如何在android中从json动态创建可扩展listview中的组和子组?
我在安卓上做一个客户机-服务器项目。我需要从给定的URL解析JSON,并将其放在如何在android中从json动态创建可扩展listview中的组和子组?,android,json,expandablelistview,Android,Json,Expandablelistview,我在安卓上做一个客户机-服务器项目。我需要从给定的URL解析JSON,并将其放在ExpandableListView中。在JSON响应中,我获取包含数组的节点的数据。因此,我必须将mainJsonArray放到ExpandableListView中的组中。它很好用 我可以找出有多少组来自JSON,但当我试图根据来自服务器的数据将子对象放入每个组时,问题就出现了。我的代码只将第一个子项放在第一个组中,但当我单击第二个子项时,它显示错误 我需要将“ID”和“用户名”放在相应的组中(例如:电子邮件、传
ExpandableListView
中。在JSON响应中,我获取包含数组的节点的数据。因此,我必须将mainJsonArray
放到ExpandableListView
中的组中。它很好用
我可以找出有多少组来自JSON,但当我试图根据来自服务器的数据将子对象放入每个组时,问题就出现了。我的代码只将第一个子项放在第一个组中,但当我单击第二个子项时,它显示错误
我需要将“ID”和“用户名”放在相应的组中(例如:电子邮件、传真、上传)。我的代码可以在一个组中放置一个子信息,但当我单击第二个组时,它崩溃了。我们将非常感谢您的任何帮助
那么,我的问题是,如何根据服务器数据动态创建组并将子数据放置在每个子数据中?
以下是日志中的错误:
JSON响应
04-07 17:49:02.194: E/AndroidRuntime(13285): FATAL EXCEPTION: main
04-07 17:49:02.194: E/AndroidRuntime(13285): java.lang.IndexOutOfBoundsException: Invalid index 1, size is 1
04-07 17:49:02.194: E/AndroidRuntime(13285): at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251)
04-07 17:49:02.194: E/AndroidRuntime(13285): at java.util.ArrayList.get(ArrayList.java:304)
04-07 17:49:02.194: E/AndroidRuntime(13285): at android.widget.SimpleExpandableListAdapter.getChildrenCount(SimpleExpandableListAdapter.java:255)
04-07 17:49:02.194: E/AndroidRuntime(13285): at android.widget.ExpandableListConnector.refreshExpGroupMetadataList(ExpandableListConnector.java:561)
04-07 17:49:02.194: E/AndroidRuntime(13285): at android.widget.ExpandableListConnector.expandGroup(ExpandableListConnector.java:682)
04-07 17:49:02.194: E/AndroidRuntime(13285): at android.widget.ExpandableListView.handleItemClick(ExpandableListView.java:561)
04-07 17:49:02.194: E/AndroidRuntime(13285): at android.widget.ExpandableListView.performItemClick(ExpandableListView.java:521)
04-07 17:49:02.194: E/AndroidRuntime(13285): at android.widget.AbsListView$PerformClick.run(AbsListView.java:2514)
04-07 17:49:02.194: E/AndroidRuntime(13285): at android.widget.AbsListView$1.run(AbsListView.java:3168)
04-07 17:49:02.194: E/AndroidRuntime(13285): at android.os.Handler.handleCallback(Handler.java:605)
04-07 17:49:02.194: E/AndroidRuntime(13285): at android.os.Handler.dispatchMessage(Handler.java:92)
04-07 17:49:02.194: E/AndroidRuntime(13285): at android.os.Looper.loop(Looper.java:137)
04-07 17:49:02.194: E/AndroidRuntime(13285): at android.app.ActivityThread.main(ActivityThread.java:4424)
04-07 17:49:02.194: E/AndroidRuntime(13285): at java.lang.reflect.Method.invokeNative(Native Method)
04-07 17:49:02.194: E/AndroidRuntime(13285): at java.lang.reflect.Method.invoke(Method.java:511)
{ "email":[
{"ID":"123","username":"dipakadmin"},
{"ID":"3233","username":"raju"},
{"ID":"5445","username":"hussain"}
]
,
"fax":[
{"ID":"6665","username":"mohammad"},
{"ID":"9877","username":"raj"},
{"ID":"87655","username":"aryan"}
]
,
"upload":
[
{"ID":"132322","username":"raja"},
{"ID":"544333","username":"bala"},
]
}
package com.ExpandableListActivity;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.ExpandableListActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.SimpleExpandableListAdapter;
import android.widget.TextView;
public class DocumentCenter extends ExpandableListActivity {
public static JSONObject jsonDocu=null;
JSONArray jArray = null;
JSONObject json_data = null;
JSONObject root = null;
List<List<Map<String, String>>> childs;
List<Map<String, String>> child1;
List<Map<String, String>> child2;
List<Map<String, String>> child3;
SimpleExpandableListAdapter adapter;
Map<String, String> childdata1;
public static String url3=null;
String strEmailNull=null;
String strFaxNull=null;
String strUploadNull=null;
public String user=null;
TextView txtMLSID;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main2);
user= TabBarExample.getJsonUser;
Log.e("log_tag","USERNAME On Document : "+user);
List<Map<String, String>> groups = new ArrayList<Map<String, String>>();
child1 = new ArrayList<Map<String, String>>();
child2 = new ArrayList<Map<String, String>>();
child3 = new ArrayList<Map<String, String>>();
url3 ="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
Log.e("log_tag","URL on DOCUMENT : "+url3);
try {
jsonDocu = JSONfunctions1.getJSONfromURL(url3);
JSONArray ary = jsonDocu.names();
Log.e("log_tag","ary : "+ary .toString());
for (int i1 = 0; i1 < ary.length(); i1++) {
String value = ary.get(i1).toString();
Log.e("log_tag","value : "+value);
strEmailNull= jsonDocu.getString(value);
if (!strEmailNull.equals("null")){
try{
Map<String, String> group1 = new HashMap<String, String>();
group1.put("group", value);
//group1.put("group", value+(i1+1));
groups.add(group1);
JSONArray email = jsonDocu.getJSONArray(value);
for(int i=0;i<email.length() ;i++){
childdata1 = new HashMap<String, String>();
JSONObject e = email.getJSONObject(i+1);
childdata1.put("child", e.getString("ID"));
childdata1.put("child1", "Name: "+e.getString("name"));
childdata1.put("child2", "Size: "+e.getString("size"));
childdata1.put("child3", "Update: "+e.getString("lastUpdate"));
child1.add(childdata1);
childs = new ArrayList<List<Map<String, String>>>();
}
}catch(JSONException e){
Log.e("log_tag", "Error parsing data "+e.toString());
}
}
}
childs.add(child1);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
adapter = new SimpleExpandableListAdapter(
this, groups, R.layout.groups2, new String[] { "group" },
new int[] { R.id.group }, childs, R.layout.childs2,
new String[] { "child1","child2" ,"child3"}, new int[] { R.id.child1, R.id.child2, R.id.child3});
setListAdapter(adapter);
}
@Override
public boolean setSelectedChild(int groupPosition, int childPosition,
boolean shouldExpandGroup) {
//do something
Log.e("log_tag","setSelectedChild: ");
return super.setSelectedChild(groupPosition, childPosition,
shouldExpandGroup);
}
@Override
public void setSelectedGroup(int groupPosition) {
//do something
Log.e("log_tag","setSelectedGroup: ");
super.setSelectedGroup(groupPosition);
}
}
这只是JSON响应的一个示例。真正的响应有很多标签
ExpandableListActivity的代码示例如下:
package com.ExpandableListActivity;
导入java.util.ArrayList;
导入java.util.HashMap;
导入java.util.List;
导入java.util.Map;
导入org.json.JSONArray;
导入org.json.JSONException;
导入org.json.JSONObject;
导入android.app.ExpandableListActivity;
导入android.os.Bundle;
导入android.util.Log;
导入android.widget.SimpleExpandableListAdapter;
导入android.widget.TextView;
公共类DocumentCenter扩展了ExpandableListActivity{
公共静态JSONObject jsonDocu=null;
JSONArray-jArray=null;
JSONObject json_data=null;
JSONObject root=null;
列出儿童;
名单1;
名单2;
清单3;
SimpleExpandableListAdapter适配器;
地图儿童数据1;
公共静态字符串url3=null;
字符串strEmailNull=null;
字符串strFaxNull=null;
字符串strUploadNull=null;
公共字符串user=null;
TextView-txtMLSID;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main2);
user=TabBarExample.getJsonUser;
Log.e(“日志标签”,“文档上的用户名:“+用户”);
列表组=新的ArrayList();
child1=新的ArrayList();
child2=新的ArrayList();
child3=新的ArrayList();
url3=“XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX”;
Log.e(“日志标签”,“文件上的URL:+url3”);
试一试{
jsonDocu=JSONfunctions1.getJSONfromURL(url3);
JSONArray ari=jsonDocu.names();
Log.e(“Log_标记”,“ary:+ary.toString());
for(int i1=0;i1 对于(int i=0;i我将这样做。当然,您可以像解析一样使用解析。但是,我将使用jackson库并基于响应创建一个对象类,使用ObjectMapper,这将看起来更优雅,并节省解析时间。您可以根据需要在此处添加更多字段,如内部传真和电子邮件类以及list:
public class ResponseObject {
private List<Email> email;
/**
* @return the email
*/
public List<Email> getEmail() {
return email;
}
/**
* @param email
* the email to set
*/
public void setEmail(List<Email> email) {
this.email = email;
}
public static class Email {
private Integer ID;
private String username;
/**
* @return the ID
*/
public Integer getID() {
return ID;
}
/**
* @param ID
* the ID to set
*/
public void setID(Integer ID) {
ID = ID;
}
/**
* @return the username
*/
public String getUsername() {
return username;
}
/**
* @param username
* the username to set
*/
public void setUsername(String username) {
this.username = username;
}
}
}
公共类响应对象{
私人名单电子邮件;
/**
*@返回电子邮件
*/
公共列表getEmail(){
回复邮件;
}
/**
*@param电子邮件
*要设置的电子邮件
*/
公用电子邮件(列出电子邮件){
this.email=电子邮件;
}
公共静态类电子邮件{
私有整数ID;
私有字符串用户名;
/**
*@返回ID
*/
公共整数getID(){
返回ID;
}
/**
*@param-ID
*要设置的ID
*/
公共无效集合ID(整数ID){
ID=ID;
}
/**
*@返回用户名
*/
公共字符串getUsername(){
返回用户名;
}
/**
*@param用户名
*要设置的用户名
*/
public void setUsername(字符串用户名){
this.username=用户名;
}
}
}
然后像这样使用BaseExpandableListAdapter,根据需要进行更改和添加视图:
import java.util.ArrayList;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
public class ResponseAdapter extends BaseExpandableListAdapter {
private ArrayList<ResponseObject> responseList = new ArrayList<ResponseObject>();
public ResponseAdapter(ArrayList<ResponseObject> responseObject) {
this.responseList = responseObject;
}
@Override
public Object getChild(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
int ID = responseList.get(groupPosition).getEmail().get(childPosition)
.getID();
String username = responseList.get(groupPosition).getEmail()
.get(childPosition).getUsername();
return null;
}
@Override
public int getChildrenCount(int groupPosition) {
return responseList.get(groupPosition).getEmail().size();
}
@Override
public Object getGroup(int groupPosition) {
// TODO Auto-generated method stub
return null;
}
@Override
public int getGroupCount() {
return responseList.size();
}
@Override
public long getGroupId(int groupPosition) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View parent, ViewGroup viewGroup) {
// Email group goes here
return null;
}
@Override
public boolean hasStableIds() {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean isChildSelectable(int arg0, int arg1) {
// TODO Auto-generated method stub
return false;
}
}
import java.util.ArrayList;
导入android.view.view;
导入android.view.ViewGroup;
导入android.widget.BaseExpandableListAdapter;
公共类ResponseAdapter扩展了BaseExpandableListAdapter{
private ArrayList responseList=新建ArrayList();
公共响应适配器(ArrayList responseObject){
this.responseList=响应对象;
}
@凌驾
公共对象getChild(int-groupPosition,int-childPosition){
//TODO自动生成的方法存根
返回null;
}
@凌驾
公共长getChildId(int-groupPosition,int-childPosition){
//TODO自动生成的方法存根
返回0;
}
@凌驾
公共视图getChildView(int-groupPosition、int-childPosition、,
布尔值isLastChild、视图转换视图、视图组父级){
int ID=responseList.get(groupPosition).getEmail().get(childPosition)
.getID();
字符串username=responseList.get(groupPosition.getEmail())
.get(childPosition.getUsername();
返回null;
}
@凌驾
公共整数getChildrenCount(整数组位置){
返回responseList.get(groupPosition.getEmail().size();
}
@凌驾
公共对象getGroup(int-groupPosition){
//TODO自动生成m