Send to Intent an ArrayList>

Question

I have in an activity an ArrayList<ArrayList<String>>, so basically a list of lists.

What I would like to accomplish, is to send from Activity 1 to Activity 2 this List of Lists, so I thought about intents, but I don't seem to be able to find the necessary getExtra().

To be more precise, questions contains Strings related to a question, and the corresponding position in answers contains all the selected answers to that question.

public class ReviewActivity extends AppCompatActivity {

ArrayList<String> questions = new ArrayList<>();
ArrayList<ArrayList<String>> answers = new ArrayList<>();

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

    Intent intent = getIntent();
    questions = intent.getStringArrayListExtra("questions");
    answers = intent.getStringArrayListExtra("answers");

}

This is how I put the original ArrayList<ArrayList<String>> in the intent:

 Intent mIntent = new Intent(this, ReviewActivity.class);
                            mIntent.putExtra("questions", questions);
                            mIntent.putExtra("answers", answers);
                            startActivity(mIntent);

The code gives an error at the line answers = intent.getStringArrayListExtra("answers");and I understand why, but how can I make a workaround?

Thanks.

here is solution in https://stackoverflow.com/questions/15324741/bundle-arraylist-arraylistinteger?answertab=votes#tab-top — Rahul Mandaliya, May 05 '18 at 12:32

score 3 · Accepted Answer · answered May 05 '18 at 12:32

3

ArrayList is Serializable so you can send it to bundle as Serializable.

 mIntent.putExtra("answers", answers);

To Get List :

ArrayList<ArrayList<String>> list= (ArrayList<ArrayList<String>>) getIntent().getExtras().getSerializable("answers");

answered May 05 '18 at 12:32

ADM

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Send to Intent an ArrayList>

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