问题
I want to store a custom object (let's call it MyObject) permanently so that if it is deleted from memory, I can reload it in my Activity/Fragment onResume() method when the app starts again.
How can I do that? SharedPreferences doesn't seem to have a method for storing parcelable objects.
回答1:
If you need to store it in SharedPreferences, you can parse your object to a json string and store the string.
private Context context;
private MyObject savedObject;
private static final String PREF_MY_OBJECT = "pref_my_object";
private SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
private Gson gson = new GsonBuilder().create();
public MyObject getMyObject() {
if (savedObject == null) {
String savedValue = prefs.getString(PREF_MY_OBJECT, "");
if (savedValue.equals("")) {
savedObject = null;
} else {
savedObject = gson.fromJson(savedValue, MyObject.class);
}
}
return savedObject;
}
public void setMyObject(MyObject obj) {
if (obj == null) {
prefs.edit().putString(PREF_MY_OBJECT, "").commit();
} else {
prefs.edit().putString(PREF_MY_OBJECT, gson.toJson(obj)).commit();
}
savedObject = obj;
}
class MyObject {
}
回答2:
You can write your Bundle as a parcel to disk, then get the Parcel later and use the Parcel.readBundle() method to get your Bundle back.
来源：https://stackoverflow.com/questions/14839400/how-to-permanently-store-parcelable-custom-object