Android 从网站获取数据和图像到ListView

我正在运行以下代码，通过JSON将数据和图像从网站获取到ListView

现在，它显示了同样的错误

你能帮我找到问题吗

        public class FoodView extends ListActivity 
        {
            private ProgressDialog pDialog;


            JSONParser jParser = new JSONParser();

            ArrayList<HashMap<String, String>> productsList;

            private static String url_all_products = "http://ambrogroup.com/app/index/file/food";
        private static final String TAG_SUCCESS = "success";
        private static final String TAG_PRODUCTS = "products";
        private static final String TAG_PID = "pid";
        private static final String TAG_NAME = "name";
        private static final String TAG_IMAGE = "img";
        private static final String TAG_DESTINATION = "destination";
        private static final String TAG_PRICE = "price";

            JSONArray products = null;

        @Override
            public void onCreate(Bundle savedInstanceState) 
            {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.food_view);

        //      productsList = new ArrayList<HashMap<String, String>>();        // Hashmap for ListView
        new LoadAllProducts().execute();                                // Loading products in Background Thread by explicit function

        ListView listview = getListView();                                  // Get listview



        listview.setOnItemClickListener(new OnItemClickListener() {         // on seleting single product // launching Edit Product Screen
        @Override
                    public void onItemClick(AdapterView<?> parent, View view, int position, long id) 
                    {
                        //getting values from selected ListItem
                        String pid = ((TextView) view.findViewById(R.id.pid)).getText().toString();
                        String pname = ((TextView) view.findViewById(R.id.name)).getText().toString();
                        String pimg = ((TextView) view.findViewById(R.id.img)).getText().toString();
                        String pdestination = ((TextView) view.findViewById(R.id.destination)).getText().toString();
                        String pprice = ((TextView) view.findViewById(R.id.price)).getText().toString();
                    }
                });

            }

        class LoadAllProducts extends AsyncTask<String, String, String>
        {       
            ListView listView;
            ArrayList<ItemList> listArray = new ArrayList<ItemList>();
            CustomListViewAdapter customGridAdapter;

                @Override
                protected void onPreExecute() 
                {
                    super.onPreExecute();
                    pDialog = new ProgressDialog(FoodView.this);
                    pDialog.setMessage("Loading list. Please wait...");
                    pDialog.setIndeterminate(false);
                    pDialog.setCancelable(false);
                    pDialog.show(); 
                }

        /**
         * getting All products from url
         * */
        protected String doInBackground(String... args) {
            // Building Parameters
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        // getting JSON string from URL
        JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params);

        // Check your log cat for JSON reponse
        Log.d("Getting all the list : ", json.toString());

        try {
            // Checking for SUCCESS TAG
            int success = json.getInt(TAG_SUCCESS);

            if (success == 1) 
            {
                products = json.getJSONArray(TAG_PRODUCTS);
                String[] mStrings= new String[products.length()];
                for (int i = 0; i < products.length(); i++) 
                {
                    JSONObject c = products.getJSONObject(i);
                    String id = c.getString(TAG_PID);
                    String name = c.getString(TAG_NAME);
                    String img = c.getString(TAG_IMAGE);
                    String destination = c.getString(TAG_DESTINATION);
                    String price = c.getString(TAG_PRICE);

                    mStrings[i] = img;
                    String urldisplay = mStrings[i];
                    Bitmap mIcon11 = null;
                      try {
                        InputStream in = new java.net.URL(urldisplay).openStream();
                        mIcon11 = BitmapFactory.decodeStream(in);
                      } catch (Exception e) {
                          Log.e("Error", e.getMessage());
                                      e.printStackTrace();
                                  }
                               listArray.add(new ItemList(mIcon11,id,name,destination,price));

                               listView = (ListView) findViewById(R.id.list_item);
                               customGridAdapter = new CustomListViewAdapter(FoodView.this, R.layout.row_grid, listArray);
                               listView.setAdapter(customGridAdapter);

                            }
                        } 
                        else 
                        {

                        }
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }

                    return null;
                }



            }
        }

---

您不应该在doInBackGround方法中将Adapter设置为listview。您可以在asyncTask中调用此postExecute

 protected String postExecute()
 {
     listView = (ListView) findViewById(R.id.list_item);
     customGridAdapter = new CustomListViewAdapter(FoodView.this, R.layout.row_grid, listArray);
     listView.setAdapter(customGridAdapter);
 }

---

删除LoadAllProducts类中的ListView。在new LoadAllProducts.execute之前声明FoodView类的ListView

您在FoodView.java第136行做什么？某些内容为空。您收到此错误是因为您正在doInBackground方法中使用适配器设置listview。。您可以使用onPostExecute，否则请使用RunUnuithRead希望这对您有所帮助我按照您所说的做了。但同样的错误依然存在。04-24 05:34:15.098:W/System.err1123:at java.util.concurrent.ThreadPoolExecutor$Worker.runThreadPoolExecutor.java:587 04-24 05:34:15.108:W/System.err1123:at java.lang.Thread.runThread.java:841 04-24 05:34:15.108:E/Error1123：找不到协议：www.ambrogroup.com/assets/brands/foods/comingson.jpg 04-24 05:34:15.128:W/System.err1123：java.net.MalformedURLException:找不到协议：www.ambrogroup.com/assets/brands/foods/comingsoon.jpgdid u对doInBackgrounduse lazyloader library中的这些行进行了评论用于从服务器获取图像是的，我发表了评论。。但为什么会出现此错误E/Error1123:Protocol not found:www.ambrogroup.com/assets/brands/foods/comingsoon.jpg即使url路径是fethced。以上问题的答案是使用http://而不是www。。这就是错误的原因。。谢谢大家的回答。

 protected String postExecute()
 {
     listView = (ListView) findViewById(R.id.list_item);
     customGridAdapter = new CustomListViewAdapter(FoodView.this, R.layout.row_grid, listArray);
     listView.setAdapter(customGridAdapter);
 }