Raterofil尝试调用界面方法在空对象上调用

Question

我正在尝试使用Android改造通过HTTP获取JSON数据，我会收到以下错误：

尝试调用接口方法'retrofit2.call com.webdealer.otexconnect.goldback.network.loginservices.sendsms(java.lang.string('null对象参考

这是我的课程。

客户端

package com.webdealer.otexconnect.goldback.network;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
/**
 * Created by fazal on 3/13/18.
 */
public class RetrofitClient {
    private static Retrofit retrofit = null;
    public static Retrofit getClient(String baseUrl) {
        if (retrofit==null) {
            retrofit = new Retrofit.Builder()
                    .baseUrl(baseUrl)
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();
        }
        return retrofit;
    }
    public void getServies(){
       // return RetrofitClient.getClient(BASE_URL).create(LoginServices.class);
    }
}

接口：

package com.webdealer.otexconnect.goldback.network;
import com.webdealer.otexconnect.goldback.utils.Login;
import com.webdealer.otexconnect.goldback.utils.Sms;
import org.json.JSONObject;
import retrofit2.Call;
import retrofit2.http.Field;
import retrofit2.http.FormUrlEncoded;
import retrofit2.http.GET;
import retrofit2.http.POST;
import retrofit2.http.Part;
import retrofit2.http.Path;
/**
 * Created by fazal on 3/13/18.
 */
public interface LoginServices {
    @FormUrlEncoded
    @POST("login")
    Call<Login> login(@Field("email") String email, @Field("password") String password);
    @FormUrlEncoded
    @POST("register-customer")
    Call<JSONObject> signUp(@Field("name") String name,@Field("email") String email,@Field("phone_number") String phoneNumber, @Field("password") String password);@FormUrlEncoded
    @POST("register-driver")
    Call<JSONObject> signUpDriver(@Field("name") String name,@Field("email") String email,@Field("phone_number") String phoneNumber, @Field("password") String password);
    @FormUrlEncoded
    @POST("send-sms-code")
    Call<Sms> sendSMS (@Field("phone_number") String phone_number);

}

模型：

package com.webdealer.otexconnect.goldback.utils;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
public class Sms {
    @SerializedName("status")
    @Expose
    private Boolean status;
    @SerializedName("fourDigitCode")
    @Expose
    private String fourDigitCode;
    public Boolean getStatus() {
        return status;
    }
    public void setStatus(Boolean status) {
        this.status = status;
    }
    public String getFourDigitCode() {
        return fourDigitCode;
    }
    public void setFourDigitCode(String fourDigitCode) {
        this.fourDigitCode = fourDigitCode;
    }
}

try {
                    mLoginServices.sendSMS("[phone]").enqueue(new Callback<Sms>(){
                        @Override
                        public void onResponse(Call<Sms> call, Response<Sms> response) {
                            Toast.makeText(getApplicationContext(), mPhone, Toast.LENGTH_SHORT).show();
                        }
                        @Override
                        public void onFailure(Call<Sms> call, Throwable t) {
                            Toast.makeText(getApplicationContext(),"Failed",Toast.LENGTH_LONG).show();
                        }
                    });
                }catch (Exception ex){
                    Log.e("Error sms",ex.getMessage());
                }

Answer 1

您需要创建您的实现：

public class RetrofitClient {
    private static LoginServices apiService;
    public RetrofitClient(String baseUrl) {
           Retrofit retrofit = new Retrofit.Builder()
                    .baseUrl(baseUrl)
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();
         apiService = retrofit.create(LoginServices.class);
    }
    public LoginServices getServies(){
        return apiService;
    }
}

现在，当您调用服务时，您只需要做：

RetrofitClient client = new RetrofitClient(BASE_URL);
client.getServies().sendSMS("[phone]").enqueue(new Callback<Sms>(){
                        @Override
                        public void onResponse(Call<Sms> call, Response<Sms> response) {
                            Toast.makeText(getApplicationContext(), mPhone, Toast.LENGTH_SHORT).show();
                        }
                        @Override
                        public void onFailure(Call<Sms> call, Throwable t) {
                            Toast.makeText(getApplicationContext(),"Failed",Toast.LENGTH_LONG).show();
                        }
                    });