可扩展的listview android与复选框在onclick选择更多的项目

Question

我为我的英语道歉。我正试图编写一个应用程序，在ExpandableListView中使用复选框，但是，当我单击一个项目列表时，该列表检查了已单击的项目和随后的项目，期间为6。例如，如果我点击第一项被选中，除了第一项，第六项，第十二项等等。下面是我的代码

例子

prepareListData();
    expandableListView = (ExpandableListView)findViewById(R.id.expandableListViewProfessioni);
    expandableListAdapterProfessioni = new ExpandableListAdapterProfessioni(this,listDataHeader,listDataProfessioni);
    expandableListView.setAdapter(expandableListAdapterProfessioni);

    expandableListView.setOnGroupClickListener(new OnGroupClickListener() {
        @Override
        public boolean onGroupClick(ExpandableListView parent, View v,
                                    int groupPosition, long id) {
            setListViewHeight(parent, groupPosition);
            return false;
        }
    });

    expandableListView.setOnChildClickListener(new OnChildClickListener() {
        @Override
        public boolean onChildClick(ExpandableListView parent, View v,
                                    int groupPosition, int childPosition, long id) {
            return false;
        }
    });private void prepareListData() {
    listDataHeader = new ArrayList<String>();
    listDataProfessioni = new HashMap<String, ArrayList<Mestieri>>();
    listDataHeader.add("Professione svolta");
    SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
    Gson gson = new Gson();
    String json = sharedPrefs.getString("HomeActivity", null);
    Type type = new TypeToken<ArrayList<Mestieri>>() {}.getType();
    ArrayList<Mestieri> professioni = gson.fromJson(json, type);
    listDataProfessioni.put(listDataHeader.get(0), professioni);
}
private void setListViewHeight(ExpandableListView listView,
                               int group) {
    ExpandableListAdapter listAdapter = (ExpandableListAdapter) listView.getExpandableListAdapter();
    int totalHeight = 0;
    int desiredWidth = View.MeasureSpec.makeMeasureSpec(listView.getWidth(),
            View.MeasureSpec.EXACTLY);
    for (int i = 0; i < listAdapter.getGroupCount(); i++) {
        View groupItem = listAdapter.getGroupView(i, false, null, listView);
        groupItem.measure(desiredWidth, View.MeasureSpec.UNSPECIFIED);
        totalHeight += groupItem.getMeasuredHeight();
        if (((listView.isGroupExpanded(i)) && (i != group))
                || ((!listView.isGroupExpanded(i)) && (i == group))) {
            for (int j = 0; j < listAdapter.getChildrenCount(i); j++) {
                View listItem = listAdapter.getChildView(i, j, false, null,
                        listView);
                listItem.measure(desiredWidth, View.MeasureSpec.UNSPECIFIED);
                totalHeight = 700;
            }
        }
    }
    ViewGroup.LayoutParams params = listView.getLayoutParams();
    int height = totalHeight
            + (listView.getDividerHeight() * (listAdapter.getGroupCount() - 1));
    if (height < 10)
        height = 200;
    params.height = height;
    listView.setLayoutParams(params);
    listView.requestLayout();
}/**************** ADAPTER *******************/public class ExpandableListAdapterProfessioni extends BaseExpandableListAdapter{
private Context _context;
private List<String> _listDataHeader;
public static ArrayList<String> listaProfessioni;
private HashMap<String, ArrayList<Mestieri>> _listDataChild;
public ExpandableListAdapterProfessioni(Context context, List<String> listDataHeader,
                             HashMap<String, ArrayList<Mestieri>> listChildData) {
    this._context = context;
    this._listDataHeader = listDataHeader;
    this._listDataChild = listChildData;
}
@Override
public Object getChild(int groupPosition, int childPosititon) {
    return this._listDataChild.get(this._listDataHeader.get(groupPosition))
            .get(childPosititon).getNome();
}
@Override
public long getChildId(int groupPosition, int childPosition) {
    return childPosition;
}
@Override
public View getChildView(final int groupPosition, final int childPosition,
                         boolean isLastChild, View convertView, ViewGroup parent) {
    final String childText = (String) getChild(groupPosition, childPosition);
    listaProfessioni = new ArrayList<String>();
    if (convertView == null) {
        LayoutInflater infalInflater = (LayoutInflater) this._context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = infalInflater.inflate(R.layout.expandable_listview_item_professioni, null);
    }
    TextView txtListChild = (TextView) convertView
            .findViewById(R.id.expandableListViewProfessioniItem);
    txtListChild.setText(childText);
    final CheckBox checkBox = (CheckBox) convertView.findViewById(R.id.checkBoxItem);
    convertView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if(checkBox.isChecked()){
                checkBox.setChecked(false);
            }else {
                checkBox.setChecked(true);
                //listaProfessioni.add(getChild(groupPosition,childPosition).toString());
            }
        }
    });
    return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
    return this._listDataChild.get(this._listDataHeader.get(groupPosition))
            .size();
}
@Override
public Object getGroup(int groupPosition) {
    return this._listDataHeader.get(groupPosition);
}
@Override
public int getGroupCount() {
    return this._listDataHeader.size();
}
@Override
public long getGroupId(int groupPosition) {
    return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
                         View convertView, ViewGroup parent) {
    String headerTitle = (String) getGroup(groupPosition);
    if (convertView == null) {
        LayoutInflater infalInflater = (LayoutInflater) this._context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = infalInflater.inflate(R.layout.expandable_listview_professioni, null);
    }
    TextView lblListHeader = (TextView) convertView
            .findViewById(R.id.expandableListViewProfessioniHeader);
    lblListHeader.setTypeface(null, Typeface.NORMAL);
    lblListHeader.setText(headerTitle);
    return convertView;
}
@Override
public boolean hasStableIds() {
    return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
    return true;
}}

Answer 1

首先，您应该添加一个数据结构来保存所有复选框的状态:

private SparseArray<SparseArray<Boolean>> checked;

在适配器上设置一些额外的方法:

public boolean isChildChecked(int groupPosition, int childPosition) {
    SparseArray children = checked.get(groupPosition);
    if (children == null) return false;
    return children.get(childPosition, false);
}
public void setChildChecked(int groupPosition, int childPosition, boolean checked) {
    SparseArray children = checked.get(groupPosition);
    if (children == null) {
        children = new SparseArray<Boolean>();
        checked.put(groupPosition, children);
    }
    children.put(childPosition, checked);
}
public void toggleChild(int groupPosition, int childPosition) {
    setChildChecked(groupPosition, childPosition, 
            ! getChildChecked(groupPosition, childPosition));
}

现在您可以在getView中获得选中值，当您设置复选框时，并从事件处理程序设置选中值:

final CheckBox checkBox = (CheckBox) convertView.findViewById(R.id.checkBoxItem);
checkBox.setChecked(getChildChecked(groupPosition, childPosition));
convertView.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        ExpandableListAdapterProfessioni.this.toggleChild(groupPosition, childPosition);
         //listaProfessioni.add(getChild(groupPosition,childPosition).toString());
        notifyDataSetChanged();
    }
});

这是处理选中状态的一种方法。而不是一个单独的嵌套SparseArray，它会更有意义，如果你添加一个"checked"属性到你的Mestieri类，并使用它来代替。

注意:为了在设备旋转时保留所有这些复选框，您需要在onSaveInstanceState()中以某种方式保存选中的值。

Answer 2

我已经解决了这个代码片段:

@Override
public View getChildView(final int groupPosition, final int childPosition,
                             boolean isLastChild, View convertView, ViewGroup parent) {final int mGroupPosition = groupPosition;
        final int mChildPosition = childPosition;
        final String childText = (String) getChild(groupPosition, childPosition);
        if (convertView == null) {
            LayoutInflater infalInflater = (LayoutInflater) this._context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.expandable_listview_item_professioni, null);
        }
        TextView txtListChild = (TextView) convertView
                .findViewById(R.id.expandableListViewProfessioniItem);
        txtListChild.setText(childText);
        final CheckBox checkBox = (CheckBox) convertView.findViewById(R.id.checkBoxItem);
        checkBox.setOnCheckedChangeListener(null);
        if (mChildCheckStates.containsKey(mGroupPosition)) {
            boolean getChecked[] = mChildCheckStates.get(mGroupPosition);
            checkBox.setChecked(getChecked[mChildPosition]);
        } else {
            boolean getChecked[] = new boolean[getChildrenCount(mGroupPosition)];
            mChildCheckStates.put(mGroupPosition, getChecked);
            checkBox.setChecked(false);
        }
        checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if (isChecked) {
                    boolean getChecked[] = mChildCheckStates.get(mGroupPosition);
                    getChecked[mChildPosition] = isChecked;
                    mChildCheckStates.put(mGroupPosition, getChecked);
                } else {
                    boolean getChecked[] = mChildCheckStates.get(mGroupPosition);
                    getChecked[mChildPosition] = isChecked;
                    mChildCheckStates.put(mGroupPosition, getChecked);
                }
            }
        });
        convertView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(checkBox.isChecked()){
                    checkBox.setChecked(false);
                }else {
                    checkBox.setChecked(true);
                }
            }
        });
        return convertView;
    }