ListView.getCheckedItemPositions无法返回检查项目在SparseBooleanArray [英] ListView.getCheckedItemPositions not able to return checked Items in SparseBooleanArray

问题描述

我米试图读取与多个复选框 A列表中的联系人，但是当我打电话 sparsebooleanarray 。 。它只是返回false，所有列表条目，..即使是一个S检查......我看着这个线程<一个href="http://stackoverflow.com/questions/3996938/why-is-listview-getcheckeditempositions-not-returning-correct-values">Why是ListView.getCheckedItemPositions（）没有返回正确的价值观？ ......但是，当我实现addClickHandlerToCheckBox它迫使stops..this一直缠着我要4 days..pl​​ease任何帮助。

 公共无效populateContactList（）{
    //构建适配器的联系人条目
    最后光标光标= getContacts（）;
    的String []字段=新的String [] {
            ContactsContract.Data.DISPLAY_NAME
    };

    SimpleCursorAdapter适配器=新SimpleCursorAdapter（这一点，R.layout.contact_entry，光标，
            领域，新的INT [] {R.id.contactEntryText}）;
    mContactList.setAdapter（适配器）;
    mContactList.setChoiceMode（ListView.CHOICE_MODE_MULTIPLE）;



    proceedButton.setOnClickListener（新View.OnClickListener（）{
        公共无效的onClick（视图v）{


            SparseBooleanArray检查= mContactList.getCheckedItemPositions（）;

            INT的len = mContactList.getCount（）;


            的for（int i = 0; I＆LT; LEN;我++）
           {

                如果（checked.get（我）==真）
                {

                    字符串项= mContactList.getAdapter（）的getItem（checked.keyAt（I））的toString（）。
                    edt.append（，+项目）;

                }


            }
        }



    }）;
}
 

解决方案

我认为你应该使用适配器列表视图。

它会给一个onCheckedChanged监听器，所以你也将获得的位置。

像...

  holder.checkBox.setOnCheckedChangeListener（新OnCheckedChangeListener（）{

            @覆盖
            公共无效onCheckedChanged（CompoundButton buttonView，布尔器isChecked）{
                INT cupos =位置+ 1;

            }
        }）;
 

现在看整个例如：

  Listview.setAdapter（新settingsBase（getApplicationContext（）））;

私有类settingsBase扩展了BaseAdapter {

    公共settingsBase（上下文的背景下）{
       layoutInflater = LayoutInflater.from（上下文）;
    }

    @覆盖
    公众诠释getCount将（）{
        返回listview.length;
    }

    @覆盖
    公共对象的getItem（INT位置）{
        返回的位置;
    }

    @覆盖
    众长getItemId（INT位置）{
        返回的位置;
    }

    @覆盖
    公共查看getView（最终诠释的立场，观点convertView，ViewGroup中父）{
        ViewHolder持有人;
     holder.checkBox.setOnCheckedChangeListener（新OnCheckedChangeListener（）{

            @覆盖
            公共无效onCheckedChanged（CompoundButton buttonView，布尔器isChecked）{
                INT cupos =位置+ 1;

            }
        }）;


        返回convertView;
    }

    类ViewHolder {
        TextView的txtSettingname，txtShow;
        单选按钮单选按钮;
    }
}
 

试试这个 - 它会帮助你得到的位置，以及是否检查true或false

I m trying to read the contacts in a list with multiple checkboxes, but when i call the sparsebooleanarray..it just return false for all the list entries,..even for the one s checked ...I looked into this thread Why is ListView.getCheckedItemPositions() not returning correct values? ...But when i implement the addClickHandlerToCheckBox it force stops..this has been bugging me for 4 days..please any help..

 public void populateContactList() {
    // Build adapter with contact entries
    final Cursor cursor = getContacts();
    String[] fields = new String[] {
            ContactsContract.Data.DISPLAY_NAME
    };

    SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.contact_entry, cursor,
            fields, new int[] {R.id.contactEntryText});
    mContactList.setAdapter(adapter);
    mContactList.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);



    proceedButton.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {


            SparseBooleanArray checked=mContactList.getCheckedItemPositions();

            int len = mContactList.getCount();


            for(int i=0;i<len;i++)
           {

                if(checked.get(i)==true)
                {

                    String item =  mContactList.getAdapter().getItem(checked.keyAt(i)).toString();
                    edt.append(","+item);

                }


            }
        }



    });                 
}

解决方案

I think you should use List Adapter view.

It will give an onCheckedChanged listener, so you will also get the position.

Like...

holder.checkBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                int cupos = position+1;

            }
        });         

Now look the whole example:

Listview.setAdapter(new settingsBase(getApplicationContext()));

private class settingsBase extends BaseAdapter{

    public settingsBase(Context context) {
       layoutInflater = LayoutInflater.from(context);
    }

    @Override
    public int getCount() {
        return listview.length;
    }

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

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

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        ViewHolder holder ;
     holder.checkBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                int cupos = position+1;

            }
        });         


        return convertView;
    }

    class ViewHolder{
        TextView txtSettingname , txtShow ;
        RadioButton radioButton ;
    }       
}

Try this--it will help you to get the position and whether checked true or false.

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