Question

我正在尝试获取已检查的值，但它没有显示值，我已经实现了自定义适配器，我没有得到如何更新位置

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;
    }

我正在活动

中声明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

列表视图项内的任何可点击视图都会窃取列表视图onItemClickListener click。

如果要在复选框上捕获检查事件，则应使用CompoundButton.OnCheckedChangeListener而不是View.OnClickListener。

由于ListView上的convertView可重复使用，因此您必须意识到您的数据不准确。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。如果你想获得检查值，你可以从checkedHolder

获得

在checkedHolder中，您可以获取用户选择的任何项目的位置，然后您可以调用活动中的以下代码

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
}

Answer 2

查看我的代码。我使用这种方式从listview获取选中的项目：

public class MovieAdapter extends ArrayAdapter<MovieVO>{

    Context context;
    List<MovieVO> movieList;
    public MovieAdapter(Context context, int resource, List<MovieVO> objects) {
        super(context, resource, objects);
        this.context = context;
        movieList = objects;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.list_row, null);
        TextView tvMovieName = (TextView) convertView.findViewById(R.id.tvMovieName);
        TextView tvRating = (TextView) convertView.findViewById(R.id.tvRating);
        TextView tvGenre = (TextView) convertView.findViewById(R.id.tvGenre);
        TextView tvYear = (TextView) convertView.findViewById(R.id.tvYear);
        ImageView ivImage = (ImageView) convertView.findViewById(R.id.ivImage);
        CheckBox cbSelect = (CheckBox) convertView.findViewById(R.id.cbSelect);

        if(movieList.get(position).isSelected())
        {
            cbSelect.setChecked(true);
        }
        else
        {
            cbSelect.setChecked(false);
        }

        cbSelect.setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if(isChecked)
                {
                    movieList.get(position).setSelected(true);
                }
                else
                {
                    movieList.get(position).setSelected(false);
                }
            }
        });

        tvMovieName.setText(movieList.get(position).getName());
        tvRating.setText(movieList.get(position).getRating());
        tvGenre.setText(Arrays.toString(movieList.get(position).getGenre()).replace("[", "").replace("]", ""));
        tvYear.setText(movieList.get(position).getYear());
        Picasso.with(context).load(movieList.get(position).getImageUrl()).into(ivImage);
        return convertView;
    }

在这里，我根据项目检查添加true或false值并取消选中。如果希望列表中的所有选定值，则只需迭代列表并检查真假值。

如何使用自定义适配器和列表视图获取复选框值

2 个答案: