GSON 在 Android API 26 和 API 28 之间以不同方式序列化 Location 对象

Question

我遇到以下代码片段在模拟器实例运行ning API 26 与一个运行ning API 28 之间工作方式不同的问题。这是我的代码片段运行将 GPS 点数据对象转换为 JSON.

GPSPointDataFinal dataFinal;
// bunch of code to put data into dataFinal

Gson gson = new GsonBuilder()
        .serializeNulls()
        .create();

String jsonFinalData = gson.toJson(dataFinal);

当我在 API 26 模拟器中运行这段代码时，我得到以下 JSON 输出：

{"gpsData":[ 
  {"elevation":0.0,"location":{ 
    mAltitude":0.0,"mBearing":122.0,"mBearingAccuracyDegrees":0.0,"mElapsedRealtimeNanos":70951742958220,"mExtras":null,"mFieldsMask":14,"mHorizontalAccuracyMeters":20.0,"mLatitude":38.9264983,"mLongitude":-77.0151,"mProvider":"fused","mSpeed":0.0,"mSpeedAccuracyMetersPerSecond":0.0,"mTime":1575977406000,"mVerticalAccuracyMeters":0.0},
  "newSplit":false,"pointStatus":2,"time":{
    "year":2019,"month":11,"dayOfMonth":10,"hourOfDay":6,"minute":30,"second":6}
  }

请注意，所有与位置相关的数据都在此 JSON 字符串中。当我运行在 API 28 模拟器中使用相同的代码时，我得到以下 JSON 输出：

{"gpsData":[
  {"elevation":40.8,"location":{
    "mElapsedRealtimeNanos":9517448972700,"mProvider":"fused"},
  "newSplit":false,"pointStatus":2,"time":{
    "year":2019,"month":11,"dayOfMonth":10,"hourOfDay":6,"minute":32,"second":2}
  }

请注意，位置数据的 none 在 JSON 字符串中。在这两种情况下，我都逐步执行了代码并确认在执行 gson.toJson(dataFinal).

之前 dataFinal 对象中有数据。

调试时，我在 logcat 中没有看到 GSON 或 JSON 相关条目。知道这是什么原因以及如何解决这个问题吗？

有关信息，这是我的 classes:

public class GPSPointDataFinal {

private GregorianCalendar startTime;
private ArrayList<GPSPointData> gpsData;
private CollectGPSDataServiceStatus status;
private ArrayList<Integer> splitList;

public GregorianCalendar getStartTime() {
    return startTime;
}

public void setStartTime(GregorianCalendar startTime) {
    this.startTime = startTime;
}

public ArrayList<GPSPointData> getGpsData() {
    return gpsData;
}

public void setGpsData(ArrayList<GPSPointData> gpsData) {
    this.gpsData = gpsData;
}

public CollectGPSDataServiceStatus getStatus() {
    return status;
}

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

public ArrayList<Integer> getSplitList() {
    return splitList;
}

public void setSplitList(ArrayList<Integer> splitList) {
    this.splitList = splitList;
}

}

public class GPSPointData {

private Location location;
private double elevation;
private GregorianCalendar time;
private int pointStatus;
private boolean newSplit;


public GPSPointData(Location location, GregorianCalendar time, int status) {
    this.location = location;
    this.elevation = elevation;
    this.time = time;
    this.pointStatus = status;
}

public GPSPointData() {
}

public Location getLocation() {
    return location;
}

public double getElevation() {
    return elevation;
}


public GregorianCalendar getTime() {
    return time;
}

public void setLocation(Location location) {
    this.location = location;
}

public void setElevation(double elevation) {
    this.elevation = elevation;
}

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

public int getPointStatus() {
    return pointStatus;
}

public void setPointStatus(int status) {
    this.pointStatus = status;
}

public boolean isNewSplit() {
    return newSplit;
}

public void setNewSplit(boolean newSplit) {
    this.newSplit = newSplit;
}
}

Answer 1

根据上面 Clownba0t 的建议，通过将我需要的特定字段从 Location 对象中提取到我的 GPSPointData 对象中并且不包括位置对象，问题得到了解决。转换为 JSON 时，现在包含所有字段。

GSON 在 Android API 26 和 API 28 之间以不同方式序列化 Location 对象

GSON serializing Location object differently between Android API 26 and API 28

gps

android

json

gson