我们正在开发一个产品，我们必须在其中解析一个 json 数组并将其显示在一个具有 3 个级别的可扩展列表视图中。我尝试了这个概念，我只达到了我无法进入下两个级别的第一级。我是 android 开发新手，请帮助我实现这一目标。我的代码如下....
package com.example.expanadbalelistview;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.HashMap;
import org.json.JSONArray;
import org.json.JSONObject;
import android.app.ActionBar.LayoutParams;
import android.app.Activity;
import android.app.ExpandableListActivity;
import android.content.Context;
import android.graphics.Color;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ListView;
import android.widget.TextView;
public class MainActivity extends Activity {
int aa;
ArrayList<String[]> subcats1;
String results;
JSONArray jarray,jk;
ExpandableListView explvlist;
String top_cats[];
String sub_cats[];
private LayoutInflater inflater;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
inflater = LayoutInflater.from( MainActivity.this);
new as(aa).execute();
explvlist = (ExpandableListView) findViewById(R.id.ParentLevel222);
}
public class ParentLevel extends BaseExpandableListAdapter {
@Override
public Object getChild(int arg0, int arg1)
{
return arg1;
}
@Override
public long getChildId(int groupPosition, int childPosition)
{
return childPosition;
}
@Override
public View getChildView(int groupPosition, int childPosition,boolean isLastChild, View convertView, ViewGroup parent)
{
Log.e("grp first",String.valueOf(groupPosition));
View v = null;
if( convertView != null )
v = convertView;
else
v = inflater.inflate(R.layout.child_row1, parent, false);
TextView colorGroup = (TextView)v.findViewById( R.id.grp_child );
colorGroup.setText(subcats.get(groupPosition)[childposition]);
Log.e("kkk",String.valueOf(k));
return v;
//CustExpListview SecondLevelexplv = new //CustExpListview(MainActivity.this);
// SecondLevelexplv.setAdapter(new SecondLevelAdapter());
//SecondLevelexplv.setGroupIndicator(null);
//return SecondLevelexplv;
}
@Override
public int getChildrenCount(int groupPosition)
{
Log.e("ss",String.valueOf(subcats1.get(groupPosition).length));
return subcats1.get(groupPosition).length;
}
@Override
public Object getGroup(int groupPosition)
{
return groupPosition;
}
@Override
public int getGroupCount()
{
return jarray.length();
}
@Override
public long getGroupId(int groupPosition)
{
Log.e("group pos",String.valueOf(groupPosition));
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent)
{
Log.e("group",String.valueOf(groupPosition));
View v = null;
if( convertView != null )
v = convertView;
else
v = inflater.inflate(R.layout.group_row, parent, false);
TextView colorGroup = (TextView)v.findViewById( R.id.row_name );
colorGroup.setText(top_cats[groupPosition]);
return v;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
public class CustExpListview extends ExpandableListView {
int intGroupPosition, intChildPosition, intGroupid;
public CustExpListview(Context context)
{
super(context);
Log.e("intGroupPostion",String.valueOf(intGroupPosition));
}
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
widthMeasureSpec = MeasureSpec.makeMeasureSpec(960,
MeasureSpec.AT_MOST);
heightMeasureSpec = MeasureSpec.makeMeasureSpec(600,
MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
public class SecondLevelAdapter extends BaseExpandableListAdapter
{
int k=0;
@Override
public Object getChild(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public long getChildId(int groupPosition, int childPosition)
{
return childPosition;
}
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
TextView tv = new TextView(MainActivity.this);
tv.setText("child");
tv.setTextColor(Color.BLACK);
tv.setTextSize(20);
tv.setPadding(15, 5, 5, 5);
tv.setBackgroundColor(Color.YELLOW);
tv.setLayoutParams(new ListView.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
return tv;
}
@Override
public int getChildrenCount(int groupPosition)
{
return 5;
}
@Override
public Object getGroup(int groupPosition)
{
return groupPosition;
}
@Override
public int getGroupCount() {
return 1;
}
@Override
public long getGroupId(int groupPosition)
{
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent)
{
View v=null;
return v;
}
@Override
public boolean hasStableIds() {
// TODO Auto-generated method stub
return true;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return true;
}
}
public class as extends AsyncTask
{
public as(int aa)
{
}
@Override
protected Object doInBackground(Object... params)
{
try {
URL twitter = new URL("https://testaws.bigbasket.com/mapi/v0.0.1/browse-category/");
System.out.println(twitter);
URLConnection tc = twitter.openConnection();
BufferedReader in = new BufferedReader(new InputStreamReader(tc.getInputStream()));
String line;
while ((line = in.readLine()) != null)
{
jarray=new JSONArray(line);
top_cats=new String[jarray.length()];
subcats1 = new ArrayList<String[]>();
for (int i = 0; i < jarray.length(); i++)
{
JSONObject jo = (JSONObject) jarray.get(i);
String top=(jo.getString("top_category"));
jk =new JSONArray(jo.getString("sub_cats"));
int comat=top.indexOf(",");
top=top.substring(1, comat);
top=top.replace("<br\\/>", "");
top=top.replaceAll(""+'"'+"", "");
Log.e("tt",top);
top_cats[i]=top;
sub_cats=new String[jk.length()];
for(int j=0;j<jk.length();j++)
{
Log.e("de",String.valueOf(j));
JSONObject jo1 = (JSONObject) jk.get(j);
String top1=(jo1.getString("sub_category"));
sub_cats[j]=top1;
Log.e("dd",String.valueOf(sub_cats[j]));
}
subcats1.add(i,sub_cats);
}
}
}
catch(Exception e)
{
}
return null;
}
@Override
protected void onPostExecute(Object result)
{
explvlist.setAdapter(new ParentLevel());
}
@Override
protected void onPreExecute()
{}
}
}
请帮我 。提前致谢....
json数组
[
{
"top_category": [
"Fruits & <br/> Vegetables",
"fruits-vegetables"
],
"sub_cats": [
{
"cats": [],
"sub_category": [
"Frozen Vegetables",
"frozen-veg"
]
},
{
"cats": [
{
"cat": [
"Apple",
"apple"
]
},
{
"cat": [
"Banana",
"bananas"
]
},
{
"cat": [
"Exotic Fruits",
"exotic-fruits"
]
},
{
"cat": [
"Melon",
"melon"
]
},
{
"cat": [
"Oranges & Sweet Lime",
"citrus-fruits"
]
},
{
"cat": [
"Other Fruits",
"other-fruits"
]
}
],
"sub_category": [
"Fruits",
"fruits"
]
},
{
"cats": [],
"sub_category": [
"Organic F&V",
"organic-fv"
]
},
{
"cats": [
{
"cat": [
"Beans",
"beans"
]
},
{
"cat": [
"Brinjals",
"brinjals"
]
},
{
"cat": [
"Chilli, Lemon, Garlic & Ginger",
"chilli-lemon-garlic-ginger"
]
},
{
"cat": [
"Exotic Vegetables",
"exotic-vegetables"
]
},
{
"cat": [
"Gourd & Cucumber",
"gourds-cucumbers"
]
},
{
"cat": [
"Leafy Vegetables",
"leafy-vegetables"
]
},
{
"cat": [
"Other Vegetables",
"other-vegetables"
]
},
{
"cat": [
"Potato, Onion & Tomato",
"potato-onion-tomato"
]
},
{
"cat": [
"Root Vegetables",
"root-vegetables"
]
}
],
"sub_category": [
"Vegetables",
"vegetables"
]
}
]
},
{
"top_category": [
"Bread <br/> Dairy & Eggs",
"bread-dairy-eggs"
],
"sub_cats": [
{
"cats": [
{
"cat": [
"Bread",
"breads"
]
},
{
"cat": [
"Buns & Pavs",
"buns-cakes"
]
},
{
"cat": [
"Cakes",
"cakes"
]
}
],
"sub_category": [
"Bread & Bakery",
"bread-bakery"
]
},
{
"cats": [
{
"cat": [
"Butter & Cream",
"butter"
]
},
{
"cat": [
"Cheese",
"cheese"
]
},
{
"cat": [
"Condensed Milk",
"condensed-milk"
]
},
{
"cat": [
"Curds & Buttermilk",
"curds-buttermilk"
]
},
{
"cat": [
"Milk",
"milk"
]
},
{
"cat": [
"Milk Drinks",
"milk-milk-drinks"
]
},
{
"cat": [
"Paneer & Tofu",
"paneer-tofu"
]
},
{
"cat": [
"Soya Drinks",
"soya-drinks"
]
},
{
"cat": [
"Yogurt & Lassi",
"yogurt-lassi"
]
}
],
"sub_category": [
"Dairy Products",
"dairy-products"
]
}
]
},
{
"top_category": [
"Household",
"household"
],
"sub_cats": [
{
"cats": [
{
"cat": [
"Brooms",
"brooms"
]
},
{
"cat": [
"Cleaning Agents",
"cleaning-agents"
]
},
{
"cat": [
"Tissues",
"tissues"
]
}
],
"sub_category": [
"Cleaning Articles",
"cleaning-articles"
]
},
{
"cats": [
{
"cat": [
"Washing Bars",
"washing-bars"
]
},
{
"cat": [
"Washing Liquids",
"washing-liquids"
]
},
{
"cat": [
"Washing Powders",
"washing-powders"
]
}
],
"sub_category": [
"Detergents",
"detergents"
]
},
{
"cats": [
{
"cat": [
"Batteries/Cells",
"batteriescells"
]
},
{
"cat": [
"CFL's",
"cfls"
]
}
],
"sub_category": [
"Electricals",
"electricals"
]
},
{
"cats": [],
"sub_category": [
"Garbage Bags",
"garbage-bags"
]
},
{
"cats": [
{
"cat": [
"Disposable Tableware",
"disposable-tableware"
]
},
{
"cat": [
"Other Kitchenware",
"other-kitchenware"
]
}
],
"sub_category": [
"Kitchenware",
"kitchenware"
]
},
{
"cats": [],
"sub_category": [
"Pet Food",
"pet-food"
]
},
{
"cats": [],
"sub_category": [
"Plasticware",
"plasticware"
]
},
{
"cats": [],
"sub_category": [
"Pooja Needs",
"pooja-needs"
]
},
{
"cats": [],
"sub_category": [
"Shoe Care",
"shoe-care"
]
},
{
"cats": [
{
"cat": [
"Other Stationery",
"other-stationery"
]
},
{
"cat": [
"Printing Accessories",
"printing-accessories"
]
}
],
"sub_category": [
"Stationery",
"stationery"
]
}
]
},
{
"top_category": [
"Confectionery",
"confectionery"
],
"sub_cats": [
{
"cats": [],
"sub_category": [
"Biscuits",
"biscuits"
]
},
{
"cats": [],
"sub_category": [
"Chocolates",
"chocolates"
]
},
{
"cats": [],
"sub_category": [
"Cookies",
"cookies"
]
},
{
"cats": [
{
"cat": [
"Gums & Freshners",
"gums-freshners"
]
},
{
"cat": [
"Sweets",
"sweets"
]
},
{
"cat": [
"Toffees",
"toffees"
]
}
],
"sub_category": [
"Sweets & Candies",
"sweets-candies"
]
},
{
"cats": [],
"sub_category": [
"Wafers",
"wafers"
]
}
]
},
{
"top_category": [
"Meat",
"meat"
],
"sub_cats": [
{
"cats": [
{
"cat": [
"Fresh Chicken",
"fresh-chicken"
]
}
],
"sub_category": [
"Chicken",
"chicken"
]
},
{
"cats": [
{
"cat": [
"Fresh Mutton",
"fresh-mutton"
]
}
],
"sub_category": [
"Mutton",
"mutton"
]
},
{
"cats": [
{
"cat": [
"Fresh",
"fresh"
]
}
],
"sub_category": [
"Pork & Other Meats",
"pork-other-meats"
]
},
{
"cats": [
{
"cat": [
"Fish",
"fish"
]
},
{
"cat": [
"Other Seafood",
"other-seafood"
]
}
],
"sub_category": [
"Seafood",
"seafood"
]
}
]
}
]
我改变了我的代码。现在我得到了第二级。但是第三层有一个问题。我无法创建groupView()到第二级。因此我无法建立第三级视图。请提前帮助谢谢