 
    @Override 
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { 
     View view = inflater.inflate(R.layout.fragment_uniquelayout, container, false); 



     fromInput.addTextChangedListener(new TextWatcher() { 
      @Override 
      public void beforeTextChanged(CharSequence s, int start, int count, int after) { 

      } 

      @Override 
      public void onTextChanged(CharSequence s, int start, int before, int count) { 

      } 

      @Override 
      public void afterTextChanged(Editable s) { 

       Double inp; 
       double out = 0; 

       if (!fromInput.getText().toString().equals("")) 
       { 
        String ifrom = (String) fromDetails.getSelectedItem(); 
        String rto = (String) toDetails.getSelectedItem(); 
        inp = Double.valueOf(fromInput.getText().toString()); 
        int position = getArguments().getInt("position"); 
        switch (position) 
        { 
         case 0: 
          setAdapter(getResources().getStringArray(R.array.temperatureform), "Celsius", "Fahrenheit"); 
          TemperatureConverter con = new TemperatureConverter(); 
          TemperatureConverter.Units fromUnit = TemperatureConverter.Units.fromString(ifrom); 
          TemperatureConverter.Units toUnit = TemperatureConverter.Units.fromString(rto); 
          out = con.TemperatureConvert(fromUnit,toUnit,inp); 
          break; 
         case 1: 
          setAdapter(getResources().getStringArray(R.array.weightform), "Kilograms", "Grams"); 
          WeightConverter converter = new WeightConverter(); 
          WeightConverter.Inus fromInus = WeightConverter.Inus.fromString(ifrom); 
          WeightConverter.Inus toInus = WeightConverter.Inus.fromString(rto); 
          out = converter.WeightConvert(fromInus,toInus,inp); 
          break; 
} 

        toInput.setText(String.valueOf(out)); 

       }else { 
        toInput.setText(""); 
       } 
      } 
     }); 


     onInitVies(view); 


     return view; 
    } 

    private void setAdapter(String[] spinnerItems, String fromDefaultText, String toDefaultText) { 
     fromDetails.setAdapter(new CustomSpinnerAdapter(getContext(), R.layout.spinner_item, spinnerItems, fromDefaultText)); 
     toDetails.setAdapter(new CustomSpinnerAdapter(getContext(),R.layout.spinner_item,spinnerItems,toDefaultText)); 
    } 

    private void onInitVies(View view) { 
     fromDetails = (Spinner) view.findViewById(R.id.fromSpinner); 
     toDetails = (Spinner) view.findViewById(R.id.toSpinner); 

     fromInput = (EditText) view.findViewById(R.id.fromInput); 
     toInput = (EditText) view.findViewById(R.id.toInput); 
    } 

字符串數組：

<string-array name="temperatureform"> 
     <item name="c">Celsius</item> 
     <item name="f">Fahrenheit</item> 
     <item name="k">Kelvin</item> 
</string-array> 

<string-array name="weightform"> 
     <item name="kg">Kilograms</item> 
     <item name="g">Grams</item> 
     <item name="lb">Pounds</item> 
</string-array> 

的logcat：

Exception dispatching finished signal. 
03-15 02:40:25.843 14349-14349/com.cloudicalabs.converters E/MessageQueue-JNI: Exception in MessageQueue callback: handleReceiveCallback 
03-15 02:40:25.844 14349-14349/com.cloudicalabs.converters E/MessageQueue-JNI: java.lang.IllegalArgumentException: Cannot find a value for null 
03-15 02:40:25.844 14349-14349/com.cloudicalabs.converters E/MessageQueue-JNI:  at com.cloudicalabs.converters.datahandlers.WeightConverter$Inus.fromString(WeightConverter.java:26) 
03-15 02:40:25.844 14349-14349/com.cloudicalabs.converters E/MessageQueue-JNI:  at com.cloudicalabs.converters.fragments.UniqueConverter$1.afterTextChanged(UniqueConverter.java:95) 
03-15 02:40:25.844 14349-14349/com.cloudicalabs.converters E/MessageQueue-JNI:  at android.widget.TextView.sendAfterTextChanged(TextView.java:8007) 
03-15 02:40:25.844 14349-14349/com.cloudicalabs.converters E/MessageQueue-JNI:  at android.widget.TextView$ChangeWatcher.afterTextChanged(TextView.java:10168) 
03-15 02:40:25.844 14349-14349/com.cloudicalabs.converters E/MessageQueue-JNI:  at android.text.SpannableStringBuilder.sendAfterTextChanged(SpannableStringBuilder.java:1043) 
03-15 02:40:25.844 14349-14349/com.cloudicalabs.converters E/MessageQueue-JNI:  at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:560) 
03-15 02:40:25.844 14349-14349/com.cloudicalabs.converters E/MessageQueue-JNI:  at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:492) 
03-15 02:40:25.844 14349-14349/com.cloudicalabs.converters E/MessageQueue-JNI:  at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:491) 
03-15 02:40:25.844 14349-14349/com.cloudicalabs.converters E/MessageQueue-JNI:  at android.text.method.NumberKeyListener.onKeyDown(NumberKeyListener.java:121) 
03-15 02:40:25.844 14349-14349/com.cloudicalabs.converters E/MessageQueue-JNI:  at android.widget.TextView.doKeyDown(TextView.java:6098) 
03-15 02:40:25.844 14349-14349/com.cloudicalabs.converters E/MessageQueue-JNI:  at android.widget.TextView.onKeyDown(TextView.java:5911) 
03-15 02:40:25.844 14349-14349/com.cloudicalabs.converters E/MessageQueue-JNI:  at android.view.KeyEvent.dispatch(KeyEvent.java:2640) 
03-15 02:40:25.844 14349-14349/com.cloudicalabs.converters E/MessageQueue-JNI:  at android.view.View.dispatchKeyEvent(View.java:9234) 
03-15 02:40:25.844 14349-14349/com.cloudicalabs.converters E/MessageQueue-JNI:  at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1640) 
03-15 02:40:25.844 14349-14349/com.cloudicalabs.converters E/MessageQueue-JNI:  at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1640) 
03-15 02:40:25.844 14349-14349/com.cloudicalabs.converters E/MessageQueue-JNI:  at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1640) 
03-15 02:40:25.844 14349-14349/com.cloudicalabs.converters E/MessageQueue-JNI:  at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1640) 
03-15 02:40:25.844 14349-14349/com.cloudicalabs.converters E/MessageQueue-JNI:  at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1640) 
03-15 02:40:25.844 14349-14349/com.cloudicalabs.converters E/MessageQueue-JNI:  at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1640) 
03-15 02:40:25.844 14349-14349/com.cloudicalabs.converters E/MessageQueue-JNI:  at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1640) 

Answer 1

你好，親愛的嘗試這個這個，不要使用直接

String[] temperatureform,weightform ; 
temperatureform =getResources().getStringArray(R.array.weightform); 
weightform=getResources().getStringArray(R.array.weightform); 
setAdapter(temperatureform,"Celsius", "Fahrenheit"); 
setAdapter(weightform ,"Celsius", "Fahrenheit");