Android(安卓)新闻客户端案例
16lz
2021-12-30
源码下载网站:https://github.com/
运用下载的api SmartImage
新闻客户端
介绍
1.UI效果是公司里面美工去画的
2.应用的传输数据,定义借接口
3.关于xml的数据是服务器开发人员通过一定的技术手段返回的,对于Android开发人员我们要做的就是解析,把我们关心的数据取出来,展示到Android中控件上
实现
1.MainActivity
package activitytest.example.com.news;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.ListView;import android.widget.TextView;import com.jit.lib.SmartImage;import com.jit.lib.SmartImageView;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;import java.util.List;public class MainActivity extends AppCompatActivity { List newsList; ListView lv; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //【1】找到控件 lv = findViewById(R.id.lv); //【2】准备ListView数据要显示的数据,去服务器取数据进行封装 initListData(); } //准备ListView的数据 private void initListData() { new Thread() { @Override public void run() { try { //【2】去服务器取数据 http://192.168.11.86:8080/news.xml String path = "http://192.168.11.86:8080/news.xml"; //【2.2】创建URL对象指定我们要访问的网址(路径) URL url = new URL(path); //【2.3】拿到HttpURLConnection对象 用于发送或接受数据 HttpURLConnection conn = (HttpURLConnection) url.openConnection(); //【2.4】设置发送get请求 conn.setRequestMethod("GET"); //【2.5】设置请求时间 conn.setConnectTimeout(5000); //【2.6】获取服务器返回的状态码 int code = conn.getResponseCode(); //【2.7】如果code == 200说明请求成功 if (code == 200) { //【2.8】获取服务器返回的数据 是以流的形式返回的 InputStream in = conn.getInputStream(); //【2.9】解析xml 抽出一个业务方法 newsList = XmlParserUtils.parserXml(in); //解析完,要展示的数据放到了集合中 //【3】更新ui 把数据展示到listview上 runOnUiThread(new Runnable() { @Override public void run() { lv.setAdapter(new MyAdapter()); } }); } } catch (Exception e) { e.printStackTrace(); } } }.start(); } //定义数据适配器 private class MyAdapter extends BaseAdapter { @Override public int getCount() { return newsList.size(); } @Override public Object getItem(int i) { return null; } @Override public long getItemId(int i) { return 0; } @Override public View getView(int i, View view, ViewGroup viewGroup) { View v; if (view == null) { v = View.inflate(MainActivity.this, R.layout.item, null); } else { v = view; } //【1】找到控件显示集合里面的数据 SmartImageView iv_icon = v.findViewById(R.id.iv_icon); TextView tv_title = v.findViewById(R.id.tv_title); TextView tv_desc = v.findViewById(R.id.tv_desc); TextView tv_type = v.findViewById(R.id.tv_type); //【1.1】展示图片的数据 String imageUrl = newsList.get(i).getImage(); //下载SmartImage iv_icon.setImageUrl(imageUrl); //【2】显示数据 tv_title.setText(newsList.get(i).getTitle()); tv_desc.setText(newsList.get(i).getDescription()); String typee = newsList.get(i).getType(); String comment = newsList.get(i).getComment(); int type = Integer.parseInt(typee); switch (type) { case 1: tv_type.setText(comment + "国内"); break; case 2: tv_type.setText("跟帖"); break; case 3: tv_type.setText("国外"); break; } return v; } }}
2.News
package activitytest.example.com.news;public class News { 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 String getImage() { return image; } public void setImage(String image) { this.image = image; } public String getType() { return type; } public void setType(String type) { this.type = type; } public String getComment() { return comment; } public void setComment(String comment) { this.comment = comment; } private String title; private String description; private String image; private String type; private String comment;}
3.XmlParserUtils
package activitytest.example.com.news;import android.util.Xml;import org.xmlpull.v1.XmlPullParser;import java.io.InputStream;import java.util.ArrayList;import java.util.List;public class XmlParserUtils { //解析xml的业务方法 public static List parserXml(InputStream in) throws Exception{ List newsLists = null; News news = null; //【1】获取xml的解析器 XmlPullParser parser = Xml.newPullParser(); //【2】设置解析器要解析的内容 parser.setInput(in,"utf-8"); //【3】获取解析的事件类型 int type = parser.getEventType(); //【4】不停的向下解析 while (type!=XmlPullParser.END_DOCUMENT){ //【5】具体判断一下解析的是开始节点还是结束节点 switch (type){ case XmlPullParser.START_TAG: //解析开始的标签 //【6】具体判断一下解析的是哪个标签 if("channel".equals(parser.getName())){ //如果是channel标签 //创建一个list集合 newsLists = new ArrayList(); }else if ("item".equals(parser.getName())){ news = new News(); }else if ("tetle".equals(parser.getName())){ news.setTitle(parser.nextText()); }else if ("description".equals(parser.getName())){ news.setDescription(parser.nextText()); }else if ("image".equals(parser.getName())){ news.setImage(parser.nextText()); }else if ("type".equals(parser.getName())){ news.setType(parser.nextText()); }else if ("comment".equals(parser.getName())){ news.setComment(parser.nextText()); } break; case XmlPullParser.END_TAG: //解析结束的标签 if ("item".equals(parser.getName())){ newsLists.add(news); //将javabean对象加到集合中 } break; } //不停的向下解析 type = parser.next(); } return newsLists; }}
4.activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
5.item.xml
<?xml version="1.0" encoding="utf-8"?>
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