安卓开发之简易新闻客户端

 Entity包下创建实体类NewsInfo

package cn.edu.bzu.myapplication.entity;

/**
 * Created by Administrator 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;
    }
}

 adapter包下创建NewsAdapter类

package cn.edu.bzu.myapplication.adapter;

/**
 * Created by Administrator on 2017/4/21.
 */
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;
    }
}

 Tools包下创建工具类JsonParse负责解析JSON数据

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 Administrator 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;
    }
}

界面逻辑代码的设计与实现

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();

            }
        });



    }

}

主布局文件如下

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

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <LinearLayout
            android:id="@+id/loading"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:gravity="center"
            android:orientation="vertical"
            android:visibility="invisible">
            <ProgressBar
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="正在加载信息..." />
        LinearLayout>
        <ListView
            android:id="@+id/lv_news"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
    FrameLayout>
LinearLayout>

news_item.xml如下

xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="65dp">
    <com.loopj.android.image.SmartImageView
        android:id="@+id/siv_icon"
        android:layout_width="80dp"
        android:layout_height="60dp"
        android:scaleType="centerCrop"
        android:src="@mipmap/ic_launcher"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true">com.loopj.android.image.SmartImageView>
    <TextView
        android:id="@+id/tv_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="5dp"
        android:layout_marginTop="10dp"
        android:layout_toRightOf="@id/siv_icon"
        android:ellipsize="end"
        android:maxLength="20"
        android:singleLine="true"
        android:text="我是标题"
        android:textColor="#000000"
        android:textSize="18sp" />

    <TextView
        android:id="@+id/tv_description"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/tv_title"
        android:layout_marginLeft="5dp"
        android:layout_marginTop="5dp"
        android:layout_toRightOf="@id/siv_icon"
        android:ellipsize="end"
        android:maxLength="16"
        android:maxLines="1"
        android:text="我是描述"
        android:textColor="#99000000"
        android:textSize="14sp" />

    <TextView
        android:id="@+id/tv_type"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_marginBottom="5dp"
        android:layout_marginRight="10dp"
        android:text="评论"
        android:textColor="#99000000"
        android:textSize="12sp" />

RelativeLayout>

value下建一个configure.xml文件

xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="serverurl">http://172.16.26.58:8080/newInfo.xmlstring>
resources>

在tomcat目录下打开webapps 将写好的NewInfo.xml放置在ROOT文件下 

启动tomcat服务器 就可看到运行的界面了。。