ArrayList<User.DataBean> arrayList = new ArrayList<User.DataBean>();
private MyAdapter myAdapter;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.frag01,container,false);

   ListView listView = view.findViewById(R.id.list);
    myAdapter = new MyAdapter(getActivity(),arrayList);
    listView.setAdapter(myAdapter);
    new MyasyncTask().execute(urlString);


    return view;
}

private class MyasyncTask extends AsyncTask<String,Void,List<User.DataBean>> {

    @Override
    protected List<User.DataBean> doInBackground(String... strings) {
        List<User.DataBean> data = Net.getJson(strings[0]);
        return data;
    }

    @Override
    protected void onPostExecute(List<User.DataBean> dataBeans) {
        super.onPostExecute(dataBeans);
        arrayList.addAll(dataBeans);
        myAdapter.notifyDataSetChanged();
    }
}
 

}

創作netUtil class Net { public static List<User.DataBean> getJson(String string) { try { URL url = new URL(string); HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection(); int responseCode = urlConnection.getResponseCode(); if (responseCode200){ InputStream inputStream = urlConnection.getInputStream(); BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream)); String str1=""; StringBuilder stringBuilder = new StringBuilder(); while ((str1=bufferedReader.readLine())!=null){ stringBuilder.append(str1); } Gson gson = new Gson(); User json = gson.fromJson(String.valueOf(stringBuilder),User.class); List<User.DataBean> list = json.getData(); return list; } } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return null; } public static Bitmap getBitmap(String string){ URL url = null; try { url = new URL(string); HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection(); int responseCode = urlConnection.getResponseCode(); if (responseCode

然後再來一個介面卡 public class MyAdapter extends BaseAdapter { private Context context; private ArrayList<User.DataBean> list;

public MyAdapter(Context context, ArrayList<User.DataBean> list) {
    this.context = context;
    this.list = list;
}

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

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

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

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

    ViewHolder holder = null;
    if (convertView==null){
        convertView=View.inflate(context, R.layout.listview,null);
        holder = new ViewHolder();
        holder.textView1 = convertView.findViewById(R.id.textView1);
        holder.textView2 = convertView.findViewById(R.id.textView2);
        holder.textView3 = convertView.findViewById(R.id.textView3);
        holder.textView4 = convertView.findViewById(R.id.textView4);
        holder.imageView1 = convertView.findViewById(R.id.imageView1);

        convertView.setTag(holder);

    }else{
        holder = (ViewHolder) convertView.getTag();

    }
    User.DataBean bean= list.get(position);
    holder.textView1.setText(bean.getNews_id());
    holder.textView2.setText(bean.getNews_title());
    holder.textView3.setText(bean.getNews_summary());
    holder.textView4.setText(bean.getPic_url());
    new MyasyncTaskb(holder.imageView1).execute(bean.getPic_url());
    return convertView;
}
class ViewHolder{
    TextView textView1;
    TextView textView2;
    TextView textView3;
    TextView textView4;
    ImageView imageView1;
}
class MyasyncTaskb extends AsyncTask<String,Void,Bitmap>{


    ImageView imageView1;
    public MyasyncTaskb(ImageView imageView1){
        this.imageView1 = imageView1;
    }

    @Override
    protected Bitmap doInBackground(String... strings) {
        Bitmap bitmap = Net.getBitmap(strings[0]);
        return bitmap;
    }

    @Override
    protected void onPostExecute(Bitmap bitmap) {
        super.onPostExecute(bitmap);
        imageView1.setImageBitmap(bitmap);
    }
}

}