android - ListView 中的 EditText 在 ListView 滚动时丢失内容

Question

我正在开发一款用户可以填写报告和投票的应用程序。在一个 Activity 中，我有一个 ListView，其中子项包含 EditText、Checkbox 和 TextView。

EditTexts 和 Checkbox 的问题在于滚动时，它们所拥有的内容会丢失。我能够通过将检查状态保存在数组中来解决复选框问题，但我无法解决 EditTexts 的问题。我知道有一些关于这个特定问题的问题，但他们提供的解决方案似乎不起作用。所以这是我的适配器:

public class DiveProfileAdapter extends ArrayAdapter<DiveProfile> {

    private Context mContext;
    private List<DiveProfile> mTasks;
    ViewHolder holder;

    private ArrayList<Boolean> itemChecked = new ArrayList<>(); //for saving checkbox values

    public DiveProfileAdapter(Context context, List<DiveProfile> objects) {
        super(context, R.layout.row_dive_profile_divers_list_item, objects);
        this.mContext = context;
        this.mTasks = objects;

        for (int i = 0; i < this.getCount(); i++) {
            itemChecked.add(i, false); // initializes all items value with false
        }
    }

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

        if (convertView == null) {
            LayoutInflater mLayoutInflater = LayoutInflater.from(mContext);
            convertView = mLayoutInflater.inflate(R.layout.row_dive_profile_divers_list_item, null);

            holder = new ViewHolder();
            holder.diverAttended = (CheckBox) convertView.findViewById(R.id.diver_attended_checkbox);   
            holder.diveTime = (EditText) convertView.findViewById(R.id.dive_time_edit_text);
            holder.depth = (EditText) convertView.findViewById(R.id.depth_edit_text);

            convertView.setTag(holder);
        }else {
            holder = (ViewHolder) convertView.getTag();
        }

        final DiveProfile diverObjectTask = mTasks.get(position);

        holder.diverAttended.setChecked(diverObjectTask.isDiverAttended());
        holder.diveTime.setText(diverObjectTask.getDiveTime());

        holder.diverAttended.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {

                CheckBox cb = (CheckBox) v.findViewById(R.id.diver_attended_checkbox);

                if (cb.isChecked()) {
                    itemChecked.set(position, true);
                    // do some operations here
                } else if (!cb.isChecked()) {
                   itemChecked.set(position, false);
                   // do some operations here
                }
             }
        });
        holder.diverAttended.setChecked(itemChecked.get(position)); // this will Check or Uncheck the

        holder.diveTime.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {

                String txt = setDiveTimeDialog();
                holder.diveTime.setText(txt);
                mTasks.get(position).setCurrentText(txt); //add the setter to the current item's position
            }
        });
        holder.diveTime.setText(diverObjectTask.getCurrentText());

        return convertView;
    }

    static class ViewHolder {
        CheckBox diverAttended;
        EditText diveTime;
        EditText depth;
    }

    private String setDiveTimeDialog() {

        //final String[] items = finItems;
        final String[] items = getContext().getResources().getStringArray(R.array.certification_level_items);

        // Create list dialog with required parameters - context, title, and our array of items to fill the list.
        CustomListDialog.Builder builder = new CustomListDialog.Builder(getContext(), "Dive Time", items);

        // Now again we can use some extra methods on the builder to customise it more.
        builder.titleAlignment(BaseDialog.Alignment.LEFT);
        builder.itemAlignment(BaseDialog.Alignment.LEFT);
        builder.titleColor(getContext().getResources().getColor(R.color.primary_color));


        // Now we can build our dialog.
        CustomListDialog customListDialog = builder.build();

        // Finally we can show it.
        customListDialog.show();

        customListDialog.setListClickListener(new CustomListDialog.ListClickListener() {
            @Override
            public void onListItemSelected(int i, String[] strings, String s) {

                result = s;

            }
        });

        return result;
    }
}

Answer 1

你应该这样做:

final DiveProfile diverObjectTask = mTasks.get(position);
holder.diveTime.setText(diverObjectTask.getDiveTie());
//also set your CheckBox value

这些值变为空，因为您没有在 getView 中设置它(getView 列表滚动时自动调用)

更新

看看你的问题，我认为最简单的方法是在 DiveProfile 中创建新变量类，例如 boolean isSelected和 String currentText .

在那之后，就不需要使用像itemChecked这样的单独列表了。 .你可以get和 set当前项目的值。

使用 getter 的示例:

holder.diverAttended.setChecked(mTasks.get(position).getSelected()); // getSelected is isSelected getter method

然后调用setSelected ( setter 的 isSelected )在你的 holder.diverAttended 中onClick

您的 EditText 示例setter :

    holder.diveTime.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {

            String txt = setDiveTimeDialog();
            holder.diveTime.setText(txt);
            mTasks.get(position).setcurrentText(txt); //add the setter to the current item's position
        }
    });

然后调用getCurrentText()在getView