简单新闻客户端案例

首先，在project视图下的app文件夹下的libs文件夹下导入三个包：

package com.example.bz0209.news.dao;

import Android.util.Xml;

import com.example.bz0209.news.entity.NewsInfo;

import org.xmlpull.v1.XmlPullParser;

import Java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

/** * Created by Administrator on 2017/5/22. */

public class NewsInfoService {
    public static List<NewsInfo> getNewsInfos(InputStream is){
        XmlPullParser parser= Xml.newPullParser();
        try{
            parser.setInput(is,"utf-8");
            int type=parser.getEventType();
            List<NewsInfo> newsInfos=null;
            NewsInfo newsInfo=null;
            while (type!=XmlPullParser.END_DOCUMENT){
                switch (type){
                    case XmlPullParser.START_TAG:
                        if("news".equals(parser.getName())){
                            newsInfos=new ArrayList<NewsInfo>();
                        }else if("newsInfo".equals(parser.getName())){
                            newsInfo=new NewsInfo();
                        }else if("icon".equals(parser.getName())){
                            String icon=parser.nextText();
                            newsInfo.setIconPath(icon);
                        }else if("title".equals(parser.getName())){
                            String title=parser.nextText();
                            newsInfo.setTitle(title);
                        }else if("content".equals(parser.getName())){
                            String description=parser.nextText();
                            newsInfo.setDescription(description);
                        }else if("type".equals(parser.getName())){
                            String newsType=parser.nextText();
                            newsInfo.setType(Integer.parseInt(newsType));
                        }else if("comment".equals(parser.getName())){
                            String comment=parser.nextText();
                            newsInfo.setComment(Long.parseLong(comment));
                        }
                        break;
            }
                type=parser.next();
            }
            return newsInfos;
        }catch(Exception e){
            e.printStackTrace();
            return null;
        }
    }
}

config.xml文件代码如下：

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="serverurl">http://10.51.30.166:8080/newInfo.xml</string>
</resources>

5.编写用户交互代码，并进行List View的适配器编码，并用AysncHttpClient获取服务器的Xml文件

package com.example.bz0209.news;

import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.widget.BaseAdapter;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import cz.msebera.android.httpclient.Header;
import com.example.bz0209.news.dao.NewsInfoService;
import com.example.bz0209.news.entity.NewsInfo;
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.image.SmartImageView;

import java.io.ByteArrayInputStream;
import java.util.List;
import java.util.Objects;

import static android.R.id.content;


public class MainActivity extends AppCompatActivity {
    private ListView lv_news;
    private LinearLayout loading;
    private List<NewsInfo> newsInfos;
    private class NewsAdapter extends BaseAdapter{
        public int getCount(){
            return newsInfos.size();
        }

        @Override
        public View getView(int i, View view, ViewGroup viewGroup) {
            return null;
        }

        public View getView(int position, View convertView, ViewParent parent){
            View view=View.inflate(MainActivity.this,R.layout.item,null);
            SmartImageView siv= (SmartImageView) view.findViewById(R.id.siv_icon);
            TextView tv_title= (TextView) view.findViewById(R.id.tv_title);
            TextView tv_description= (TextView) view.findViewById(R.id.tv_description);
            TextView tv_type= (TextView) view.findViewById(R.id.tv_type);
            NewsInfo newsInfo=newsInfos.get(position);
            siv.setImageUrl(newsInfo.getIconPath(),R.drawable.a,R.drawable.ic_launcher);
            tv_title.setText(newsInfo.getTitle());
            tv_description.setText(newsInfo.getDescription());
            tv_type.setText(newsInfo.getType());
            int type=newsInfo.getType();
            switch (type){
                case 1:
                    tv_type.setText("comment"+newsInfo.getComment());
                    break;
                case 2:
                    tv_type.setTextColor(Color.RED);
                    tv_type.setText("headline");
                    break;
                case 3:
                    tv_type.setTextColor(Color.BLUE);
                    tv_type.setText("LIVE");
                    break;
            }
            return view;
        }
        public Object getItem(int position){
            return null;
        }
        public long getItemId(int position){
            return 0;
        }
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        lv_news=(ListView)findViewById(R.id.lv_news);
        loading=(LinearLayout)findViewById(R.id.loading);
        fillData2();
    }
    private void fillData2(){
        AsyncHttpClient asyncHttpClient=new AsyncHttpClient();
        asyncHttpClient.get(getString(R.string.serverurl), new AsyncHttpResponseHandler() {
            @Override
            public void onSuccess(String content) {
                super.onSuccess(content);
                byte[] bytes=content.getBytes();
                ByteArrayInputStream bs=new ByteArrayInputStream(bytes);
                newsInfos= NewsInfoService.getNewsInfos(bs);
                if(newsInfos==null){
                    Toast.makeText(MainActivity.this,"fail",Toast.LENGTH_LONG).show();
                }else{
                    loading.setVisibility(View.INVISIBLE);
                    lv_news.setAdapter(new NewsAdapter());
                }
            }

            @Override
            public void onFailure(Throwable error,String content) {
                super.onFailure(error,content);
                Toast.makeText(MainActivity.this, "request fail", Toast.LENGTH_SHORT).show();
            }
        });
    }
}

6.配置服务器，先开启服务器并运行start.bat。把要解析的xml文件放入到tomcat的bin文件夹下的web apps的root文件夹下