如果該位置的項目爲空，則禁用特定複選框

Question

我有一個listView，它包含一個複選框和兩個textViews，它們顯示兩個名爲stName和admissionNumber.On的ArrayList。更多Arraylist我擁有smsMobileNum。一些職位沒有smsMobileNum，所以我想禁用它們。它正在工作，但問題是當我滾動listView然後所有複選框變爲禁用。這裏是我的代碼

public class SmsStudentNameListAdapter extends ArrayAdapter{ 

ArrayList<CheckModelClass> smsMobileNum,userIdList; 
ArrayList<CheckModelClass> stName,admissionNumber; 
ArrayList<String> updatedSmsNumber = new ArrayList<>(), updatedUserId = new ArrayList<>(); 
Context context; 
BaseActivity activity; 
LayoutInflater inflater; 

public SmsStudentNameListAdapter(Context context, BaseActivity activity, ArrayList<CheckModelClass> stName, ArrayList<CheckModelClass> admissionNumber, ArrayList<CheckModelClass> smsMobileNum, ArrayList<CheckModelClass> userIdList, ArrayList<String> updatedSmsNumber, ArrayList<String> updatedUserId) { 
    super(context, R.layout.sms_studentlist,stName); 
    this.stName = stName; 
    this.admissionNumber = admissionNumber; 
    this.context = context; 
    this.activity = activity; 
    this.smsMobileNum = smsMobileNum; 
    this.userIdList = userIdList; 
    this.updatedSmsNumber = updatedSmsNumber; 
    this.updatedUserId = updatedUserId; 
} 

private static class ViewHolder { 

    CheckBox checkBox; 
    TextView studentName, admissionNum; 

} 
@Override 
public View getView(int position, View convertView, ViewGroup parent) { 

    ViewHolder viewHolder = null; 
    if (convertView == null) { 

     LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     convertView = inflater.inflate(R.layout.sms_studentlist, parent, false); 
     viewHolder = new ViewHolder(); 
     viewHolder.studentName = (TextView) convertView.findViewById(R.id.text1); 
     viewHolder.admissionNum = (TextView) convertView.findViewById(R.id.text2); 
     viewHolder.checkBox = (CheckBox) convertView.findViewById(R.id.checkbox); 

     viewHolder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { 
       @Override 
       public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 

        int getPosition = (Integer) buttonView.getTag(); 
        stName.get(getPosition).setSelected(buttonView.isChecked()); 
        if (isChecked) { 
         if (updatedUserId.contains(userIdList.get(getPosition).getName()) && updatedSmsNumber.contains(smsMobileNum.get(getPosition).getName())) { 

         } else { 

          updatedUserId.add(userIdList.get(getPosition).getName()); 
          updatedSmsNumber.add(smsMobileNum.get(getPosition).getName()); 
          } 
         } else { 

          updatedUserId.remove(userIdList.get(getPosition).getName()); 
          updatedSmsNumber.remove(smsMobileNum.get(getPosition).getName()); 
         } 
        } 

     }); 

     convertView.setTag(viewHolder); 
     convertView.setTag(R.id.text1, viewHolder.studentName); 
     convertView.setTag(R.id.text2, viewHolder.admissionNum); 
     convertView.setTag(R.id.checkbox, viewHolder.checkBox); 

    } else { 

     viewHolder = (ViewHolder) convertView.getTag(); 
    } 

    viewHolder.studentName.setText(stName.get(position).getName()); 
    viewHolder.admissionNum.setText(admissionNumber.get(position).getName()); 
    viewHolder.checkBox.setTag(position); 
    viewHolder.checkBox.setChecked(stName.get(position).isSelected()); 

    if(!smsMobileNum.get(position).getName().equals("null")) { 

     viewHolder.checkBox.setChecked(stName.get(position).isSelected()); 
    } 
    else{ 

     viewHolder.checkBox.setEnabled(false); 
    } 

    return convertView; 

} 

}

Answer 1

我想你可以試試這個：

// no relevant code 

    viewHolder.studentName.setText(stName.get(position).getName()); 
    viewHolder.admissionNum.setText(admissionNumber.get(position).getName()); 
    viewHolder.checkBox.setTag(position); 

    boolean isSelected = stName.get(position).isSelected(); 
    String mobileNum = smsMobileNum.get(position).getName(); 

    if(mobileNum.equals("null")) { 
     viewHolder.checkBox.setEnabled(false); 
    } 
    else{ 
     viewHolder.checkBox.setEnabled(true); 
     viewHolder.checkBox.setChecked(isSelected); 
    }