Question

EventHome.java的AsyncTask

class LoadProfile extends AsyncTask<String, String, String> {
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pDialog = new ProgressDialog(EventHome.this);
        pDialog.setMessage("Loading...");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(false);
        pDialog.show();
    }

    /**
     * getting Profile JSON
     * */
    protected String doInBackground(String... args) {
        // Building Parameters
        String json = null;
        try {
            List<NameValuePair> params = new ArrayList<NameValuePair>();

            HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost(PROFILE_URL);
            httppost.setEntity(new UrlEncodedFormEntity(params));

            // Execute HTTP Post Request
            HttpResponse response = httpclient.execute(httppost);
            HttpEntity resEntity = response.getEntity();
            json = EntityUtils.toString(resEntity);

            Log.i("All Events: ", json.toString());
        } catch (Exception e) {
            e.printStackTrace();
        }

        return json;
    }

    @Override
    protected void onPostExecute(String json) {
        super.onPostExecute(json);
        // dismiss the dialog after getting all products
        pDialog.dismiss();
        try{
        event_all = new JSONObject(json);
        JSONArray user = event_all.getJSONArray("events");
        JSONObject jb= user.getJSONObject(0);
        String name = jb.getString("name");
        String venue=jb.getString("location");
        String date=jb.getString("date_d");
        String descr=jb.getString("descr");
        String image1=jb.getString("images1");

        // displaying all data in textview

        tv3.setText(name);
        tv4.setText(venue+", "+date);
        tv5.setText(descr);
        }catch(Exception e)
        {
            e.printStackTrace();
        }

    }

}

json输出字符串

{"events":[{"id":"1","name":"Demo Event","descr":"This is a demo","date_d":"12\/27\/2014","time_t":"","images":"http:\/\/www.adagioinfotech.com\/event\/uploads\/event\/demo.png","images1":"http:\/\/www.adagioinfotech.com\/event\/uploads\/event\/demo1.png","location":"Ernakulam","publish":"1"},{"id":"2","name":"Flower Show","descr":"xfvslkdfvsw fvgersdgvel fgvmerlkgjer fgertgkjerltgf dfrgergt","date_d":"12\/29\/2014","time_t":"","images":"http:\/\/www.adagioinfotech.com\/event\/uploads\/event\/demo.png","images1":"http:\/\/www.adagioinfotech.com\/event\/uploads\/event\/demo1.png","location":"Thodupuzha","publish":"1"},{"id":"3","name":"Cultural Event","descr":"sfsdnfkjn sdfrelegkrg fdgvlkgvjmer fdgbelkrek dferlkgelrk dfgerge","date_d":"12\/30\/2014","time_t":"","images":"http:\/\/www.adagioinfotech.com\/event\/uploads\/event\/demo.png","images1":"http:\/\/www.adagioinfotech.com\/event\/uploads\/event\/demo1.png","location":"Idukki","publish":"1"}]}

我想显示json值的图像。我怎么能这样做。

Answer 1

尝试使用picasso这样加载图片

@Override
protected void onPostExecute(String json) {
   super.onPostExecute(json);
   // dismiss the dialog after getting all products
   pDialog.dismiss();
   try{
        event_all = new JSONObject(json);
        JSONArray user = event_all.getJSONArray("events");
        JSONObject jb= user.getJSONObject(0);
        String name = jb.getString("name");
        String venue=jb.getString("location");
        String date=jb.getString("date_d");
        String descr=jb.getString("descr");
        String image1=jb.getString("images1");

        // displaying all data in textview

        tv3.setText(name);
        tv4.setText(venue+", "+date);
        tv5.setText(descr);
        if(image1 != null && !image1.equalsIgnoreCase(""))
              Picasso.with(EventHome.this).load(image1).into(iv7);
     }catch(Exception e)
     {
         e.printStackTrace();
     }

}

将picasso jar放在项目的libs文件夹中，或将其添加到build.gradle文件中的依赖项中（参见Picasso site）

Answer 2

试试这个

protected void onPostExecute(String json) { .....

ImageLoader imageLoader = ImageLoader.getInstance();
DisplayImageOptions options = new DisplayImageOptions.Builder().cacheInMemory(true)
.cacheOnDisc(true).resetViewBeforeLoading(true)
.showImageForEmptyUri(fallback)
.showImageOnFail(fallback)
.showImageOnLoading(fallback).build();

//initialize image view
ImageView imageView = (ImageView) findViewById(R.id.imageView1)

//download and display image from url
imageLoader.displayImage(image1, imageView, options);

使用json-android显示来自url的图像

2 个答案: