Android模拟实现网易新闻客户端

首先我们先看一下要模拟的界面

我们主要实现的就是ListView解析json文件中的数据，UI布局很简单不做赘述。
这里我们需要一个服务器来实现数据的动态更新， 这里我们用到的是Tomcat8.0。
首先我们把需要解析的json文件放置到Tomcat的webapp文件下的ROOT里面，方便我们解析。

首先我们创建一个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<NewsInfo> getNewInfo(String json){
 Gson gson=new Gson();
 Type listType=new TypeToken<List<NewsInfo>>(){

}.getType();
 List<NewsInfo> newsInfos=gson.fromJson(json,listType);

return newsInfos;
}
}

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;
}
}

activity_main.xml：

<?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>

item的布局文件：

<?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>

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<NewsInfo>{
private int resourceID;
public NewAdapter(Context context, int resource, List<NewsInfo> 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;
}
}

MainActivity实现代码：

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<NewsInfo> 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();

}
 });

}

}

在values文件加下的String.xml文件中添加：

<string name="serverurl">http://172.16.26.58:8080/newInfo.xml</string>

最后一定不要忘了添加网络访问权限， 这很重要， 好多同学都犯了这个错误、

这样基本功能就实现了。