android - 如何在 RealmObject 中保存 ArrayList savedPath

Question

我试图使用 Realm 保存这个对象但是我得到了这个错误

Error:(24, 9) error: Type java.util.ArrayList of field savedPath is not supported

这是我的代码:

public  class TrackingInfo extends RealmObject {
   private int order_id;
   private double savedDistance;
   private double savedDuration;
   private ArrayList <LatLng>savedPath;

public int getOrder_id() {
    return order_id;
}

public void setOrder_id(int order_id) {
    this.order_id = order_id;
}

public double getSavedDistance() {
    return savedDistance;
}

public void setSavedDistance(double savedDistance) {
    this.savedDistance = savedDistance;
}

public double getSavedDuration() {
    return savedDuration;
}

public void setSavedDuration(double savedDuration) {
    this.savedDuration = savedDuration;
}

public ArrayList<LatLng> getSavedPath() {
    return savedPath;
}

public void setSavedPath(ArrayList<LatLng> savedPath) {
    this.savedPath = savedPath;
}

 public TrackingInfo(){}}

提前致谢

Answer 1

List 和 LatLng 都不能直接存储在 Realm 中。您需要为 LatLng 创建模型对象，然后使用包含模型对象的 RealmList 对象。

public class Location extends RealmObject {
    public Location() { }
    double latitude;
    double longitude;
}

RealmList<Location> savedPath = new RealmList<Location>();
//Add location objects to savedPath and store it in your TrackingInfo object

当您从数据库中插入/检索时，您需要手动将 LatLng 类的对象转换为 Location 类。