API網路請求

對於之前寫的2篇關於API的內容和JSON文字解析類，當然需要有著配套的網路請求配合安卓端請求和獲取資料，這篇部落格介紹與後臺通訊中網路的基本請求與API資料有關

• 準備

  這裡我們使用現在封裝得比較好的包：okhttp
  在配置檔案中加入依賴：

  compile 'com.squareup.okhttp3:okhttp:3.4.1'

  如圖：

  

• 程式碼編寫

  首先很重要的一點：Android網路請求因為有延遲，必須要在多執行緒中進行

  先看一個整個的請求程式碼：

                  final String address  =  "http://route.showapi.com/268-1?showapi_appid=42305&keyword="
   
  + searchWord +"&proId=&cityId=&areaId=&page=&showapi_sign=c069130238404775894ba39caf3ac094";
                  mView = new CatLoadingView();
                  mView.show(getSupportFragmentManager(), "");
                  new Thread(new Runnable() {
                      @Override
                      public
   
   void run() {
                          try {
                              OkHttpClient client = new OkHttpClient();
                              Request request = new Request.Builder()
                                      .url(address)
                                      .build();
                              Response
   
   response = client.newCall(request).execute();
                              responseData = response.body().string();
  
                              Message message = new Message();
                              message.what = UPDATE_TEXT;
                              mHandler.sendEmptyMessage(message.what);
  
                          } catch (IOException e) {
                              e.printStackTrace();
                          }
                      }
                  }).start();
  
              }
  

  可以看到：

  這裡的responseData就是網路請求返回的結果，接下來可以對這個結果進行一個JSON文字的解析

  同時可以看到：

  Message message = new Message();
  message.what = UPDATE_TEXT;
  mHandler.sendEmptyMessage(message.what);

  這是一個非同步訊息處理機制，剛才有說到，網路請求在子執行緒完成，如果想要做到在主執行緒做出一些修改UI的操作，就需要這個非同步訊息處理

  上面程式碼是訊息的發出，我們看一下訊息的獲取和相關操作：

  protected Handler mHandler =  new Handler(){
          @Override
          public void handleMessage(Message msg) {
              switch (msg.what){
                  case UPDATE_TEXT:
                      Log.e("responseData----",""+responseData);
                      Gson gs = new Gson();
  
                      entity= gs.fromJson(responseData,entityClass);
                      String code= entity.getShowapi_res_code();
                      SearchBodyEntity showapi_res_body = entity.getShowapi_res_body();
                      String retCode = showapi_res_body.getRet_code();
                      SearchBeanEntity pagebean = showapi_res_body.getPagebean();
                      Log.e("pagebean----",""+pagebean);
                      Log.e("pagebeangetAllPages----",""+pagebean.getAllPages());
                      Log.e("getContentList----",""+pagebean.getContentlist());
  
                      List<SearchListEntity> contentList = pagebean.getContentlist();
                      if (contentList.size() != 0) {
                          Log.e("contentList----", "" + contentList);
                          SearchListEntity[] contentlist_objects = new SearchListEntity[contentList.size()];
                          location[] locations = new location[contentList.size()];
                          String[] lons = new String[contentList.size()];
                          String[] lats = new String[contentList.size()];
                          String[] names = new String[contentList.size()];
                          String[] summarys = new String[contentList.size()];
                          String[] contents = new String[contentList.size()];
                          String[] attentions = new String[contentList.size()];
                          String[] opentimes = new String[contentList.size()];
                          String[] coupons = new String[contentList.size()];
                          String[] my_addresss = new String[contentList.size()];
                          String[] picture = new String[contentList.size()];
                          for (int i = 0; i < contentList.size(); i++) {
                              SearchListEntity contentlist_object = contentList.get(i);
                              contentlist_objects[i] = contentlist_object;
                              location location = contentlist_object.getLocation();
                              locations[i] = location;
                              String lon = location.getLon();
                              lons[i] = lon;
                              String lat = location.getLat();
                              lats[i] = lat;
                              String name = contentlist_object.getName();
                              names[i] = name;
                              String summary = contentlist_object.getSummary();
                              summarys[i] = summary;
                              String content = contentlist_object.getContent();
                              contents[i] = content;
                              String attention = contentlist_object.getAttention();
                              attentions[i] = attention;
                              String opentime = contentlist_object.getOpentime();
                              opentimes[i] = opentime;
                              String coupon = contentlist_object.getCoupon();
                              coupons[i] = coupon;
                              String my_address = contentlist_object.getAddress();
                              my_addresss[i] = my_address;
                              List<picList> picList = contentlist_object.getPicList();
                              picture[i] = picList.get(0).getPicUrl();
                              Log.e("", "" + picture[i]);
                          }
  
                          Intent intent = new Intent(SearchActivity.this, SearchDetailActivity.class);
                          intent.putExtra("name", names);
                          intent.putExtra("summary", summarys);
                          intent.putExtra("my_address", my_addresss);
                          intent.putExtra("opentime", opentimes);
                          intent.putExtra("picture", picture);
                          intent.putExtra("coupon", coupons);
                          intent.putExtra("attention", attentions);
                          intent.putExtra("content", contents);
                          intent.putExtra("lon", lons);
                          intent.putExtra("lat", lats);
                          mView.dismiss();
                          startActivity(intent);
                      }else {
                          Toast.makeText(SearchActivity.this,"查無結果",Toast.LENGTH_LONG).show();
                      }
                      break;
              }
          }
      };

  這裡對之前發出的訊息做的一個處理，包含介面之間的跳轉、JSON文字解析的操作

以上就是API資料獲取的部分內容，應該算是與後臺通訊最基本的內容