如何在service中显示对话框dialog

AlertDialog.Builder b = new AlertDialog.Builder(StatusBarService.this);        b.setView(view);        final AlertDialog d = b.create();        d.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG); //系统中关机对话框就是这个属性         //d.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);  //窗口可以获得焦点，响应操作         //d.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY);  //窗口不可以获得焦点，点击时响应窗口后面的界面点击事件         d.show();        Button yesButton = (Button) view.findViewById(R.id.yes_button);        Button canclButton = (Button) view.findViewById(R.id.cancl_button);        yesButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent intent = new Intent(Intent.ACTION_REQUEST_SHUTDOWN);                intent.putExtra(Intent.EXTRA_KEY_CONFIRM, false);                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);                startActivity(intent);            }        });        canclButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                d.dismiss();            }        });