如何使用volley从listview中的json获取图片

dependencies {
    implementation 'com.android.volley:volley:1.2.0'
}

public class CustomAdapter extends BaseAdapter {
    private Context context;
    private List<Item> itemList;

    public CustomAdapter(Context context, List<Item> itemList) {
        this.context = context;
        this.itemList = itemList;
    }

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

    @Override
    public Object getItem(int position) {
        return itemList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;

        if (convertView == null) {
            convertView = LayoutInflater.from(context).inflate(R.layout.list_item, parent, false);
            holder = new ViewHolder();
            holder.imageView = convertView.findViewById(R.id.image_view);
            holder.textView = convertView.findViewById(R.id.text_view);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        Item item = itemList.get(position);
        holder.textView.setText(item.getTitle());

        // 使用Volley加载图片
        ImageRequest imageRequest = new ImageRequest(item.getImageUrl(), new Response.Listener<Bitmap>() {
            @Override
            public void onResponse(Bitmap response) {
                holder.imageView.setImageBitmap(response);
            }
        }, 0, 0, ImageView.ScaleType.CENTER, Bitmap.Config.RGB_565, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                error.printStackTrace();
            }
        });

        // 将ImageRequest加入到请求队列中
        VolleySingleton.getInstance(context).addToRequestQueue(imageRequest);

        return convertView;
    }

    private static class ViewHolder {
        ImageView imageView;
        TextView textView;
    }
}

public class VolleySingleton {
    private static VolleySingleton instance;
    private RequestQueue requestQueue;
    private static Context context;

    private VolleySingleton(Context context) {
        VolleySingleton.context = context;
        requestQueue = getRequestQueue();
    }

    public static synchronized VolleySingleton getInstance(Context context) {
        if (instance == null) {
            instance = new VolleySingleton(context);
        }
        return instance;
    }

    public RequestQueue getRequestQueue() {
        if (requestQueue == null) {
            requestQueue = Volley.newRequestQueue(context.getApplicationContext());
        }
        return requestQueue;
    }

    public <T> void addToRequestQueue(Request<T> request) {
        getRequestQueue().add(request);
    }
}

public class MainActivity extends AppCompatActivity {
    private ListView listView;
    private CustomAdapter adapter;
    private List<Item> itemList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        listView = findViewById(R.id.list_view);
        itemList = new ArrayList<>();
        adapter = new CustomAdapter(this, itemList);
        listView.setAdapter(adapter);

        // 发起JSON请求，解析数据并添加到itemList中
        JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, JSON_URL, null, new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {
                try {
                    JSONArray jsonArray = response.getJSONArray("items");
                    for (int i = 0; i < jsonArray.length(); i++) {
                        JSONObject jsonObject = jsonArray.getJSONObject(i);
                        String title = jsonObject.getString("title");
                        String imageUrl = jsonObject.getString("image_url");
                        Item item = new Item(title, imageUrl);
                        itemList.add(item);
                    }
                    adapter.notifyDataSetChanged();
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                error.printStackTrace();
            }
        });

        // 将JsonObjectRequest加入到请求队列中
        VolleySingleton.getInstance(this).addToRequestQueue(jsonObjectRequest);
    }
}