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：
1 public class Juhedemo { //调用接口的代码 2 public static final String DEF_CHATSET = "UTF-8"; 3 public static final int DEF_CONN_TIMEOUT = 30000; 4 public static final int DEF_READ_TIMEOUT = 30000; 5 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"; 6 7 //配置您申请的KEY 8 public static final String APPKEY ="这就不能告诉你了，自己申请账号吧"; 9 10 //4.按菜谱ID查看详细 11 public menubean getRequest4(String num){ 12 menubean mu=new menubean(); 13 String result =null; 14 String title,ingredient,burden; 15 ArrayList<String> b = new ArrayList<>(); 16 String url ="http://apis.juhe.cn/cook/queryid";//请求接口地址 17 Map params = new HashMap();//请求参数 18 params.put("id",num);//菜谱的ID 19 params.put("key",APPKEY);//应用APPKEY(应用详细页查询) 20 params.put("dtype","json");//返回数据的格式,xml或json，默认json 21 Log.e("MyLog","====num===="+num); 22 try { 23 result =net(url, params, "GET"); 24 Log.e("MyLog","====result===="+result); 25 org.json.JSONObject object = new org.json.JSONObject(result); 26 if(object.getInt("error_code")==0){ 27 org.json.JSONObject resultObject = object.getJSONObject("result"); 28 org.json.JSONArray array = resultObject.getJSONArray("data"); 29 mu.setTitle(array.getJSONObject(0).getString("title")); 30 mu.setIngredient(array.getJSONObject(0).getString("ingredients")); 31 mu.setBurden(array.getJSONObject(0).getString("burden")); 32 org.json.JSONObject o1=array.getJSONObject(0); 33 org.json.JSONArray a1=o1.getJSONArray("steps"); 34 for(int i=0;i<a1.length();i++){ 35 String step =a1.getJSONObject(i).getString("step"); 36 b.add(step); 37 } 38 mu.setB(b); 39 } 40 // JSONObject object = JSONObject.fromObject(result); 41 // Log.e("MyLog","=====object==="+object); 42 // JSONObject ob=object.getJSONObject("result"); 43 // JSONArray ob1=ob.getJSONArray("data"); 44 // JSONObject o2=ob1.getJSONObject(0); 45 // JSONArray po=o2.getJSONArray("steps"); 46 // 47 // if(object.getInt("error_code")==0){ 48 // title=o2.getString("title"); 49 // ingredient=o2.getString("ingredients"); 50 // burden=o2.getString("burden"); 51 // for(int i=0;i<po.size();i++){ 52 // 53 // JSONObject u=po.getJSONObject(i); 54 // 55 // b[i]=(u.getString("step")); 56 // 57 // } 58 // mu.setTitle(title); 59 // mu.setIngredient(ingredient); 60 // mu.setBurden(burden); 61 // mu.setB(b); 62 // 63 // }else{ 64 // System.out.println(object.get("error_code")+":"+object.get("reason")); 65 // 66 // } 67 68 } catch (Exception e) { 69 e.printStackTrace(); 70 Log.e("MyLog","====+error_code===="+e.getMessage()); 71 } 72 return mu; 73 } 74 75 /** 76 * 77 * @param strUrl 请求地址 78 * @param params 请求参数 79 * @param method 请求方法 80 * @return 网络请求字符串 81 * @throws Exception 82 */ 83 public static String net(String strUrl, Map params,String method) throws Exception { 84 HttpURLConnection conn = null; 85 BufferedReader reader = null; 86 String rs = null; 87 try { 88 StringBuffer sb = new StringBuffer(); 89 if(method==null || method.equals("GET")){ 90 strUrl = strUrl+"?"+urlencode(params); 91 } 92 Log.e("MyLog","----url------"+strUrl); 93 URL url = new URL(strUrl); 94 conn = (HttpURLConnection) url.openConnection(); 95 if(method==null || method.equals("GET")){ 96 conn.setRequestMethod("GET"); 97 }else{ 98 conn.setRequestMethod("POST"); 99 conn.setDoOutput(true); 100 } 101 conn.setRequestProperty("User-agent", userAgent); 102 conn.setUseCaches(false); 103 conn.setConnectTimeout(DEF_CONN_TIMEOUT); 104 conn.setReadTimeout(DEF_READ_TIMEOUT); 105 conn.setInstanceFollowRedirects(false); 106 conn.connect(); 107 if (params!= null && method.equals("POST")) { 108 try { 109 DataOutputStream out = new DataOutputStream(conn.getOutputStream()); 110 out.writeBytes(urlencode(params)); 111 } catch (Exception e) { 112 Log.e("MyLog","---- e------"+ e.getMessage()); 113 } 114 } 115 InputStream is = conn.getInputStream(); 116 rs = read(is); 117 // reader = new BufferedReader(new InputStreamReader(is)); 118 // String strRead = null; 119 // while ((strRead = reader.readLine()) != null) { 120 // sb.append(strRead); 121 // } 122 // rs = sb.toString(); 123 Log.e("MyLog","----rs------"+rs); 124 } catch (IOException e) { 125 Log.e("MyLog","----e------"+e.getMessage()); 126 e.printStackTrace(); 127 } finally { 128 if (reader != null) { 129 reader.close(); 130 } 131 if (conn != null) { 132 conn.disconnect(); 133 } 134 } 135 return rs; 136 } 137 138 private static String read(InputStream is) throws IOException { 139 StringBuilder builder = new StringBuilder(); 140 int byteCount = 0; 141 byte[] bytes = new byte[1024]; 142 while ((byteCount = is.read(bytes)) != -1) { 143 String text = new String(bytes,0,byteCount); 144 Log.e("MyLog","----=======------"+ text); 145 builder.append(text); 146 } 147 Log.e("MyLog","----???????????------"+ builder.toString()); 148 return builder.toString(); 149 } 150 151 //将map型转为请求参数型 152 public static String urlencode(Map<String,Object>data) { 153 StringBuilder sb = new StringBuilder(); 154 for (Map.Entry i : data.entrySet()) { 155 try { 156 sb.append(i.getKey()).append("=").append(URLEncoder.encode(i.getValue()+"","UTF-8")).append("&"); 157 } catch (UnsupportedEncodingException e) { 158 e.printStackTrace(); 159 } 160 } 161 return sb.toString(); 162 } 163 }
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）
1 public class MainActivity extends AppCompatActivity { //主界面 2 private EditText med; 3 private Button mb; 4 private List<Food> foodlist = new ArrayList<>(); 5 6 @Override 7 protected void onCreate(Bundle savedInstanceState) { 8 super.onCreate(savedInstanceState); 9 setContentView(R.layout.activity_main); 10 initFoods(); 11 FoodAdapter adapter = new FoodAdapter(MainActivity.this,R.layout.food,foodlist); 12 med=findViewById(R.id.edit_text); 13 mb=findViewById(R.id.button); 14 mb.setOnClickListener(new View.OnClickListener() { 15 @Override 16 public void onClick(View view) { 17 String num=med.getText().toString(); 18 Intent in=new Intent(MainActivity.this,DetailActivity.class); 19 in.putExtra("med",num); 20 startActivity(in); 21 } 22 }); 23 EditText editText = (EditText) findViewById(R.id.edit_text); 24 25 ListView listView = (ListView) findViewById(R.id.list_view); 26 listView.setAdapter(adapter); 27 } 28 private void initFoods(){ 29 Food a = new Food(R.drawable.food1); 30 foodlist.add(a); 31 Food b= new Food(R.drawable.food2); 32 foodlist.add(b); 33 Food c= new Food(R.drawable.food3); 34 foodlist.add(c); 35 36 } 37 }
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）
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