操作栏在警报对话框（图2）中为EditText选择全部/剪切/复制不显示，请帮助

编辑：代码是

            View view = MainActivity.this.getLayoutInflater().inflate(
                    R.layout.custom_dialog, null);
            AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
                    MainActivity.this);
            alertDialogBuilder.setView(view);
            alertDialogBuilder.setPositiveButton("Add",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog,
                                int whichButton) {

                        }
                    });
            alertDialogBuilder.setNegativeButton("Cancel",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog,
                                int whichButton) {
                        }
                    });
            Dialog d = alertDialogBuilder.create();
            d.show();