Android开发-营养成分查询Demo(1)前言-AndroidStudio

转载请注明出处：http://blog.csdn.net/iwanghang/article/details/70882420

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之前公司有个洽谈的项目，需要用到一个查询食品营养成分的功能，百度了一下没有相关的开放API。没办法了，那就找相关网站，解析XML了吧。另外，甲方还要求显示成分百分比，正是这一点，吸引我在工作之余做了Demo进行练习。下面，我会用演示一下Demo是如何一步一步进行实现的。

随便找个关键词搜索，比如马铃薯，从浏览器复制url，进行xml解析，显示到列表，显示出来一些基本信息，我们的第一步就算完成，如下图：

项目下载：http://download.csdn.net/detail/iwanghang/9828141

MainActivity.java：

package com.iwanghang.booheesearchdemo;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.ListView;import android.widget.Toast;import java.util.ArrayList;public class MainActivity extends AppCompatActivity {    // 显示食物的ListAdapter    private FoodListAdapter foodListAdapter;    // 显示食物的Lis    private ListView listView_food;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        listView_food = (ListView) findViewById(R.id.listView_food);        sendRequestForListData();    }    private void sendRequestForListData() {        try {            final SocketConnAsync socketConnAsync = new SocketConnAsync();            socketConnAsync.execute(Constant.MALINGSHU);            socketConnAsync.setOnAsyncResponse(new AsyncResponse() {                @Override                public void onDataReceivedSuccess(ArrayList<SearchResult> searchResults) {                    System.out.println("onDataReceivedSuccess");                    System.out.println("searchResults：" + searchResults);                    foodListAdapter = new FoodListAdapter(getApplication(),searchResults);                    listView_food.setAdapter(foodListAdapter);                }                @Override                public void onDataReceivedFailed() {                    Toast.makeText(MainActivity.this, "data received failed!", Toast.LENGTH_SHORT).show();                }            });        } catch (Exception e) {            e.printStackTrace();        }    }}

FoodListAdapter.java：

package com.iwanghang.booheesearchdemo;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.TextView;import java.util.ArrayList;public class FoodListAdapter extends BaseAdapter {    private Context ctx; // 上下文对象引用    private ArrayList<SearchResult> searchResults;// 存放SearchResult引用的集合    private SearchResult searchResult; // SearchResult对象引用    /**     * 构造函数     * @param ctx    上下文     * @param searchResults  集合对象     */    public FoodListAdapter(Context ctx, ArrayList<SearchResult> searchResults){        this.ctx = ctx;        this.searchResults = searchResults;        //System.out.println("MyMusicListAdapter.java #0 : ctx = " + ctx + ",mp3Infos = " + mp3Infos.size());    }    public ArrayList<SearchResult> searchResults() {        System.out.println("FoodListAdapter.java #1 : public ArrayList<SearchResult> searchResults() {");        return searchResults;    }    public void setSearchResults(ArrayList<SearchResult> searchResults) {        System.out.println("FoodListAdapter.java #2 : public void setMp3Infos(ArrayList<SearchResult> searchResults) {");        this.searchResults = searchResults;    }    public ArrayList<SearchResult> getSearchResults() {        return searchResults;    }    @Override    public int getCount() {        //System.out.println("FoodListAdapter.java #3 : public int getCount() {" + mp3Infos.size());        //return mp3Infos.size();        return searchResults.size();    }    @Override    public Object getItem(int position) {        System.out.println("FoodListAdapter.java #4 : public Object getItem(int position) {");        return searchResults.get(position);    }    @Override    public long getItemId(int position) {        //System.out.println("FoodListAdapter.java #5 : public long getItemId(int position) {");        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        //System.out.println("FoodListAdapter.java #6 : public View getView ");        ViewHolder vh;        if(convertView==null){            //vh = new ViewHolder();            convertView = LayoutInflater.from(ctx).inflate(R.layout.item_food_list,null);            vh = new ViewHolder();            vh.tv_foodName = (TextView) convertView.findViewById(R.id.tv_foodName);            vh.tv_kaLuli = (TextView) convertView.findViewById(R.id.tv_kaLuli);            //vh.textView3_time = (TextView) convertView.findViewById(R.id.textView3_time);            //vh.imageView1_ablum = (ImageView) convertView.findViewById(R.id.imageView1_ablum);            //System.out.println("NetMusicListAdapter.java #7 : textView1_title = " + vh.textView1_title);            convertView.setTag(vh);//表示给View添加一个格外的数据，        }else {            vh = (ViewHolder)convertView.getTag();//通过getTag的方法将数据取出来        }        SearchResult searchResult = searchResults.get(position);        vh.tv_foodName.setText(searchResult.getFoodName()); // 显示 食物        vh.tv_kaLuli.setText(searchResult.getFoodKa()); // 显示 卡路里        return convertView;    }    /**     * 定义一个内部类     * 声明相应的控件引用     */    static class ViewHolder{        // 所有控件对象引用        TextView tv_foodName; // 食物        TextView tv_kaLuli; // 卡路里    }}

SearchResult.java：

package com.iwanghang.booheesearchdemo;public class SearchResult {    private String foodName;    private String foodPic;    private String foodUrl;    private String foodKa; // 卡路里    // set方法,get方法    public String getFoodName() {        return foodName;    }    public void setFoodName(String foodName) {        this.foodName = foodName;    }    public String getFoodPic() {        return foodPic;    }    public void setFoodPic(String foodPic) {        this.foodPic = foodPic;    }    public String getFoodUrl() {        return foodUrl;    }    public void setFoodUrl(String foodUrl) {        this.foodUrl = foodUrl;    }    public String getFoodKa() {        return foodKa;    }    public void setFoodKa(String foodKa) {        this.foodKa = foodKa;    }    @Override    public String toString() {        return "SearchResult{" +                "foodName='" + foodName + '\'' +                ", foodPic='" + foodPic + '\'' +                ", foodUrl='" + foodUrl + '\'' +                ", foodKa='" + foodKa + '\'' +                '}';    }}

SocketConnAsync.java：

package com.iwanghang.booheesearchdemo;import android.os.AsyncTask;import org.jsoup.Jsoup;import org.jsoup.nodes.Document;import org.jsoup.select.Elements;import java.io.IOException;import java.util.ArrayList;class SocketConnAsync extends AsyncTask<String,Integer,Integer> {    // 存放 食物 的 集合    private ArrayList<SearchResult> searchResults = new ArrayList<SearchResult>();    // AsyncResponse 接口回调    public AsyncResponse asyncResponse;    public void setOnAsyncResponse(AsyncResponse asyncResponse)    {        this.asyncResponse = asyncResponse;    }    @Override    protected Integer doInBackground(String... params) {        String url = params[0];        try {            // url = "http://music.migu.cn/webfront/searchNew/searchAll.do?keyword=%E5%88%98%E5%BE%B7%E5%8D%8E&keytype=all&pagesize=20&pagenum=1";            // 使用Jsoup组件请求网络,并解析食物数据            Document doc = Jsoup.connect(url).userAgent(Constant.USER_AGENT).timeout(3000).get();            System.out.println("start**********doc**********doc**********doc**********");            System.out.println(doc);            System.out.println(" end **********doc**********doc**********doc**********");            Elements songTitles = doc.select("li.item.clearfix");            System.out.println("songTitles" + songTitles);            for (int i=0;i<songTitles.size();i++){                SearchResult searchResult = new SearchResult();                Elements urls = songTitles.get(i).getElementsByTag("img");                searchResult.setFoodName(urls.get(0).attr("alt")); // 食物名称 1                searchResult.setFoodPic(urls.get(0).attr("src")); // 食物图片 2                Elements urls2 = songTitles.get(i).getElementsByTag("a");                searchResult.setFoodUrl(Constant.BOHE_HOME_PAGE + urls2.get(0).attr("href")); // 食物连接 3                //searchResult.setFoodKa(songTitles.get(i).getElementsByTag("p").toString()); // 卡路里 4                // kaluli_pp 带2个p标签         kaluli_p 带1个p标签         kaluli 带0个p标签                String kaluli_pp = songTitles.get(i).getElementsByTag("p").toString(); // <p>热量：77 大卡(每100克)</p>                String kaluli_p = kaluli_pp.replace("<p>", ""); // 替换掉<p>                String kaluli = kaluli_p.replace("</p>", ""); // 替换掉</p>                searchResult.setFoodKa(kaluli); // 卡路里 4                System.out.println("MainActivity@searchResult : " + searchResult);                searchResults.add(searchResult);//把最终的所有信息,添加到集合            }            System.out.println("MainActivity@searchResults : " + searchResults);            //System.out.println("@songTitles.size() : " + searchResults.size());        } catch (IOException e) {            e.printStackTrace();            return -1;        }        return 1;    }    // onPostExecute方法用于在执行完后台任务后更新UI,显示结果    @Override    protected void onPostExecute(Integer result) {        super.onPostExecute(result);        if (result==1){            asyncResponse.onDataReceivedSuccess(searchResults);// 将结果传给回调接口中的函数        }else {            asyncResponse.onDataReceivedFailed();        }    }}

AsyncResponse.java：

package com.iwanghang.booheesearchdemo;import java.util.ArrayList;public interface AsyncResponse {    void onDataReceivedSuccess(ArrayList<SearchResult> searchResults);    void onDataReceivedFailed();}

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:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    android:orientation="vertical"    tools:context="com.iwanghang.booheesearchdemo.MainActivity">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="食物卡路里一期Demo by iwanghang" />    <ListView        android:id="@+id/listView_food"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:cacheColorHint="@android:color/transparent"        android:listSelector="@android:color/transparent"        android:overScrollMode="never"        android:scrollbars="none"        android:visibility="visible"/></LinearLayout>

item_food_list.xml：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent">    <ImageView        android:id="@+id/iv_img"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:src="@drawable/food_32px"        android:layout_marginRight="10dp" />    <LinearLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_weight="1"        android:layout_marginRight="10dp"        android:orientation="vertical">        <TextView            android:id="@+id/tv_foodName"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:textColor="#000000"            android:text="tv_foodName" />        <TextView            android:id="@+id/tv_kaLuli"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:textColor="#a6a8a8"            android:text="tv_kaLuli"/>    </LinearLayout>    <ImageView        android:id="@+id/iv_details"        android:layout_width="40dp"        android:layout_height="40dp"        android:src="@drawable/local_food_more"/></LinearLayout>

项目下载：http://download.csdn.net/detail/iwanghang/9828141

转载请注明出处：http://blog.csdn.net/iwanghang/article/details/70882420

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