Expected BEGIN_ARRAY but was BEGIN_OBJECT | ArrayList issue

Question

I'm using the Gson library to save and retrieve an ArrayList of Players Objects.

My onStop()

@Override
protected void onStop() {
    super.onStop();
    SharedPreferences prefs = getSharedPreferences("X", MODE_PRIVATE);
    SharedPreferences.Editor editor = prefs.edit();
    Gson gson = new Gson();

    String guardJSON = gson.toJson(playersNoGuard);
    editor.putString(GUARD, guardJSON);

    editor.putString("lastActivity", getClass().getName());
    editor.apply();
}

My onCreate important part

ArrayList<Player> playersNoGuard;
RecyclerView myList;

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

    SharedPreferences prefs = getSharedPreferences("X", MODE_PRIVATE);
    String guardJSON = prefs.getString(GUARD, null);
    Type arrayListPlayers = new TypeToken<ArrayList<Player>>(){}.getType();
    Gson gson = new Gson();

    if(guardJSON != null) {
        playersNoGuard = gson.fromJson(guardJSON, arrayListPlayers);
    }

    // Get the players and remove the Clairvoyant
    Intent intent = this.getIntent();
    playersNoGuard = intent.getParcelableArrayListExtra("PLAYERS");

    [...] // Code skipped

    }

But when this Activity is run, I get the following error log:

Caused by: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 path $

What's wrong in this code?

Possible duplicate of GSON Expected BEGIN_ARRAY but was BEGIN_OBJECT — TapanHP
– TapanHP, Commented Jul 22, 2016 at 11:27

F43nd1r · Accepted Answer · 2016-07-22 17:47:28Z

1

You probably write to the same preferences entry somewhere else. Ensure that your key (GUARD) is unique throughout the application.

answered Jul 22, 2016 at 17:47

F43nd1r

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Community · Accepted Answer · 2017-05-23 11:52:59Z

0

The problem is with your Response while Gson converting a response it expected Array in response but in your response you have made you are passing Object.

This is already answered here and here

here is reverse situation described.

edited May 23, 2017 at 11:52

CommunityBot

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answered Jul 22, 2016 at 11:54

TapanHP

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3 Comments

FET Over a year ago

Why am I passing an Object? I saved it as an ArrayList, I've used this same code for other ArrayLists and I get no errors

Tim Over a year ago

This is already answered here and here why dont you flag for duplicate instead of posting an answer then

FET Over a year ago

Guys, all these examples are not helping in my case, or at least I don't see how. I've used this code in other Activities and it's working fine. what did I do wrong?

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