改造POST向服务器发送错误的值

Question

我使用Retrofit2向服务器发送10个值。我发送的值应该是（根据记录）：
getRecommendations 值：

document.body.style.color = 'black'; document.body.style['background-color'] = 'white';

但是，当我通过改造将值发送到服务器（到PHP脚本）时，它们将作为
发送 -1, -1, -1, -1, -1, -1, 3, 25, 44.182345, 7.1627383.。
我知道这是因为我在Android Studio中使用了PHP拦截器。以下是PHP拦截器显示的内容： -1, -1 ,0 ,-1 ,-1 ,0 ,25 ,44.182345 , 7.1627383

我很困惑为什么会这样 - 有些值只是随机改变了，下面我附上了我的代码部分。

getRecommendations（） - 将数据发送到服务器

maxGradientLo=-1&maxGradientHi=-1&totalDistanceLo=0&totalDistanceHi=-1&altitudeGainLo=-1&altitudeGainHi=-1&numberToRecommend=0&searchWithin=25&currentLatitude=44.182345&currentLongitude=7.1627349853515625

Retrofit界面中方法的定义

private List<RecommendationJsonResponse> jsonResponse = null;

private void getRecommendations(int maxGradientLo, int maxGradientHi, int totalDistanceLo, int totalDistanceHi, int altitudeGainLo, int altitudeGainHi, int numberToRecommend, int searchWithin, double currentLatitude, double currentLongitude){

        Log.d(Constants.SkiCompanionDebug, "getRecommendations values: " + maxGradientLo + ", "+ maxGradientHi + ", "+ totalDistanceLo + ", "+ totalDistanceHi + ", "+ altitudeGainLo + ", "+ altitudeGainHi + ", "+ numberToRecommend + ", "+ searchWithin);

        RetrofitApiInterface retrofitApiInterface = RetrofitApiClient.getApiClient().create(RetrofitApiInterface.class);

        Call<List<RecommendationJsonResponse>> callRecommendations = retrofitApiInterface.downloadRecommendations(maxGradientLo,  maxGradientHi, totalDistanceLo, totalDistanceHi, altitudeGainLo, altitudeGainHi, numberToRecommend, searchWithin, currentLatitude, currentLongitude);
        callRecommendations.enqueue(new Callback<List<RecommendationJsonResponse>>() {
            @Override
            public void onResponse(Call<List<RecommendationJsonResponse>> call, Response<List<RecommendationJsonResponse>> response) {
                jsonResponse = response.body();

                //calling helper functions to populate map with ski tracks
                List<List<GeoPoint>> trackList = new ArrayList<>();

                trackList = populateGeoPointLists();
                populateMap(trackList);


            }

            @Override
            public void onFailure(Call<List<RecommendationJsonResponse>> call, Throwable t) {
                Log.d(Constants.SkiCompanionDebug, "onFailure: downloadRecommendations: " + t.getMessage());
            }
        });
    }

调用getRecommendations（）

@POST("download_recommendations.php")
    @FormUrlEncoded
    Call<List<RecommendationJsonResponse>> downloadRecommendations(@Field("maxGradientLo") int maxGradientLo,
                                         @Field("maxGradientHi") int maxGradientHi,
                                         @Field("totalDistanceLo") int totalDistanceLo,
                                         @Field("totalDistanceHi") int totalDistanceHi,
                                         @Field("altitudeGainLo") int altitudeGainLo,
                                         @Field("altitudeGainHi") int altitudeGainHi,
                                         @Field("numberToRecommend") int numberToRecommend,
                                         @Field("searchWithin") int searchWithin,
                                         @Field("currentLatitude") double currentLatitude,
                                         @Field("currentLongitude") double currentLongitude);

发布值的PHP脚本 - 注意当我回显时，值是错误的，与PHP拦截器给出的值相同

final int[] gradient = new int[2];
final int[] distance = new int[2];
final int[] altitude = new int[2];
final int[] recommendNumber = new int[1];
final int[] searchWithin = new int[1];

//initializing variables
gradient[0] = -1;
gradient[1] = -1;
distance[0] = -1;
distance[1] = -1;
altitude[0] = -1;
altitude[1] = -1;
recommendNumber[0] = 3;
searchWithin[0] = 25;

getRecommendations(gradient[0], gradient[1], distance[0], distance[1], altitude[0], altitude[1], recommendNumber[0], searchWithin[0], 44.182345, 7.1627383);

从OkHttp拦截器中提取

$maxGradientLo = $_POST["maxGradientLo"]; //degrees
$maxGradientHi = $_POST["maxGradientHi"];
$totalDistanceLo = $_POST["totalDistanceLo"]; //kilometers
$totalDistanceHi = $_POST["totalDistanceHi"];
$altitudeGainLo = $_POST["altitudeGainLo"]; //meters
$altitudeGainHi = $_POST["altitudeGainHi"];
$numberToRecommend = $_POST["numberToRecommend"];
$searchWithin = $_POST["searchWithin"]; //number of kilometers track can be from user
$currentLatitude = $_POST["currentLatitude"]; 
$currentLongitude = $_POST["currentLongitude"];

// echo "gradLo: " .$maxGradientLo ." gradHi: " .$maxGradientHi." distLo: " .$totalDistanceLo." distHi: " .$totalDistanceHi." altLo: " .$altitudeGainLo." altHi: " .$altitudeGainHi. " numTorecommend: ".$numberToRecommend;

额外的POJO类

02-22 17:12:31.967 25165-25426/skicompanion.skicompanion D/OkHttp: --> POST http://192.168.1.11/ski_companion/download_recommendations.php
02-22 17:12:31.967 25165-25426/skicompanion.skicompanion D/OkHttp: Content-Type: application/x-www-form-urlencoded
02-22 17:12:31.970 25165-25426/skicompanion.skicompanion D/OkHttp: Content-Length: 204
02-22 17:12:31.971 25165-25426/skicompanion.skicompanion D/OkHttp: maxGradientLo=-1&maxGradientHi=-1&totalDistanceLo=0&totalDistanceHi=-1&altitudeGainLo=-1&altitudeGainHi=-1&numberToRecommend=0&searchWithin=25&currentLatitude=44.182345&currentLongitude=7.1627349853515625
02-22 17:12:31.972 25165-25426/skicompanion.skicompanion D/OkHttp: --> END POST (204-byte body)
02-22 17:12:32.212 25165-25426/skicompanion.skicompanion D/OkHttp: <-- 200 OK http://192.168.1.11/ski_companion/download_recommendations.php (239ms)
02-22 17:12:32.212 25165-25426/skicompanion.skicompanion D/OkHttp: Date: Thu, 22 Feb 2018 17:12:33 GMT
02-22 17:12:32.212 25165-25426/skicompanion.skicompanion D/OkHttp: Server: Apache/2.4.29 (Win32) OpenSSL/1.1.0g PHP/7.2.1
02-22 17:12:32.213 25165-25426/skicompanion.skicompanion D/OkHttp: X-Powered-By: PHP/7.2.1
02-22 17:12:32.213 25165-25426/skicompanion.skicompanion D/OkHttp: Keep-Alive: timeout=5, max=100
02-22 17:12:32.213 25165-25426/skicompanion.skicompanion D/OkHttp: Connection: Keep-Alive
02-22 17:12:32.213 25165-25426/skicompanion.skicompanion D/OkHttp: Transfer-Encoding: chunked
02-22 17:12:32.213 25165-25426/skicompanion.skicompanion D/OkHttp: Content-Type: text/html; charset=UTF-8
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Answer 1

答案

这是一个非常恼人的问题，我不完全理解这个解决方案。如果有人能解释为什么我不能静态调用这个方法 - 我会非常感激。它告诉我如何调用RetrofitApiClient：我静态调用了getApiClient（），但我通过创建一个新的RetrofitApiClient对象然后在其上调用getApiClient（）来修复它。解决方案如下：

旧破代码：

RetrofitApiInterface retrofitApiInterface = RetrofitApiClient.getApiClient().create(RetrofitApiInterface.class);

新工作代码：

获取RetrofitApiClient

的实例

RetrofitApiClient retrofitApiClient = RetrofitApiClient.getInstance();
        RetrofitApiInterface retrofitApiInterface = retrofitApiClient.getApiClient().create(RetrofitApiInterface.class);

在RetrofitApiClient类

中创建实例

private static Retrofit retrofit = null;

    public static RetrofitApiClient instance = null;

    public static RetrofitApiClient getInstance(){
        if(instance == null){
            instance = new RetrofitApiClient();
        }

        return instance;
    }

Answer 2

为了实现Retrofit实例的单例设计模式，请参阅以下代码：

public class ApiClient extends Application {

    private static ApiClient apiClient = null; //singleton Object
    String apiURL = "http://your.url/";


    public static ApiClient getApiClient() {//getter for object
        if (apiClient == null)
            apiClient = new ApiClient();
        return apiClient;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Stetho.initializeWithDefaults(this);
    }

    public Retrofit getClient() {//Retrofit instance
        int myTime = 15;
        OkHttpClient.Builder okHttpBuilder = new OkHttpClient.Builder()
                .connectTimeout(myTime, TimeUnit.SECONDS)
                .readTimeout(myTime, TimeUnit.SECONDS)
                .writeTimeout(myTime, TimeUnit.SECONDS)
                .addNetworkInterceptor(new StethoInterceptor());

        Retrofit.Builder builder = new Retrofit.Builder()
                .baseUrl(apiURL)
                .client(okHttpBuilder.build())
                .addConverterFactory(GsonConverterFactory.create());
        return builder.build();
    }
}

现在使用改造请参阅以下代码：

LoginDTO loginDTO = new LoginDTO(
            etPhno.getText().toString().trim(),
            etPass.getText().toString().trim()
    );

ApiService service = ApiClient.getApiClient().getClient().create(ApiService.class);
Call<LoginResp> call = service.loginAPI(loginDTO);
call.enqueue(new Callback<LoginResp>() {

    @Override
    public void onResponse(Call<LoginResp> call, Response<LoginResp> response) {

        LoginResp loginResp = response.body();

    }

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

        Toast.makeText(Login.this, "Error here", Toast.LENGTH_SHORT).show();
    }
});

在ApiService接口中声明如下函数：

    @POST("login")
    Call<LoginResp> loginAPI(@Body LoginDTO loginDTO);

LoginDTO类是这样的：

public class LoginDTO {
    @SerializedName("log_phno")
    @Expose
    private String user;

    @SerializedName("log_pass")
    @Expose
    private String pass;

    public LoginDTO(String user, String pass) {
        this.user = user;
        this.pass = pass;
    }

    public String getUser() {
        return user;
    }

    public String getPass() {
        return pass;
    }
}

现在最重要的部分，转到清单文件，在<application>标记下，将您的单例类名称前面加一个点（。），如下所示：

android:name=".Controller.ApiClient"

了解Stetho Interceptor的魔力，运行你的应用并打开谷歌浏览器并输入chrome://inspect/