在每个子项中添加带有EditTexts的ListView - Android Studio

Question

我正在创建一个应用程序，允许用户将数据输入每个子单元格。此外，当用户单击最底部的单元格时，它会向父级添加一个额外的子级。但是，当我添加一个新的孩子时，旧的子细胞中的所有输入数据都会消失。

还有一种保存输入每个单元格的所有数据的最佳方法吗？

控制视图的类：

public class CustomWorkout extends AppCompatActivity {

ExpandableListView expandableListView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_custom_workout);

    expandableListView = (ExpandableListView) findViewById(R.id.expWorkout);
    final List<String> headings = new ArrayList<String>();
    final HashMap<String, List<String>> child = new HashMap<String, List<String>>();

    Spinner spinnerSplit = (Spinner) findViewById(R.id.spinnerSplit);

    ArrayAdapter<String> myAdapter = new ArrayAdapter<String>(CustomWorkout.this, R.layout.spinner_item, getResources().getStringArray(R.array.split));
    myAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinnerSplit.setAdapter(myAdapter);

   final ListViewAdapter listViewAdapter = new ListViewAdapter(this, headings, child);
    expandableListView.setAdapter(listViewAdapter);

    spinnerSplit.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            headings.clear();

                for (int i = 0; i < position + 1; i++) {
                    String add = "Day " + Integer.toString(i + 1);
                   List<String> put = new ArrayList<String>();
                   put.add("Add a Workout");
                    headings.add(add);
                    child.put(add, put);
                }
            listViewAdapter.notifyDataSetChanged();
            expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
                @Override
                public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
                    if (childPosition == listViewAdapter.getChildrenCount(groupPosition) - 1) {
                        String header = "Day " + (groupPosition + 1);
                        child.get(header).add("Add a Workout");
                        listViewAdapter.notifyDataSetChanged();
                        return true;
                    }
                    return false;
                }
            });
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {

        }
    });


}

}

适配器类：

public class ListViewAdapter extends BaseExpandableListAdapter {

private List<String> headerTitle;
private HashMap<String, List<String>> childItems;
private Context context;

ListViewAdapter(Context context, List<String> headerTitle, HashMap<String, List<String>> childItems) {
    this.context = context;
    this.headerTitle = headerTitle;
    this.childItems = childItems;
}


@Override
public int getGroupCount() {
    return headerTitle.size();
}

@Override
public int getChildrenCount(int groupPosition) {
    return childItems.get(headerTitle.get(groupPosition)).size();
}

@Override
public Object getGroup(int groupPosition) {
    return headerTitle.get(groupPosition);
}

@Override
public Object getChild(int groupPosition, int childPosition) {
    return childItems.get(headerTitle.get(groupPosition)).get(childPosition);
}

@Override
public long getGroupId(int groupPosition) {
    return groupPosition;
}

@Override
public long getChildId(int groupPosition, int childPosition) {
    return childPosition;
}

@Override
public boolean hasStableIds() {
    return false;
}

@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
    String title = (String) this.getGroup(groupPosition);

    if (convertView == null) {
        LayoutInflater layoutInflater = (LayoutInflater) this.context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
        convertView = layoutInflater.inflate(R.layout.list_view_header, null);
    }

    TextView textView = (TextView) convertView.findViewById(R.id.headerParent);
    textView.setTypeface(null, Typeface.BOLD);
    textView.setText(title);

    return convertView;
}

@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
    int count = getChildrenCount(groupPosition);

    String title = (String) this.getChild(groupPosition, childPosition);
    LayoutInflater layoutInflater = (LayoutInflater) this.context.getSystemService(context.LAYOUT_INFLATER_SERVICE);


    if (convertView == null) {
        if (!isLastChild) {
            convertView = layoutInflater.inflate(R.layout.add_workout, null);
        } else if (isLastChild) {
            convertView = layoutInflater.inflate(R.layout.list_view_child, null);
            TextView textView = (TextView) convertView.findViewById(R.id.headerChild);
            textView.setText(title);
        }
    } else {
        if (isLastChild) {
            convertView = layoutInflater.inflate(R.layout.list_view_child, null);
            TextView textView = (TextView) convertView.findViewById(R.id.headerChild);
            textView.setText(title);
        } else {
            convertView = layoutInflater.inflate(R.layout.add_workout, null);

        }
    }

    return convertView;
}

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
    return true;
}