Question

删除项目选中后复选框自动检查下一项。我试图覆盖getcount方法，但没有结果

CountryAdapter.java

CountryAdapter extends ArrayAdapter<MyCountry>{
Context context; int layoutResourceId;  ArrayList<MyCountry> countries; ContextualActionMode activity;
public CountryAdapter(Context context, int layoutResourceId,
        ArrayList<MyCountry> countries) {
}
@Override
public int getCount() { 
    return countries.size();
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
    final MyCountry country = countries.get(position);
    ViewHolder viewHolder = null;
    if(convertView == null) 
    {
        viewHolder = new ViewHolder();
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(layoutResourceId, null);
        viewHolder.nameEn = (TextView) convertView.findViewById(R.id.tvNameEn);
        viewHolder.nameVi = (TextView) convertView.findViewById(R.id.tvNameVi);
        viewHolder.flag = (ImageView) convertView.findViewById(R.id.ivFlag);
        viewHolder.check = (CheckBox) convertView.findViewById(R.id.checkBox1);
        convertView.setTag(viewHolder);
    }
    else 
        viewHolder = (ViewHolder) convertView.getTag();
    viewHolder.nameEn.setText(countries.get(position).getNameEn());
    viewHolder.nameVi.setText(countries.get(position).getNameVi());
    viewHolder.flag.setImageDrawable(countries.get(position).getFlag());
    viewHolder.check.setOnCheckedChangeListener(new OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            count = 0;
            for (MyCountry country : countries) {
                if(country.isCheck()) count++;
            }
            if(isChecked)
            {
                if(activity.actionMode == null || count == 0)
                activity.actionMode = activity.startActionMode(activity.callback);
                count++;
                country.setCheck(true);
            }
            else
            {
                country.setCheck(false);
                count--;
                if(count == 0) activity.actionMode.finish();
            }
        }
    });
    return convertView;
}
int count = 0;
public class ViewHolder{
    TextView nameEn;
    TextView nameVi;
    ImageView flag;
    CheckBox check;
}

ContextualActionMode.java

public class ContextualActionMode extends Activity {

ArrayList<MyCountry> countries = new ArrayList<MyCountry>();
ListView listView;
CountryAdapter adapter;
ActionMode.Callback callback = new ActionMode.Callback() {
    @Override
    public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
        switch (item.getItemId()) {
        case R.id.mnDelete:
            for (int i = 0; i < countries.size(); i++)
            {
                if (countries.get(i).isCheck()) {
                     countries.remove(countries.get(i));
                                   countries.get(i).setChecked(false)
                             }
            }

            adapter.notifyDataSetChanged();
            mode.finish();
            return true;
        default:
            break;
        }
        return false;
    }
};

也许错误在这里，我找到了一些解决方案，但没有任何效果我尝试更改循环，因为列表从0开始索引

//我可以解决它，非常感谢Armaan Stranger

链接到我与我有同样问题的来源 mediafire.com/?agnvic06c69cvw0

并在CountryAdapter.java中编辑

viewHolder.flag.setImageDrawable(countries.get(position).getFlag());
viewHolder.check.setChecked(false); --> right here, i forgot to add set check false as default.
viewHolder.check.setOnCheckedChangeListener(new OnCheckedChangeListener() {

Answer 1

试试这个：

只需在你的onCheckedChanged（）事件之前添加这一行。

viewHolder.nameEn.setText(countries.get(position).getNameEn());
    viewHolder.nameVi.setText(countries.get(position).getNameVi());
    viewHolder.flag.setImageDrawable(countries.get(position).getFlag());
    viewHolder.check.setChecked(false);
    viewHolder.check.setOnCheckedChangeListener(new OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            // TODO Auto-generated method stub
            count = 0;
            for (MyCountry country : countries) {
                if(country.isCheck())
                    count++;
            }
            if(isChecked)
            {
                if(activity.actionMode == null || count == 0)//chua co
                activity.actionMode = activity.startActionMode(activity.callback);
                count++;
                country.setCheck(true);
            }
            else
            {
                country.setCheck(false);
                count--;
                if(count == 0)
                    activity.actionMode.finish();
            }
        }
    });

希望它能帮助!!

Answer 2

您必须在notifyDataSetChanged（）;

之前设置列表视图

public void dellistview（）{ listviewdata.setChoiceMode（ListView.CHOICE_MODE_MULTIPLE）;

    SparseBooleanArray selected = listAdapterData.getCheckedItemPositions();

    if (selected != null) {
        try {

            for (int i = (selected.size() - 1); i >= 0; i--)
            {
                if (selected.valueAt(i)) {

                    String str[] = arrList.get(selected.keyAt(i));
                    fmdbAccess.removelistitm(sourceTable, str[1]);
                    if (arrList != null)
                        arrList.remove(str);

                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        selected.clear();
        arrList = fmdbAccess.getGenricTable(sourceTable, colName);
        if (arrList != null && arrList.size() > 0)
        setListAdapter();

        listAdapterData.notifyDataSetChanged();
      //  finish();
    }

}

Answer 3

请尝试在xml文件中使用android:checked="false"到CheckBox

删除项目后复选框自动检查项目

3 个答案: