Android:Listview 不保存复选框的状态

Question

我检查了所有有类似问题的主题，但我仍然停留在死点。我有一个带有联系人列表的 ListView ，但是当我向下滚动和向上滚动 ListView 时，不保存我的选择状态。所有复选框都设置为 false。当我调试时，我看到，当我滚动 ListView 时，我的 onClickListener 认为复选框已签名并重置它。我做了所有事情，其他带有位置 bool 值的数组等等，但我仍然不知道该怎么做:(我将非常感谢任何帮助:)

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        readContacts();
        Contact_Database dbhandler = new Contact_Database(
                getApplicationContext(), null, null, 1);
        numbers.addAll( dbhandler.getAllNumbers());
        System.out.println("onCreate");
        ListView lv = getListView();
        registerForContextMenu(lv);
        lv.setTextFilterEnabled(true);
        lv.clearChoices();
        MyAdapter adapter = (new MyAdapter(this, R.layout.contact_list_sms, contacts));
        adapter.notifyDataSetChanged();
        lv.setAdapter(adapter);

    }

    /**
     * When I destroy intent i send request to database, faster!
     */

    @Override
    protected void onDestroy() {
        super.onDestroy();
        for (int i = 0; i < numbers.size(); ++i)
            System.out.println("@@@@" + numbers.get(i));

        swap_contacts();

    }

class MyAdapter extends ArrayAdapter<Contact> {

        LayoutInflater inflat;

        public MyAdapter(Context context, int textViewResourceId,
                ArrayList<Contact> objects) {
            super(context, textViewResourceId, objects);
            inflat = LayoutInflater.from(context);
            System.out.println("LOLLLLL");
            notifyDataSetChanged();

        }

        @Override
        public int getItemViewType(int position) {
            return (position == this.getCount() - 1) ? 1 : 0;
        }

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

        // if that contact exist in database? numbers, in onCreate method
        // i init this with saved position from databse
        private boolean exist(String x) {
            for (int i = 0; i < numbers.size(); i++)
                if (numbers.get(i).compareTo(x) == 0)
                    return true;
            return false;
        }

        @SuppressLint("NewApi")
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            System.out.println("ROWS !!! ->" + numbers.size());
            ViewHolder holder = null;
            if (convertView == null) {
                holder = new ViewHolder();
                convertView = inflat.inflate(R.layout.contact_row, null);
                holder.textView1 = (TextView) convertView
                        .findViewById(R.id.name);
                holder.textView2 = (TextView) convertView
                        .findViewById(R.id.number);
                holder.on_off = (CheckBox) convertView
                        .findViewById(R.id.enable);
                convertView.setTag(holder);
            } else {
                holder = (ViewHolder) convertView.getTag();
            }
            Contact it = contacts.get(position);
            Log.v("XXX", holder.toString());
            if (it != null) {
                holder.textView1.setText(contacts.get(position).name);
                holder.textView2.setText(contacts.get(position).phone);
                // update state of checbox from database
                if (exist(contacts.get(position).phone))
                    holder.on_off.setChecked(true);
                else
                    holder.on_off.setChecked(false);
            }

            final int element_position = position;

            holder.on_off
                    .setOnCheckedChangeListener(new OnCheckedChangeListener() {
                        // update list when we click on it
                        @Override
                        public void onCheckedChanged(CompoundButton buttonView,
                                boolean isChecked) {
                            String nr_telefonu = contacts.get(element_position).phone;
                            if (isChecked) {
                                numbers.add(nr_telefonu);
                            } else {
                                numbers.remove(nr_telefonu);
                            }
                        }
                    });
            return convertView;
        }


        @Override
        public Contact getItem(int position) {
            return contacts.get(position);
        }

        private class ViewHolder {
            TextView textView1, textView2;
            CheckBox on_off;

            public String toString() {
                return "-";
            }
        }
    }

Answer 1

列表在滚动时不会保存它的状态，因为每次都会为行项目创建新对象。因此，您需要在 Pojo 类(Setter 和 getter)的帮助下显式保存 CheckBox 的状态。

在 getView() 方法中，您需要检查每个复选框的值。

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

并且在 setOnCheckedChangeListener 上你需要保存复选框的状态

                  holder.on_off
                    .setOnCheckedChangeListener(new OnCheckedChangeListener() {
                        // update list when we click on it
                        @Override
                        public void onCheckedChanged(CompoundButton buttonView,
                                boolean isChecked) {
                        // need to save the state

更多细节请引用下面的博客

http://amitandroid.blogspot.in/2013/03/android-listview-with-checkbox-and.html

您可以根据自己的需要进行更改。