未将图像从 json 文件加载到我的列表视图
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【中文标题】未将图像从 json 文件加载到我的列表视图【英文标题】：Not loading image from json file to my listview 【发布时间】：2016-01-11 05:37:26 【问题描述】：我是 android 编程的新手，我正在尝试从 json 文件加载图像和文本，我的文本视图正在加载，但我的图像没有加载，请帮助我。
自定义列表视图适配器
import java.util.List;
import com.squareup.picasso.Picasso;
import com.suni.sun.HomeGv;
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class CustomListViewAdapter extends ArrayAdapter<HomeGv>
private Activity activity;
public CustomListViewAdapter(Activity activity, int resource,
List<HomeGv> img)
super(activity, resource, img);
this.activity = activity;
// TODO Auto-generated constructor stub
@Override
public View getView(int position, View convertView, ViewGroup parent)
// TODO Auto-generated method stub
ViewHolder holder = null;
LayoutInflater inflater = (LayoutInflater) activity.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
if (convertView == null)
convertView = inflater.inflate(R.layout.home_item, parent, false);
holder = new ViewHolder(convertView);
convertView.setTag(holder);
else
holder = (ViewHolder) convertView.getTag();
HomeGv thing = (HomeGv) getItem(position);
holder.title.setText(thing.getTitle());
holder.date_taken.setText(thing.getDate());
Picasso.with(activity).load(thing.getMedia()).into(holder.image);
return convertView;
private static class ViewHolder
private TextView title,date_taken;
private ImageView image;
public ViewHolder(View v)
title = (TextView) v.findViewById(R.id.grid_item_title);
date_taken = (TextView) v.findViewById(R.id.grid_item_date);
image = (ImageView) v.findViewById(R.id.grid_item_image);
ListViewActivity 类
import java.util.ArrayList;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import com.suni.sun.JsonParse;
import com.suni.sun.HomeGv;
public class ListViewActivity extends Activity
private ListView lv;
private ArrayList<HomeGv> img;
private ArrayAdapter<HomeGv> adap;
private final static String TAG = ListViewActivity.class.getSimpleName();
private final static String url = "http://saicloudica.cloudapp.net/json.txt";
@Override
protected void onCreate(Bundle savedInstanceState)
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.home);
lv = (ListView) findViewById(R.id.listView);
setListViewAdapter();
getDataFromInternet();
private void getDataFromInternet()
new JsonParse(this, url).execute();
private void setListViewAdapter()
img = new ArrayList<HomeGv>();
adap = new CustomListViewAdapter(this, R.layout.home_item, img);
lv.setAdapter(adap);
public void parseJsonResponse(String result)
Log.i(TAG, result);
try
JSONObject json = new JSONObject(result);
JSONArray jArray = new JSONArray(json.getString("items"));
for (int i = 0; i < jArray.length(); i++)
JSONObject jObj = jArray.getJSONObject(i);
HomeGv imgs = new HomeGv();
imgs.setTitle(jObj.getString("title"));
imgs.setDate(jObj.getString("date_taken"));
if(json.has("media"))
JSONObject media = jObj.getJSONObject("media");
String medi = media.getString("m");
if(medi != null)
imgs.setMedia(media.getString("m"));
img.add(imgs);
adap.notifyDataSetChanged();
catch (JSONException e)
e.printStackTrace();
@Override
public void onBackPressed()
// TODO Auto-generated method stub
finish();
家庭课堂
public class HomeGv
private String title;
private String media;
private String date_taken;
public String getTitle()
return title;
public void setTitle(String title)
this.title = title;
public String getMedia()
return media;
public void setMedia(String media)
this.media = media;
public String getDate()
return date_taken;
public void setDate(String date_taken)
this.date_taken = date_taken;
日志：
10-13 12:39:33.835: I/ListViewActivity(5501): "generator":"http:\/\/www.flickr.com\/","title":"Recent Uploads tagged soccer","items":["tags":"iris copyright sports soccer be quick epping voetbal 2015 1887 sportclub silvolde hoofdklasse","author":"nobody@flickr.com (SportclubSilvolde)","title":"IMG_9207","description":" <p><a href=\"http:\/\/www.flickr.com\/people\/sportclubsilvolde\/\">SportclubSilvolde<\/a> posted a photo:<\/p> <p><a href=\"http:\/\/www.flickr.com\/photos\/sportclubsilvolde\/21782884471\/\" title=\"IMG_9207\"><img src=\"http:\/\/farm1.staticflickr.com\/681\/21782884471_6834f2c9d8_m.jpg\" width=\"240\" height=\"160\" alt=\"IMG_9207\" \/><\/a><\/p> ","date_taken":"2015-09-27T15:00:50-08:00","link":"http:\/\/www.flickr.com\/photos\/sportclubsilvolde\/21782884471\/","author_id":"124810748@N04","published":"2015-09-28T02:59:30Z","media":"m":"http:\/\/farm1.staticflickr.com\/681\/21782884471_6834f2c9d8_m.jpg","tags":"iris copyright sports soccer be quick epping voetbal 2015 1887 sportclub silvolde hoofdklasse","author":"nobody@flickr.com (SportclubSilvolde)","title":"IMG_9484","description":" <p><a href=\"http:\/\/www.flickr.com\/people\/sportclubsilvolde\/\">SportclubSilvolde<\/a> posted a photo:<\/p> <p><a href=\"http:\/\/www.flickr.com\/photos\/sportclubsilvolde\/21747301246\/\" title=\"IMG_9484\"><img src=\"http:\/\/farm1.staticflickr.com\/736\/21747301246_f03bc953d6_m.jpg\" width=\"240\" height=\"160\" alt=\"IMG_9484\" \/><\/a><\/p> ","date_taken":"2015-09-27T15:58:43-08:00","link":"http:\/\/www.flickr.com\/photos\/sportclubsilvolde\/21747301246\/","author_id":"124810748@N04","published":"2015-09-28T02:59:38Z","media":"m":"http:\/\/farm1.staticflickr.com\/736\/21747301246_f03bc953d6_m.jpg","tags":"iris copyright sports soccer be quick epping voetbal 2015 1887 sportclub silvolde hoofdklasse","author":"nobody@flickr.com (SportclubSilvolde)","title":"IMG_9135","description":" <p><a href=\"http:\/\/www.flickr.com\/people\/sportclubsilvolde\/\">SportclubSilvolde<\/a> posted a photo:<\/p> <p><a href=\"http:\/\/www.flickr.com\/photos\/sportclubsilvolde\/21585600568\/\" title=\"IMG_9135\"><img src=\"http:\/\/farm1.staticflickr.com\/588\/21585600568_bce2bcd47a_m.jpg\" width=\"240\" height=\"160\" alt=\"IMG_9135\" \/><\/a><\/p> ","date_taken":"2015-09-27T14:53:53-08:00","link":"http:\/\/www.flickr.com\/photos\/sportclubsilvolde\/21585600568\/","author_id":"124810748@N04","published":"2015-09-28T02:59:28Z","media":"m":"http:\/\/farm1.staticflickr.com\/588\/21585600568_bce2bcd47a_m.jpg","tags":"iris copyright sports soccer be quick epping voetbal 2015 1887 sportclub silvolde hoofdklasse","author":"nobody@flickr.com (SportclubSilvolde)","title":"IMG_9062","description":" <p><a href=\"http:\/\/www.flickr.com\/people\/sportclubsilvolde\/\">SportclubSilvolde<\/a> posted a photo:<\/p> <p><a href=\"http:\/\/www.flickr.com\/photos\/sportclubsilvolde\/21761757502\/\" title=\"IMG_9062\"><img src=\"http:\/\/farm6.staticflickr.com\/5648\/21761757502_e18ee1b76f_m.jpg\" width=\"240\" height=\"160\" alt=\"IMG_9062\" \/><\/a><\/p> ","date_taken":"2015-09-27T14:48:06-08:00","link":"http:\/\/www.flickr.com\/photos\/sportclubsilvolde\/21761757502\/","author_id":"124810748@N04","published":"2015-09-28T02:59:27Z","media":"m":"http:\/\/farm6.staticflickr.com\/5648\/21761757502_e18ee1b76f_m.jpg","tags":"iris copyright sports soccer be quick epping voetbal 2015 1887 sportclub silvolde hoofdklasse","author":"nobody@flickr.com (SportclubSilvolde)","title":"IMG_9718","description":" <p><a href=\"http:\/\/www.flickr.com\/people\/sportclubsilvolde\/\">SportclubSilvolde<\/a> posted a photo:<\/p> <p><a href=\"http:\/\/www.flickr.com\/photos\/sportclubsilvolde\/21773428785\/\" title=\"IMG_9718\"><img src=\"http:\/\/farm6.staticflickr.com\/5798\/21773428785_256689c88f_m.jpg\" width=\"240\" height=\"160\" alt=\"IMG_9718\" \/><\/a><\/p> ","date_taken":"2015-09-27T16:27:04-08:00","link":"http:\/\/www.flickr.com\/photos\/sportclubsilvolde\/21773428785\/","author_id":"124810748@N04","published":"2015-09-28T02:59:43Z","media":"m":"http:\/\/f
10-13 12:39:34.425: I/JsonParse(5501): "generator":"http:\/\/www.flickr.com\/","title":"Recent Uploads tagged soccer","items":["tags":"iris copyright sports soccer be quick epping voetbal 2015 1887 sportclub silvolde hoofdklasse","author":"nobody@flickr.com (SportclubSilvolde)","title":"IMG_9207","description":" <p><a href=\"http:\/\/www.flickr.com\/people\/sportclubsilvolde\/\">SportclubSilvolde<\/a> posted a photo:<\/p> <p><a href=\"http:\/\/www.flickr.com\/photos\/sportclubsilvolde\/21782884471\/\" title=\"IMG_9207\"><img src=\"http:\/\/farm1.staticflickr.com\/681\/21782884471_6834f2c9d8_m.jpg\" width=\"240\" height=\"160\" alt=\"IMG_9207\" \/><\/a><\/p> ","date_taken":"2015-09-27T15:00:50-08:00","link":"http:\/\/www.flickr.com\/photos\/sportclubsilvolde\/21782884471\/","author_id":"124810748@N04","published":"2015-09-28T02:59:30Z","media":"m":"http:\/\/farm1.staticflickr.com\/681\/21782884471_6834f2c9d8_m.jpg","tags":"iris copyright sports soccer be quick epping voetbal 2015 1887 sportclub silvolde hoofdklasse","author":"nobody@flickr.com (SportclubSilvolde)","title":"IMG_9484","description":" <p><a href=\"http:\/\/www.flickr.com\/people\/sportclubsilvolde\/\">SportclubSilvolde<\/a> posted a photo:<\/p> <p><a href=\"http:\/\/www.flickr.com\/photos\/sportclubsilvolde\/21747301246\/\" title=\"IMG_9484\"><img src=\"http:\/\/farm1.staticflickr.com\/736\/21747301246_f03bc953d6_m.jpg\" width=\"240\" height=\"160\" alt=\"IMG_9484\" \/><\/a><\/p> ","date_taken":"2015-09-27T15:58:43-08:00","link":"http:\/\/www.flickr.com\/photos\/sportclubsilvolde\/21747301246\/","author_id":"124810748@N04","published":"2015-09-28T02:59:38Z","media":"m":"http:\/\/farm1.staticflickr.com\/736\/21747301246_f03bc953d6_m.jpg","tags":"iris copyright sports soccer be quick epping voetbal 2015 1887 sportclub silvolde hoofdklasse","author":"nobody@flickr.com (SportclubSilvolde)","title":"IMG_9135","description":" <p><a href=\"http:\/\/www.flickr.com\/people\/sportclubsilvolde\/\">SportclubSilvolde<\/a> posted a photo:<\/p> <p><a href=\"http:\/\/www.flickr.com\/photos\/sportclubsilvolde\/21585600568\/\" title=\"IMG_9135\"><img src=\"http:\/\/farm1.staticflickr.com\/588\/21585600568_bce2bcd47a_m.jpg\" width=\"240\" height=\"160\" alt=\"IMG_9135\" \/><\/a><\/p> ","date_taken":"2015-09-27T14:53:53-08:00","link":"http:\/\/www.flickr.com\/photos\/sportclubsilvolde\/21585600568\/","author_id":"124810748@N04","published":"2015-09-28T02:59:28Z","media":"m":"http:\/\/farm1.staticflickr.com\/588\/21585600568_bce2bcd47a_m.jpg","tags":"iris copyright sports soccer be quick epping voetbal 2015 1887 sportclub silvolde hoofdklasse","author":"nobody@flickr.com (SportclubSilvolde)","title":"IMG_9062","description":" <p><a href=\"http:\/\/www.flickr.com\/people\/sportclubsilvolde\/\">SportclubSilvolde<\/a> posted a photo:<\/p> <p><a href=\"http:\/\/www.flickr.com\/photos\/sportclubsilvolde\/21761757502\/\" title=\"IMG_9062\"><img src=\"http:\/\/farm6.staticflickr.com\/5648\/21761757502_e18ee1b76f_m.jpg\" width=\"240\" height=\"160\" alt=\"IMG_9062\" \/><\/a><\/p> ","date_taken":"2015-09-27T14:48:06-08:00","link":"http:\/\/www.flickr.com\/photos\/sportclubsilvolde\/21761757502\/","author_id":"124810748@N04","published":"2015-09-28T02:59:27Z","media":"m":"http:\/\/farm6.staticflickr.com\/5648\/21761757502_e18ee1b76f_m.jpg","tags":"iris copyright sports soccer be quick epping voetbal 2015 1887 sportclub silvolde hoofdklasse","author":"nobody@flickr.com (SportclubSilvolde)","title":"IMG_9718","description":" <p><a href=\"http:\/\/www.flickr.com\/people\/sportclubsilvolde\/\">SportclubSilvolde<\/a> posted a photo:<\/p> <p><a href=\"http:\/\/www.flickr.com\/photos\/sportclubsilvolde\/21773428785\/\" title=\"IMG_9718\"><img src=\"http:\/\/farm6.staticflickr.com\/5798\/21773428785_256689c88f_m.jpg\" width=\"240\" height=\"160\" alt=\"IMG_9718\" \/><\/a><\/p> ","date_taken":"2015-09-27T16:27:04-08:00","link":"http:\/\/www.flickr.com\/photos\/sportclubsilvolde\/21773428785\/","author_id":"124810748@N04","published":"2015-09-28T02:59:43Z","media":"m":"http:\/\/farm6.st
10-13 12:39:34.425: I/Choreographer(5501): Skipped 77 frames! The application may be doing too much work on its main thread.
10-13 12:39:34.495: W/Settings(5501): Setting airplane_mode_on has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
【问题讨论】：
您需要使用库在列表中显示图像。像 picasso 或 volley 或通用图像加载器这样的著名库 @Moudiz 请正确查看代码，他已经在使用 Picasso @Heamanth 请在JSONLint上发布您的完整日志并检查您的 JSON 语法 @vipul 在 logcat 中的行仅在加载 json 数据时出现。 去掉这个条件if(json.has("media")) 看看是否有效
【参考方案1】：
您可以使用也用于图像加载的 Aquery，下载查询 jar 并将其导入您的项目并尝试以下代码
public class CustomAdapterAccept extends BaseAdapter
private Context context;
private ArrayList<HashMap<String,String>> listData;
private AQuery aQuery;
private static final String TAG_NAME="name";
private static final String TAG_PROFILE="profile_id";
private static final String TAG_IMAGE="image";
private static final String TAG_CAST="cast";
private static final String TAG_AGE="age";
private static final String TAG_LOCATION="location";
public CustomAdapterAccept(Context context,ArrayList<HashMap<String,String>> listData)
this.context = context;
this.listData=listData;
aQuery = new AQuery(this.context);
@Override
public int getCount()
return listData.size();
@Override
public Object getItem(int position)
return listData.get(position);
@Override
public long getItemId(int position)
return position;
@Override
public View getView(final int position, View convertView, ViewGroup parent)
ViewHolder holder;
if (convertView == null)
holder = new ViewHolder();
convertView = LayoutInflater.from(context).inflate(R.layout.list_item_acceptedlist, null);
holder.propic = (ImageView) convertView.findViewById(R.id.propicaccept);
holder.txtproname = (TextView) convertView.findViewById(R.id.txtpronameacptedlist);
holder.txtproid = (TextView) convertView.findViewById(R.id.txtproidacptedlist);
holder.txtprofilecast = (TextView) convertView.findViewById(R.id.txtprofilecastacptedlist);
holder.txtprofileage = (TextView) convertView.findViewById(R.id.txtprofileageacptedlist);
holder.txtprofileplace = (TextView) convertView.findViewById(R.id.txtprofileplaceacptedlist);
convertView.setTag(holder);
else
holder = (ViewHolder) convertView.getTag();
holder.txtproname.setText(listData.get(position).get(TAG_NAME));
holder.txtproid.setText(listData.get(position).get(TAG_PROFILE));
holder.txtprofilecast.setText(listData.get(position).get(TAG_CAST));
holder.txtprofileage.setText(listData.get(position).get(TAG_AGE));
holder.txtprofileplace.setText(listData.get(position).get(TAG_LOCATION));
aQuery.id(holder.propic).image(listData.get(position).get(TAG_IMAGE),true,true,0,R.drawable.ic_launcher);
// image parameter : 1 : memory cache,2:file cache,3:target width,4:fallback image
return convertView;
class ViewHolder
ImageView propic;
TextView txtproname;
TextView txtproid;
TextView txtprofilecast;
TextView txtprofileage;
TextView txtprofileplace;
【讨论】：
毕加索不可能吗 @HeamanthVarma picasso 比 Aquery 更高效，而 Aquery 已被弃用【参考方案2】：只需从代码中删除此条件if(json.has("media")) 即可。
当您检查 media 作为主 JSON 中的标签时，它不包含一个标签。
【讨论】：
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