列表視圖中的Spinners

Question

我正在開發一個應用程序來識別樹。因此，我讓用戶通過從微調器中選擇適當的特性來回答關於給定特性的問題。由於一棵樹有很多特徵，我有一個完整的spinners列表。到現在爲止還挺好。不幸的是，只要用戶將它們從屏幕上滾動下來，紡紗廠就會重置。這是至關重要的，我可以避免這一點！

所以：我該如何避免這種情況？

我非常感謝您的幫助！

public class SearchAdapter extends ArrayAdapter<SearchItem>{ 

    SearchAdapter() { 
     super(SearchWizard.this, R.layout.question); 
    } 


    public View getView(int position, View convertView, ViewGroup parent) { 
     View ret = convertView; 

     if (ret == null) { 
      LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      ret = inflater.inflate(R.layout.question, null); 
     } 

     SearchItem item = getItem(position); 
     String question = item.getQuestion(); 

     TextView question_text = (TextView) ret.findViewById(R.id.question_search); 
     assert(question_text != null); 
     question_text.setText(question); 
     Spinner question_spinner = (Spinner) ret.findViewById(R.id.question_spinner); 
     assert(question_spinner != null); 
     question_spinner.setPrompt(question); 
     ArrayAdapter<String> adapter = new ArrayAdapter<String>(SearchWizard.this,android.R.layout.simple_spinner_item, item.getOptions()); 
     adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
     question_spinner.setAdapter(adapter); 
     question_spinner.setOnItemSelectedListener(new MyOnItemSelectedListener(position)); 
     question_spinner.setSelection(2); 

     return ret; 
    } 

} 

enter code herepublic class MyOnItemSelectedListener implements OnItemSelectedListener { 

    public int position; 

    public MyOnItemSelectedListener(int p) { 
     position = p; 
    } 

    public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) { 

     LSsearchCriteria.set(position,Herbalist.encodeoptions(parent.getItemAtPosition(pos).toString())); 

    } 

    public void onNothingSelected(AdapterView<?> parent) { 
     // Do nothing. 
    } 
} 

public class MyOnItemSelectedListener implements OnItemSelectedListener {
 

public int position; 

    public MyOnItemSelectedListener(int p) { 
     position = p; 
    } 

    public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) { 

     LSsearchCriteria.set(position,Herbalist.encodeoptions(parent.getItemAtPosition(pos).toString())); 

    } 

    public void onNothingSelected(AdapterView<?> parent) { 
     // Do nothing. 
    } 
} 

Answer 1

你需要跟蹤紡紗的狀態在一個單獨的數據結構，並在該行再次束縛，用你保存的狀態初始化微調。

Answer 2

改爲使用Spinner.setSelection（i，true）。

榮譽去鷺在 http://sagistech.blogspot.com/2010/12/spinnersetselection-doesnt-work.html