我有可扩展的ListView。如果我单击组视图，我想找到子大小，如果子大小为零，那么它将转到另一个活动，否则它将显示所有子视图。
这里我的代码有一个问题。例如，如果我的孩子大小为零，那么如果我点击组视图，它将进入另一个活动。然后我再次反击，然后我点击另一个组视图，它显示以前我的子视图的大小是最后一个组视图显示的（大小为零）。任何人都可以帮我解决问题吗？
public class ExpandableListActivity extends Activity {
ExpandableListAdapter listAdapter;
ExpandableListView expListView;
List<String> listDataHeader;
HashMap<String, List<String>> listDataChild;
int group_position,child_position;
boolean flag=false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.expandable_list);
// get the listview
expListView = (ExpandableListView) findViewById(R.id.lvExp);
// preparing list data
prepareListData();
listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);
// setting list adapter
expListView.setAdapter(listAdapter);
expListView.setOnGroupClickListener(new OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
if(child_position == 0){
// TODO Auto-generated method stub
Intent intent=new Intent(ExpandableListActivity.this,MainActivity.class);
startActivity(intent);
}
return false;
}
});
}
/*
* Preparing the list data
*/
private void prepareListData() {
listDataHeader = new ArrayList<String>();
listDataChild = new HashMap<String, List<String>>();
// Adding child data
listDataHeader.add("Top 250");
listDataHeader.add("Now Showing");
listDataHeader.add("Coming Soon..");
// Adding child data
List<String> top250 = new ArrayList<String>();
top250.add("The Shawshank Redemption");
top250.add("The Godfather");
top250.add("The Godfather: Part II");
top250.add("Pulp Fiction");
top250.add("The Good, the Bad and the Ugly");
top250.add("The Dark Knight");
top250.add("12 Angry Men");
List<String> nowShowing = new ArrayList<String>();
nowShowing.add("The Conjuring");
nowShowing.add("Despicable Me 2");
nowShowing.add("Turbo");
nowShowing.add("Grown Ups 2");
nowShowing.add("Red 2");
nowShowing.add("The Wolverine");
List<String> comingSoon = new ArrayList<String>();
// comingSoon.add("2 Guns");
// comingSoon.add("The Smurfs 2");
// comingSoon.add("The Spectacular Now");
// comingSoon.add("The Canyons");
// comingSoon.add("Europa Report");
listDataChild.put(listDataHeader.get(0), top250); // Header, Child data
listDataChild.put(listDataHeader.get(1), nowShowing);
listDataChild.put(listDataHeader.get(2), comingSoon);
}
public class ExpandableListAdapter 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 ExpandableListAdapter(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.expand_list_item, null);
}
TextView txtListChild = (TextView) convertView
.findViewById(R.id.lblListItem);
txtListChild.setText(childText);
convertView.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent=new Intent(ExpandableListActivity.this,MainActivity.class);
startActivity(intent);
}
});
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
child_position=this._listDataChild.get(this._listDataHeader.get(groupPosition))
.size();
group_position=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(final 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.list_group, null);
}
TextView lblListHeader = (TextView) convertView
.findViewById(R.id.lblListHeader);
lblListHeader.setTypeface(null, Typeface.BOLD);
lblListHeader.setText(headerTitle);
return convertView;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
答案 0 :(得分：0)
将onGroupClick更改为：
@Override
public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
if(listAdapter.getChildrenCount(groupPosition) == 0){
// TODO Auto-generated method stub
Intent intent=new Intent(ExpandableListActivity.this,MainActivity.class);
startActivity(intent);
}
return false;
}
我还注意到group_position没有在任何地方使用，感染你甚至没有为它分配任何值。如果您使用group_position更改了以下内容：
@Override
public int getChildrenCount(int groupPosition) {
child_position=this._listDataChild.get(this._listDataHeader.get(groupPosition))
.size();
// group_position=groupPosition; <<<change to below>>>
ExpandableListActivity.this.groupPosition=groupPosition;
return this._listDataChild.get(this._listDataHeader.get(groupPosition))
.size();
}