Androidフィレットdialog、幅と高さを制限

        AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
        View contentView = getActivity().getLayoutInflater().inflate(R.layout.layout_dialog_contact, null);
        builder.setView(contentView);
        AlertDialog dialog = builder.create();
        dialog.getWindow().setBackgroundDrawable(new BitmapDrawable()); //     .
        dialog.setCanceledOnTouchOutside(false); //        .
        dialog.getWindow().setGravity(Gravity.CENTER); //   .
        dialog.show();
        WindowManager m = getActivity().getWindowManager();
        Display d = m.getDefaultDisplay(); //      、  
        WindowManager.LayoutParams p = dialog.getWindow().getAttributes(); //            
        p.height = (int) (d.getHeight() * 0.4); //         0.4
        p.width = (int) (d.getWidth() * 0.9); //         0.9
        dialog.getWindow().setAttributes(p);

shapeを背景にフィレットを実現するdialog
注意:dialog.getWindow().setAttributes(p); show()メソッドの後に呼び出す必要があります