Question

使用简单的适配器将图像放入列表视图时遇到了一些问题。我从我的在线服务器（AMAZON）获取图像。根据用户ID下载图像后，我尝试在列表视图中设置它们，但没有显示任何内容，也没有出现错误。

以下是我的代码：

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

                    // Storing each JSON item in variable
                    String uid = c.getString(TAG_UID);
                    String name = c.getString(TAG_NAME);
                    String overall = c.getString(TAG_OVERALL);
                    String apply_datetime = c.getString(TAG_APPLY_DATETIME);
                    String photo = c.getString(TAG_PHOTO);

                    // creating new HashMap
                    //HashMap<String, String> map = new HashMap<String, String>();

                    //IMAGE
                    HashMap<String, Object> map = new HashMap<String, Object>();

                    // adding each child node to HashMap key (value)
                    map.put(TAG_UID, uid);
                    map.put(TAG_NAME, name);
                    map.put(TAG_OVERALL, overall);
                    map.put(TAG_APPLY_DATETIME, apply_datetime);

                    // adding HashList to ArrayList
                    // applicantsList.add(map);

                    // LISTING IMAGE TO LISTVIEW
                    try {
                        imageURL = c.getString(TAG_PHOTO);

                        InputStream is = (InputStream) new URL(
                                "my url link/images/"
                                        + imageURL).getContent();
                        d = Drawable.createFromStream(is, "src name");
                    } catch (Exception e) {
                        e.printStackTrace();
                    }

                    map.put(TAG_PHOTO, d);

                    // adding HashList to ArrayList
                    applicantsList.add(map);
                }

正如您所看到的，在我下载图像之后。我使用下面的simpleAdapter设置为listview：

 SimpleAdapter adapter = new SimpleAdapter(
                            SignUpApplicantActivity.this, applicantsList,
                            R.layout.list_applicant, new String[] {
                                    TAG_UID, TAG_NAME, TAG_OVERALL,
                                    TAG_APPLY_DATETIME, TAG_PHOTO }, new int[] {
                                    R.id.applicantUid, R.id.applicantName,
                                    R.id.applicantOverall,
                                    R.id.apply_datetime, R.id.list_image });
                    // updating listView
                    setListAdapter(adapter);

Answer 1

您是否调用了notifyDatasetChange（）？如果你没有调用它，你的适配器可能不会失效。

Answer 2

从SimpleAdapter documentation预计图像数据将是资源ID或字符串（图像URI） - 请参阅setViewImage(ImageView,String)

我看到了两个解决方案：

在数据地图中提供URI，而不是drawable。

实现您自己的视图绑定器以将drawable绑定到ImageView：

adapter.setViewBinder(new SimpleAdapter.ViewBinder() {

    @Override
    public boolean setViewValue(View view, Object data, String textRepresentation) {
        if(view.getId() == R.id.list_image) {
            ImageView imageView = (ImageView) view;
            Drawable drawable = (Drawable) data;
            imageView.setImageDrawable(drawable);
            return true;
        }
        return false;
    }
});

Answer 3

尝试

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

                // Storing each JSON item in variable
                String uid = c.getString(TAG_UID);
                String name = c.getString(TAG_NAME);
                String overall = c.getString(TAG_OVERALL);
                String apply_datetime = c.getString(TAG_APPLY_DATETIME);
                String photo = c.getString(TAG_PHOTO);

                // creating new HashMap
                HashMap<String, String> map = new HashMap<String, String>();

                // adding each child node to HashMap key (value)
                map.put(TAG_UID, uid);
                map.put(TAG_NAME, name);
                map.put(TAG_OVERALL, overall);
                map.put(TAG_APPLY_DATETIME, apply_datetime);
                map.put(TAG_PHOTO, photo);

                // adding HashList to ArrayList
                applicantsList.add(map);
           } catch (Exception e) {
                    e.printStackTrace();
                }
          return null;
      }
           SimpleAdapter adapter = new SimpleAdapter(
                        SignUpApplicantActivity.this, applicantsList,
                        R.layout.list_applicant, new String[] {
                                TAG_UID, TAG_NAME, TAG_OVERALL,
                                TAG_APPLY_DATETIME, TAG_PHOTO }, new int[] {
                                R.id.applicantUid, R.id.applicantName,
                                R.id.applicantOverall,
                                R.id.apply_datetime, R.id.list_image });
                // updating listView
                setListAdapter(adapter);

也许我的代码可以帮助你！？！我做了

convertDrawable（int Integer）

和String.valueOf（convertDrawable（iconId））

HashF.put(TAG_ID, String.valueOf(convertDrawable(iconId)));

private void getList(JSONObject json) {
        try {
            details = json.getJSONArray(TAG_LIST);

            for (int i = 0; i < details.length(); i++) {

                JSONObject main = details.getJSONObject(i);
                Integer date = main.getInt(TAG_DATE);
                JSONArray nArray = main.getJSONArray(TAG_NOW);

                JSONObject detail = nArray.getJSONObject(0);
                Integer iconId = detail.getInt(TAG_ID);

                HashMap<String, String> HashF = new HashMap<String, String>();

                HashF.put(TAG_DATE, convertDate(date));
                HashF.put(TAG_ID, String.valueOf(convertDrawable(iconId)));

                fList.add(HashF);
            }
        } catch (Exception e) {

        }
        ListAdapter adapter = 
                new SimpleAdapter(getActivity(), 
                        fList, R.layout.list_item,
                new String[]{
                        TAG_DATE,
                        TAG_ID
                },
                new int[]{
                        R.id.datum,
                        R.id.icon_fore
                });

        setListAdapter(adapter);
    }

    public static String convertDate(Integer Time) {
        SimpleDateFormat sdf = 
                new SimpleDateFormat(
                        "dd, MMMM", Locale.getDefault());

        Calendar kal = 
                Calendar.getInstance();

        kal.setTimeInMillis(Time * 1000L);
        sdf.setTimeZone(kal.getTimeZone());
        return sdf.format(kal.getTime());

    }


    public static int convertDrawable(int aId){
        int icon = 0;

        if(aId == 8300){
            icon = R.drawable.draw1;
        }
        if (aId >= 7010 && actualId < 7919){
            icon = R.drawable.draw2;
        }
        if (aId >= 2010 && actualId <3010) {
            icon = R.drawable.draw3;
        }
        if (aId >= 3010 && actualId < 4010) {
            icon = R.drawable.draw4;
        }
        if (aId >= 6010 && actualId < 7010) {
            icon = R.drawable.draw5;
        }
        if (aId >= 5010 && actualId < 6010) {
            icon = R.drawable.draw6;
        }
        if (aId == 3801){
            icon = R.drawable.draw7;
        }
        if (aId == 8032){
            icon = R.drawable.draw8;
        }
        if (aId == 8083){
            icon = R.drawable.draw9;
        }
        if (aId == 8704) {
            icon = R.drawable.draw10;
        }

        return icon;
    }

无论如何看看Bitmap is not a Drawable

将simpleAdapter与imageview一起使用

3 个答案: