2017-02-23 45 views
0

Я пытаюсь создать представление списка. Я сделал это успешно без загрузки фотографий с URL-адреса без использования адаптера настраиваемого массива. Однако как я могу реализовать загрузку изображений из URL-адреса без использования адаптера пользовательского массива?Загрузка изображения из URL в ListView

Я пытаюсь использовать рабочие коды из этого thread, но он дает ошибку для держателя.

Ошибка Часть

icon = new ImageDownloaderTask(holder.imageView).execute(doctorPhoto); 

DoctorsActivity.java

public class DoctorsActivity extends AppCompatActivity { 

    private JSONArray arrayAdapter; 
    private static final String URL_FOR_BALANCE = "http://192.168.1.28/api2/doctors.php"; 

    String cancel_req_tag = "login"; 

    private ListView lv; 
    ArrayList<HashMap<String, String>> contactList; 
    Bitmap icon = null; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_doctors); 

     getSupportActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM); 
     getSupportActionBar().setCustomView(R.layout.toolbar_doctors); 

     getSupportActionBar().setBackgroundDrawable(new ColorDrawable(Color.parseColor("#003764"))); 
     getSupportActionBar().setDisplayHomeAsUpEnabled(false); 

     SharedPreferences sharedPreferences = getSharedPreferences(Config.SHARED_PREF_NAME, Context.MODE_PRIVATE); 
     final String pid = sharedPreferences.getString(Config.UID_SHARED_PREF, null); 

     contactList = new ArrayList<>(); 
     lv = (ListView) findViewById(R.id.list); 

     StringRequest strReq = new StringRequest(Request.Method.POST, 
       URL_FOR_BALANCE, new Response.Listener<String>() { 

      @Override 
      public void onResponse(String response) { 

       try { 
        JSONObject jObj = new JSONObject(response); 
        boolean error = jObj.getBoolean("error"); 

        if (!error) { 

         JSONArray contacts = jObj.getJSONArray("user"); 


         for (int i = 0; i < contacts.length(); i++) { 
          JSONObject c = contacts.getJSONObject(i); 

          String doctorTitle = c.getString("title"); 
          String doctorName = c.getString("first_name"); 
          String doctorSurname = c.getString("last_name"); 
          String doctorPhoto = c.getString("photo"); //image URL 
          String doctorMobile = c.getString("mobile"); 

          String doctorFullName = doctorTitle+" "+doctorName+" "+doctorSurname; 

          icon = new ImageDownloaderTask(holder.imageView).execute(doctorPhoto); 

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

          // adding each child node to HashMap key => value 
          contact.put("photo", icon); 
          contact.put("doctor", doctorFullName); 
          contact.put("mobile", doctorMobile); 

          // adding contact to contact list 
          contactList.add(contact); 
         } 

         ListAdapter adapter = new SimpleAdapter(
           DoctorsActivity.this, contactList, 
           R.layout.activity_doctors_list_item, new String[]{"photo", "doctor", 
           "mobile"}, new int[]{R.id.photo, 
           R.id.doctor, R.id.mobile}); 

         lv.setAdapter(adapter); 



        } else { 

         String errorMsg = jObj.getString("error_msg"); 
         Toast.makeText(getApplicationContext(), 
           errorMsg, Toast.LENGTH_LONG).show(); 
        } 
       } catch (JSONException e) { 
        e.printStackTrace(); 
       } 

      } 
     }, new Response.ErrorListener() { 

      @Override 
      public void onErrorResponse(VolleyError error) { 
       Toast.makeText(getApplicationContext(), 
         error.getMessage(), Toast.LENGTH_LONG).show(); 
      } 
     }) { 

      @Override 
      protected Map<String, String> getParams() { 
       // Posting params to login url 
       Map<String, String> params = new HashMap<String, String>(); 
       params.put("uid", pid); 
       params.put("lang", Locale.getDefault().getDisplayLanguage()); 
       return params; 
      } 
     }; 
     // Adding request to request queue 
     AppSingleton.getInstance(getApplicationContext()).addToRequestQueue(strReq,cancel_req_tag); 
    } 
    class ImageDownloaderTask extends AsyncTask<String, Void, Bitmap> { 

     private final WeakReference<ImageView> imageViewReference; 

     public ImageDownloaderTask(ImageView imageView) { 
      imageViewReference = new WeakReference<ImageView>(imageView); 
     } 

     @Override 
     protected Bitmap doInBackground(String... params) { 
      return downloadBitmap(params[0]); 
     } 

     @Override 
     protected void onPostExecute(Bitmap bitmap) { 
      if (isCancelled()) { 
       bitmap = null; 
      } 

      if (imageViewReference != null) { 
       ImageView imageView = imageViewReference.get(); 
       if (imageView != null) { 
        if (bitmap != null) { 
         imageView.setImageBitmap(bitmap); 
        } else { 
         Drawable placeholder = null; 
         imageView.setImageDrawable(placeholder); 
        } 
       } 
      } 
     } 

     private Bitmap downloadBitmap(String url) { 
      HttpURLConnection urlConnection = null; 
      try { 
       URL uri = new URL(url); 
       urlConnection = (HttpURLConnection) uri.openConnection(); 

       final int responseCode = urlConnection.getResponseCode(); 
       if (responseCode != HttpURLConnection.HTTP_OK) { 
        return null; 
       } 

       InputStream inputStream = urlConnection.getInputStream(); 
       if (inputStream != null) { 
        Bitmap bitmap = BitmapFactory.decodeStream(inputStream); 
        return bitmap; 
       } 
      } catch (Exception e) { 
       urlConnection.disconnect(); 
       Log.w("ImageDownloader", "Errore durante il download da " + url); 
      } finally { 
       if (urlConnection != null) { 
        urlConnection.disconnect(); 
       } 
      } 
      return null; 
     } 
    } 

} 

ответ

0

Для всех, кто хочет иметь ListView с изображениями это мой исправленный рабочий Выборочная адаптер:

public class DoctorAdapter extends ArrayAdapter<Doctors>{ 

    ArrayList<Doctors> doctorList; 
    LayoutInflater vi; 
    int Resource; 
    ViewHolder holder; 

    public DoctorAdapter(Context context, int resource, ArrayList<Doctors> objects) { 
     super(context, resource, objects); 
     vi = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     Resource = resource; 
     doctorList = objects; 
    } 

    @Override 
    public View getView(final int position, View convertView, ViewGroup parent) { 

     View v = convertView; 

     if (v == null) { 
      holder = new ViewHolder(); 
      v = vi.inflate(Resource, null); 

      holder.imageview = (ImageView) v.findViewById(R.id.photo); 
      holder.tvName = (TextView) v.findViewById(R.id.doctor); 
      holder.tvMobile = (TextView) v.findViewById(R.id.mobile); 

      holder.callButton = (Button) v.findViewById(R.id.btnCall); 
      holder.callButton.setTag(holder); 
      holder.callButton.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View view) { 
        ViewHolder viewHolder = (ViewHolder) view.getTag(); 
        String message= viewHolder.tvMobile.getText().toString(); 
        Toast.makeText(view.getContext(), message, Toast.LENGTH_SHORT).show(); 
       } 
      }); 

      v.setTag(holder); 
     } else { 
      holder = (ViewHolder) v.getTag(); 
     } 

     holder.imageview.setImageResource(R.drawable.noimage); 
     new DownloadImageTask(holder.imageview).execute(doctorList.get(position).getImage()); 
     holder.tvName.setText(doctorList.get(position).getName()); 
     holder.tvMobile.setText(doctorList.get(position).getMobile()); 
     return v; 
    } 

    static class ViewHolder { 
     public ImageView imageview; 
     public TextView tvName; 
     public TextView tvMobile; 
     public Button callButton; 
    } 

    private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> { 
     ImageView bmImage; 

     public DownloadImageTask(ImageView bmImage) { 
      this.bmImage = bmImage; 
     } 
     protected Bitmap doInBackground(String... urls) { 
      String urldisplay = urls[0]; 
      Bitmap mIcon = null; 
      try { 
       InputStream in = new java.net.URL(urldisplay).openStream(); 
       mIcon = BitmapFactory.decodeStream(in); 
      } catch (Exception e) { 
       Log.e("Error", e.getMessage()); 
       e.printStackTrace(); 
      } 
      return mIcon; 
     } 

     protected void onPostExecute(Bitmap result) { 
      bmImage.setImageBitmap(result); 
     } 
    } 
} 
0

Почему бы не использовать стороннюю библиотеку, например https://github.com/bumptech/glide?

Соответствующий код:

// ... 

new Glide 
    .with(convertView.getContext()) 
    .load(url) 
    .centerCrop() 
    .placeholder(R.drawable.noimage) 
    .crossFade() 
    .into(bmImage); 

holder.tvName.setText(doctorList.get(position).getName()); 
holder.tvMobile.setText(doctorList.get(position).getMobile()); 
// ...