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我正在學習JsonParsing。在這我有一些category_list陣列。我解析數組中的數據並將其綁定到android中的listView。從那個列表中，我還需要對該Web服務進行API調用，並檢查sub-category是否存在？如果沒有子類別，那麼它將是product list。我已經嘗試如下，但我無法從productList解析json如何檢查天氣JsonArray值可用或不從web服務的android並獲取其數據？
如何決定或給我任何解決方案的邏輯。我的代碼如下：
main.java
package com.epe.yehki.ui;
import java.util.ArrayList;
import java.util.HashMap;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.epe.yehki.backend.ServiceHandler;
import com.epe.yehki.uc.Header;
import com.example.yehki.R;
import android.R.string;
import android.app.Activity;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;
public class SubCategoryActivity extends ListActivity {
// SUB CATEGORIES...
private static final String TAG_CAT_LlIS = "categories_list";
private static final String TAG_CAT_ID = "category_id";
private static final String TAG_CAT_NAME = "category_name";
int flag;
public Header header;
public TextView title;
// PRODUCTS....
private static final String TAG_PRODUCT_ID = "product_id";
private static final String TAG_PRODUCT_LlST = "product_list";
private static final String TAG_PRODUCT_NAME = "product_name";
private static final String TAG_PRODUCT_IMG = "image";
private static final String TAG_PRODUCT_DESCRIPTION = "detail_description";
// contacts JSONArray
JSONArray subcategories = null;
JSONArray products = null;
public String catid;
public String id;
String name;
JSONObject jsonObj;
// Hashmap for ListView
ArrayList<HashMap<String, String>> subcategoryList;
ArrayList<HashMap<String, String>> productList;
private ProgressDialog pDialog;
// URL to get contacts JSON
private static String url = "http://yehki.epagestore.in/app_api/categories.php";
private static String mainurl = "http://yehki.epagestore.in/";
public String suburl = "";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sub);
this.header = (Header) findViewById(R.id.headersubcat);
title = (TextView) findViewById(R.id.title);
// getting intent data
Intent in = getIntent();
// Get JSON values from previous intent
try {
catid = in.getStringExtra(TAG_CAT_ID);
name = in.getStringExtra(TAG_CAT_NAME);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("::::::::::::::MY CATEGORY ID::::::::::::::IN SUB "
+ catid);
subcategoryList = new ArrayList<HashMap<String, String>>();
suburl = "http://yehki.epagestore.in/app_api/categories.php?"
+ TAG_CAT_ID + "=" + catid;
System.out.println("::::::::::::::::MY SUBCATEGORY URL::::::::::::"
+ suburl);
title.setText(name);
// Displaying all values on the screen
ListView lv = getListView();
new GetSubCategories().execute();
// Listview on item click listener
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
String catname = ((TextView) view.findViewById(R.id.name))
.getText().toString();
Intent in = new Intent(getApplicationContext(),
SubCategoryTwoActivity.class);
in.putExtra(TAG_CAT_NAME, catname);
in.putExtra(TAG_CAT_ID, catid);
startActivity(in);
}
});
}
private class GetSubCategories extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(SubCategoryActivity.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected Void doInBackground(Void... arg0) {
// Creating service handler class instance
ServiceHandler sh = new ServiceHandler();
System.out.println(":::::::::::::::::::SUB URL:::::::::::::::::"
+ suburl);
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(suburl, ServiceHandler.GET);
Log.d("Response: ", "> " + jsonStr);
if (jsonStr != null) {
try {
jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
if (jsonObj.has(TAG_CAT_LlIS)) {
subcategories = jsonObj.getJSONArray(TAG_CAT_LlIS);
if (subcategories != null
&& subcategories.length() != 0) {
// looping through All Contacts
flag = 0;
System.out
.println(":::::::::::FLAG IN SUB:::::::::::"
+ subcategories.length());
for (int i = 0; i < subcategories.length(); i++) {
JSONObject c = subcategories.getJSONObject(i);
id = c.getString(TAG_CAT_ID);
String name = c.getString(TAG_CAT_NAME);
// tmp hashmap for single category
HashMap<String, String> subcategory = new HashMap<String, String>();
// adding each child node to HashMap key =>
// value
subcategory.put(TAG_CAT_ID, id);
subcategory.put(TAG_CAT_NAME, name);
// adding contact to contact list
subcategoryList.add(subcategory);
}
}
} else {
flag = 1;
products = jsonObj.getJSONArray(TAG_PRODUCT_LlST);
System.out
.println("==========SIZE OF MY ARRAY PRODUCT LIST==================="
+ products.length());
System.out
.println(":::::::::::::::::::Product array:::::::::::::::"
+ products);
// looping through All Contacts
for (int i = 0; i < products.length(); i++) {
JSONObject p = products.getJSONObject(i);
String proId = p.getString(TAG_PRODUCT_ID);
String proName = p.getString(TAG_PRODUCT_NAME);
String productImg = p.getString(TAG_PRODUCT_IMG);
String productDesc = p
.getString(TAG_PRODUCT_DESCRIPTION);
System.out
.println("::::::::::::::::MY PRODUCT DETAILS::::::::::::::"
+ TAG_PRODUCT_ID
+ " PRODUCT NAME "
+ TAG_PRODUCT_NAME
+ " PRODUCT_DESCRIPTION "
+ TAG_PRODUCT_DESCRIPTION
+ " PRODUCT IMAGE "
+ TAG_PRODUCT_IMG);
HashMap<String, String> product = new HashMap<String, String>();
// adding each child node to HashMap key => value
// product.put(TAG_PRODUCT_ID, proId);
product.put(TAG_PRODUCT_NAME, proName);
product.put(TAG_PRODUCT_DESCRIPTION, productDesc);
/*
* product.put(TAG_PRODUCT_IMG, productImg);
*/
productList.add(product);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
*
* */
if (flag == 0) {
ListAdapter adapter = new SimpleAdapter(
SubCategoryActivity.this, subcategoryList,
R.layout.list_item, new String[] { TAG_CAT_NAME },
new int[] { R.id.name });
setListAdapter(adapter);
} else {
ListAdapter adapter = new SimpleAdapter(
SubCategoryActivity.this, subcategoryList,
R.layout.activity_single_produt, new String[] {
TAG_PRODUCT_NAME, TAG_PRODUCT_DESCRIPTION,
TAG_PRODUCT_IMG }, new int[] {
R.id.product_label, R.id.product_desc,
R.id.iv_product_img });
setListAdapter(adapter);
}
}
}
}
@ SMR-謝謝you.sir –