Question

我有自定义列表视图，其中包含复选框和Textview。由于某些原因，我无法使用ListActivity。好吧，它很容易使用listview，但我不知道为什么Check框的行为不同。

首先让我告诉你我在做什么，下面是我的适配器的一部分

 private static class ViewHolder { //My View Hold
    TextView tvParentGradeName;
    CheckBox cbParentClassesOfGrades;

}
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // Get the data item for this position
        final ClassModelInfo user = getItem(position);


        // Check if an existing view is being reused, otherwise inflate the view
        final ViewHolder viewHolder; // view lookup cache stored in tag
        if (convertView == null) {
            // If there's no view to re-use, inflate a brand new view for row
            viewHolder = new ViewHolder();
            LayoutInflater inflater = LayoutInflater.from(mContext);
            convertView = inflater.inflate(resourceLayout, parent, false);

            viewHolder.tvParentGradeName = (TextView) convertView.findViewById(R.id.tvParentGradeName);
            viewHolder.cbParentClassesOfGrades = (CheckBox) convertView.findViewById(R.id.cbParentClassesOfGrades);


            convertView.setTag(viewHolder);

            viewHolder.cbParentClassesOfGrades.setChecked(false);
            //Following list consist of ids of items whoes check box are checked alredy 
            if(selectedItemsList!= null && selectedItemsList.size()>0){
                for(int i = 0 ; i<selectedItemsList.size();i++){
                if(user.getClassID().matches(""+selectedItemsList.get(i))){
                    viewHolder.cbParentClassesOfGrades.setChecked(true);
                }
                }

            }

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

                @Override
                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                    int getPosition = (Integer) buttonView.getTag();  // Here we get the position that we have set for the checkbox using setTag.
                    listClass.get(getPosition).setSetSelected(buttonView.isChecked()); // Set the value of checkbox to maintain its state.
//                    if(callback!=null)
//                    callback.checkBoxChecked();
                    if (isChecked) {


                        selectedItemsList.add(Integer.parseInt(user.getClassID()));

                    } else {
//                            selectedItemsList.remove(classsLevelClickedItems.getId());
                        Iterator<Integer> myItr = selectedItemsList.iterator();

                        while (myItr.hasNext()) {
                            Integer id = myItr.next();
                            System.out.println("Next name is: " + id);
                            if (id == Integer.parseInt(user.getClassID())) {
                                myItr.remove();
                            }
                        }
                    }
                }
            });


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


            viewHolder.tvParentGradeName.setText(user.getClassName()+" ("+gradeDictionary.get(Integer.parseInt(user.getGradeID()))+")");

            viewHolder.cbParentClassesOfGrades.setChecked(user.isSetSelected());


        return convertView;

    }

**现在，如果我删除以下行，则复选框行为会变得奇怪，例如，如果我选中第4个复选框，并开始滚动列表视图，我会看到已经检查过的复选框，我不知道这种行为是什么**

viewHolder.cbParentClassesOfGrades.setTag（位置）; //这条线很重要 viewHolder.tvParentGradeName.setText（user.getClassName（）+“＆gt;（”+ gradeDictionary.get（Integer.parseInt（user.getGradeID（）））+“）”）; viewHolder.cbParentClassesOfGrades.setChecked（user.isSetSelected（））;

所以基本上正如我之前提到的，我上面提到的最大问题是一些问题

1）如何使用复选框创建一致的列表视图，我的意思是listview应该记住单击了哪个复选框

2）如何在listview的整行上创建点击监听器，这将帮助用户点击该项并标记复选框（选中并取消选中），这样用户就无需专门勾选复选框。

请告诉我如何改善这一点？这是我的日子。

注意：我已经搜索了这个问题很多，在我的代码中，带注释的行是我从网上复制的行。

Answer 1

您需要跟踪已检查和未检查的位置，并将其标记为您的采用者。在列表视图中，它是期望的行为。你必须在代码中处理它。为列表项创建一个数组，当单击一个复选框时，更新该位置的数组，并在适配器标记中选中/取消选中数组的相应值。

 public class MyCustomAdapter extends ArrayAdapter<ApplicationInfo>  {

private List<ApplicationInfo> appInfoList;
private LayoutInflater mInflater;
private PackageManager pm;
ArrayList<Boolean> positionArray;
private Context ctx;
int[] visiblePosArray;
private volatile int positionCheck; 

public MyCustomAdapter(Context context, List<ApplicationInfo> myList) {
    super(context, NO_SELECTION);
    appInfoList = myList;
    ctx=context;
    mInflater =     (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    pm = context.getPackageManager();

    positionArray = new ArrayList<Boolean>(myList.size());
    for(int i =0;i<myList.size();i++){
        positionArray.add(false);
    }
}
@Override
public int getCount() {
    // TODO Auto-generated method stub
    return appInfoList.size();
}

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

    View row = convertView;
    Holder holder = null;

    if(row==null){
        row = mInflater.inflate(R.layout.testlayout, null); 
        //  visiblePosArray[position%visiblePosArray.length]=position;
        holder = new Holder();
        holder.appIcon = (ImageView)row.findViewById(R.id.imageView1);

        holder.ckbox =(CheckBox)row.findViewById(R.id.checkBox1);

        row.setTag(holder);
    } else {

        holder = (Holder) convertView.getTag();
    holder.ckbox.setOnCheckedChangeListener(null);

    }

    holder.ckbox.setFocusable(false);
    holder.appIcon.setImageDrawable(appInfoList.get(position).loadIcon(pm));
    holder.ckbox.setChecked(positionArray.get(position));
    holder.ckbox.setText(appInfoList.get(position).loadLabel(pm));
    holder.ckbox.setOnCheckedChangeListener(new OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if(isChecked ){
            System.out.println(position+"--- :)");
                positionArray.set(position, true);

            }else
                positionArray.set(position, false);
        }
    });

    return row;
}
static class Holder
{
    ImageView appIcon;
    CheckBox ckbox;

}
}

列表视图中的Android复选框非预期行为

1 个答案: