I'm just getting started in android app development and today I tried to tackle my first useful app, It's not anything fancy, just a contact manager that stores contact info and stores them in a listview but when I compile it, the app starts and even lets met switch between tabs (one tab has the input boxes and the other the listview) but after I input the contact, the next time I try and switch to the other tab, the app crashes and in the dialog box I can see the app threw a Null pointer exception error. Is there anyway that I can fix this in my by changing my codes syntax?
public void populatelist() {
ArrayAdapter<Contact> adapter = new contactlistAdapater() ;
contactlistview.setAdapter(adapter);
}
private void addcontact(String name, String phone, String email, String address){
contacts.add(new Contact(name, phone,email, address)) ;
}
private class contactlistAdapater extends ArrayAdapter<Contact> {
public contactlistAdapater() {
super (MainActivity.this, R.layout.contact_layout, contacts) ;
}
@Override
public View getView(int position, View view, ViewGroup parent ){
if (view == null)
getLayoutInflater().inflate(R.layout.contact_layout, parent, false) ;
Contact CurrentContact = contacts.get(position) ;
TextView name = (TextView) view.findViewById(R.id.name) ;
name.setText(CurrentContact.getname());
TextView phone = (TextView) view.findViewById(R.id.Phone) ;
phone.setText(CurrentContact.getphone());
TextView email = (TextView) view.findViewById(R.id.Email) ;
email.setText(CurrentContact.getemail());
TextView address = (TextView) view.findViewById((R.id.address)) ;
address.setText(CurrentContact.getaddress());
return view ;
}
}