我正在开发Android中的客户端 - 服务器项目。我需要解析给定URL中的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，我必须将主JsonArray放置在ExpandableListView中的群组中。它工作正常。
我可以从JSON中找出有多少组进入但是当我尝试根据来自服务器的数据将子进入每个组时出现问题。我的代码只将第一个孩子放在第一个组中，但当我点击第二个孩子时，它会显示错误。
我需要在相应的组中放置“ID”和“用户名”（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，但是当我单击第二个组时，它会崩溃。任何形式的帮助都将受到高度赞赏。
所以，我的查询是，如何根据服务器数据动态创建组并将子数据放在每个子项中？
以下是日志中的错误：
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)
JSON response
{ "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"},
]
}
这只是JSON响应的一个示例。真实的回复有很多标签。
ExpandableListActivity的代码示例如下：
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);
}
}
答案 0 :(得分：1)
这是我将如何做到的。当然你可以像解析一样使用解析。但是，我会使用jackson库并根据响应创建一个对象类，并使用ObjectMapper，它看起来更优雅，节省了解析时间。您可以根据需要在此处添加更多字段，例如内部传真和电子邮件类以及列表：
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;
}
}
}
然后像这样使用BaseExpandableListAdapter，根据需要进行更改并添加视图：
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;
}
}