Uploaded July 2018 | Updated September 2026, 2 weeks ago

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Toolbar or Action-bar or Menu, is quite useful feature you have to take benefit from it, by creating action or menu items to do some action in your app, or you can use it for navigation and for displaying logo or your app brand.
so, in this video you'll learn about toolbar...
and at the end of this video you'll face a small issue in updating the parent activity, I've already explained that in this tutorial:
youtu.be/geql_wwXIhw

but, if you can't solve it here is the solution:
ListOfUsers.java:


@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case R.id.new_user:
Intent intent = new Intent(this, NewUser.class);
startActivityForResult(intent,2);
return true;
default:
return super.onOptionsItemSelected(item);

}

}


@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(resultCode == RESULT_OK){
if(requestCode == 1){
if(data!=null){
//mUsersAdapter.notifyDataSetChanged();
String action = data.getStringExtra("action");
if(action.equals("update")){
mUsersAdapter.notifyItemChanged(mPosition);
}else if(action.equals("delete")){
mUsersAdapter.notifyItemRemoved(mPosition);
}
}
}else if(requestCode == 2){
mUsersAdapter.notifyItemInserted(mUsers.size());
}
}
}

========================================
NewUser.java:

mAdd_btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
setResult(RESULT_OK,null);
User user = new User();
user.setFirstname(mFirstname_editTxt.getText().toString());
user.setEmail(mEmail_editTxt.getText().toString());

UsersBase.get().newUser(user);
Toast.makeText(NewUser.this,"New user has been added to the list",
Toast.LENGTH_LONG).show();
mFirstname_editTxt.setText("");
mEmail_editTxt.setText("");
}
});