部分代码如下：

public void ShowAlertScreen(Context context,String titles,String content,String phone)

{

// 获取Service

wm = (WindowManager) context.getSystemService("window");

WindowManager.LayoutParams mWindowParams = new WindowManager.LayoutParams();

// 设置窗口类型，一共有三种Application windows, Sub-windows, System windows

// API中以TYPE_开头的常量有23个

mWindowParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;

// 设置期望的bitmap格式

mWindowParams.format = PixelFormat.RGBA_8888;

mWindowParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL;

// 以下属性在Layout Params中常见重力、坐标，宽高

//mWindowParams.gravity = Gravity.LEFT | Gravity.TOP;

mWindowParams.width = WindowManager.LayoutParams.WRAP_CONTENT;

mWindowParams.height = WindowManager.LayoutParams.WRAP_CONTENT;

LayoutInflater inflater=(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

view=inflater.inflate(R.layout.activity_call_label, null);

TextView tv =(TextView) view.findViewById(R.id.txtPhone);

tv.setText(phone);

TextView title = (TextView) view.findViewById(R.id.txtTitle);

TextView alert = (TextView) view.findViewById(R.id.txtAlert);

ImageButton btnClose = (ImageButton) view.findViewById(R.id.btnJb2);

if(!titles.equals(""))

{

title.setText(titles);

}

alert.setText(content);

btnClose.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View arg0) {

// TODO Auto-generated method stub

try

{

// 获取Service

AlertDialog.Builder builder = new AlertDialog.Builder(FireWallService.this);

builder.setTitle("请选择举报类型") // title

.setItems(R.array.stype, new DialogInterface.OnClickListener() { //content

@Override

public void onClick(DialogInterface dialog, int which) {

wType = (which+1)+"";

new Thread() {

@Override

public void run()

{

WebClassCommonEntity result = new WebUtil().markPhone(getApplicationContext(),Configuration.imei,phone_num,wType);

}

}.start();

}});

AlertDialog ad = builder.create();

//ad.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG); //系统中关机对话框就是这个属性

ad.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);

ad.setCanceledOnTouchOutside(false);                                   //点击外面区域不会让dialog消失

ad.show();

}

catch(Exception eee)

{

}

}

});

// 添加指定视图

wm.addView(view, mWindowParams);

}

原文：http://www.cnblogs.com/virgilko/p/4643405.html