未将图像从 json 文件加载到我的列表视图

【问题标题】：Not loading image from json file to my listview未将图像从 json 文件加载到我的列表视图
【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

标签： android json android-listview


【解决方案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
【解决方案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】：

    猜你喜欢
    • 1970-01-01
    • 2016-02-10
    • 1970-01-01
    • 2023-03-28
    • 2011-04-07
    • 1970-01-01
    • 1970-01-01
    • 2014-09-19
    • 2014-09-06
    相关资源
    最近更新 更多
    热门标签
    Java Python linux javascript Mysql C# Docker 算法 前端 SpringBoot Redis Vue spring 设计模式 .net core .net kubernetes c++ 数据库 数据结构 大数据 js 机器学习 微服务 Android Go 程序员 面试 JVM ASP.net core 云原生 人工智能 后端 PHP git CSS golang k8s Nginx Django mybatis 深度学习 多线程 React 架构 devops 爬虫 云计算 Spring Boot LeetCode