Android – findviewbyid (with custom layout) from alertdialog – NullPointerException

I'm trying to get text from edittexts in alertdialog, which can be seen below. The problem is that I can't retrieve textviews. All I get is a null value. Do you have any ideas?

    final EditText editFirstname = (EditText) findViewById(R.id.editFirstname);
    final EditText editLastname = (EditText) findViewById(R.id.editLastname);

    bttAddPlayer.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View view) {
            AlertDialog.Builder builder = new AlertDialog.Builder(context);

            LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            builder.setView(layoutInflater.inflate(R.layout.dialog_add_player, null))
                    .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int id) {
                            databaseHelper.addPlayer(editFirstname.getText().toString(),editLastname.getText().toString());
                            playerAdapter.notifyDataSetChanged();
                        }
                    })
                    .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            dialog.cancel();
                        }
                    });
            AlertDialog alertDialog = builder.create();
            alertDialog.show();
        }
    });
}

}

resolvent:

You need to search the view in which you inflate the alarm dialog box. For example, your inflated view is as follows:

    View view = inflater.inflate(R.layout.dialog_add_player, container);

What do you need to do

EditText editFirstName = (EditText) view.findViewById(R.id.editFirstName);
EditText editLastName  = (EditText) view.findViewById(R.id.editLastName);

Now it seems that you are trying to instantiate a variable for something that doesn't exist. You don't refer to the actual location of EditText. It tries to view the interior of the current view. It doesn't contain EditText