fragment 展示条目图片

最新推荐文章于 2022-06-30 10:51:15 发布

Wzcrazy

最新推荐文章于 2022-06-30 10:51:15 发布

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本文链接：https://blog.youkuaiyun.com/Wzcrazy/article/details/78442226

该博客展示了如何在Android应用中，通过Fragment加载网络数据，并使用AsyncTask异步下载图片。代码实现了一个ListView，每个条目包含新闻标题和图片。网络数据通过Gson解析，并使用BaseAdapter填充ListView。

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package com.appc.weekxx3;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.hardware.camera2.params.StreamConfigurationMap;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import com.google.gson.Gson;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.List;

public class Fragment1 extends Fragment {
    String url = "https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10";
    private List<com.appc.weekxx3.bean.NewslistBean> list = new ArrayList<>();
    private ListView lv1;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_fragment1, container, false);
        lv1 = view.findViewById(R.id.lv1);
        intodata();
        return view;
    }

    private void intodata() {
        new Ac().execute(url);

    }

    class Ac extends AsyncTask<String, View, String> {

        private String data;

        @Override
        protected String doInBackground(String... params) {

            String param = params[0];
            try {
                URL url = new URL(param);
                HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
                if (urlConnection.getResponseCode() == 200) {
                    InputStream inputStream = urlConnection.getInputStream();
                    Log.e("SSSS", "dsdffgfd");
                    StringBuilder stringBuilder = new StringBuilder();
                    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                    String temp = "";
                    while ((temp = bufferedReader.readLine()) != null) {
                        stringBuilder.append(temp);
                        temp = "";
                    }
                    //这个是网络获取的数据
                    data = stringBuilder.toString();
                    Log.e("SSSS", data + "dsdffgfd");
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            return data;
        }

        @Override
        protected void onPostExecute(String s) {
            Gson gson = new Gson();
            bean bean = gson.fromJson(s, bean.class);
            List<com.appc.weekxx3.bean.NewslistBean> newslist = bean.getNewslist();
            list.addAll(newslist);
            Log.e("SSSS+list", list.toString() + "dsdffgfd");
            adapter adapter = new adapter();
            lv1.setAdapter(adapter);
        }
    }

    class adapter extends BaseAdapter {

        @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) {
            View view = View.inflate(getActivity(), R.layout.item1, null);
            TextView tv = view.findViewById(R.id.tv1);
            ImageView im = view.findViewById(R.id.im1);
            tv.setText(list.get(position).getTitle());
            String picPath = list.get(position).getPicUrl();
            new MyPicTask(im).execute(picPath);
            return view;
        }
    }
    class MyPicTask extends AsyncTask<String, Void, Bitmap> {
        private ImageView img;

        public MyPicTask(ImageView img) {
            this.img = img;
        }

        @Override
        protected Bitmap doInBackground(String... params) {
            try {
                URL url = new URL(params[0]);
                HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                if (connection.getResponseCode() == 200) {
                    InputStream stream = connection.getInputStream();
                    Bitmap bitmap = BitmapFactory.decodeStream(stream);
                    return bitmap;
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }

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