Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2, jsonSyntax Error

Question

I want to save Hashset Object in to Sharedpreference and than want retrieve that data. I am storing data in to hashset and and converting object in to json using Gson. Actually m storing bitmap in to Hashset. I am able to convert and save Hashsetobject into sharedpreference. I am getting problem when I am retrieving and converting json to Hashset Object.

HashSet<images> img = new HashSet<images>(CIRCLES_LIMIT);

Here is Method For Saving Object in to Sharedpreference.

  public void saveString() throws JSONException {

    Object spSquare = c.getStringDrawObjImages();


    SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(getContext());
    SharedPreferences.Editor editor = sharedPrefs.edit();
    Gson gson = new Gson();


    String jsonSquare = gson.toJson(spSquare)
    editor.putString("kEySquare", jsonSquare);
    editor.commit();

}

Method For Retrieving That Object.

   public void openString() {
    SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(getContext());
    Gson gson = new Gson();

    String jsonSquare=sharedPrefs.getString("kEySquare",null);



  Type typeSquare = new TypeToken<HashSet<images>>(){}.getType();
    HashSet<images> arrayListSquare = gson.fromJson(jsonSquare,typeSquare);`//getting Exception here jsonSyntax Error`


    if (arrayListSquare != null) {
        img = arrayListSquare;
    }
}

{ "img": "[Circle[218.69626, 475.58936, 0,android.graphics.Bitmap@42e13c70,0.0,0.0,0.0,0.0,0.0,0.0,], Circle[186.74065, 670.43713, 0,android.graphics.Bitmap@42e13c70,0.0,0.0,0.0,0.0,0.0,0.0,]]" } — Nitin Thakor, Sep 28 '16 at 08:56

score 1 · Answer 1 · answered Sep 28 '16 at 09:03

1

As per your comment your json as follows is not in format so that Gson can parse it as you are receiving your circle attribute in string not as json.

{
  "img": "[Circle[218.69626, 475.58936, 0,android.graphics.Bitmap@42e13c70,0.0,0.0,0.0,0.0,0.0,0.0,]‌, Circle[186.74065, 670.43713, 0,android.graphics.Bitmap@42e13c70,0.0,0.0,0.0,0.0,0.0,0.0,]‌]"
}

So your Json is received as object having only attribute that is img.

and you are parsing it as array. That's error. So contact your back end developer and change json structure accordingly.

answered Sep 28 '16 at 09:03

Nikhil

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Actually I have checked json in jsonlint.com and it showing valid json – Nitin Thakor Sep 28 '16 at 09:19
@NitinMakwana It is valid json but not valid for parsing as array Via Gson – Nikhil Sep 28 '16 at 09:20
Is it possible to convert bitmap in to json? – Nitin Thakor Sep 29 '16 at 06:41
@NitinMakwana You need to convert your image to Base64 String and then you can send it via json as String. But again on sever you need to change Base64 string to image. – Nikhil Sep 29 '16 at 06:43
can you please provide some hint how can i do that with my hashset object of bitmaps? – Nitin Thakor Sep 29 '16 at 06:48
1

@NitinMakwana refer [this](http://stackoverflow.com/a/10226133/1157879). But if there are log of images then I recomemend set url's of those images in json – Nikhil Sep 29 '16 at 06:54

Benny Huo · Answer 2 · 2016-09-28T09:15:45.490

1

You serialise a object and want to deserialise it into a HashSet. That's the problem.

Object spSquare = c.getStringDrawObjImages();

What's the type of spSquare? Suppose it is 'Foo.class', you should deserialise it like this:

Foo foo = gson.fromJson(jsonString, Foo.class);

'foo.img' should be your HashSet

edited Sep 28 '16 at 09:15

answered Sep 28 '16 at 09:08

Benny Huo

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You should find out the right class. What on earth is the type of spSquare ? It seems to have only one field in it which is 'img', and the field 'img' turn out to be your HashSet, isn't it? – Benny Huo Sep 28 '16 at 12:46

Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2, jsonSyntax Error

2 Answers2