DialogFragment argument and nullpointer exception

Question

My class should pass an argument to DialogFragment, but my app crashes inside onCreate method (of dialog class) for a NullPointerException. Dialog fragment class portion of

Answer 1

You're creating a ConfirmDialog via the constructor, then calling newInstance(), which creates another (proper) ConfirmDialog. However you then discard that proper instance.

To fix this:

Your newInstance() method should be static:

public static ConfirmDialog newInstance(String f) {
    ConfirmDialog d = new ConfirmDialog();

    Bundle args = new Bundle();
    args.putString("FILE_NAME", f);
    d.setArguments(args);

    return d;
}

And showConfirmDialog() should be changed so it uses the newInstance() method properly.

private void showConfirmDialog(String file) {
    FragmentManager fm = getSupportFragmentManager();
    Log.i("SHOWFILEACTIVITY", file);

    ConfirmDialog dialog = ConfirmDialog.newInstance(file);
    dialog.show(fm, "fragment_confirm_dialog");
}