Android更改单击,自定义可扩展列表适配器上的图像

Question

我将使用自定义可扩展列表适配器实现可扩展的列表视图.
并且还有组扩展和组崩溃的图像更改.

我的可扩展列表视图效果很好但是当我在这些事件上设置图像更改时会出现问题.即当我展开一个时,另一个人的图像也会自动改变.我想我不能保持组项目的正确地址.

这是我的代码.

public class HomeFrame extends Fragment {

    ExpandableListAdapter listAdapter;
    ExpandableListView expListView;
    List<String> listDataHeader;
    ImageView img_selection;
    HashMap<String, List<String>> listDataChild = new HashMap<String, List<String>>();
     public static int[] GalImages = new int[] {
                R.drawable.banner_one,
                R.drawable.banner,
                R.drawable.banner_three,
                R.drawable.banner_two,};
    public HomeFrame() {

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.home_frame, container, false);

        ViewPager viewPager = (ViewPager) rootView.findViewById(R.id.banner);
        ImageAdapter adapter = new ImageAdapter(getActivity());
        viewPager.setAdapter(adapter);

        //img_selection=(ImageView)rootView.findViewById(R.id.img_selection);

        expListView = (ExpandableListView) rootView.findViewById(R.id.lvExp);

        // preparing list data
        prepareListData();

        listAdapter = new ExpListAdapter(getActivity(), listDataHeader,
                listDataChild);

        // setting list adapter
        expListView.setAdapter(listAdapter);

        // Listview Group click listener
        expListView.setOnGroupClickListener(new OnGroupClickListener() {

            @Override
            public boolean onGroupClick(ExpandableListView parent, View v,
                    int groupPosition, long id) {
                Toast.makeText(getActivity(),
                 "Group Clicked " + listDataHeader.get(groupPosition),
                 Toast.LENGTH_SHORT).show();
                return false;

            }
        });

        // Listview Group expanded listener
        expListView.setOnGroupExpandListener(new OnGroupExpandListener() {

            @Override
            public void onGroupExpand(int groupPosition) {

                  Toast.makeText(getActivity(),
                  groupPosition + " Expanded",
                  Toast.LENGTH_SHORT).show();

             img_selection=(ImageView)expListView.getChildAt(groupPosition).findViewById(R.id.img_selection);
                img_selection.setImageResource(R.drawable.arrow_se);
            }
        });

        // Listview Group collasped listener
        expListView.setOnGroupCollapseListener(new OnGroupCollapseListener() {

            @Override
            public void onGroupCollapse(int groupPosition) {

                 Toast.makeText(getActivity(),
                 groupPosition + " Collapsed",
                 Toast.LENGTH_SHORT).show();

                 img_selection=(ImageView) expListView.getChildAt(groupPosition).findViewById(R.id.img_selection);
                //ImageView img_selection=(ImageView) get.findViewById(R.id.img_selection);

                img_selection.setImageResource(R.drawable.arrow);
            }
        });

        // Listview on child click listener
        expListView.setOnChildClickListener(new OnChildClickListener() {

            @Override
            public boolean onChildClick(ExpandableListView parent, View v,
                    int groupPosition, int childPosition, long id) {
                // TODO Auto-generated method stub
                /*
                 * Toast.makeText( getActivity(),
                 * listDataHeader.get(groupPosition) + " : " +
                 * listDataChild.get( listDataHeader.get(groupPosition)).get(
                 * childPosition), Toast.LENGTH_SHORT) .show();
                 */
                return false;
            }
        });

        return rootView;
    }

和Adapter类是..

public class ExpListAdapter extends BaseExpandableListAdapter {

    private Context _context;
    private List<String> _listDataHeader; // header titles
    // child data in format of header title, child title
    private HashMap<String, List<String>> _listDataChild;

    public ExpListAdapter(Context context, List<String> listDataHeader,
            HashMap<String, List<String>> 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);
    }

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

    @Override
    public View getChildView(int groupPosition, final int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {

        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.list_item, null);
        }

        TextView txtListChild = (TextView) convertView
                .findViewById(R.id.lblListItem);

        txtListChild.setText(childText);
        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.item_home, null);
        }

        TextView lblListHeader = (TextView) convertView
                .findViewById(R.id.heading);
        //ImageView img_selection=(ImageView)convertView.findViewById(R.id.img_selection);
        lblListHeader.setTypeface(null, Typeface.BOLD);
        lblListHeader.setText(headerTitle);
        //img_selection.setImageResource(R.drawable.arrow);

        return convertView;
    }

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

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

}

Answer 1

在您的自定义适配器中getGroupView()执行此操作:

@Override
 public View getGroupView(int groupPosition, boolean isExpanded, View view,
                ViewGroup parent) {

    ImageView img_selection=(ImageView) view.findViewById(R.id.img_selection);
    int imageResourceId = isExpanded ? R.drawable.group_closed
                        : R.drawable.group_open;
     img_selection.setImageResource(imageResourceId);
}

Answer 2

在更改组扩展(折叠或扩展)的情况下更改父项图像的最佳方法是使用getGroupView()方法和属性isExpandedbolean 方法.

public View getGroupView(int groupPosition, boolean isExpanded,
        View convertView, ViewGroup parent) {
  ...

    if (isExpanded) {
        groupHolder.img.setImageResource(R.drawable.group_down);
    } else {
        groupHolder.img.setImageResource(R.drawable.group_up);
    }
  ...

}