我创建了ExpandableListView并使用静态数据，我的问题是我不知道如何将sqlite database中的数据导入ExpandableListView。我尝试了多个网站和帖子，但收效甚微。
如果有人可以请看下面我的代码，并提出一个有效的解决方案。
由于
package com.example.pooveshin.vennsroadaccident2;
import android.app.Activity;
import android.database.Cursor;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ExpandableListView.OnGroupClickListener;
import android.widget.ExpandableListView.OnGroupCollapseListener;
import android.widget.ExpandableListView.OnGroupExpandListener;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
public class MainActivity extends Activity {
ExpandableListAdapter listAdapter;
ExpandableListView expListView;
List<String> listDataHeader;
HashMap<String, List<String>> listDataChild;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 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);
// Listview Group click listener
expListView.setOnGroupClickListener(new OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v,
int groupPosition, long id) {
// Toast.makeText(getApplicationContext(),
// "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(getApplicationContext(),
listDataHeader.get(groupPosition) + " Expanded",
Toast.LENGTH_SHORT).show();
}
});
// Listview Group collasped listener
expListView.setOnGroupCollapseListener(new OnGroupCollapseListener() {
@Override
public void onGroupCollapse(int groupPosition) {
Toast.makeText(getApplicationContext(),
listDataHeader.get(groupPosition) + " Collapsed",
Toast.LENGTH_SHORT).show();
}
});
// 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(
getApplicationContext(),
listDataHeader.get(groupPosition)
+ " : "
+ listDataChild.get(
listDataHeader.get(groupPosition)).get(
childPosition), Toast.LENGTH_SHORT)
.show();
return false;
}
});
}
/*
* Preparing the list data
*/
private void prepareListData() {
listDataHeader = new ArrayList<String>();
listDataChild = new HashMap<String, List<String>>();
// Adding child data
listDataHeader.add("Accident Number : 1");
listDataHeader.add("Accident Number : 2");
listDataHeader.add("Accident Number : 3");
// Adding child data
List<String> AccYV = new ArrayList<String>();
AccYV.add("Accident Number : ");
AccYV.add("Registration Number : ");
AccYV.add("Make & Model");
AccYV.add("Address of Owner");
AccYV.add("Name of Driver");
AccYV.add("Address of Driver");
AccYV.add("Tel no.Driver");
List<String> AccOV = new ArrayList<String>();
AccOV.add("Name of Driver");
AccOV.add("Identity Number");
AccOV.add("Residential Address");
AccOV.add("Tel no.Work");
AccOV.add("Make & Model");
AccOV.add("Licence Number");
List<String> AccCD = new ArrayList<String>();
AccCD.add("Date");
AccCD.add("Time");
AccCD.add("Place");
AccCD.add("Weather");
AccCD.add("Road Surface");
listDataChild.put(listDataHeader.get(0), AccYV); // Header, Child data
listDataChild.put(listDataHeader.get(1), AccOV);
listDataChild.put(listDataHeader.get(2), AccCD);
}
}
在DBHelper.java中
public Cursor getYVAllData()
{
SQLiteDatabase sqLiteDatabase = this.getWritableDatabase();
Cursor res = sqLiteDatabase.rawQuery("SELECT * FROM " + TABLE_NAME,null);
return res;
}
答案 0 :(得分：1)
你应该为这个
制作一个适用于expandablelistview的适配器 public class ExpandListAdapter extends BaseExpandableListAdapter {
private Context context;
private ArrayList<ExpandListGroup> groups;
public ExpandListAdapter(Context context, ArrayList<ExpandListGroup> groups) {
this.context = context;
this.groups = groups;
}
public void addItem(ExpandListChild item, ExpandListGroup group) {
if (!groups.contains(group)) {
groups.add(group);
}
int index = groups.indexOf(group);
ArrayList<ExpandListChild> ch = groups.get(index).getItems();
ch.add(item);
groups.get(index).setItems(ch);
}
public Object getChild(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
ArrayList<ExpandListChild> chList = groups.get(groupPosition).getItems();
return chList.get(childPosition);
}
public long getChildId(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return childPosition;
}
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View view,
ViewGroup parent) {
ExpandListChild child = (ExpandListChild) getChild(groupPosition, childPosition);
if (view == null) {
LayoutInflater infalInflater = (LayoutInflater) context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
view = infalInflater.inflate(R.layout.expandlist_child_item, null);
}
TextView tv = (TextView) view.findViewById(R.id.tvChild);
tv.setText(child.getName().toString());
tv.setTag(child.getTag());
// TODO Auto-generated method stub
return view;
}
public int getChildrenCount(int groupPosition) {
// TODO Auto-generated method stub
ArrayList<ExpandListChild> chList = groups.get(groupPosition).getItems();
return chList.size();
}
public Object getGroup(int groupPosition) {
// TODO Auto-generated method stub
return groups.get(groupPosition);
}
public int getGroupCount() {
// TODO Auto-generated method stub
return groups.size();
}
public long getGroupId(int groupPosition) {
// TODO Auto-generated method stub
return groupPosition;
}
public View getGroupView(int groupPosition, boolean isLastChild, View view,
ViewGroup parent) {
ExpandListGroup group = (ExpandListGroup) getGroup(groupPosition);
if (view == null) {
LayoutInflater inf = (LayoutInflater) context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
view = inf.inflate(R.layout.expandlist_group_item, null);
}
TextView tv = (TextView) view.findViewById(R.id.tvGroup);
tv.setText(group.getName());
// TODO Auto-generated method stub
return view;
}
public boolean hasStableIds() {
// TODO Auto-generated method stub
return true;
}
public boolean isChildSelectable(int arg0, int arg1) {
// TODO Auto-generated method stub
return true;
}
}
然后你应该为这个列表创建子类和组类
子：
public class ExpandListChild {
private String Name;
private String Tag;
public String getName() {
return Name;
}
public void setName(String Name) {
this.Name = Name;
}
public String getTag() {
return Tag;
}
public void setTag(String Tag) {
this.Tag = Tag;
}
}
组：
public class ExpandListGroup {
private String Name;
private ArrayList<ExpandListChild> Items;
public String getName() {
return Name;
}
public void setName(String name) {
this.Name = name;
}
public ArrayList<ExpandListChild> getItems() {
return Items;
}
public void setItems(ArrayList<ExpandListChild> Items) {
this.Items = Items;
}
}
这是您在MainActivity中的用法：
ExpandList = (ExpandableListView) findViewById(R.id.expandableListView);
ExpListItems = SetStandardGroups(da.queryName());
ExpAdapter = new ExpandListAdapter(MainActivity.this, ExpListItems);
and this is my method for fiil that list:
public ArrayList<ExpandListGroup> SetStandardGroups(Cursor crsr) {
ArrayList<ExpandListGroup> list = new ArrayList<ExpandListGroup>();
ArrayList<ExpandListChild> list2;
Cursor c = crsr;
if (c.moveToFirst()) {
do {
String English = c.getString(c.getColumnIndex("English"));
String Farsi = c.getString(c.getColumnIndex("Farsi"));
ExpandListGroup gru1 = new ExpandListGroup();
gru1.setName(English);
ExpandListChild ch1_1 = new ExpandListChild();
ch1_1.setName(Farsi);
ch1_1.setTag(null);
list2 = new ArrayList<ExpandListChild>();
list2.add(ch1_1);
gru1.setItems(list2);
list.add(gru1);
} while (c.moveToNext());
}
c.close();
return list;
}