private void ShowUpdateDialog() {    Log.i("version", "shengji");        AlertDialog.Builder dialog = new Builder(this);        dialog.setTitle("提醒升级");        dialog.setMessage("是否进行升级？");        dialog.setPositiveButton("立刻升级", new OnClickListener() {                        @Override            public void onClick(DialogInterface dialog, int which) {                // TODO Auto-generated method stub                            }        });        dialog.setNegativeButton("暂不升级", new OnClickListener() {                        @Override            public void onClick(DialogInterface dialog, int which) {                // TODO Auto-generated method stub                dialog.dismiss();                ShowMainActivity();            }        });        dialog.show();    }