android - 带有节标题和复选框的 ListView

Question

我创建了带有节标题和复选框的 ListView 。除了一个问题，它的工作就像一个魅力。如果我的列表小于屏幕尺寸，那么没问题。如果我的列表长于屏幕大小，比如 20 个或更多，当我选择一个项目时它正在选择该项目，当我滚动时它也会选择其他一些随机项目。我搜索了很多，但找不到解决方案。下面是我的领养人。非常感谢您的帮助。

import java.util.ArrayList;
import java.util.Comparator;
import java.util.HashMap;
import java.util.TreeSet;

import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.provider.Contacts;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.Toast;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.ImageButton;
import android.widget.TextView;

public class SectionHeader extends BaseAdapter {

    private static final int TYPE_ITEM = 0;
    private static final int TYPE_SEPARATOR = 1;
    ViewHolder holder;
    private static int mSelectedItem = -1;

    private ArrayList<String> mData = new ArrayList<String>();
    private TreeSet<Integer> sectionHeader = new TreeSet<Integer>();


    static Boolean checkboxstate1[];
    private LayoutInflater mInflater;

    Boolean selected;
    public void setSelectedItem(int position) {
        mSelectedItem = position;
    }


    public SectionHeader(Context context) {
        mInflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        checkboxstate1=new Boolean[mData.size()];

    }


    public void addItem(final String item) {
        mData.add(item);
        notifyDataSetChanged();
    }

    public void addSectionHeaderItem(final String item) {
        mData.add(item);
        sectionHeader.add(mData.size() - 1);
        notifyDataSetChanged();
    }

    @Override
    public int getItemViewType(int position) {
        return sectionHeader.contains(position) ? TYPE_SEPARATOR : TYPE_ITEM;
    }

    @Override
    public int getViewTypeCount() {
        return 2;
    }

    @Override
    public int getCount() {
        return mData.size();
    }

    @Override
    public String getItem(int position) {
        return mData.get(position);
    }

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

    public View getView(final int position, View convertView, ViewGroup parent) {       
        int rowType = getItemViewType(position);

        if (convertView == null) {
            holder = new ViewHolder();
            switch (rowType) {
            case TYPE_ITEM:

                convertView = mInflater.inflate(R.layout.list_main_item, null);
                holder.textView = (TextView) convertView.findViewById(R.id.list_item);  
                holder.chk = (CheckBox) convertView.findViewById(R.id.checkbox);


                break;
            case TYPE_SEPARATOR:
                convertView = mInflater.inflate(R.layout.list_section_header, null);
                holder.textView = (TextView) convertView.findViewById(R.id.list_header);
                holder.chk = (CheckBox) convertView.findViewById(R.id.checkbox);
                break;
            }
            convertView.setTag(holder);
            convertView.setTag(R.id.list_main_item, holder.textView);
            convertView.setTag(R.id.checkbox, holder.chk);

        //else condition for getTag
        } else {

            holder = (ViewHolder) convertView.getTag();

        }

        convertView.setTag(holder);

        holder.textView.setText(mData.get(position));


        return convertView;
    }

    public static class ViewHolder {
        public ImageButton imageButton;
        public TextView textView;
        public CheckBox chk;
    }


}

Answer 1

问题是由于您的适配器重用了 CheckBox 对象而没有在 getView(...) 方法中正确设置选中状态。您可以通过将每个列表条目的选中状态存储在 checkboxstate1 数组中，然后在 getView(. ..).

public class SectionHeader extends BaseAdapter {
        private static final int TYPE_ITEM = 0;
        private static final int TYPE_SEPARATOR = 1;

        private static int mSelectedItem = -1;

        private List<String> mData = new ArrayList<String>();
        private List<Boolean> mCheckedState = new ArrayList<Boolean>();
        private Set<Integer> sectionHeader = new HashSet<Integer>();

        private LayoutInflater mInflater;
        private ViewHolder holder;

        Boolean selected; // what is this for?

        public void setSelectedItem(int position) {
            mSelectedItem = position;
            mCheckedState.set(position, true);
        }

        public SectionHeader(Context context) {
            mInflater = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        }

        public void addItem(final String item) {
            mData.add(item);
            mCheckedState.add(false);
            notifyDataSetChanged();
        }

        public void addSectionHeaderItem(final String item) {
            mData.add(item);
            mCheckedState.add(false);
            sectionHeader.add(mData.size() - 1);
            notifyDataSetChanged();
        }

        @Override
        public int getItemViewType(int position) {
            return sectionHeader.contains(position) ? TYPE_SEPARATOR : TYPE_ITEM;
        }

        @Override
        public int getViewTypeCount() {
            return 2;
        }

        @Override
        public int getCount() {
            return mData.size();
        }

        @Override
        public String getItem(int position) {
            return mData.get(position);
        }

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

        public View getView(final int position, View convertView, ViewGroup parent) {       
            int rowType = getItemViewType(position);

            if (convertView == null) {
                holder = new ViewHolder();
                switch (rowType) {
                    case TYPE_ITEM:
                        convertView = mInflater.inflate(R.layout.list_main_item, null);
                        holder.textView = (TextView) convertView.findViewById(R.id.list_item);  
                        holder.chk = (CheckBox) convertView.findViewById(R.id.checkbox);
                        break;
                    case TYPE_SEPARATOR:
                        convertView = mInflater.inflate(R.layout.list_section_header, null);
                        holder.textView = (TextView) convertView.findViewById(R.id.list_header);
                        holder.chk = (CheckBox) convertView.findViewById(R.id.checkbox);
                        break;
                }
                convertView.setTag(holder);
            } else {
                holder = (ViewHolder) convertView.getTag();
            }

            convertView.setTag(holder);
            holder.textView.setText(mData.get(position));
            holder.chk.setChecked(mCheckedState.get(position));

            return convertView;
        }

        static class ViewHolder {
            public ImageButton imageButton;
            public TextView textView;
            public CheckBox chk;
        }
    }