Display AlertDialog extending DialogFragment or from a method in onCreateView() - android-fragments

Question

Hell o,
I would like to know if it's preferrable to inflate a fragment extending DialogFragment class or to display the dialog from a simple method added in onCreateView() ?
Here's a snippet for the second solution from internet (based on an activity and not fragment) :
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
positiveDialog = findViewById(R.id.btnPositiveDialog);
negativeDialog = findViewById(R.id.btnNegativeDialog);
positiveDialog.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
showAlertDialog(R.layout.dialog_postive_layout);
}
});
negativeDialog.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
showAlertDialog(R.layout.dialog_negative_layout);
}
});
}
private void showAlertDialog(int layout){
dialogBuilder = new AlertDialog.Builder(MainActivity.this);
View layoutView = getLayoutInflater().inflate(layout, null);
Button dialogButton = layoutView.findViewById(R.id.btnDialog);
dialogBuilder.setView(layoutView);
alertDialog = dialogBuilder.create();
alertDialog.getWindow().getAttributes().windowAnimations = R.style.DialogAnimation;
alertDialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
alertDialog.show();
dialogButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
alertDialog.dismiss();
}
});
}
}
My only concern is that i use a fragment among navigationDrawer where i want to display my alertDialog (1 editText and 2 buttons), and i would like to prevent user from closing the dialog via backbutton or clicking outside the dialog.
Thank you very much for helping me out