安卓 网络新闻列表

activity_main.xml源码

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="欢迎来到梧州新闻网"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

activity_news.xml源码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".NewsActivity">

    <ListView
        android:id="@+id/news_list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"></ListView>

</LinearLayout>


news_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/new_img"
        android:layout_width="58dp"
        android:layout_height="58dp"
        android:layout_margin="5dp" />

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:layout_weight="4"
            android:layout_margin="15dp">
            <TextView
                android:id="@+id/news_title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textStyle="bold"
                android:textSize="14dp"
                android:text="我是标题"/>
            <TextView
                android:id="@+id/news_content"
                android:layout_width="160dp"
                android:layout_height="wrap_content"
                android:layout_marginTop="5dp"
                android:singleLine="false"
                android:textSize="11dp"
                android:text="我是内容"/>
        </LinearLayout>

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:layout_weight="1"
            android:layout_marginTop="30dp">
            <RelativeLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content">
                <LinearLayout
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal">
                    <TextView
                        android:id="@+id/type_title"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_margin="3dp"
                        android:textColor="#4CAF50"
                        android:textSize="11dp"
                        android:text="类型："/>
                    <TextView
                        android:id="@+id/type"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:textColor="#4CAF50"
                        android:layout_toLeftOf="@+id/type_title"
                        android:textSize="11dp"
                        android:layout_margin="3dp"
                        android:text="1"/>
                </LinearLayout>

            </RelativeLayout>

            <RelativeLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content">
                <LinearLayout
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal">
                    <TextView
                        android:id="@+id/comment_title"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_margin="3dp"
                        android:textColor="#4CAF50"
                        android:textSize="11dp"
                        android:text="评论："/>
                    <TextView
                        android:id="@+id/comment"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_margin="3dp"
                        android:layout_toLeftOf="@+id/comment_title"
                        android:textColor="#4CAF50"
                        android:textSize="11dp"
                        android:text="100"/>
                </LinearLayout>

            </RelativeLayout>

        </LinearLayout>

</LinearLayout>

2.后台源码
实体类：新闻类

package com.gxuwz.newslist.entity;

public class News {

    private String icon;
    private String title;
    private String content;
    private String type;
    private String comment;

    public News() {
    }

    public News(String icon, String title, String content, String type, String comment) {
        this.icon = icon;
        this.title = title;
        this.content = content;
        this.type = type;
        this.comment = comment;
    }

    public String getIcon() {
        return icon;
    }

    public void setIcon(String icon) {
        this.icon = icon;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public String getComment() {
        return comment;
    }

    public void setComment(String comment) {
        this.comment = comment;
    }

    @Override
    public String toString() {
        return "News{" +
                "icon='" + icon + '\'' +
                ", title='" + title + '\'' +
                ", content='" + content + '\'' +
                ", type='" + type + '\'' +
                ", comment='" + comment + '\'' +
                '}';
    }
}

Http请求类

package com.gxuwz.newslist.util;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;

import org.apache.commons.io.IOUtils;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

public class HttpUtil {

    public static int http(String httpUrl, String methodType, int timeout,Handler handler){
        try {
            URL url = new URL(httpUrl);
            HttpURLConnection conn = (HttpURLConnection)url.openConnection();
            //请求方式
            conn.setRequestMethod(methodType);
            //默认是毫秒
            conn.setConnectTimeout(timeout);
            int code = conn.getResponseCode();
            if(code == 200) {
                //获取服务器返回的内容，而且通过输入流的方式得到
                InputStream in = conn.getInputStream();
                //判断输入流有多少可以读取的字节
                //int i = in.available();
                //定义字节数组接收回来的数据
                //byte[] b = new byte[1281];
                //将输入存入字节数组
                //in.read(b);
                //先把字节数组转换成字符串
                String result = IOUtils.toString(in, "UTF-8");
                Log.i("result====",result);
                //吧子线程数据回传到主线程
                Message msg = new Message();
                Bundle bundle = new Bundle();
                bundle.putString("result",result);
                msg.setData(bundle);
                msg.what = 1;
                handler.sendMessage(msg);
            }
            conn.disconnect();
            return 1;
        } catch (MalformedURLException e) {
            e.printStackTrace();
            return 0;
        } catch (IOException e) {
            e.printStackTrace();
            return 0;
        }
    }

    public static Bitmap getInternetImage(String UrlPath,Handler handler) {
        Bitmap bm = null;
        String urlpath = UrlPath;
        // 2、获取Uri
        try {
            URL uri = new URL(urlpath);

            // 3、获取连接对象、此时还没有建立连接
            HttpURLConnection connection = (HttpURLConnection) uri.openConnection();
            // 4、初始化连接对象
            // 设置请求的方法，注意大写
            connection.setRequestMethod("GET");
            // 读取超时
            connection.setReadTimeout(5000);
            // 设置连接超时
            connection.setConnectTimeout(5000);
            // 5、建立连接
            connection.connect();

            // 6、获取成功判断,获取响应码
            if (connection.getResponseCode() == 200) {
                // 7、拿到服务器返回的流，客户端请求的数据，就保存在流当中
                InputStream is = connection.getInputStream();
                // 8、从流中读取数据，构造一个图片对象GoogleAPI
                bm = BitmapFactory.decodeStream(is);
                // 9、把图片设置到UI主线程
                // ImageView中,获取网络资源是耗时操作需放在子线程中进行,通过创建消息发送消息给主线程刷新控件；

                Log.i("", "网络请求成功");

            } else {
                Log.v("tag", "网络请求失败");
                bm = null;
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return bm;
    }
}

MainActivity.jave

package com.gxuwz.newslist;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        new Thread(){
            @Override
            public void run() {
                try {
                    sleep(1500);
                    Intent intent = new Intent(MainActivity.this,NewsActivity.class);
                    startActivity(intent);
                    finish();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }.start();
    }
}

NewsActivity.jave

package com.gxuwz.newslist;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
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 com.google.gson.reflect.TypeToken;
import com.gxuwz.newslist.entity.News;
import com.gxuwz.newslist.util.HttpUtil;

import org.json.JSONException;
import org.json.JSONObject;

import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class NewsActivity extends AppCompatActivity {

    //String[] newsTitleStr = new String[]{"腾讯新闻","QQ新闻","yy新闻","XX新闻"};
    // String[] newsConStr = new String[]{"腾讯新闻腾讯新闻","QQ新闻QQ新闻","yy新闻yy新闻yy新闻","XX新闻XX新闻XX新闻"};
    int[] imgs = new int[]{R.mipmap.scarf,R.mipmap.kiwifruit,R.mipmap.apple,R.mipmap.cake};

    ListView newsListView;

    List<News> dataList;

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

        newsListView = findViewById(R.id.news_list);

        new Thread(new Runnable() {
            @Override
            public void run() {
                HttpUtil.http("http://www.zhou.website:8080/work05.json","GET",5000,handler);
            }
        }).start();
    }

    Handler handler = new Handler(){
        @Override
        public void handleMessage(@NonNull Message msg) {
            super.handleMessage(msg);
            if(msg.what==1){
                Bundle bundle = msg.getData();
                String result = bundle.getString("result");
                Gson gson = new Gson();
                Type listType = new TypeToken<List<News>>(){}.getType();
                List<News> newsList = gson.fromJson(result,listType);
                if(newsList != null) {
                    dataList = newsList;
                    MyBaseAdapter myBaseAdapter = new MyBaseAdapter();
                    newsListView.setAdapter(myBaseAdapter);
                }
            }
        }
    };


    class MyBaseAdapter extends BaseAdapter{

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

        @Override
        public News getItem(int position) {
            return dataList.get(position);
        }

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

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            convertView = View.inflate(NewsActivity.this,R.layout.news_item,null);
            final ImageView img = convertView.findViewById(R.id.new_img);
            TextView title = convertView.findViewById(R.id.news_title);
            TextView content = convertView.findViewById(R.id.news_content);
            TextView type = convertView.findViewById(R.id.type);
            TextView comment = convertView.findViewById(R.id.comment);
            final News news = dataList.get(position);
            final Handler handler1 = new Handler() {
                public void handleMessage(android.os.Message msg) {
                    img.setImageBitmap((Bitmap) msg.obj);
                };
            };
            //往控件中写入内容
            new Thread(){
                @Override
                public void run() {
                    Bitmap bm = HttpUtil.getInternetImage(news.getIcon(),handler1);
                    Message msg = new Message();
                    // 把bm存入消息中,发送到主线程
                    msg.obj = bm;
                    handler1.sendMessage(msg);
                }
            }.start();

            title.setText(news.getTitle());
            content.setText(news.getContent());
            type.setText(news.getType());
            comment.setText(news.getComment());
            //将处理好的视图返回给适配器
            return convertView;
        }
    }
}