MainActivity.java

    
    ...
    
    private User selectedUser; //hold selected user

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        
        ...

        list_data.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                User user = (User) adapterView.getItemAtPosition(i);
                selectedUser = user;
                input_name.setText(user.getName());
                input_email.setText(user.getEmail());
            }
        });

        ...

    }