问当不正确的数据输入时，升级到onFailure

EN

public interface SignInService {
    @FormUrlEncoded
    @POST("api/signIn/")
    Call<SignInRespone> signIn(@Field("email") String email,
                               @Field("password") String password);

}

public class SignInRespone {
    @SerializedName("success")
    private boolean success;
    @SerializedName("message")
    private String message;
    @SerializedName("data")
    private Data data;

    public boolean getSuccess() {
        return success;
    }

    public void setSuccess(boolean success) {
        this.success = success;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public Data getData() {
        return data;
    }

    public void setData(Data data) {
        this.data = data;
    }

    public static class Data {
        @SerializedName("id")
        private int id;
        @SerializedName("username")
        private String username;
        @SerializedName("email")
        private String email;

        public int getId() {
            return id;
        }

        public void setId(int id) {
            this.id = id;
        }

        public String getUsername() {
            return username;
        }

        public void setUsername(String username) {
            this.username = username;
        }

        public String getEmail() {
            return email;
        }

        public void setEmail(String email) {
            this.email = email;
        }
    }
}

public class SignInRequest {
    @SerializedName("email")
    private String email;
    @SerializedName("password")
    private String password;

    public SignInRequest(String email, String password) {
        this.email = email;
        this.password = password;
    }
}

public void signIn(){
        signInService = ServiceGenerator.createService(SignInService.class);
        Call<SignInRespone> call= signInService.signIn("jonh1@gmail.com","12345");
        call.enqueue(new Callback<SignInRespone>() {
            @Override
            public void onResponse(Call<SignInRespone> call, Response<SignInRespone> response) {
                Log.e(">>>>",response.body().getData().getEmail());
                startActivity(new Intent(getApplicationContext(), MainActivity.class));
                finish();
            }

            @Override
            public void onFailure(Call<SignInRespone> call, Throwable t) {
                Log.e(">>>>", t.toString());
            }
        });
    }