android小程序之幸运菜谱

android小程序之幸运菜谱

前言：刚刚结束短短5天的android公开课程，收获不少，写下来记录一下吧！（因为学校校企公开课的缘故才偶然接触的android，所以只学了这几天，不喜勿喷）

一开始得知这公开课最后得做个项目，还是挺懵逼的，不知道整啥。后来看了看聚合数据有啥免费的api，想了想寒假家里人老是问我今天吃啥，最后就有了做这个幸运菜谱的想法。

这app长啥样，下面这样：

第一张是主界面，输入你喜欢的一个数字（1-80000），然后就会在第二个界面返回对应的菜谱，你没看错（8万道菜，我一开始用这api的时候都惊呆了！）

接下来放上接口的代码和处理相应界面的java代码：

 public class Juhedemo {   //调用接口的代码
     public static final String DEF_CHATSET = "UTF-8";
     public static final int DEF_CONN_TIMEOUT = 30000;
     public static final int DEF_READ_TIMEOUT = 30000;
     public static String userAgent =  "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.66 Safari/537.36";

     //配置您申请的KEY
     public static final String APPKEY ="这就不能告诉你了，自己申请账号吧";

     //4.按菜谱ID查看详细
     public  menubean getRequest4(String num){
         menubean mu=new menubean();
         String result =null;
         String title,ingredient,burden;
         ArrayList<String> b = new ArrayList<>();
         String url ="http://apis.juhe.cn/cook/queryid";//请求接口地址
         Map params = new HashMap();//请求参数
         params.put("id",num);//菜谱的ID
         params.put("key",APPKEY);//应用APPKEY(应用详细页查询)
         params.put("dtype","json");//返回数据的格式,xml或json，默认json
         Log.e("MyLog","====num===="+num);
         try {
             result =net(url, params, "GET");
             Log.e("MyLog","====result===="+result);
             org.json.JSONObject object = new org.json.JSONObject(result);
             if(object.getInt("error_code")==0){
                 org.json.JSONObject resultObject = object.getJSONObject("result");
                 org.json.JSONArray array = resultObject.getJSONArray("data");
                 mu.setTitle(array.getJSONObject(0).getString("title"));
                 mu.setIngredient(array.getJSONObject(0).getString("ingredients"));
                 mu.setBurden(array.getJSONObject(0).getString("burden"));
                 org.json.JSONObject o1=array.getJSONObject(0);
                 org.json.JSONArray a1=o1.getJSONArray("steps");
                 for(int i=0;i<a1.length();i++){
                    String step  =a1.getJSONObject(i).getString("step");
                    b.add(step);
                 }
                 mu.setB(b);
             }
 //            JSONObject object = JSONObject.fromObject(result);
 //            Log.e("MyLog","=====object==="+object);
 //            JSONObject ob=object.getJSONObject("result");
 //            JSONArray ob1=ob.getJSONArray("data");
 //            JSONObject o2=ob1.getJSONObject(0);
 //            JSONArray po=o2.getJSONArray("steps");
 //
 //            if(object.getInt("error_code")==0){
 //                    title=o2.getString("title");
 //                    ingredient=o2.getString("ingredients");
 //                    burden=o2.getString("burden");
 //                    for(int i=0;i<po.size();i++){
 //
 //                        JSONObject u=po.getJSONObject(i);
 //
 //                        b[i]=(u.getString("step"));
 //
 //                    }
 //                mu.setTitle(title);
 //                mu.setIngredient(ingredient);
 //                mu.setBurden(burden);
 //                mu.setB(b);
 //
 //            }else{
 //                System.out.println(object.get("error_code")+":"+object.get("reason"));
 //
 //            }

         } catch (Exception e) {
             e.printStackTrace();
             Log.e("MyLog","====+error_code===="+e.getMessage());
         }
         return mu;
     }

     /**
      *
      * @param strUrl 请求地址
      * @param params 请求参数
      * @param method 请求方法
      * @return  网络请求字符串
      * @throws Exception
      */
     public static String net(String strUrl, Map params,String method) throws Exception {
         HttpURLConnection conn = null;
         BufferedReader reader = null;
         String rs = null;
         try {
             StringBuffer sb = new StringBuffer();
             if(method==null || method.equals("GET")){
                 strUrl = strUrl+"?"+urlencode(params);
             }
             Log.e("MyLog","----url------"+strUrl);
             URL url = new URL(strUrl);
             conn = (HttpURLConnection) url.openConnection();
             if(method==null || method.equals("GET")){
                 conn.setRequestMethod("GET");
             }else{
                 conn.setRequestMethod("POST");
                 conn.setDoOutput(true);
             }
             conn.setRequestProperty("User-agent", userAgent);
             conn.setUseCaches(false);
             conn.setConnectTimeout(DEF_CONN_TIMEOUT);
             conn.setReadTimeout(DEF_READ_TIMEOUT);
             conn.setInstanceFollowRedirects(false);
             conn.connect();
             if (params!= null && method.equals("POST")) {
                 try {
                     DataOutputStream out = new DataOutputStream(conn.getOutputStream());
                     out.writeBytes(urlencode(params));
                 } catch (Exception e) {
                     Log.e("MyLog","---- e------"+ e.getMessage());
                 }
             }
             InputStream is = conn.getInputStream();
             rs = read(is);
 //            reader = new BufferedReader(new InputStreamReader(is));
 //            String strRead = null;
 //            while ((strRead = reader.readLine()) != null) {
 //                sb.append(strRead);
 //            }
 //            rs = sb.toString();
             Log.e("MyLog","----rs------"+rs);
         } catch (IOException e) {
             Log.e("MyLog","----e------"+e.getMessage());
             e.printStackTrace();
         } finally {
             if (reader != null) {
                 reader.close();
             }
             if (conn != null) {
                 conn.disconnect();
             }
         }
         return rs;
     }

     private static String read(InputStream is) throws IOException {
         StringBuilder builder = new StringBuilder();
         int byteCount = 0;
         byte[] bytes = new byte[1024];
         while ((byteCount = is.read(bytes)) != -1) {
             String text = new String(bytes,0,byteCount);
             Log.e("MyLog","----=======------"+ text);
             builder.append(text);
         }
         Log.e("MyLog","----???????????------"+ builder.toString());
         return builder.toString();
     }

     //将map型转为请求参数型
     public static String urlencode(Map<String,Object>data) {
         StringBuilder sb = new StringBuilder();
         for (Map.Entry i : data.entrySet()) {
             try {
                 sb.append(i.getKey()).append("=").append(URLEncoder.encode(i.getValue()+"","UTF-8")).append("&");
             } catch (UnsupportedEncodingException e) {
                 e.printStackTrace();
             }
         }
         return sb.toString();
     }
 }

这一部分当初遇到的问题是：我最初是用eclipse上调用接口测试的，一点问题都没有。后来把那部分代码放回到AS中就出问题了，总是数据获取不全，后来把json解析文件改了，就好了（上面注释部分就是之前的JSon解析代码）

 public class MainActivity extends AppCompatActivity {   //主界面
 private EditText med;
 private Button mb;
     private List<Food> foodlist = new ArrayList<>();

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         initFoods();
         FoodAdapter adapter = new FoodAdapter(MainActivity.this,R.layout.food,foodlist);
         med=findViewById(R.id.edit_text);
         mb=findViewById(R.id.button);
         mb.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 String num=med.getText().toString();
                 Intent in=new Intent(MainActivity.this,DetailActivity.class);
                 in.putExtra("med",num);
                 startActivity(in);
             }
         });
         EditText editText = (EditText) findViewById(R.id.edit_text);

         ListView listView = (ListView) findViewById(R.id.list_view);
         listView.setAdapter(adapter);
     }
     private  void initFoods(){
         Food a = new Food(R.drawable.food1);
         foodlist.add(a);
         Food b= new Food(R.drawable.food2);
         foodlist.add(b);
         Food c= new Food(R.drawable.food3);
         foodlist.add(c);

     }
 }

---

public class DetailActivity extends AppCompatActivity {  //显示界面
    private TextView tv,tv2,tv3,tv4;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_detail);
        tv=findViewById(R.id.tvTitle);
        tv2=findViewById(R.id.tvIngredients);
        tv3=findViewById(R.id.tvBunder);
        tv4=findViewById(R.id.tvSteps);
        Intent f= getIntent();
        String ji=f.getStringExtra("med");
        new NetworkTask().execute(ji);

    }

    private class NetworkTask extends AsyncTask<String,Void,menubean>{
        @Override
        protected menubean doInBackground(String... ji) {

            Juhedemo nu2=new Juhedemo();
            menubean kk=nu2.getRequest4(ji[0]);
            Log.e("MyLog","========"+kk);
//            String title2=kk.getTitle();
            return kk;
        }

        @Override
        protected void onPostExecute(menubean kk) {
            ArrayList<String> ad=new ArrayList<String>();
            String dg="";
            ad=kk.getB();
            for(int i=0;i<ad.size();i++){
                dg=dg+ad.get(i);
            }

            super.onPostExecute(kk);
            tv.setText(kk.getTitle());
            tv2.setText(kk.getIngredient());
            tv3.setText(kk.getBurden());
            tv4.setText(dg);
        }
    }
}

这就告一段落，接下来继续努力吧！（想知道自己幸运数字对应的是什么菜就给我留言，留下一个数字，我给你一道菜）