アダプタがAndroidのJSONから画像をロードできない

Question

私のJSONコードに問題があります。 テキストと画像を含むリストを表示したい。テキストと画像は私のオンラインデータベースに保存されています。私はJSONを使ってアンドロイドアプリに持っていきます。

JSONはエラーを表示せず、テキストは表示されますが、イメージは表示されません。

私はlogcatをチェックしていますが、このプロセスでエラーはありません。私は、リストに画像を表示するためにviewAdapterを使用しています。

お手伝いをしてください、簡単な説明を教えてくださいこれを解決するにはどうすればいいですか？

ありがとう...

NB。これは私のHomeFragment.javaのコードです（JSONを実行しています）。

public class HomeFragment extends Fragment implements InternetConnectionListener, ApiHandler.ApiHandlerListener { 

private static final String ARG_SECTION_NUMBER = "section_number"; 
private final int CATEGORY_ACTION = 1; 
private CategorySelectionCallbacks mCallbacks; 
private ArrayList<Category> categoryList; 
private ListView categoryListView; 
private String Error = null; 
private InternetConnectionListener internetConnectionListener; 

public HomeFragment() { 

} 

public static HomeFragment newInstance(int sectionNumber) { 
    HomeFragment fragment = new HomeFragment(); 
    Bundle args = new Bundle(); 
    args.putInt(ARG_SECTION_NUMBER, sectionNumber); 
    fragment.setArguments(args); 
    return fragment; 
} 

@Override 
public void onAttach(Activity activity) { 
    super.onAttach(activity); 
    ((HomeActivity) activity).onSectionAttached(getArguments().getInt(ARG_SECTION_NUMBER)); 
    try { 
     mCallbacks = (CategorySelectionCallbacks) activity; 
    } catch (ClassCastException e) { 
     throw new ClassCastException("Activity must implement CategorySelectionCallbacks."); 
    } 
} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    View rootView = inflater.inflate(R.layout.fragment_home, container, false); 
    categoryListView = (ListView) rootView.findViewById(R.id.categoryListView); 
    return rootView; 
} 

@Override 
public void onResume() { 
    super.onResume(); 
    if (UtilMethods.isConnectedToInternet(getActivity())) { 
     initCategoryList(); 
    } else { 
     internetConnectionListener = (InternetConnectionListener) HomeFragment.this; 
     showNoInternetDialog(getActivity(), internetConnectionListener, 
       getResources().getString(R.string.no_internet), 
       getResources().getString(R.string.no_internet_text), 
       getResources().getString(R.string.retry_string), 
       getResources().getString(R.string.exit_string), CATEGORY_ACTION); 
    } 

} 

public class getCategList extends AsyncTask<Void, Void, Void>{ 

    @Override 
    protected Void doInBackground(Void... params) { 

     /** 
     * json is populating from text file. To make api call use ApiHandler class 
     * 
     * <CODE>ApiHandler apiHandler = new ApiHandler(this, URL_GET_CATEGORY);</CODE> <BR> 
     * <CODE>apiHandler.doApiRequest(ApiHandler.REQUEST_GET);</CODE> <BR> 
     * 
     * You will get the response in onSuccessResponse(String tag, String jsonString) method 
     * if successful api call has done. Do the parsing as the following. 
     */ 
     URL hp = null; 
     try { 
      hp = new URL(
        getString(R.string.liveurl) + "foodcategory.php"); 

      Log.d("URL", "" + hp); 
      URLConnection hpCon = hp.openConnection(); 
      hpCon.connect(); 
      InputStream input = hpCon.getInputStream(); 

      BufferedReader r = new BufferedReader(new InputStreamReader(input)); 

      String x = ""; 
      x = r.readLine(); 
      String total = ""; 

      while (x != null) { 
       total += x; 
       x = r.readLine(); 
      } 
      Log.d("UR1L", "" + total); 

      JSONArray j = new JSONArray(total); 

      Log.d("URL1", "" + j.length()); 



      categoryList = new ArrayList<Category>(); 

      for (int i = 0; i < j.length(); i++) { 
       Category category = new Category();// buat variabel category 
       JSONObject Obj; 
       Obj = j.getJSONObject(i); //sama sperti yang lama, cman ini lebih mempersingkat karena getJSONObject cm d tulis sekali aja disini 

       category.setId(Obj.getString(JF_ID)); 
       category.setTitle(Obj.getString(JF_TITLE)); 
       category.setIconUrl(Obj.getString(JF_ICON)); 

       if (!TextUtils.isEmpty(Obj.getString(JF_BACKGROUND_IMAGE))) { 
        category.setImageUrl(Obj.getString(JF_BACKGROUND_IMAGE)); 
       } 
       Log.d("URL1",""+Obj.getString(JF_TITLE)); 
       categoryList.add(category); 
      } 

      getActivity().runOnUiThread(new Runnable() { 
       @Override 
       public void run() { 
        categoryListView.setAdapter(new CategoryAdapter(getActivity(), mCallbacks, categoryList)); 
       } 
      }); 



     }catch (MalformedURLException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
      Error = e.getMessage(); 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
      Error = e.getMessage(); 
     } catch (JSONException e) { 
      // TODO Auto-generated catch block 
      Error = e.getMessage(); 
      e.printStackTrace(); 
     } catch (NullPointerException e) { 
      // TODO: handle exception 
      Error = e.getMessage(); 
     } 
     return null; 
    } 
} 



//! function for populate category list 
private void initCategoryList() { 
     new getCategList().execute(); 
} 

@Override 
public void onConnectionEstablished(int code) { 
    if (code == CATEGORY_ACTION) { 
     initCategoryList(); 
    } 
} 

@Override 
public void onUserCanceled(int code) { 
    if (code == CATEGORY_ACTION) { 
     getActivity().finish(); 
    } 
} 

//! catch json response from here 
@Override 
public void onSuccessResponse(String tag, String jsonString) { 
    //! do same parsing as done in initCategoryList() 
} 

//! detect response error here 
@Override 
public void onFailureResponse(String tag) { 

} 

//! callback interface listen by HomeActivity to detect user click on category 
public static interface CategorySelectionCallbacks { 
    void onCategorySelected(String catID, String title); 
} 

}

categoryAdapter.javaためのこのコード（ここで、iは、リストにJSONの結果を置く）

public class CategoryAdapter extends ArrayAdapter<Category> implements View.OnClickListener { 

private final LayoutInflater inflater; 
private final ArrayList<Category> categoryList; 
private Activity activity; 
private HomeFragment.CategorySelectionCallbacks mCallbacks; 
private String dummyUrl = "http://www.howiwork.org"; 
AbsListView.LayoutParams params; 


public CategoryAdapter(Activity activity, HomeFragment.CategorySelectionCallbacks mCallbacks, ArrayList<Category> categoryList) { 
    super(activity, R.layout.layout_category_list); 
    this.activity = activity; 
    this.inflater = LayoutInflater.from(activity.getApplicationContext()); 
    this.categoryList = categoryList; 
    this.mCallbacks = mCallbacks; 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    ViewHolder row; 
    if (convertView == null) { 
     convertView = inflater.inflate(R.layout.layout_category_list, null); 
     row = new ViewHolder(); 
     row.bannerImage = (ImageView) convertView.findViewById(R.id.catBannerImageView); 
     row.categoryImage = (ImageView) convertView.findViewById(R.id.catImageView); 
     row.categoryName = (TextView) convertView.findViewById(R.id.catNameTV); 








    } else { 
     row = (ViewHolder) convertView.getTag(); 

    } 

    Category category = categoryList.get(position); 
    Picasso.with(activity).load(UtilMethods 
      .getDrawableFromFileName(activity,category.getIconUrl())) 
      .tag(category.getIconUrl()) 
      .into(row.categoryImage); 
    row.categoryName.setText(category.getTitle()); 

    Picasso.with(activity) 
      .load(UtilMethods.getDrawableFromFileName(activity,category.getImageUrl())) 
      .placeholder(R.drawable.img_banner_placeholder) 
      .tag(category.getIconUrl()) 
      .fit() 
      .into(row.bannerImage); 


    row.bannerImage.setOnClickListener(this); 
    row.categoryImage.setTag(position); 
    row.categoryName.setTag(position); 
    row.bannerImage.setTag(position); 
    return convertView; 
} 

@Override 
public int getCount() { 
    return categoryList.size(); 
} 

@Override 
public void onClick(View v) { 
    int position = Integer.parseInt(v.getTag().toString()); 
    mCallbacks.onCategorySelected(categoryList.get(position).getId(), 
      categoryList.get(position).getTitle()); 
} 

private static class ViewHolder { 
    public ImageView bannerImage; 
    public TextView categoryName; 
    public ImageView categoryImage; 
} 

}

Answer 1

これを試してみてください。

Picasso.with(activity).load(category.getIconUrl()) 
     .into(row.categoryImage); 

もし成功したら！ UtilMethods.getDrawableFromFileName（）をチェックしてください！