Android单击更改图像，自定义可扩展列表适配器 [英] Android Change image on click, custom expandable list adapter
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问题描述
我将使用自定义可扩展列表适配器实现可扩展列表视图.
并且在组展开和组折叠时图像也会改变.
I am going to implement an expandable listview with custom expandable list adapter.
And also image change on group expand and group collapse.
我的可扩展列表"视图运行良好，但是当我在这些事件上设置图像更改时，出现了一些问题.也就是说，当我展开一个图像时，另一个图像也会自动更改.我想我不能保存该分组项目的正确地址.
My Expandable list view works well but when I set image change on those events there is some problem. i.e when I expand one, automatically another one's image also changes. I think I can not hold the proper address of the group item.
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;
}
而Adapter类是..
And Adapter class is..
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;
}
}
推荐答案
在getGroupView()中的自定义适配器中，执行以下操作:
In your custom adapter in the getGroupView() do this:
@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);
}
这篇关于Android单击更改图像，自定义可扩展列表适配器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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