Use parcelable to store item as sharedpreferences?

Question

I have a couple objects, Location, in my app stored in an ArrayList and use parcelable to move these between activities. The code for the object looks like this:

public class Location implements Parcelable{

private double latitude, longitude;
private int sensors = 1;
private boolean day;
private int cloudiness;

/*
Måste ha samma ordning som writeToParcel för att kunna återskapa objektet.
 */
public Location(Parcel in){
    this.latitude = in.readDouble();
    this.longitude = in.readDouble();
    this.sensors = in.readInt();
}

public Location(double latitude, double longitude){
    super();
    this.latitude = latitude;
    this.longitude = longitude;
}

public void addSensors(){
    sensors++;
}


public void addSensors(int i){
    sensors = sensors + i;
}

+ Some getters and setters.

Now I am in need of storing these objects more permanently. I read somewhere that I can serialize the objects and save as sharedPreferences. Do I have to implement serializeable aswell or can I do something similar with parcelable?

Answer 1

Since parcelable doesn't help to place your data in persistent storage (see StenSoft's answer), you can use gson to persist your Location instead:

Saving a Location:

val json = Gson().toJson(location)
sharedPreferences.edit().putString("location", json).apply()

Retrieving a Location:

val json = sharedPreferences.getString("location", null)
return Gson().fromJson(json, Location::class.java)

In case you're still using Java, replace val with String, Gson() with new Gson(), ::class.java with .class and end each line with a semicolumn.