android – 来自AlertDialog的findViewById(带自定义布局) – NullPointerException

我正在尝试从AlertDialog中的EditTexts中获取文本,这可以在下面看到创建.问题是,我无法检索textviews.我得到的只是一个空值.有任何想法吗？

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();
        }
    });
}

}

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

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