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<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;}
}

 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<NewsInfo> getNewInfo(String json){Gson gson=new Gson();Type listType=new TypeToken<List<NewsInfo>>(){}.getType();List<NewsInfo> 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<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();}});}}

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.xml</string>
</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。。

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