★17.ダイアログ

Dialog d = new AlertDialog.Builder(getActivity())
        .setView(/* View */)
        .setTitle(/* String */)
        .setPositiveButton(android.R.string.ok, (dialog, which) -> {
            // do something
        })
        .setNegativeButton(android.R.string.cancel, (dialog, which) -> {
            // do something
        })
        .create();

public class DatePickerFragment extends DialogFragment {
    public static final String EXTRA_DATE = "com.bignerdranch.android.criminalintent.date";
    private static final String ARG_DATE = "date";

    //   Fragment  ，  Date        
    public static DatePickerFragment newInstance(Date date) {
        Bundle args = new Bundle();
        args.putSerializable(ARG_DATE, date);
        DatePickerFragment fragment = new DatePickerFragment();
        fragment.setArguments(args);
        return fragment;
    }

    //      
    @NonNull
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        return new AlertDialog.Builder(getActivity())
                .setView(/* View */)
                .setTitle(/* String */)
                .setPositiveButton(android.R.string.ok, (dialog, which) -> {
                    // do something
                })
                .setNegativeButton(android.R.string.cancel, (dialog, which) -> {
                    // do something
                })
                .create();
    }
}

FragmentManager manager = getFragmentManager();
DatePickerFragment dialog = DatePickerFragment.newInstance(/*    */);
dialog.setTargetFragment(/*   Fragment */, /*    */);
dialog.show(manager, DIALOG_DATE);