android - 如何使用自定义适配器和 ListView 获取复选框值

Question

我正在尝试获取选中的值，但它没有显示该值，我已经在那里实现了自定义适配器，但我不知道如何更新位置

我的代码是..

   public Add_member_adapter(Context a, ArrayList<ItemsModel> d) {

        context = a;
        data = d;
        itemChecked = new boolean[data.size()];

        inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    }

    public int getCount() {
        if (data.size() <= 0)
            return 1;
        return data.size();
    }

    public final Object getItem(int position) {
        return data.get(getCount() - position - 1);
    }

    public final long getItemId(int position) {
        return position;
    }

    public static class ViewHolder {

        public TextView Name, UserId_Fk;
        CheckBox chkbox;

    }

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

        Log.d("getview:", "position=" + position);
        vi = convertView;
        final ViewHolder holder;

        if (convertView == null) {

            vi = inflater.inflate(R.layout.add_members_list_item, null);
            holder = new ViewHolder();

            holder.Name = (TextView) vi.findViewById(R.id.Name);
            holder.UserId_Fk = (TextView) vi.findViewById(R.id.CusId_Fk);
            holder.chkbox = (CheckBox) vi.findViewById(R.id.chkbox);

            vi.setTag(holder);
        } else {

            holder = (ViewHolder) vi.getTag();

        }
        if (data.size() <= 0) {

            vi.setVisibility(View.GONE);

        } else {

            tempValues = null;
            tempValues = (ItemsModel) data.get(position);

            holder.Name.setText(tempValues.getItemName().toString());
            holder.UserId_Fk.setText(tempValues.getUserId_Fk().toString());
            holder.chkbox.setChecked(false);



            holder.chkbox.setChecked(itemChecked[position]);

            holder.chkbox
                    .setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                        @Override
                        public void onCheckedChanged(CompoundButton buttonView,
                                boolean isChecked) {
                            itemChecked[position] = isChecked;
                        }
                    });
        }
        return vi;
    }

我正在声明另一个 Activity 中的 List setOnItemClickListener

list.setOnItemClickListener(new OnItemClickListener() {

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

                CheckBox checkbox = ((CheckBox) view.findViewById(R.id.chkbox));

                String Name = list.getItemAtPosition(position).toString();



            }

        });

Answer 1

ListView 项内的任何可点击 View 都会窃取 ListView onItemClickListener 点击。

如果你想在你的复选框上捕获检查事件，你应该使用 CompoundButton.OnCheckedChangeListener 而不是 View.OnClickListener。

由于 ListView 上的 convertView 是可重复使用的，您必须意识到您的数据将不准确。您必须创建一个数据集来保存您想要保留的值。

此代码来自您的适配器

public View getView(final int position, View convertView, ViewGroup parent) {
        Log.d("getview:", "position=" + position);
        vi = convertView;
        final ViewHolder holder;

        if (convertView == null) {

            vi = inflater.inflate(R.layout.add_members_list_item, null);
            holder = new ViewHolder();

            holder.Name = (TextView) vi.findViewById(R.id.Name);
            holder.UserId_Fk = (TextView) vi.findViewById(R.id.CusId_Fk);
            holder.chkbox = (CheckBox) vi.findViewById(R.id.chkbox);

            vi.setTag(holder);
        } else {

            holder = (ViewHolder) vi.getTag();

        }
        if (data.size() <= 0) {

            vi.setVisibility(View.GONE);

        } else {

            tempValues = null;
            tempValues = (ItemsModel) data.get(position);

            holder.Name.setText(tempValues.getItemName().toString());
            holder.UserId_Fk.setText(tempValues.getUserId_Fk().toString());

            holder.chkbox.setChecked(checkedHolder[position]);

            holder.chkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                @Override
                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                    checkedHolder[position] = isChecked;
                }
            });
        }
        return vi;
    }

    public boolean[] checkedHolder;

    private void createCheckedHolder() {
        checkedHolder = new boolean[getCount()];
    }

在适配器的构造函数上调用 createCheckedHolder。而如果想获取checked值，可以从checkedHolder中获取

从 checkedHolder 中，您可以获取用户选择的任何项目的位置，然后您可以从您的 Activity 中调用以下代码

private ArrayList<String> getSelectedNames(){
List<String> names = new ArrayList<String>();
for (int i = 0; i < adapter.getCount(); i++) {
                if(adapter.checkedHolder[i]){
                    //get all name values that checked by user
                    names.get(i).add(yourDataSet.getItemName().toString());
                }
            }
return names
}