Sending ArrayList with intent putExtra

Question

I am developing an android application and I am trying to send an array to another intent. I want to show them in a listview.

How i can achive that?

I have 2 problems.

How to send them to be able later to show them
How to show datas via listview.

On the first activity, when I log out the data its okay.

On the second activity, when i log out the received data, i got null. When I run the app, force close.

java.lang.NullPointerException: Attempt to invoke interface method 'int java.util.List.size()' on a null object reference

First activity:

  List<String> myList = new ArrayList<String>(Arrays.asList(selectImages));


                    Intent intent = new Intent(Gallery.this,Upload.class);
                    intent.putExtra("mylist", selectImages);
                    startActivity(intent);

Second activity:

public class Upload extends AppCompatActivity {
ListView listView;

ArrayAdapter<String> adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_upload);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    listView = (ListView) findViewById(R.id.list);

    Intent i = getIntent();
    ArrayList<String> list = i.getStringArrayListExtra("mylist");

   ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, android.R.id.text1, list);
    listView.setAdapter(adapter);
    Log.i("data","UPLOAD:"+list);
}}

Sathish Kumar J · Answer 1 · 2016-07-22T12:46:54.123

2

Use

putParcelableArrayListExtra()

Check @ Jordi Castilla comment

EDIT 1

here is the clear Example

edited Jul 22 '16 at 12:46

answered Jul 22 '16 at 11:58

Sathish Kumar J

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cannot resolve method 'putExtra(java.lang.String,java util.List)' – Janos Jul 22 '16 at 12:03
3

http://stackoverflow.com/questions/6541088/how-to-put-a-list-in-intent – Jordi Castilla Jul 22 '16 at 12:04
tried every possible way like in that post, nothing worked so far :/ – Janos Jul 22 '16 at 12:11
try http://stackoverflow.com/a/15790688/3981656 – Sathish Kumar J Jul 22 '16 at 12:12
i made a printscreen of the error, http://i.imgur.com/ASKSW3c.png – Janos Jul 22 '16 at 12:26
try with edited answer – Sathish Kumar J Jul 22 '16 at 12:47
its working now, but again just the last item is being sent. i logged the first page, its okay, but when i sent the data, just the last selected one arrived.. – Janos Jul 22 '16 at 13:37
this is the receiving: Bundle b = getIntent().getExtras(); if(b!=null){ ArrayList arr = (ArrayList)b.getStringArrayList("array_list"); Log.i("adat","UPLOAD:"+arr); ArrayAdapter adapter = new ArrayAdapter(this,android.R.layout.simple_list_item_1, android.R.id.text1, arr); listView.setAdapter(adapter); } – Janos Jul 22 '16 at 13:37

Sending ArrayList with intent putExtra

1 Answers1