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。

1. 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

4. item的布局文件

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: