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Start your free trialMatthew Francis
6,967 PointsWhy do we need an activity lifecycle for Dialogs?
Creating a dialog:
public class AlertDialogFragment extends DialogFragment {
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
Context context = getActivity(); //get whatever activity class the dialog is created in
AlertDialog.Builder builder = new AlertDialog.Builder(context)
.setTitle(context.getResources().getString(R.string.error_title)) //getResource() not neccecary, added just in case
.setMessage(context.getResources().getString(R.string.error_message))
.setPositiveButton(context.getResources().getString(R.string.error_message_ok_button), null);
AlertDialog dialog = builder.create();
return dialog;
}
}
Why is the onCreateDialog needed? what benefits does it yield?
Extra question:
private void alertAboutUserError(){
AlertDialogFragment dialog = new AlertDialogFragment();
dialog.show(getFragmentManager(),"error_dialog"); //confused about this code
}
A bit puzzeled on the second arugment, why is the string needed? I've read it's a reference for dialog? how would you use it?
1 Answer
J.D. Sandifer
18,813 PointsThe short answer is that it's the way to create your own custom Dialog object.
To learn more about it - and any Android API question - check out the Android Developers Reference. Here's the page on this specific topic: Alert Dialog.
I just googled "Android AlertDialogFragment" and it was the first link. You can read earlier on the page to learn more about DialogFragment in general.