如何限制listview中的复选框选择？

我想限制android listivew中的复选框选择，例如只应选择3个复选框，否则应该给出错误消息。

用户可以从列表中选择任意三个复选框任何一个指导我如何实现这个？这里是我的适配器

public class AdapterContacts extends BaseAdapter { 

    private LayoutInflater mInflater; 

    public Context context; 
    public static List<myContacts> contacts; 

    public AdapterContacts(Context context,List<myContacts> list) { 
     mInflater = LayoutInflater.from(context); 
     this.context = context; 
     contacts= list; 
    } 

    public View getView(final int position, View convertView, ViewGroup parent) { 

     ViewHolder holder; 

     if (convertView == null) { 
     convertView = mInflater.inflate(R.layout.list_contacts, null); 
     holder = new ViewHolder(); 
     holder.contactName = (TextView) convertView.findViewById(R.id.contactName); 
     holder.contactNumber = (TextView) convertView.findViewById(R.id.contactNumber); 
     holder.checkBox = (CheckBox) convertView.findViewById(R.id.checkBox); 
     convertView.setTag(holder); 

     } else { 
     holder = (ViewHolder) convertView.getTag(); 
     } 

     myContacts contact = getItem(position); 
     holder.checkBox.setOnCheckedChangeListener(new OnCheckedChangeListener() { 

      @Override 
      public void onCheckedChanged(CompoundButton checkboxView, boolean isChecked) { 
       myContacts c = (myContacts) checkboxView.getTag(); 
       c.setSelected(isChecked); 
       // to put that check of selection limit with error 


      } 
     }); 


     holder.checkBox.setTag(contact); 
     holder.checkBox.setChecked(contact.isSelected()); 



     holder.contactName.setText(contact.getContactName()); 
     holder.contactNumber.setText(contact.getPhoneNumber()); 

     return convertView; 

     } 

    @Override 
    public int getCount() { 
     return contacts.size(); 
    } 

    @Override 
    public myContacts getItem(int position) { 
     return contacts.get(position); 
    } 

    @Override 
    public long getItemId(int arg0) { 
     return 0; 
    } 


    class ViewHolder { 
     TextView contactName; 
     TextView contactNumber; 
     CheckBox checkBox; 
     } 




}

任何帮助，将不胜感激。

来源

2011-05-27 UMAR

最后我解决了这个问题:)这里作为globalInc是默认值全局变量0

holder.checkBox.setOnCheckedChangeListener(new OnCheckedChangeListener() 
     { 

      @Override 
      public void onCheckedChanged(CompoundButton checkboxView, boolean isChecked) 
      { 
       myContacts c = (myContacts) checkboxView.getTag(); 

       if(isChecked) 
       { 
        globalInc++; 
       } 
       else if(!isChecked) 
       { 
        globalInc--; 
       } 
       if(globalInc >= 4)// it will allow 3 checkboxes only 
       { 
        Toast.makeText(context, "Error = " + globalInc, Toast.LENGTH_LONG).show(); 
        checkboxView.setChecked(false); 
        globalInc--; 
       } 
       else 
       { 
        c.setSelected(isChecked); 
       } 
       System.out.println(" --------------- "+globalInc); 
      } 
     });

来源

2011-05-27 12:16:23 UMAR

没有它的不能正常工作，滚动listview用户后，也可以再次选择超过3复选框ex – 2014-05-06 06:06:33

它显示classCastException bcoz gettag返回Integer.How解决这个问题？ @UMAR – Pankaj 2014-08-22 09:50:38

采取静态诠释计数变量和使用这些条件

holder.checkBox.isChecked（）递增，如果它为真，则在计数递增然后检查计数> 3然后显示弹出到用户

我希望这是帮助。

来源

2011-05-27 08:26:47 DynamicMind

第一件事就是，要测试当前checkBox是否被选中，如果被选中，则测试计数器是否大于等于3，否则（复选框未选中，然后递减计数器:) – Houcine 2011-05-27 08:46:41

仍然不是工作......我在一个单独的类中使用适配器可能是我使用它的静态变量的问题？ – UMAR 2011-05-27 09:14:15

int globalInc = 0; 
boolean isCheckGlobal = false; 

ArrayList<Integer> checkings = new ArrayList<Integer>(); 

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

    ViewHolder viewHolder = null; 
    if (convertView == null) { 
     LayoutInflater inflator = context.getLayoutInflater(); 
     convertView = inflator.inflate(R.layout.list_inner, null); 
     viewHolder = new ViewHolder(); 
     viewHolder.friendName = (TextView) convertView 
       .findViewById(R.id.friendName); 

     viewHolder.checkbox = (CheckBox) convertView 
       .findViewById(R.id.checkbox); 

     final MyAdapterSecond objectMyAdapter = new MyAdapterSecond(); 

     viewHolder.checkbox.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 

       int getPositionInClick = (Integer) v.getTag(); 


       if (isCheckGlobal == false) { 
        if (checkings.contains(getPositionInClick)) { 
         globalInc--; 
         checkings.remove(checkings.indexOf(getPositionInClick)); 
               } else { 
         objectMyAdapter.getCheck(false); 
        } 
       } else if (isCheckGlobal == true) { 
              if (checkings.size() < 4) { 
         globalInc++; 
        } 

       } 
      } 
     }); 

     viewHolder.checkbox 
       .setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { 

        @Override 
        public void onCheckedChanged(CompoundButton buttonView, 
          boolean isChecked) { 
         int getPosition = (Integer) buttonView.getTag(); 



         list.get(getPosition).setSelected(
           buttonView.isChecked());        

         callCheck(buttonView, "hi1"); 
         if (checkings.size() > 4       { 
          Toast.makeText(context, "Error = " + globalInc, 
            Toast.LENGTH_LONG).show(); 
                  objectMyAdapter.setCheck(buttonView); 
          isCheckGlobal = false; 


         } else { 
          buttonView.setSelected(isChecked); 
          if (isChecked 
            && (!checkings.contains(getPosition))) { 
           checkings.add(getPosition); 
                   } 
          else if(!isChecked){ 
           if(checkings.contains(getPosition)){ 
            checkings.remove(checkings.indexOf(getPosition)); 
           } 
          } 
          isCheckGlobal = true; 
                 } 

        } 
       }); 
     convertView.setTag(viewHolder); 
     convertView.setTag(R.id.friendName, viewHolder.friendName); 

     convertView.setTag(R.id.checkbox, viewHolder.checkbox); 
    } else { 
     viewHolder = (ViewHolder) convertView.getTag(); 
    } 
    viewHolder.checkbox.setTag(position); // This line is important. 

    viewHolder.friendName.setText(list.get(position).getname()); 

      viewHolder.checkbox.setChecked(list.get(position).isSelected()); 

    return convertView; 

} 


class MyAdapterSecond { 
    CompoundButton buttonView; 

    public void setCheck(CompoundButton buttonView) { 
     this.buttonView = buttonView; 
    } 

    public void getCheck(boolean flag) { 
     this.buttonView.setChecked(flag); 
    } 
}

来源

2013-03-23 07:34:07

试试这个：

public class AccountListAdapter extends BaseAdapter { 

@SuppressWarnings("unused") 
private final static String TAG = AccountListAdapter.class.getSimpleName(); 

private Context context; 
private List<Account> rowItems; 

private int selectedItemCounter = 0; 

private final int limit; 

public AccountListAdapter(Context context, List<Account> items, int limit) { 
    this.context = context; 
    this.rowItems = items; 
    this.limit = limit; 
} 

public View getView(final int position, View convertView, ViewGroup parent) { 

    LayoutInflater mInflater = (LayoutInflater) context 
      .getSystemService(Activity.LAYOUT_INFLATER_SERVICE); 

    final Account rowItem = (Account) getItem(position); 

    convertView = mInflater.inflate(R.layout.account_selection_item, null); 

    TextView tv = (TextView) convertView.findViewById(R.id.textView); 
    ToggleButton tb = (ToggleButton) convertView 
      .findViewById(R.id.toggleButton); 

    tb.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { 

     @Override 
     public void onCheckedChanged(CompoundButton buttonView, 
       boolean isChecked) { 

      if (isChecked && !rowItem.isSelected()) { 

       if (selectedItemCounter >= limit) { 
        Toast.makeText(context, 
          "can't be more" + selectedItemCounter, 
          Toast.LENGTH_SHORT).show(); 
        buttonView.setChecked(false); 
        return; 
       } 

       rowItem.setSelected(true); 
       selectedItemCounter++; 
      } else if (!isChecked && rowItem.isSelected()) { 
       rowItem.setSelected(false); 
       selectedItemCounter--; 
      } 

     } 
    }); 

    tv.setText(rowItem.getDevId()); 
    tb.setChecked(rowItem.isSelected()); 

    return convertView; 
} 

@Override 
public int getCount() { 
    return rowItems.size(); 
} 

@Override 
public Object getItem(int position) { 
    return rowItems.get(position); 
} 

@Override 
public long getItemId(int position) { 
    return rowItems.indexOf(getItem(position)); 
} 
}

试图改善我的ViewHolder模式的代码，但失败。如果有人有更好的主意，请让我知道。

来源

2014-07-01 06:23:38 Paparika

我没有回答类似的问题从http://stackoverflow.com/questions/24497827/set-limit-on-listview-multiple-section-mode/24503580#24503580在这里重复它是错误的吗？ – Paparika 2014-07-01 06:26:03

如何限制listview中的复选框选择？

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