我正在尝试在 Fragements 中实现可扩展 ListView 。我已经测试了所有设置为 toast 的值并且它工作正常。但是我的可扩展 ListView 不是 Dispaly。我没有得到任何错误。请在下面找到我使用的代码。
package com.test.expandablelistView;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.example.tesfragement.R;
import com.example.tesfragement.R.layout;
import android.os.Bundle;
import android.app.Fragment;
import android.database.DataSetObserver;
import android.support.v4.app.FragmentActivity;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.SimpleExpandableListAdapter;
import android.widget.Toast;
/**
* A simple {@link android.support.v4.app.Fragment} subclass.
*
*/
public class ExpandableListFragment extends Fragment {
View v;
ExpandableListAdapter mAdapter;
List<String> _listDataHeader;
HashMap<String, List<String>> _listDataChild;
private Parent parent;
private Child child;
ExpandableListView lv;
public ExpandableListFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
v= inflater.inflate(R.layout.expandable_fragements,
container, false);
return v;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
parent=new Parent();
child=new Child();
ExpandableListView lv = (ExpandableListView) v.findViewById(R.id.expandableListView1);
//here setting all the values to Parent and child classes
setDataValues();
prepareListData();//here get the values and set this values to adoptor and set it visible
mAdapter=new ExpandableListAdapter() {
@Override
public void unregisterDataSetObserver(DataSetObserver observer) {
// TODO Auto-generated method stub
Toast.makeText(getActivity(),"hello", Toast.LENGTH_LONG).show();
}
@Override
public void registerDataSetObserver(DataSetObserver observer) {
// TODO Auto-generated method stub
Toast.makeText(getActivity(),"hello1", Toast.LENGTH_LONG).show();
}
@Override
public void onGroupExpanded(int groupPosition) {
// TODO Auto-generated method stub
Toast.makeText(getActivity(),"hello2", Toast.LENGTH_LONG).show();
}
@Override
public void onGroupCollapsed(int groupPosition) {
// TODO Auto-generated method stub
Toast.makeText(getActivity(),"hello3", Toast.LENGTH_LONG).show();
}
@Override
public boolean isEmpty() {
// TODO Auto-generated method stub
Toast.makeText(getActivity(),"hello4", Toast.LENGTH_LONG).show();
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
Toast.makeText(getActivity(),"hello5", Toast.LENGTH_LONG).show();
return false;
}
@Override
public boolean hasStableIds() {
// TODO Auto-generated method stub
Toast.makeText(getActivity(),"hello6", Toast.LENGTH_LONG).show();
return false;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
Toast.makeText(getActivity(),"hello7", Toast.LENGTH_LONG).show();
// TODO Auto-generated method stub
return v;
}
@Override
public long getGroupId(int groupPosition) {
// TODO Auto-generated method stub
Toast.makeText(getActivity(),"hello8", Toast.LENGTH_LONG).show();
return 0;
}
@Override
public int getGroupCount() {
// TODO Auto-generated method stub
Toast.makeText(getActivity(),"hello9", Toast.LENGTH_LONG).show();
return 0;
}
@Override
public Object getGroup(int groupPosition) {
// TODO Auto-generated method stub
Toast.makeText(getActivity(),"hello10", Toast.LENGTH_LONG).show();
return null;
}
@Override
public long getCombinedGroupId(long groupId) {
// TODO Auto-generated method stub
Toast.makeText(getActivity(),"hello11", Toast.LENGTH_LONG).show();
return 0;
}
@Override
public long getCombinedChildId(long groupId, long childId) {
// TODO Auto-generated method stub
Toast.makeText(getActivity(),"hello12", Toast.LENGTH_LONG).show();
return 0;
}
@Override
public int getChildrenCount(int groupPosition) {
// TODO Auto-generated method stub
Toast.makeText(getActivity(),"hello13", Toast.LENGTH_LONG).show();
return 0;
}
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
Toast.makeText(getActivity(),"hello14", Toast.LENGTH_LONG).show();
return v;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
Toast.makeText(getActivity(),"hello15", Toast.LENGTH_LONG).show();
return 0;
}
@Override
public Object getChild(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
Toast.makeText(getActivity(),"hello16", Toast.LENGTH_LONG).show();
return null;
}
@Override
public boolean areAllItemsEnabled() {
// TODO Auto-generated method stub
Toast.makeText(getActivity(),"hello17", Toast.LENGTH_LONG).show();
return false;
}
};
// mAdapter = new ExpandableListAdapter(this, _listDataHeader, _listDataChild);
// setting list adapter
lv.setAdapter(mAdapter);
}
public void prepareListData()
{
// testing purpose
_listDataHeader = new ArrayList<String>();
_listDataChild = new HashMap<String, List<String>>();
// declare the references
//add the parent values to List
_listDataHeader.add(parent.getCardName());
_listDataHeader.add(String.valueOf(parent.getMinimum_salary()));
_listDataHeader.add(String.valueOf(parent.getInterest_rate()));
//set Child views to parent
List<String> cardDetails=new ArrayList<String>();
cardDetails.add("");
List<String> mininum_sal_details=new ArrayList<String>();
mininum_sal_details.add(child.GetMinimumSalDetails());
List<String> interest_details=new ArrayList<String>();
interest_details.add(child.get_interest_rate_details());
//set to adoptor
_listDataChild.put(_listDataHeader.get(0), cardDetails);
_listDataChild.put(_listDataHeader.get(1),mininum_sal_details);
//
for(int i = 0; i < _listDataHeader.size(); i++) //cars name of arraylist
{
String value=_listDataHeader.get(i);
Toast toast = Toast.makeText(getActivity(),value, Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
}
public void setDataValues()
{
//set Parent values
parent.setCardName("Platinum credit Card");
parent.setMinimum_salary(15000.00);
parent.setInterest_Rate(1.2);
//set Child values
child.set_card_details("You require minimum salary of 1500 per month");
child.set_interest_rate_details("interest rate is 2.0%");
}
}
最佳答案
因为您没有返回实际的 child 或组数,所以您也不应该在 getGroup 或 getChild 方法上返回 null。试着按照这个example
关于android - Expandablelistview in fragment- Expandable List Not display,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/22067471/