如何从Android版的ListView复选框？ [英] How to get checkbox from ListView android?

问题描述

荫使用下面的代码片段正从OnItemClickListener复选框

Iam getting Checkbox from OnItemClickListener by using below snippet

onItemClick(AdapterView<?> parent, View view, int position, long id) {

        Log.w("TAG","onItemClick clicked position :"+position);

        CheckBox cbx = (CheckBox)view.findViewById(R.id.c_checkbox);
        if(cbx.isChecked()){
            Toast.makeText(getApplicationContext(), 
                    "Checked position " + shoppingList.get(position).getItem(), 
                    Toast.LENGTH_SHORT).show();
        }

我需要让所有的位置检查哪个列表项是checked.For的
我用下面的代码片段

I need to get all the positions to check which list item is checked.For that I used below snippet

int firstPosition = list.getFirstVisiblePosition();
             for(int i=firstPosition;i<=list.getCount();i++){
             View v=list.getChildAt(i);
             cbx = (CheckBox)v.findViewById(R.id.c_checkbox);
             if(cbx.isChecked()){
            }
         }

在下面code CBX给我exception.i使用ViewHolder自定义空指针adapter.Please给我solution.why同样的事情在OnItemClickListener工作？

in below code cbx giving me null pointer exception.i used ViewHolder for the custom adapter.Please give me solution.why same thing is worked in OnItemClickListener?

问候，
Rajendar

Regards, Rajendar

推荐答案

它认为它可能是

for(int i=firstPosition;i< **=** list.getCount();i++)

但也只是胡乱猜测。

but that is just a wild guess.

为什么不使用一个可检查的列表视图，然后使用<一个href=\"http://developer.android.com/reference/android/widget/ListView.html#getCheckedItemPositions%28%29\">this?

why not use a checkable listview and then use this?

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