java.lang.ClassCastException: java.util.HashMap cannot be cast to java.lang.String when trying to retrieve arrayList items

Question

I am sending the arrayList from my main class which is listView to another class which displays details of individual items of the list.

 lv.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent, View view,
                                int position, long id) {
 Intent intent = new Intent(ListActivity.this, DetailActivity.class);
 intent.putExtra("event",myList);
 startActivity(intent);
 }

Now in DetailActivity.class this is how I get the ArrayList. I can see all the values correctly when I print the arrayList.

 Intent i = getIntent();
 ArrayList<String> myList = (ArrayList<String>) getIntent().getSerializableExtra("event");
 System.out.println(myList);

Here's how I am trying to retrieve the first value and store it in a variable.

  for (int e=0;e<myList.size();e++)
    {
        String name = myList.get(0);
        System.out.println(name);
    }

I get java.lang.ClassCastException: java.util.HashMap cannot be cast to java.lang.String What am I doing wrong here?

What is the type of myList in the first snippet?

X3Btel
– X3Btel

2017-03-06 21:35:43 +00:00
Commented Mar 6, 2017 at 21:35 — X3Btel
– X3Btel, Commented Mar 6, 2017 at 21:35
ArrayList<HashMap<String, String>> myList;

smiley
– smiley

2017-03-06 22:10:23 +00:00
Commented Mar 6, 2017 at 22:10 — smiley
– smiley, Commented Mar 6, 2017 at 22:10
you canot cast HasMap to String.

X3Btel
– X3Btel

2017-03-06 23:19:09 +00:00
Commented Mar 6, 2017 at 23:19 — X3Btel
– X3Btel, Commented Mar 6, 2017 at 23:19

X3Btel · Accepted Answer · 2017-03-06 23:22:17Z

2

In your first activity myList is Array of HashMap, and you try to cast it to String which cannot be done.

 ArrayList<HashMap<String, String>> myList = (ArrayList<HashMap<String, String>>) getIntent().getSerializableExtra("event");

This should be the correct way to convert it

answered Mar 6, 2017 at 23:22

X3Btel

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2 Comments

smiley Over a year ago

I need to iterate and store individual values in variables. Can you please guide me?

X3Btel Over a year ago

@smiley I dont know how your structure looks like and i expect you dont need Array of HashMap. But as this was question about the casting you can ask another one with your other problem

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