AlertDialog example giving errors

Question

I'm new to Java/ Android development (I started learning last night) so it is entirely possible I'm doing something horrendously stupid. However, after more than an hour Googling I've come up with nothing. I'm using Eclipse as my editor.

I'm reading the docs here for AlertDialog, which gives an example:

public static class MyAlertDialogFragment extends DialogFragment {

    public static MyAlertDialogFragment newInstance(int title) {
        MyAlertDialogFragment frag = new MyAlertDialogFragment();
        Bundle args = new Bundle();
        args.putInt("title", title);
        frag.setArguments(args);
        return frag;
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        int title = getArguments().getInt("title");

        return new AlertDialog.Builder(getActivity())
                .setIcon(R.drawable.alert_dialog_icon)
                .setTitle(title)
                .setPositiveButton(R.string.alert_dialog_ok,
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int whichButton) {
                            ((FragmentAlertDialog)getActivity()).doPositiveClick();
                        }
                    }
                )
                .setNegativeButton(R.string.alert_dialog_cancel,
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int whichButton) {
                            ((FragmentAlertDialog)getActivity()).doNegativeClick();
                        }
                    }
                )
                .create();
    }
}

I originally re-wrote it so I can start committing some of the methods to memory, but got an error "FragmentAlertDialog cannot be resolved to a type". I hit Ctrl+Shift+O to make sure I had the proper imports, but still it didn't go away.

So I copied/ pasted the example code and did the following, in this order:

1. Hit Ctrl+Shift+O to get the imports right (using android.app.DialogFragment, not android.support.v4.app.DialogFragment)
2. Declared my package at the top
3. Replaced R.string.alert_dialog_ok and R.string.alert_dialog_cancel with android.R.string.ok and android.R.string.cancel respectively
4. Removed setIcon(), as I don't have an icon to put in yet

I'm still getting errors:

1. FragmentAlertDialog cannot be resolved to a type (x4)
2. Illegal modifier for the class MyAlertDialogFragment; only public, abstract & final are permitted

Am I doing something wrong, or is there something wrong with the example code?

Answer 1

1.FragmentAlertDialog

Make sure the Activity you want to cast to is named FragmentAlertDialog. Make sure to also save everything - sometimes Eclipse won't make the connection until everything is saved.

2.Illegal modifier for the class MyAlertDialogFragment; only public, abstract & final are permitted

Take out the static modifier:

public class MyAlertDialogFragment extends DialogFragment {

or keep static and move this Fragment so it is enclosed within the Activity you want. This means that MyAlertDialogFragment should be inside your Activity, before that Activity's closing brace.

I'm new to Java/Android development

Don't start off with something so complicated. Learn Java then move to Android.