使用 JSON 从 URL 添加图像

Posted 2023-04-19

【中文标题】使用 JSON 从 URL 添加图像

【英文标题】：Add Images from a URL using JSON

【发布时间】：2020-09-29 14:30:54

【问题描述】：

我是 JSON 新手。我会感谢你帮助我。如何通过 Json 在图像中添加解析。有人可以告诉我我在这里想念什么吗？我希望每个新闻链接的图像都显示在我的ImageView（xml 中的占位符）上，这里是链接和 api。 https://newsapi.org/v2/top-headlines?country=us&apiKey=6a6f7c77766442acb20c86157a152131"

非常感谢您的帮助

---

这是我在 Query.Java 中的代码

try 
    JSONObject baseJsonResponse = new JSONObject(bookJson);
    JSONArray newsArray = baseJsonResponse.getJSONArray("articles");

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

        JSONObject currentNews = newsArray.getJSONObject(i);
        /*JSONObject properties = currentNews.getJSONObject("articles");*/
        JSONObject newsSource = currentNews.getJSONObject("source");

        String title = currentNews.getString("title");
        String description = currentNews.getString("description");
        String url = currentNews.getString("url");
        /*String name = properties.getString("name");*/
        String name = newsSource.getString("name");
        String time = currentNews.getString("publishedAt");

        String image = currentNews.getString("urlToImage");



        News news = new News (title, description, url, name, time, image);

这是自定义类中的代码

package com.example.trynews;

public class News 

    private String mTitle;
    private String mDescription;
    private String mUrl;
    private String mSource;
    private String mTime;
    private String mUrlImage;




    public News (String title, String description, String url, String name, String time, String images) 
        mTitle = title;
        mDescription = description;
        mUrl = url;
        mSource = name;
        mTime = time;
        mUrlImage = images;
 

    public String getTitle() 
        return mTitle;
    

    public String getDescription() 
        return mDescription;
    

    public String getURL() 
        return mUrl;
    


    public String getName() 
        return mSource;
    
    public String getTIME() 
        return mTime;
    

    public String getImageUrl() 
        return mUrlImage;
    

这是适配器（列表视图）中的代码

public class NewsAdapter extends ArrayAdapter<News> 
    public NewsAdapter(Context context, List<News> newss) 
        super(context, 0, newss);
    

    @Override
    public View getView(int position,  View convertView, ViewGroup parent) 
        View listItemView = convertView;
        if (listItemView == null) 
            listItemView = LayoutInflater.from(getContext()).inflate(
                    R.layout.news_list_item, parent, false);
        

        News currentNews = getItem(position);


        TextView titleView = (TextView) listItemView.findViewById(R.id.title);
        titleView.setText(currentNews.getTitle());


        TextView descripView = (TextView) listItemView.findViewById(R.id.description);
        descripView.setText(currentNews.getDescription());




        TextView sourceView = (TextView) listItemView.findViewById(R.id.newsSource);
        sourceView.setText(currentNews.getName());


        TextView timeView = (TextView) listItemView.findViewById(R.id.date);
        timeView.setText(currentNews.getTIME());



        ImageView imageView = (ImageView) listItemView.findViewById(R.id.imageView);
        imageView.setImagerResource(currentNews.getImageUrl());

        I am getting an error here it says I cant add a String inside setImageResource. 



        return listItemView;
    

【问题讨论】：

显示您的 api 响应。 json

【参考方案1】：

如果你想从 url 显示图片，简单的方法是使用图片库。

例如Glide

添加 build.gradle

repositories 
  mavenCentral()
  google()


dependencies 
  implementation 'com.github.bumptech.glide:glide:4.9.0'
  annotationProcessor 'com.github.bumptech.glide:compiler:4.9.0'

在你的适配器中，

imageView.setImagerResource(currentNews.getImageUrl());

改成

Glide.with(getContext).load(currentNews.getImageUrl()).into(imageView);

或者使用位图

Bitmap bitmap; // this is global 




Thread mthread = new Thread() 
    @Override
    public void run() 
        try 
            URL url = new URL(currentNews.getImageUrl());

            HttpURLConnection conn = (HttpURLConnection)url.openConnection();
            conn.setDoInput(true);
            conn.connect();

            InputStream is = conn.getInputStream();
            bitmap = BitmapFactory.decodeStream(is);
         catch (MalformedURLException e) 
            e.printStackTrace();
         catch (IOException e) 
            e.printStackTrace();
        
    
;

mthread.start();

try 
    mthread.join();
    imageView.setImageBitmap(bitmap);


 catch (InterruptedException e) 
    e.printStackTrace();

【讨论】：

它就像一个魅力非常感谢你帮助我

【参考方案2】：

   ImageView imageView = (ImageView) listItemView.findViewById(R.id.imageView);
   URL url = new URL(currentNews.getImageUrl());
   Bitmap bitmap = 
   BitmapFactory.decodeStream(url.openConnection().getInputStream());
   imageView.setImageBitmap(bitmap);

试试上面的代码

【参考方案3】：

使用 picasso 库从 URL 加载图像：如果您愿意，请点击以下链接：https://medium.com/@prakash_pun/retrofit-a-simple-android-tutorial-48437e4e5a23