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）