Question

@Override
protected Dialog onCreateDialog(int id) {
    Dialog dialog = null;
    switch(id) {
    case DIALOG_ID:
        LayoutInflater inflater = getLayoutInflater();
        View InfoLayout = inflater.inflate(R.layout.info_dialog, null);
        AlertDialog.Builder b = new AlertDialog.Builder(MyActivity.this)
                .setView(InfoLayout );
        initInfoDialog(dialog);
        return dialog;
...

private void initInfoDialog(Dialog dialog) {
    //this line has the null pointer 
    WindowManager.LayoutParams lp = dialog.getWindow().getAttributes(); 

Why is dialog.getWindow() returning null in this case?

Answer 1

I faced the same problem and I see now the getWindow() documentation is actually telling why (not the reason but why at this specific point). You can retrieve the window after calling show().