This example shows how to install all components of notification services , displaying progress dialog boxes 下面的示例说明如何安装notification services的所有组件，同时显示进度对话框：
You will see a progress dialog and then a post - install summary similar to those you saw for the original install 您将看到一个进度对话框，然后是一个安装后的摘要，该摘要与先前安装时看到的类似。
If the application wants to display a progress dialog box that can be canceled , it should display the dialog box in a separate thread 如果应用程序想要显示可被取消的进度对话框，它应在单独的线程中显示该对话框。
If the progress dialog box is created in the same thread , the dialog box and the cancel button will be very sluggish to user input 如果在同一个线程中创建进度对话框，对话框（和取消按钮）对用户输入的反应将非常迟缓。
