Question

我在我的应用程序中使用了视图。我想使用POST方法在列表中显示图像。我通过POST方法获取了图像网址但无法在列表中显示它。我的代码片段的某些部分就在这里......

 private class GetContacts extends AsyncTask<Void, Void, Void> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            // Showing progress dialog
            pDialog = new ProgressDialog(Home1.this);
            pDialog.setMessage("Please wait....");
            pDialog.setCancelable(false);
            pDialog.show();

        }

        @Override
        protected Void doInBackground(Void... arg0) {
            // Creating service handler class instance
            ServiceHandler1 sh = new ServiceHandler1(apikey, latitude, longitude);


            // Making a request to url and getting response
            String jsonStr = sh.makeServiceCall(url, ServiceHandler1.POST);

            Log.d("Response: ", "> " + jsonStr);


            if (jsonStr != null) {
                try {
                    JSONObject jsonObj = new JSONObject(jsonStr);

                    // Getting JSON Array node
                    contacts = jsonObj.getJSONArray(TAG_CONTACTS);

                    // looping through All Contacts
                    for (int i = 0; i < contacts.length(); i++) {
                        JSONObject c = contacts.getJSONObject(i);

                        String username = c.getString(TAG_USERNAME);
                        String name = c.getString(TAG_NAME);
                        String email = c.getString(TAG_EMAIL);
                        String address = c.getString(TAG_ADDRESS);
                        String contact_number = c.getString(TAG_CONTACT_NUMBER);
                        String postalcode = c.getString(TAG_POSTAL_CODE);
                        String image = c.getString(TAG_IMAGE);
                        Log.v("as.",image);

                        ImageLoader imageLoader = new ImageLoader(getApplicationContext());
                        ImageView Profileimage = (ImageView) findViewById(R.id.logo);
                        imageLoader.DisplayImage(image, Profileimage);


                        // tmp hashmap for single contact
                        HashMap<String, String> contact = new HashMap<String, String>();

                        // adding each child node to HashMap key => value

                        contact.put(TAG_NAME, name);
                        contact.put(TAG_IMAGE, image);
                        contact.put(TAG_EMAIL, email);
                        // contact.put(TAG_ADDRESS, address);
                        contact.put(TAG_ADDRESS, address);
                        // adding contact to contact list
                        contact.put(TAG_USERNAME, username);
                        contact.put(TAG_POSTAL_CODE, postalcode);
                        contact.put(TAG_CONTACT_NUMBER, contact_number);

                        contactList.add(contact);


                    }
                } 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();

            ListAdapter adapter = new SimpleAdapter(
                    Home1.this, contactList,
                    R.layout.list_item1, new String[]{TAG_EMAIL, TAG_USERNAME, TAG_ADDRESS, TAG_POSTAL_CODE, TAG_CONTACT_NUMBER,
            }, new int[]{
                   R.id.company, R.id.description, R.id.address, R.id.operating_hours, R.id.contact});





            setListAdapter(adapter);
        }

    }

我使用图片加载器类转换图片网址...伙计们请帮帮我

请建议我如何在postExecute（）...

中解析图像

  @Override
        protected void onPostExecute(Void result) {
            super.onPostExecute(result);
            // Dismiss the progress dialog
            if (pDialog.isShowing())
                pDialog.dismiss();

            ListAdapter adapter = new SimpleAdapter(
                    Home1.this, contactList,
                    R.layout.list_item1, new String[]{TAG_EMAIL, TAG_USERNAME, TAG_ADDRESS, TAG_POSTAL_CODE, TAG_CONTACT_NUMBER,
            }, new int[]{
                   R.id.company, R.id.description, R.id.address, R.id.operating_hours, R.id.contact});


            ImageLoader imageLoader = new ImageLoader(getApplicationContext());
            ImageView Profileimage = (ImageView) findViewById(R.id.logo);
            imageLoader.DisplayImage(TAG_IMAGE, Profileimage);



            setListAdapter(adapter);
        }

    }

Answer 1

您需要创建自定义Listview适配器才能完成此任务。请检查loading-image-asynchronously-in-android-listview链接以创建一个。在post post方法中，你必须创建适配器对象，然后传递包含图像URL的contactList数组列表。

在链接中，您将获得在listview中显示图片的完整代码，其中包含使用Imageloader库下载图片的代码。

如果有帮助，请告诉我。

无法通过imageloader类在listview中显示图像

1 个答案: