Android 改进GSON返回null

我正在尝试使用改型来制作一个简单的应用程序，它将解析JSON数组，并获取一些数据，如纬度和经度，但问题是返回null。我是新装修的。请解释你发布的解决方案

这是我的密码

MainActivity.java

package com.example.akshay.retrofitgsonjsonarray;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.Toast;

import retrofit.Callback;
import retrofit.RestAdapter;
import retrofit.RetrofitError;
import retrofit.client.Response;

public class MainActivity extends AppCompatActivity {
    public final String URL = "https://roads.googleapis.com/v1";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        RestAdapter restAdapter = new RestAdapter.Builder().setEndpoint(URL).setLogLevel(RestAdapter.LogLevel.FULL).build();
        api api = restAdapter.create(api.class);
        api.getData(new Callback<SnappedPoints>() {
            @Override
            public void success(SnappedPoints snappedPoints, Response response) {
                Toast.makeText(MainActivity.this ,String.valueOf(snappedPoints.location.getLatitude()) , Toast.LENGTH_LONG ).show();
            }

            @Override
            public void failure(RetrofitError error) {
                Toast.makeText(MainActivity.this, "Something went wrong", Toast.LENGTH_LONG).show();
            }
        });
    }


}

Location.java

package com.example.akshay.retrofitgsonjsonarray;

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

/**
 * Created by Akshay on 9/14/2015.
 */
public class Location {


    @SerializedName("latitude")
    @Expose
    Double latitude;
    @SerializedName("longitude")
    @Expose
    Double longitude;

    public void setLatitude(Double latitude) {
        this.latitude = latitude;
    }

    public Double getLatitude() {
        return latitude;
    }

    public void setLongitude(Double longitude) {
        this.longitude = longitude;
    }

    public Double getLongitude() {
        return longitude;
    }
}

api.java

package com.example.akshay.retrofitgsonjsonarray;
import retrofit.Callback;
import retrofit.http.GET;

/**
 * Created by Akshay on 9/8/2015.
 */
public interface api {
    @GET("/snapToRoads?path=-35.27801,149.12958&interpolate=true&key=KEY")
    public void getData( Callback<SnappedPoints> response);
}

package com.example.akshay.gsonjsonarray；
进口改装.回收；
导入reformation.http.GET；
/**
*由Akshay于2015年9月8日创建。
*/
公共接口api{
@GET（“/snapToRoads？path=-35.27801149.12958&interpolate=true&key=key”）
public void getData（回调响应）；
}

我试图从中得到经纬度，但没有得到任何结果

这是我的日志：

09-14 14:53:15.820  19592-19636/com.example.akshay.retrofitgsonjsonarray D/Retrofit﹕ <--- HTTP 200 https://roads.googleapis.com/v1/snapToRoads?path=-35.27801,149.12958&interpolate=true&key=KEYHERE_Ihavechangedthis (1901ms)
09-14 14:53:15.820  19592-19636/com.example.akshay.retrofitgsonjsonarray D/Retrofit﹕ : HTTP/1.1 200 OK
09-14 14:53:15.820  19592-19636/com.example.akshay.retrofitgsonjsonarray D/Retrofit﹕ Alt-Svc: quic=":443"; p="1"; ma=604800
09-14 14:53:15.820  19592-19636/com.example.akshay.retrofitgsonjsonarray D/Retrofit﹕ Alternate-Protocol: 443:quic,p=1
09-14 14:53:15.820  19592-19636/com.example.akshay.retrofitgsonjsonarray D/Retrofit﹕ Cache-Control: private
09-14 14:53:15.820  19592-19636/com.example.akshay.retrofitgsonjsonarray D/Retrofit﹕ Content-Type: application/json; charset=UTF-8
09-14 14:53:15.820  19592-19636/com.example.akshay.retrofitgsonjsonarray D/Retrofit﹕ Date: Mon, 14 Sep 2015 09:23:17 GMT
09-14 14:53:15.820  19592-19636/com.example.akshay.retrofitgsonjsonarray D/Retrofit﹕ Server: ESF
09-14 14:53:15.820  19592-19636/com.example.akshay.retrofitgsonjsonarray D/Retrofit﹕ Transfer-Encoding: chunked
09-14 14:53:15.820  19592-19636/com.example.akshay.retrofitgsonjsonarray D/Retrofit﹕ Vary: Origin
09-14 14:53:15.820  19592-19636/com.example.akshay.retrofitgsonjsonarray D/Retrofit﹕ Vary: X-Origin
09-14 14:53:15.820  19592-19636/com.example.akshay.retrofitgsonjsonarray D/Retrofit﹕ Vary: Referer
09-14 14:53:15.820  19592-19636/com.example.akshay.retrofitgsonjsonarray D/Retrofit﹕ X-Android-Received-Millis: 1442222595815
09-14 14:53:15.820  19592-19636/com.example.akshay.retrofitgsonjsonarray D/Retrofit﹕ X-Android-Response-Source: NETWORK 200
09-14 14:53:15.820  19592-19636/com.example.akshay.retrofitgsonjsonarray D/Retrofit﹕ X-Android-Sent-Millis: 1442222595304
09-14 14:53:15.820  19592-19636/com.example.akshay.retrofitgsonjsonarray D/Retrofit﹕ X-Content-Type-Options: nosniff
09-14 14:53:15.820  19592-19636/com.example.akshay.retrofitgsonjsonarray D/Retrofit﹕ X-Frame-Options: SAMEORIGIN
09-14 14:53:15.820  19592-19636/com.example.akshay.retrofitgsonjsonarray D/Retrofit﹕ X-XSS-Protection: 1; mode=block
09-14 14:53:15.820  19592-19636/com.example.akshay.retrofitgsonjsonarray D/Retrofit﹕ {
    "snappedPoints": [
    {
    "location": {
    "latitude": -35.278005228392438,
    "longitude": 149.12953569405369
    },
    "originalIndex": 0,
    "placeId": "ChIJp47M1mdNFmsRcF5UbW7qABM"
    }
    ]
    }
09-14 14:53:15.820  19592-19636/com.example.akshay.retrofitgsonjsonarray D/Retrofit﹕ <--- END HTTP (224-byte

---

09-14 14:53:15.820 19592-19636/com.example.akshay.reformationgsonjsonarray D/reformation﹕  我对改型没有任何线索，但看起来您的api返回了一个值数组，但您试图将其作为标量

请尝试以下操作：

    RestAdapter restAdapter = new RestAdapter.Builder().setEndpoint(URL).setLogLevel(RestAdapter.LogLevel.FULL).build();
    api api = restAdapter.create(api.class);
    api.getData(new Callback<SnappedPoints[]>() {
        @Override
        public void success(SnappedPoints[] snappedPoints, Response response) {

            Toast.makeText(MainActivity.this ,String.valueOf(snappedPoints[0].location.getLatitude()) , Toast.LENGTH_LONG ).show();
        }

        @Override
        public void failure(RetrofitError error) {
            Toast.makeText(MainActivity.this, "Something went wrong", Toast.LENGTH_LONG).show();
        }
    });

RestAdapter RestAdapter=new RestAdapter.Builder（）.setEndpoint（URL）.setLogLevel（RestAdapter.LogLevel.FULL）.build（）；
api=restAdapter.create（api.class）；
api.getData（新回调函数（）{
@凌驾
公共作废成功（快照点[]快照点，响应）{
Toast.makeText（MainActivity.this，String.valueOf（snapdpoints[0].location.getLatitude（）），Toast.LENGTH_LONG.show（）；
}
@凌驾
公共无效失败（错误）{
Toast.makeText（MainActivity.this，“出错了”，Toast.LENGTH_LONG.show（）；
}
});
您必须定义一个容器以满足JSON的定义：

public class SnappedPointsContainer {

@SerializedName("snappedPoints")
        @Expose
List<SnappedPoints> snappedPoints;

// TODO Getter & Setter

}

公共类快照点容器{
@SerializedName（“快照点”）
@暴露
列出捕捉点；
//托多·盖特和塞特
}

并将改装界面更改为：

public interface api {
    @GET("/snapToRoads?path=-35.27801,149.12958&interpolate=true&key=KEY")
    public void getData( Callback<SnappedPointsContainer> response);
}

公共接口api{
@GET（“/snapToRoads？path=-35.27801149.12958&interpolate=true&key=key”）
public void getData（回调响应）；
}

按以下方式定义回调：

api.getData(new Callback<SnappedPointsContainer>() {
    @Override
    public void success(SnappedPointsContainer snappedPointsContainer, Response response) {
        // TODO Process e.g. snappedPointsContainer.getSnappedPoints()
    }

    @Override
    public void failure(RetrofitError error) {
        Toast.makeText(MainActivity.this, "Something went wrong", Toast.LENGTH_LONG).show();
    }
});

api.getData（新回调（）{
@凌驾
公共无效成功（快照点容器快照点容器，响应）{
//TODO流程，例如SnapedPoints Container.GetSnapedPoints（）
}
@凌驾
公共无效失败（错误）{
Toast.makeText（MainActivity.this，“出错了”，Toast.LENGTH_LONG.show（）；
}
});
我认为您需要一个包含SnapedPoints的POJO类扫描您请向我提供您的响应字符串我确实有一个SnapedPoints类您能告诉我如何创建一个SnapedPoints数组，如您在此处提到的[…]。。我有点困惑，我的答案有点错误，你需要POJO类来保存捕捉点的数组。请参考@Christoper的回答列表和要点；SnapsdPoints课程在哪里。。在那个类中我应该做什么？您已经定义了那个类。做和以前一样的事情。你能告诉我在成功中获得纬度和经度应该做什么吗（）你说的是SnapdPoints Container.GetSnapdPoints（）它正在返回[com.example.akshay.ReformationSonJSonarray]。SnappedPoints@12915fb4]我定义的容器返回快照点列表。所以你应该反复浏览这个列表。对于每个列表项，您可以通过例如第一个项的snapdpoints container.getsnapdpoints.get（0）.getLocation（）来获取位置。
api.getData(new Callback<SnappedPointsContainer>() {
    @Override
    public void success(SnappedPointsContainer snappedPointsContainer, Response response) {
        // TODO Process e.g. snappedPointsContainer.getSnappedPoints()
    }

    @Override
    public void failure(RetrofitError error) {
        Toast.makeText(MainActivity.this, "Something went wrong", Toast.LENGTH_LONG).show();
    }
});