How can I pass an Arraylist from one activity to another and put it in a ListView?

Question

I am trying to pass an arrayList from one activity to another through Intent, but when executing the program the application crashes.

From here I want to send the arraylist

save.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {

        ArrayList<String> list = new ArrayList<>();
        String name = nameInput.getText().toString();
        list.add(name);

        Intent intent = new Intent(Class2.this, Class1.class);
        intent.putExtra("key", list);
        startActivity(intent);
    }
});

and here I want to receive it

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_names);

    ListView myList = findViewById(R.id.list);
    ArrayList<String> nameList= (ArrayList<String>) getIntent().getSerializableExtra("key");
    ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, nameList);
    list.setAdapter(adapter);
}

And error is:

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

How can I pass an Arraylist from one activity to another and put it in a ListView?

0 Answers0