Question

我在Android Studio中使用Retrofit 2从CUMTD api获取JSON格式的停止信息，以便通过搜索停止，并且由于某种原因连接仍然失败，查询参数和其他所有内容都是正确的，我习惯了JSON到模型类的pojo转换器所以它应该是正确的还是来自主要活动的东西？继承我正在尝试连接到https://developer.cumtd.com/api/v2.2/json/GetStopsBySearch?key=b7cd7d8c64b24b4f8415aeb57d6f7f74&query=transit%20plaza的网址我的代码：

    import java.util.List;
    import com.google.gson.annotations.Expose;
    import com.google.gson.annotations.SerializedName;

    public class Example {

        @SerializedName("changeset_id")
        @Expose
        private String changesetId;
        @SerializedName("new_changeset")
        @Expose
        private Boolean newChangeset;
        @SerializedName("time")
        @Expose
        private String time;
        @SerializedName("status")
        @Expose
        private Status status;
        @SerializedName("rqst")
        @Expose
        private Rqst rqst;
        @SerializedName("stops")
        @Expose
        private List<Stop> stops = null;

        public String getChangesetId() {
            return changesetId;
        }

        public void setChangesetId(String changesetId) {
            this.changesetId = changesetId;
        }

        public Boolean getNewChangeset() {
            return newChangeset;
        }

        public void setNewChangeset(Boolean newChangeset) {
            this.newChangeset = newChangeset;
        }

        public String getTime() {
            return time;
        }

        public void setTime(String time) {
            this.time = time;
        }

        public Status getStatus() {
            return status;
        }

        public void setStatus(Status status) {
            this.status = status;
        }

        public Rqst getRqst() {
            return rqst;
        }

        public void setRqst(Rqst rqst) {
            this.rqst = rqst;
        }

        public List<Stop> getStops() {
            return stops;
        }

        public void setStops(List<Stop> stops) {
            this.stops = stops;
        }

    }




    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.View;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.TextView;

    import java.util.List;
    import java.util.Random;

    import retrofit2.Call;
    import retrofit2.Callback;
    import retrofit2.Response;

    import static android.R.attr.x;
    import static android.media.CamcorderProfile.get;
    import static com.example.neelpatel.weatherapp.MTDApi.retrofit;

    public class MainActivity extends AppCompatActivity {

        String key= "b7cd7d8c64b24b4f8415aeb57d6f7f74";
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);//Starts Retrofit
            final MTDApi mtdApi = MTDApi.retrofit.create(MTDApi.class);

            //Sets up Button and EditText for use in this class
            final EditText edit = (EditText) findViewById(R.id.edit);
            Button requestButton = (Button) findViewById(R.id.button);

            //Behavior once button is clicked
            requestButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                    String s = edit.getText().toString();
                    //Sets up up the API call
                    Call<List<Example>> call = mtdApi.loadStops(key,s);

                    //Runs the call on a different thread
                    call.enqueue(new Callback<List<Example>>() {
                        @Override
                        //Once the call has finished

                        public void onResponse(Call<List<Example>> call, Response<List<Example>> response) {
                            if (response.isSuccessful()) {
                                //Gets the list of stops
                                List<Example> stops = response.body();
                                List<Stop> list = stops.get(0).getStops();
                                String text = list.get(0).getStopId();
                                edit.setText(text);
                            } else {
                                // show error message
                                Log.e("RequestCall", "Request failed");
                            }
                        }

                        @Override
                        //If the call failed
                        public void onFailure(Call<List<Example>> call, Throwable t) {
                            edit.setText("Request Failed");
                            Log.e("RequestCall", "Request failed");
                        }
                    });
                }
            });
        }
    }







        import java.util.List;

        import retrofit2.Call;
        import retrofit2.Retrofit;
        import retrofit2.converter.gson.GsonConverterFactory;
        import retrofit2.http.GET;
        import retrofit2.http.Path;
        import retrofit2.http.Query;

        /**
         * Class that details the request(s) that we will call
         */

        public interface MTDApi{
            @GET("GetStopsBySearch")
            Call<List<Example>> loadStops(@Query("key") String key,
            @Query("query") String query);
            Retrofit retrofit = new Retrofit.Builder()
            .baseUrl("https://developer.cumtd.com/api/v2.2/json/")
            .addConverterFactory(GsonConverterFactory.create())
            .build();

    }


    import com.google.gson.annotations.Expose;
    import com.google.gson.annotations.SerializedName;

    public class Params {

        @SerializedName("count")
        @Expose
        private Integer count;
        @SerializedName("query")
        @Expose
        private String query;

        public Integer getCount() {
            return count;
        }

        public void setCount(Integer count) {
            this.count = count;
        }

        public String getQuery() {
            return query;
        }

        public void setQuery(String query) {
            this.query = query;
        }

    }


    import com.example.neelpatel.weatherapp.Params;
    import com.google.gson.annotations.Expose;
    import com.google.gson.annotations.SerializedName;

    public class Rqst {

        @SerializedName("method")
        @Expose
        private String method;
        @SerializedName("params")
        @Expose
        private Params params;

        public String getMethod() {
            return method;
        }

        public void setMethod(String method) {
            this.method = method;
        }

        public Params getParams() {
            return params;
        }

        public void setParams(Params params) {
            this.params = params;
        }

    }


    import com.google.gson.annotations.Expose;
    import com.google.gson.annotations.SerializedName;

    public class Status {

        @SerializedName("code")
        @Expose
        private Integer code;
        @SerializedName("msg")
        @Expose
        private String msg;

        public Integer getCode() {
            return code;
        }

        public void setCode(Integer code) {
            this.code = code;
        }

        public String getMsg() {
            return msg;
        }

        public void setMsg(String msg) {
            this.msg = msg;
        }

    }



    import java.util.List;

    import com.example.neelpatel.weatherapp.StopPoint;
    import com.google.gson.annotations.Expose;
    import com.google.gson.annotations.SerializedName;

    public class Stop {

        @SerializedName("stop_id")
        @Expose
        private String stopId;
        @SerializedName("stop_name")
        @Expose
        private String stopName;
        @SerializedName("code")
        @Expose
        private String code;
        @SerializedName("percent_match")
        @Expose
        private Integer percentMatch;
        @SerializedName("stop_points")
        @Expose
        private List<StopPoint> stopPoints = null;

        public String getStopId() {
            return stopId;
        }

        public void setStopId(String stopId) {
            this.stopId = stopId;
        }

        public String getStopName() {
            return stopName;
        }

        public void setStopName(String stopName) {
            this.stopName = stopName;
        }

        public String getCode() {
            return code;
        }

        public void setCode(String code) {
            this.code = code;
        }

        public Integer getPercentMatch() {
            return percentMatch;
        }

        public void setPercentMatch(Integer percentMatch) {
            this.percentMatch = percentMatch;
        }

        public List<StopPoint> getStopPoints() {
            return stopPoints;
        }

        public void setStopPoints(List<StopPoint> stopPoints) {
            this.stopPoints = stopPoints;
        }

    }


    import com.google.gson.annotations.Expose;
    import com.google.gson.annotations.SerializedName;

    public class StopPoint {

        @SerializedName("code")
        @Expose
        private String code;
        @SerializedName("stop_id")
        @Expose
        private String stopId;
        @SerializedName("stop_lat")
        @Expose
        private Double stopLat;
        @SerializedName("stop_lon")
        @Expose
        private Double stopLon;
        @SerializedName("stop_name")
        @Expose
        private String stopName;

        public String getCode() {
            return code;
        }

        public void setCode(String code) {
            this.code = code;
        }

        public String getStopId() {
            return stopId;
        }

        public void setStopId(String stopId) {
            this.stopId = stopId;
        }

        public Double getStopLat() {
            return stopLat;
        }

        public void setStopLat(Double stopLat) {
            this.stopLat = stopLat;
        }

        public Double getStopLon() {
            return stopLon;
        }

        public void setStopLon(Double stopLon) {
            this.stopLon = stopLon;
        }

        public String getStopName() {
            return stopName;
        }

        public void setStopName(String stopName) {
            this.stopName = stopName;
        }

    }

Answer 1

您没有提供有关故障本身的更多（任何）信息，但很容易发现至少一个可能的错误。在回复中，您需要Example个对象的列表：

Call<List<Example>> call = mtdApi.loadStops(key,s);

这不好，因为您可以在GetStopsBySearch的文档中看到返回的JSON对象不是列表（即不是JSON数组）。修复此操作非常简单，只需要一个Example对象而不是一个列表：

Call<Example> call = mtdApi.loadStops(key,s);

这显然意味着您必须更改Callback的签名，但您不需要额外的信息。

在Android studio中使用Retrofit获取GET请求的问题

1 个答案: