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](http://stackoverflow.com/questions/16654042/gson-expected-begin-array-but-was-begin-object) — TapanHP, Jul 22 '16 at 11:27
I've sjown you the code, how I save and retrieve it. Thus I've also used the same code in other Activities and I get no errors, what ya think? @TimCastelijns — FET, Jul 22 '16 at 15:09
It doesn't matter what I "think", your json is an object not an array - it's a fact not a thought — Tim, Jul 22 '16 at 15:10
Yeah and how's this supposed to help me solve the issue @TimCastelijns — FET, Jul 22 '16 at 15:20
You probably write to the same preferences entry somewhere else. Ensure that your key is unique. — F43nd1r, Jul 22 '16 at 17:39
Yes, that's exactly what I was missing. Please @F43nd1r may you post an answer I can accept? — FET, Jul 22 '16 at 17:44

score 1 · Accepted Answer · answered Jul 22 '16 at 17:47

1

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

answered Jul 22 '16 at 17:47

F43nd1r

7,690
3
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score 0 · Answer 2 · edited May 23 '17 at 11:52

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 '17 at 11:52

Community

1
1

answered Jul 22 '16 at 11:54

TapanHP

5,969
6
37
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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 – FET Jul 22 '16 at 12:44
*This is already answered here and here* why dont you flag for duplicate instead of posting an answer then – Tim Jul 22 '16 at 15:01
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? – FET Jul 22 '16 at 17:37

Expected BEGIN_ARRAY but was BEGIN_OBJECT | ArrayList issue

My onStop()

My onCreate important part

2 Answers2

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