坚持这个错误.. :( 这是我的代码.. json异常无法转换为jsonobject ..
这是我的Furniture.java文件。这是首先执行的主文件 我想将布局显示为列表视图，其中显示了徽标，家具名称及其价格。
public class Furniture extends Activity
{
TextView login;
ListView list;
Button b,search;
String s,s1="error";
int value;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.furniture);
String strUrl = "http://realroom.byethost24.com/realroom/furniture.php"
Log.d("c1 :", s1);
DownloadTask downloadTask = new DownloadTask();
downloadTask.execute(strUrl);
list = (ListView) findViewById(R.id.flist);
}
public boolean onCreateOptionsMenu(Menu menu)
{
// TODO Auto-generated method stub
super.onCreateOptionsMenu(menu);
MenuInflater blowup = getMenuInflater();
blowup.inflate(R.menu.menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
// TODO Auto-generated method stub
Intent i;
switch(item.getItemId())
{
case R.id.checkout:
i = new Intent(Furniture.this, Payment.class);
startActivity(i);
break;
case R.id.aboutUs:
i = new Intent(Furniture.this,AboutUs.class);
startActivity(i);
break;
case R.id.profile:
i = new Intent(Furniture.this,Profile.class);
startActivity(i);
break;
case R.id.help:
i = new Intent(Furniture.this,Help.class);
startActivity(i);
break;
}
return false;
}
private String downloadUrl(String strUrl) throws IOException
{
String data = "";
InputStream istream = null;
try
{
Log.d("c2",s1);
URL url = new URL(strUrl);
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.connect();
istream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(istream));
StringBuffer sb = new StringBuffer();
String line = "";
while((line=br.readLine())!=null)
{
sb.append(line);
}
data = sb.toString();
br.close();
}
catch(Exception e)
{
Log.e("c3",s1);
Log.d("Exception while downloading url", e.toString());
}
finally
{
istream.close();
}
return data;
}
/** AsyncTask to download json data */
private class DownloadTask extends AsyncTask<String, Integer, String>
{
String data = null;
@Override
protected String doInBackground(String... url)
{
try
{
data = downloadUrl(url[0]);
Log.d("c26",s1);
System.out.print(data);
}
catch(Exception e)
{
Log.d("Background Task",e.toString());
Log.e("c6",s1);
}
return data;
}
@Override
protected void onPostExecute(String result)
{
// The parsing of the xml data is done in a non-ui thread
ListViewLoaderTask listViewLoaderTask = new ListViewLoaderTask();
// Start parsing xml data
listViewLoaderTask.execute(result);
}
}
/** AsyncTask to parse json data and load ListView */
private class ListViewLoaderTask extends AsyncTask<String, Void, SimpleAdapter>
{
JSONObject jObject;
// Doing the parsing of xml data in a non-ui thread
@Override
protected SimpleAdapter doInBackground(String... strJson)
{
try
{
Log.d("c4",s1);
jObject = new JSONObject(strJson[0]);
Log.d("c44",s1);
FurnitureJsonParser furnitureJsonParser = new FurnitureJsonParser();
Log.d("c84",s1);
furnitureJsonParser.parse(jObject);
Log.d("c94",s1);
}
catch(Exception e)
{
Log.d("JSON Exception1",e.toString());
Log.e("c5",s1);
}
// Instantiating json parser class
FurnitureJsonParser furnitureJsonParser = new FurnitureJsonParser();
// A list object to store the parsed countries list
List<HashMap<String, Object>> furnitures = null;
try
{
// Getting the parsed data as a List construct
furnitures = furnitureJsonParser.parse(jObject);
}
catch(Exception e)
{
Log.d("Exception",e.toString());
Log.e("c7",s1);
}
// Keys used in Hashmap
String[] from = { "furniture","flag","details"};
// Ids of views in listview_layout
int[] to = { R.id.tv_fur,R.id.iv_icon,R.id.tv_fur_details};
// Instantiating an adapter to store each items
// R.layout.listview_layout defines the layout of each item
SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), furnitures, R.layout.f_item, from, to);
return adapter;
}
/** Invoked by the Android on "doInBackground" is executed */
@Override
protected void onPostExecute(SimpleAdapter adapter) {
// Setting adapter for the listview
list.setAdapter(adapter);
Log.d("c8",s);
for(int i=0;i<adapter.getCount();i++)
{
HashMap<String, Object> hm = (HashMap<String, Object>) adapter.getItem(i);
String imgUrl = (String) hm.get("flag_path");
ImageLoaderTask imageLoaderTask = new ImageLoaderTask();
HashMap<String, Object> hmDownload = new HashMap<String, Object>();
hm.put("flag_path",imgUrl);
hm.put("position", i);
Log.d("c9",s1);
// Starting ImageLoaderTask to download and populate image in the listview
imageLoaderTask.execute(hm);
}
}
}
/** AsyncTask to download and load an image in ListView */
private class ImageLoaderTask extends AsyncTask<HashMap<String, Object>, Void, HashMap<String, Object>>{
@Override
protected HashMap<String, Object> doInBackground(HashMap<String, Object>... hm) {
InputStream iStream=null;
Log.d("c10",s1);
String imgUrl = (String) hm[0].get("flag_path");
int position = (Integer) hm[0].get("position");
URL url;
Log.d("c11",s1);
try
{
url = new URL(imgUrl);
// Creating an http connection to communicate with url
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
// Getting Caching directory
File cacheDirectory = getBaseContext().getCacheDir();
Log.d("c12",s1);
// Temporary file to store the downloaded image
File tmpFile = new File(cacheDirectory.getPath() + "/wpta_"+position+".jpeg");
Log.d("c13",s1);
// The FileOutputStream to the temporary file
FileOutputStream fOutStream = new FileOutputStream(tmpFile);
// Creating a bitmap from the downloaded inputstream
Bitmap b = BitmapFactory.decodeStream(iStream);
// Writing the bitmap to the temporary file as png file
b.compress(Bitmap.CompressFormat.JPEG,100, fOutStream);
// Flush the FileOutputStream
fOutStream.flush();
//Close the FileOutputStream
fOutStream.close();
// Create a hashmap object to store image path and its position in the listview
HashMap<String, Object> hmBitmap = new HashMap<String, Object>();
// Storing the path to the temporary image file
hmBitmap.put("flag",tmpFile.getPath());
// Storing the position of the image in the listview
hmBitmap.put("position",position);
// Returning the HashMap object containing the image path and position
return hmBitmap;
}
catch (Exception e)
{
e.printStackTrace();
Log.e("c14",s1);
}
return null;
}
@Override
protected void onPostExecute(HashMap<String, Object> result)
{
Log.d("c15",s1);
// Getting the path to the downloaded image
String path = (String) result.get("flag");
// Getting the position of the downloaded image
int position = (Integer) result.get("position");
// Getting adapter of the listview
SimpleAdapter adapter = (SimpleAdapter ) list.getAdapter();
// Getting the hashmap object at the specified position of the listview
HashMap<String, Object> hm = (HashMap<String, Object>) adapter.getItem(position);
// Overwriting the existing path in the adapter
hm.put("flag",path);
// Noticing listview about the dataset changes
adapter.notifyDataSetChanged();
}
}
}
FurnitureJsonParser.java文件
此文件用于通过JSON解析数据
class FurnitureJsonParser
{
String s="error";
public List<HashMap<String,Object>> parse(JSONObject jObject)
{
JSONArray jFurnitures = null;
try
{
jFurnitures = jObject.getJSONArray("furnitures");
}
catch(JSONException e)
{
e.printStackTrace();
}
return getFurnitures(jFurnitures);
}
private List<HashMap<String, Object>> getFurnitures(JSONArray jFurnitures)
{
int furnitureCount = jFurnitures.length();
List<HashMap<String, Object>> furnitureList = new ArrayList<HashMap<String,Object>>();
HashMap<String, Object> furniture = null;
for(int i=0; i<furnitureCount;i++)
{
try
{
furniture = getFurniture((JSONObject)jFurnitures.get(i));
furnitureList.add(furniture);
Log.d("c18",s);
}
catch (JSONException e)
{
e.printStackTrace();
Log.e("c19",s);
}
}
return furnitureList;
}
private HashMap<String, Object> getFurniture(JSONObject jFurniture)
{
HashMap<String, Object> furniture = new HashMap<String, Object>();
String furnitureName = "";
String flag="";
String language = "";
try
{
furnitureName = jFurniture.getString("furniture_name");
flag = jFurniture.getString("furniture_image");
language = jFurniture.getString("furniture_cost");
String details = "Language : " + language + "\n"
furniture.put("furniture", furnitureName);
furniture.put("flag", R.drawable.blank);
furniture.put("flag_path", flag);
furniture.put("details", details);
Log.d("c20",s);
} catch (JSONException e)
{
e.printStackTrace();
Log.e("c21",s);
}
return furniture;
}
}
furniture.php文件
从数据库中获取信息并发送到android
的php文件<?php
include('config.php');
date_default_timezone_set("Asia/Calcutta");
$result1 = mysqli_query($con,"SELECT furniture_name, furniture_image, furniture_cost FROM tbl_furniture");
while($row=mysqli_fetch_array($result1))
{
//$row['store_name'];
//echo"<br>";
$back_android[]=$row;
}
print(json_encode($back_android));
?>
furniture.xml文件
家具档案的布局
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center_vertical"
tools:context=".MainActivity"
>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:background="@drawable/bg"
>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/search"
android:layout_gravity="center"
android:text="Search for Furniture"
android:textSize="10dp"
android:textColor="#AAAAAA"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/sf"
android:layout_gravity="center"
android:text="Select Furniture"
android:textSize="20dp"
android:textColor="#FFFFFF"
/>
<ListView
android:id="@+id/flist"
android:layout_width="fill_parent"
android:layout_height="402dp"
android:layout_marginTop="10dp"
android:layout_weight="0.18" >
</ListView>
</LinearLayout>
</ScrollView>
f_item.xml文件
在furniture.xml文件中列表视图的布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="@+id/tv_fur"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:textSize="20dp"
android:textStyle="bold" />
<ImageView
android:id="@+id/iv_icon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/tv_fur"
android:layout_centerVertical="true"
android:padding="5dp"
android:contentDescription="@string/str_iv_flag" />
<TextView
android:id="@+id/tv_fur_details"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/iv_icon"
android:layout_below="@id/tv_fur" />
</RelativeLayout>
答案 0 :(得分：0)
以下代码将根据此JSON
返回家具列表private List<Furniture> getThemFurnitures(String json){
List<Furniture> furnitures = new ArrayList<Furniture>();
try {
JSONObject jsonRoot = new JSONObject(json);
JSONArray jsonArray = jsonRoot.getJSONArray("furnitures");
for(int i = 0; i < jsonArray.length(); i++){
JSONObject furnitureObject = jsonArray.getJSONObject(i);
String storeID = furnitureObject.getString("store_id");
String name = furnitureObject.getString("furniture_name");
String cost = furnitureObject.getString("furniture_cost");
String image = furnitureObject.getString("furniture_image");
furnitures.add(new Furniture(storeID, name, cost, image));
}
} catch (JSONException e) {
e.printStackTrace();
}
return furnitures;
}