http请求解析json listview多条目展示 +跳转webview展示

1.Mainactivity主页面

package com.example.week01_02;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.List;

import static com.example.week01_02.LoginActivity.URL_KEY;

public class MainActivity extends AppCompatActivity {

    private ListView listView;
    private NewsAdaper mAdaper;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //获取资源id
        listView = findViewById(R.id.lv_list);
        //创建适配器
        mAdaper = new NewsAdaper(MainActivity.this);
        listView.setAdapter(mAdaper);
        //点击跳转
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Intent intent = new Intent(MainActivity.this,LoginActivity.class);
                intent.putExtra(URL_KEY,mAdaper.getItem(position).getUrl());
                startActivity(intent);
            }
        });
        infoData();
    }
    private static String ttUrl = "http://result.eolinker.com/k2BaduF2a6caa275f395919a66ab1dfe4b584cc60685573?uri=tt";
    private static String gnUrl = "http://result.eolinker.com/k2BaduF2a6caa275f395919a66ab1dfe4b584cc60685573?uri=gn";
    @SuppressLint("StaticFieldLeak")
    private void infoData() {
        new AsyncTask<String,Void,List<NewsBean.ResultBean.DataBean>>(){
            @Override
            protected List<NewsBean.ResultBean.DataBean> doInBackground(String... strings) {
                List<NewsBean.ResultBean.DataBean> request = new ArrayList<>();
                for (String url:strings) {
                    NewsBean bean = NetUtil.getRequest(url, NewsBean.class);
                    request.addAll(bean.getResult().getData());
                }
                return request;
            }
            @Override
            protected void onPostExecute(List<NewsBean.ResultBean.DataBean> dataBeans) {
                mAdaper.setmData(dataBeans);
            }
        }.execute(ttUrl,gnUrl);
    }
}

2.Bean类

package com.example.week01_02;

import java.util.List;

public class NewsBean {

    private ResultBean result;

    public ResultBean getResult() {
        return result;
    }

    public void setResult(ResultBean result) {
        this.result = result;
    }

    public static class ResultBean {
  
        private List<DataBean> data;

        public List<DataBean> getData() {
            return data;
        }

        public void setData(List<DataBean> data) {
            this.data = data;
        }

        public static class DataBean {
         
            private static final String tt = "头条";
            private String title;
            private String date;
            private String category;
            private String url;
            private String thumbnail_pic_s;

            public static String getTt() {
                return tt;
            }

            public String getTitle() {
                return title;
            }

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

            public String getDate() {
                return date;
            }

            public void setDate(String date) {
                this.date = date;
            }

            public String getCategory() {
                return category;
            }

            public void setCategory(String category) {
                this.category = category;
            }

            public String getUrl() {
                return url;
            }

            public void setUrl(String url) {
                this.url = url;
            }

            public String getThumbnail_pic_s() {
                return thumbnail_pic_s;
            }

            public void setThumbnail_pic_s(String thumbnail_pic_s) {
                this.thumbnail_pic_s = thumbnail_pic_s;
            }
            public boolean isTT(){
                return category.equals(tt);
            }
        }
    }
}

3.适配器类

package com.example.week01_02;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.VideoView;

import java.util.ArrayList;
import java.util.List;

public class NewsAdaper extends BaseAdapter {
    private List<NewsBean.ResultBean.DataBean> mData;
    private Context mContext;
    private static final int ITEM_COUNT = 2;
    private static final int TT_ITEM = 0;
    private static final int GN_ITEM = 1;
    public NewsAdaper(Context mContext) {
        this.mContext = mContext;
        //初始化
        mData = new ArrayList<>();
    }
    public void setmData(List<NewsBean.ResultBean.DataBean> datas){
        this.mData = datas;
        notifyDataSetChanged();
    }

    @Override
    public int getViewTypeCount() {
        return ITEM_COUNT;
    }

    @Override
    public int getItemViewType(int position) {
        return getItem(position).isTT()?TT_ITEM:GN_ITEM;
    }

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

    @Override
    public NewsBean.ResultBean.DataBean getItem(int position) {
        return mData.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(mContext).inflate(
                    getItemViewType(position)==TT_ITEM?R.layout.tt_item:R.layout.gn_item,parent,false);
            holder = new ViewHolder(convertView);
        }else{
            holder = (ViewHolder) convertView.getTag();
        }
        holder.bind(getItem(position));
        return convertView;
    }
    class ViewHolder{
        ImageView image;
        TextView title;
        TextView date;

        public ViewHolder(View convertView) {
            title = convertView.findViewById(R.id.title);
            date = convertView.findViewById(R.id.date);
            image = convertView.findViewById(R.id.image);
            convertView.setTag(this);
        }

        public void bind(NewsBean.ResultBean.DataBean item) {
            title.setText(item.getTitle());
            date.setText(item.getDate());
            if(image!=null){
                image.setImageResource(R.mipmap.ic_launcher);
            }
        }
    }
}

4.工具类

package com.example.week01_02;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

import com.google.gson.Gson;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class NetUtil {
    //判断是否有网络
    public static boolean hasNetWork(Context context){
        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetworkInfo = cm.getActiveNetworkInfo();
        return activeNetworkInfo!=null&&activeNetworkInfo.isAvailable();
    }
    //执行get请求 返回string
    public static String getRequest(String urlStr){
        String result = "";
        try {
            //定义url地址
            URL url = new URL(urlStr);
            //打开连接
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            //设置请求类型
            urlConnection.setRequestMethod("GET");
            //超时
            urlConnection.setReadTimeout(5000);
            urlConnection.setConnectTimeout(5000);
            //获取请求码
            int responseCode = urlConnection.getResponseCode();
            if(responseCode == 200 ){
                result = stream2String(urlConnection.getInputStream());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }
    //将字节流转换为字符流
    private static String stream2String(InputStream inputStream) throws IOException {
        InputStreamReader isr = new InputStreamReader(inputStream);
        BufferedReader br = new BufferedReader(isr);
        StringBuilder builder = new StringBuilder();
        for(String tem = br.readLine();tem!=null;tem = br.readLine()){
            builder.append(tem);
        }
        return builder.toString();
    }
    //执行get请求 返回Bean
    public static <E> E getRequest(String urlStr,Class clazz){
        String request = getRequest(urlStr);
        E e = (E) new Gson().fromJson(request,clazz);
        return e;
    }
}

5.跳转展示webview页面

package com.example.week01_02;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.webkit.WebView;

public class LoginActivity extends AppCompatActivity {
    public static final String URL_KEY = "url";
    private WebView webView;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        //获取资源id
        webView = findViewById(R.id.web);
        //接收
        String url = getIntent().getStringExtra(URL_KEY);
        webView.loadUrl(url);
    }
}

6.布局页面

6.1mainactivity页面布局
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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">

<ListView
    android:id="@+id/lv_list"
    android:layout_width="0dp"
    android:layout_height="0dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    />

</android.support.constraint.ConstraintLayout>

6.2listview子条目布局
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="8dp"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <ImageView
        android:id="@+id/image"
        android:layout_width="120dp"
        android:layout_height="100dp"
       app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        />
    <TextView
        android:id="@+id/title"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintRight_toLeftOf="@id/image"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="@id/image"
        android:text="标题"
        />
    <TextView
        android:id="@+id/date"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintRight_toLeftOf="@id/image"
        app:layout_constraintLeft_toLeftOf="parent"
        android:text="时间"
        app:layout_constraintBottom_toBottomOf="@id/image"
        />
</android.support.constraint.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <TextView
        android:id="@+id/title"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:maxLines="2"
        android:text="title"
        app:layout_constraintBottom_toTopOf="@id/date"
        />
    <TextView
        android:id="@+id/date"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@id/title"
        android:maxLines="2"
        android:layout_marginTop="15sp"
        android:text="日期"
        />
</android.support.constraint.ConstraintLayout>

6.3跳转页面布局
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <WebView
        android:id="@+id/web"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        />
</android.support.constraint.ConstraintLayout>