如何在同一片段中创建多个 Retrofit 回调 - android

Question

我正在尝试在片段中实现多个按钮，每个按钮都需要从网络获取一些数据 api。

我已经为一个按钮创建了改装回调。现在我在创建另一个按钮以从另一个 api.

获取数据时遇到了一些麻烦

这是我的界面：

public interface APIService {

        @GET("/api/partners.json")
        Call<List<Partner>> getPartners();

        @GET("/api/drivers.json")
        Call<List<Driver>> getDrivers();

        @GET("/api/warehouses.json")
        Call<List<Warehouse>> getWarehuses();
}

这是我的 api 帮手 class:

public class APIHelper {

    public static final String BASE_URL = "https://part-of-url.herokuapp.com/";

    public static APIService apiService;

    public static APIService getApiService() {
        if (apiService == null) {
            Retrofit retrofit = new Retrofit.Builder().baseUrl(BASE_URL)
                    .addConverterFactory(GsonConverterFactory.create()).build();
            apiService = retrofit.create(APIService.class);
        }
        return apiService;
    }
}

这是我的驱动pojo模型（所有pojo模型都差不多）

public class Driver {

    @Expose
    private List<String> driver_name = new ArrayList<String>();

    public List<String> getDriver_name() { return driver_name; }

    public void setDriver_name(List<String> driver_name) { this.driver_name = driver_name; }
}

这是我的片段，我在其中获得了合作伙伴的回调，需要实现另一个按钮来获取驱动程序和第三个按钮来获取一些存储空间。

public class DownloadMain extends Fragment implements Callback<Partner> {

    private static final String TAG = DownloadMain.class.getSimpleName();

    private Button dloadPartners, takeDrivers, takeWarehouses, takeUsers, takeLogs;
    private Call callPartners;

    public DownloadMain() {}

    public DownloadMain newInstance() { return new DownloadMain(); }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.download_main, container, false);

        dloadPartners = (Button) view.findViewById(R.id.downloadPartners);
        takeDrivers = (Button) view.findViewById(R.id.btnDrivers);
        dloadPartners.setOnClickListener(btnListener);
        takeDrivers.setOnClickListener(btnDrivers);

        callPartners = APIHelper.getApiService().getPartners();

        return view;
    }

    Button.OnClickListener btnListener = (new Button.OnClickListener() {
        @Override
        public void onClick(View v) {
            callPartners.clone().enqueue(DownloadMain.this);
            checkIfDataIsInTable();
        }
    });
 @Override
    public void onResponse(Call call, Response response) {

        if(response.body() == null) {
            try {
                response.errorBody().string();
            } catch (IOException e) {
                e.printStackTrace();
            }
            Toast.makeText(getActivity(), "No Partners!", Toast.LENGTH_SHORT).show();
        } else {
            ArrayList<String> partners = (ArrayList<String>) response.body();

            ActiveAndroid.beginTransaction();
            try {
                for (int i = 0; i < partners.size() ; i++) {
                    Partners partner = new  Partners();
                    partner.name = String.valueOf(partners);
                    partner.save();
                    Log.d("partner_ ", String.valueOf(response.body()));
                }
                ActiveAndroid.setTransactionSuccessful();
            } finally {
                ActiveAndroid.endTransaction();
            }

            Log.d(TAG, "Number of partners received: " + partners.size());
            Toast.makeText(getActivity(), "Partners downloaded!", Toast.LENGTH_SHORT).show();
        }

    }

    @Override
    public void onFailure(Call call, Throwable t) {

    }
}

现在我无法实现第二个按钮以从 api 获取数据。

如果有人可以帮助我 实现第二个按钮以从 api 获取驱动程序，我将不胜感激？！

Answer 1

您可以使用 Base 模型来执行此操作，例如：

@GET("mypath") 
Call<MyBaseModel<List<MyModel>>> getData();

在片段中实现回调为

Callback<MyBaseModel<List<?>>>

MyBaseModel 的一个例子是：

public class MyBaseModel<Data> {
  private String page;
  private Data[] results;

  public String getPage() {
     return page;
  }

  public Data[] getResults() {
     return results;
  }
}

onResponse 应该 return:

 Callback<MyBaseModel<?>>

然后使用 'instanceOf'

检查结果是否是您的模型的实例

Answer 2

使用 retrofit2，您可以将 onResponse 和 onFailure 与 call.enqueue 内联，这让您可以在同一个 activity 中拥有多个调用类型，因为它们被封装在 call.enqueue( )

// the following can be in the same activity
Call<YourPOJO1> call1 = client.callName1(params);
call1.enqueue(new Callback<YourPOJO1>() {
        @Override
        public void onResponse(Call<YourPOJO1> call, Response<YourPOJO1> response) {
            Log.d(TAG, "Call1 Succeeded");
            int code = response.code();
            if (code == 200) {
       // your parsing of POJO1 here
            } else {
                Log.d(TAG, "Error Happened");
            }
        }

        @Override
        public void onFailure(Call<YourPOJO1> call, Throwable t) {
            Log.d(TAG, "Call1 Failed");
        }
    });


Call<YourPOJO2> call2 = client.callName2(params);
call2.enqueue(new Callback<YourPOJO2>() {
        @Override
        public void onResponse(Call<YourPOJO2> call, Response<YourPOJO2> response) {
            Log.d(TAG, "Call2 Succeeded");
            int code = response.code();
            if (code == 200) {
       // your parsing of POJO2 here
            } else {
                Log.d(TAG, "Error Happened");
            }
        }

        @Override
        public void onFailure(Call<YourPOJO2> call, Throwable t) {
            Log.d(TAG, "Call2 Failed");
        }
    });

如何在同一片段中创建多个 Retrofit 回调 - android

How to create multiple Retrofit callbacks in same fragment - android

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