재사용 HttpUrlConnection

JSON에서 이미지 경로를 가져 오는 gridview 애플리케이션을 만들었습니다. 내 gridview 2 이미지를 저장했다. 이미지 2 개 중 하나만 얻을 수 있습니다. 클래스 ImageLoaderTaskimgUrl처럼 사용하려면 String frameUrl을 만들었지 만 사용 방법은 모르겠다. 나는 많은 해결책을 찾으려고 노력했지만 그렇게 할 수는 없다.재사용 HttpUrlConnection

HttpUrlConnection 연결을 다시 사용하여 gridview에 표시 할 이미지를 하나 더 얻으려면 어떻게해야합니까?

String strUrl = "http://192.168.10.104/adchara1/"; 
GridView gridView; 

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

    // Creating a new non-ui thread task to download json data 
    DownloadTask downloadTask = new DownloadTask(); 

    // Starting the download process 
    downloadTask.execute(strUrl); 

    gridView = (GridView) findViewById(R.id.lv_countries);   
    gridView.setOnItemClickListener(new OnItemClickListener() { 

     public void onItemClick(AdapterView<?> parent, View v, int positon, 
       long id) { 
      HashMap<String, Object> hm = (HashMap<String, Object>) gridView.getAdapter().getItem(positon); 
      String imgPath = (String) hm.get("photo"); //get downloaded image path 
      Intent i = new Intent(MainActivity.this, DisplayActivity.class); //start new Intent to another Activity. 
      i.putExtra("ClickedImagePath", imgPath); //put image link in intent. 
      startActivity(i); 
     } 
    }); 
} 

/** A method to download json data from url */ 
private String downloadUrl(String strUrl) throws IOException{ 
    String data = ""; 
    InputStream iStream = null; 

    HttpClient httpClient = new DefaultHttpClient(); 
    HttpPost httpPost = new HttpPost(strUrl); 
    ArrayList<NameValuePair> param = new ArrayList<NameValuePair>(); 
    try { 
     httpPost.setEntity(new UrlEncodedFormEntity(param)); 
     HttpResponse httpResponse = httpClient.execute(httpPost); 
     HttpEntity httpEntity = httpResponse.getEntity(); 
     iStream = httpEntity.getContent(); 
    } catch (Exception e) { 
     Log.e("log_tag", "Error in http connection " + e.toString()); 
    } 
    try { 
     BufferedReader br = new BufferedReader(new InputStreamReader(iStream)); 
     StringBuilder sb = new StringBuilder(); 
     String line = ""; 
     while((line = br.readLine()) != null){ 
      sb.append(line + "\n"); 
     } 
     iStream.close(); 
     data = sb.toString(); 
    } catch (Exception e) { 
     Log.e("log_tag", "Error converting result " + e.toString()); 
    } 
    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]); 
     }catch(Exception e){ 
      Log.d("Background Task",e.toString()); 
     } 
     return data; 
    } 

    @Override 
    protected void onPostExecute(String result) { 

     // The parsing of the xml data is done in a non-ui thread 
     GridViewLoaderTask gridViewLoaderTask = new GridViewLoaderTask(); 

     // Start parsing xml data 
     gridViewLoaderTask.execute(result); 
    } 
} 

/** AsyncTask to parse json data and load ListView */ 
private class GridViewLoaderTask 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{ 
      jObject = new JSONObject(strJson[0]); 
      CountryJSONParser countryJsonParser = new CountryJSONParser(); 
      countryJsonParser.parse(jObject); 
     }catch(Exception e){ 
      Log.d("JSON Exception1",e.toString()); 
     } 

     // Instantiating json parser class 
     CountryJSONParser countryJsonParser = new CountryJSONParser(); 

     // A list object to store the parsed countries list 
     List<HashMap<String, Object>> countries = null; 

     try{ 
      // Getting the parsed data as a List construct 
      countries = countryJsonParser.parse(jObject); 
     }catch(Exception e){ 
      Log.d("Exception",e.toString()); 
     } 

     // Keys used in Hashmap 
     String[] from = { "frame","photo"}; 

     // Ids of views in listview_layout 
     int[] to = { R.id.iv_frame,R.id.iv_photo}; 

     // Instantiating an adapter to store each items 
     // R.layout.listview_layout defines the layout of each item 
     SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), countries, R.layout.lv_layout, from, to); 
     return adapter; 
    } 

    /** Invoked by the Android on "doInBackground" is executed */ 
    protected void onPostExecute(SimpleAdapter adapter) { 

     // Setting adapter for the listview 
     gridView.setAdapter(adapter); 

     for(int i=0;i<adapter.getCount();i++){ 
      HashMap<String, Object> hm = (HashMap<String, Object>) adapter.getItem(i); 
      String frameUrl = (String) hm.get("frame_path"); 
      String imgUrl = (String) hm.get("photo_path"); 
      ImageLoaderTask imageLoaderTask = new ImageLoaderTask(); 

      HashMap<String, Object> hmDownload = new HashMap<String, Object>(); 
      hm.put("frame_path", frameUrl); 
      hm.put("photo_path",imgUrl); 
      hm.put("position", i); 

      // 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; 
      String imgUrl; 
      String frameUrl; 
      imgUrl = (String) hm[0].get("photo_path"); 
      frameUrl = (String) hm[0].get("frame_path"); 
      int position = (Integer) hm[0].get("position"); 

      URL url; 
      URL urlFrame; 
      try { 
       url = new URL(imgUrl); 
       urlFrame = new URL(frameUrl); 
       // 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(); 

       // Temporary file to store the downloaded image 
       File tmpFile = new File(cacheDirectory.getPath() + "/wpta_"+ position + ".png"); 

       // 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.PNG, 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("photo", tmpFile.getPath()); 
       hmBitmap.put("frame", 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 (MalformedURLException e) { 
       return null; 
      } catch (FileNotFoundException e) { 
       return null; 
      } catch (IOException e) { 
       return null; 
      } 
     } 

    @Override 
    protected void onPostExecute(HashMap<String, Object> result) { 
     // Getting the path to the downloaded image 
     String path = (String) result.get("photo"); 
     String framePath = (String) result.get("frame"); 
     // Getting the position of the downloaded image 
     int position = (Integer) result.get("position"); 

     // Getting adapter of the listview 
     SimpleAdapter adapter = (SimpleAdapter) gridView.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("photo",path); 
     hm.put("frame", framePath); 
     // Noticing listview about the dataset changes 
     adapter.notifyDataSetChanged(); 
    } 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    getMenuInflater().inflate(R.menu.activity_main, menu); 
    return true; 
} 
}

출처

2012-10-26 kongkea