Android之模拟网易新闻客户端

本实验主要是ListView解析json文件中的数据，需要Tomcat8.0来实现数据的动态更新。首先把需要解析的json文件放置到Tomcat的webapp文件下的ROOT里面。

首先创建一个JsonParse类用来解析json文件：

package cn.edu.bzu.myapplication.Tools;import com.google.gson.Gson;import com.google.gson.reflect.TypeToken;import java.lang.reflect.Type;import java.util.List;import cn.edu.bzu.myapplication.entity.NewsInfo;/** * Created by Becauseshy on 2017/5/18. */public class JsonParse {    public static List getNewInfo(String json){        Gson gson=new Gson();        Type listType=new TypeToken>(){        }.getType();        List newsInfos=gson.fromJson(json,listType);       return newsInfos;    }}

2.创建json文件的实体类：

package cn.edu.bzu.myapplication.entity;/** * Created by Becauseshy on 2017/5/17. */public class NewsInfo {    private String iconPath;    private String title;    private String description;    private int type;    private long comment;    public String getIconPath() {        return iconPath;    }    public void setIconPath(String iconPath) {        this.iconPath = iconPath;    }    public String getTitle() {        return title;    }    public void setTitle(String title) {        this.title = title;    }    public String getDescription() {        return description;    }    public void setDescription(String description) {        this.description = description;    }    public int getType() {        return type;    }    public void setType(int type) {        this.type = type;    }    public long getComment() {        return comment;    }    public void setComment(long comment) {        this.comment = comment;    }}

3.页面布局

<?xml version="1.0" encoding="utf-8"?>

4. item的布局文件

<?xml version="1.0" encoding="utf-8"?>

5. 适配器代码

package cn.edu.bzu.myapplication.adapter;/** * Created by Becauseshy on 2017/5/17. */import android.content.Context;import android.graphics.Color;import android.support.annotation.NonNull;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ArrayAdapter;import android.widget.TextView;import com.loopj.android.image.SmartImageView;import java.util.List;import cn.edu.bzu.myapplication.R;import cn.edu.bzu.myapplication.entity.NewsInfo;public class NewAdapter extends ArrayAdapter{private  int resourceID;    public NewAdapter(Context context, int resource, List objects) {        super(context, resource, objects);        resourceID=resource;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        NewsInfo fruit=getItem(position);        View view;        ViewHolder viewHolder;        if(convertView==null){             view=LayoutInflater.from(getContext()).inflate(resourceID,null);             viewHolder=new ViewHolder();            viewHolder.siv=(SmartImageView)view.findViewById(R.id.siv_icon);            viewHolder.tv_title=(TextView)view.findViewById(R.id.tv_title);            viewHolder.tv_description=(TextView)view.findViewById(R.id.tv_description);            viewHolder.tv_type=(TextView)view.findViewById(R.id.tv_type);            view.setTag(viewHolder);        }else{            view=convertView;            viewHolder= (ViewHolder) view.getTag();        }        viewHolder.siv.setImageUrl(fruit.getIconPath(),R.drawable.a,R.drawable.ic_launcher);        viewHolder.tv_title.setText(fruit.getTitle());        viewHolder.tv_description.setText(fruit.getDescription());        int type=fruit.getType();        switch (type){            case 1:                viewHolder.tv_type.setText("评论："+fruit.getComment());                viewHolder.tv_type.setTextColor(Color.BLUE);                break;            case 2:                viewHolder.tv_type.setText("专题");                viewHolder.tv_type.setTextColor(Color.BLACK);                break;            case 3:                viewHolder.tv_type.setText("LIVE");                viewHolder.tv_type.setTextColor(Color.RED);                break;        }        return view;    }    class ViewHolder{        SmartImageView siv;        TextView tv_title;        TextView tv_description;        TextView tv_type;    }}

6. MainActivity

package cn.edu.bzu.myapplication;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.LinearLayout;import android.widget.ListView;import android.widget.Toast;import com.loopj.android.http.AsyncHttpClient;import com.loopj.android.http.AsyncHttpResponseHandler;import java.io.UnsupportedEncodingException;import java.util.ArrayList;import java.util.List;import cn.edu.bzu.myapplication.Tools.JsonParse;import cn.edu.bzu.myapplication.adapter.NewAdapter;import cn.edu.bzu.myapplication.entity.NewsInfo;import cn.edu.bzu.myapplication.model.Fruit;public class MainActivity extends AppCompatActivity {    private ListView Iv_news;    private NewAdapter newAdapter;    private List newInfos;    private LinearLayout loading;    private JsonParse jsonParse;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Iv_news= (ListView) findViewById(R.id.lv_news);        newAdapter =new NewAdapter(this,R.layout.news_item,newInfos);        loading= (LinearLayout) findViewById(R.id.loading);        prepareData();    }    private void prepareData() {        //fruitList=new ArrayList<>();        //Fruit apple=new Fruit("Apple",R.drawable.apple_pic);       // fruitList.add(apple);        AsyncHttpClient asyncHttpClient=new AsyncHttpClient();        asyncHttpClient.get(getString(R.string.serverurl), new AsyncHttpResponseHandler() {            @Override            public void onSuccess(int i, cz.msebera.android.httpclient.Header[] headers, byte[] bytes) {                try {                    String json=new String(bytes,"utf-8");                    newInfos=jsonParse.getNewInfo(json);                    if(newInfos==null){                        Toast.makeText(MainActivity.this,"解析失败",Toast.LENGTH_SHORT).show();                    }                    else {                        loading.setVisibility(View.INVISIBLE);                        Iv_news.setAdapter(newAdapter);                    }                } catch (UnsupportedEncodingException e) {                    e.printStackTrace();                }            }            @Override            public void onFailure(int i, cz.msebera.android.httpclient.Header[] headers, byte[] bytes, Throwable throwable) {                Toast.makeText(MainActivity.this,"请求失败",Toast.LENGTH_SHORT).show();            }        });    }}

7. 在values文件加下的String.xml文件中添加

http://172.16.26.58:8080/newInfo.xml

本实验的仿照界面:

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